| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * Copyright (c) 1995, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.lang; |
| |
| import dalvik.annotation.optimization.FastNative; |
| import java.io.*; |
| import java.math.BigInteger; |
| import java.util.ArrayList; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import java.util.stream.Collectors; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.StringTokenizer; |
| |
| import dalvik.system.BlockGuard; |
| import sun.reflect.CallerSensitive; |
| import java.lang.ref.FinalizerReference; |
| import java.util.ArrayList; |
| import java.util.List; |
| import dalvik.system.DelegateLastClassLoader; |
| import dalvik.system.PathClassLoader; |
| import dalvik.system.VMDebug; |
| import dalvik.system.VMRuntime; |
| import sun.reflect.Reflection; |
| |
| import libcore.io.IoUtils; |
| import libcore.io.Libcore; |
| import libcore.util.EmptyArray; |
| import static android.system.OsConstants._SC_NPROCESSORS_CONF; |
| |
| /** |
| * Every Java application has a single instance of class |
| * {@code Runtime} that allows the application to interface with |
| * the environment in which the application is running. The current |
| * runtime can be obtained from the {@code getRuntime} method. |
| * <p> |
| * An application cannot create its own instance of this class. |
| * |
| * @author unascribed |
| * @see java.lang.Runtime#getRuntime() |
| * @since 1.0 |
| */ |
| |
| public class Runtime { |
| private static final Runtime currentRuntime = new Runtime(); |
| |
| // Android-removed: Remove unsupported Version field. |
| // private static Version version; |
| |
| /** |
| * Holds the list of threads to run when the VM terminates |
| */ |
| private List<Thread> shutdownHooks = new ArrayList<Thread>(); |
| |
| /** |
| * Reflects whether finalization should be run for all objects |
| * when the VM terminates. |
| */ |
| private static boolean finalizeOnExit; |
| |
| /** |
| * Reflects whether we are already shutting down the VM. |
| */ |
| private boolean shuttingDown; |
| |
| private static native void nativeExit(int code); |
| |
| /** |
| * Returns the runtime object associated with the current Java application. |
| * Most of the methods of class {@code Runtime} are instance |
| * methods and must be invoked with respect to the current runtime object. |
| * |
| * @return the {@code Runtime} object associated with the current |
| * Java application. |
| */ |
| public static Runtime getRuntime() { |
| return currentRuntime; |
| } |
| |
| /** Don't let anyone else instantiate this class */ |
| private Runtime() {} |
| |
| /** |
| * Terminates the currently running Java virtual machine by initiating its |
| * shutdown sequence. This method never returns normally. The argument |
| * serves as a status code; by convention, a nonzero status code indicates |
| * abnormal termination. |
| * |
| * <p> All registered {@linkplain #addShutdownHook shutdown hooks}, if any, |
| * are started in some unspecified order and allowed to run concurrently |
| * until they finish. Once this is done the virtual machine |
| * {@linkplain #halt halts}. |
| * |
| * <p> If this method is invoked after all shutdown hooks have already |
| * been run and the status is nonzero then this method halts the |
| * virtual machine with the given status code. Otherwise, this method |
| * blocks indefinitely. |
| * |
| * <p> The {@link System#exit(int) System.exit} method is the |
| * conventional and convenient means of invoking this method. |
| * |
| * @param status |
| * Termination status. By convention, a nonzero status code |
| * indicates abnormal termination. |
| * |
| * @throws SecurityException |
| * If a security manager is present and its |
| * {@link SecurityManager#checkExit checkExit} method does not permit |
| * exiting with the specified status |
| * |
| * @see java.lang.SecurityException |
| * @see java.lang.SecurityManager#checkExit(int) |
| * @see #addShutdownHook |
| * @see #removeShutdownHook |
| * @see #halt(int) |
| */ |
| public void exit(int status) { |
| // Make sure we don't try this several times |
| synchronized(this) { |
| if (!shuttingDown) { |
| shuttingDown = true; |
| |
| Thread[] hooks; |
| synchronized (shutdownHooks) { |
| // create a copy of the hooks |
| hooks = new Thread[shutdownHooks.size()]; |
| shutdownHooks.toArray(hooks); |
| } |
| |
| // Start all shutdown hooks concurrently |
| for (Thread hook : hooks) { |
| hook.start(); |
| } |
| |
| // Wait for all shutdown hooks to finish |
| for (Thread hook : hooks) { |
| try { |
| hook.join(); |
| } catch (InterruptedException ex) { |
| // Ignore, since we are at VM shutdown. |
| } |
| } |
| |
| // Ensure finalization on exit, if requested |
| if (finalizeOnExit) { |
| runFinalization(); |
| } |
| |
| // Get out of here finally... |
| nativeExit(status); |
| } |
| } |
| } |
| |
| /** |
| * Registers a new virtual-machine shutdown hook. |
| * |
| * <p> The Java virtual machine <i>shuts down</i> in response to two kinds |
| * of events: |
| * |
| * <ul> |
| * |
| * <li> The program <i>exits</i> normally, when the last non-daemon |
| * thread exits or when the {@link #exit exit} (equivalently, |
| * {@link System#exit(int) System.exit}) method is invoked, or |
| * |
| * <li> The virtual machine is <i>terminated</i> in response to a |
| * user interrupt, such as typing {@code ^C}, or a system-wide event, |
| * such as user logoff or system shutdown. |
| * |
| * </ul> |
| * |
| * <p> A <i>shutdown hook</i> is simply an initialized but unstarted |
| * thread. When the virtual machine begins its shutdown sequence it will |
| * start all registered shutdown hooks in some unspecified order and let |
| * them run concurrently. When all the hooks have finished it will then |
| * halt. Note that daemon threads will continue to run during the shutdown |
| * sequence, as will non-daemon threads if shutdown was initiated by |
| * invoking the {@link #exit exit} method. |
| * |
| * <p> Once the shutdown sequence has begun it can be stopped only by |
| * invoking the {@link #halt halt} method, which forcibly |
| * terminates the virtual machine. |
| * |
| * <p> Once the shutdown sequence has begun it is impossible to register a |
| * new shutdown hook or de-register a previously-registered hook. |
| * Attempting either of these operations will cause an |
| * {@link IllegalStateException} to be thrown. |
| * |
| * <p> Shutdown hooks run at a delicate time in the life cycle of a virtual |
| * machine and should therefore be coded defensively. They should, in |
| * particular, be written to be thread-safe and to avoid deadlocks insofar |
| * as possible. They should also not rely blindly upon services that may |
| * have registered their own shutdown hooks and therefore may themselves in |
| * the process of shutting down. Attempts to use other thread-based |
| * services such as the AWT event-dispatch thread, for example, may lead to |
| * deadlocks. |
| * |
| * <p> Shutdown hooks should also finish their work quickly. When a |
| * program invokes {@link #exit exit} the expectation is |
| * that the virtual machine will promptly shut down and exit. When the |
| * virtual machine is terminated due to user logoff or system shutdown the |
| * underlying operating system may only allow a fixed amount of time in |
| * which to shut down and exit. It is therefore inadvisable to attempt any |
| * user interaction or to perform a long-running computation in a shutdown |
| * hook. |
| * |
| * <p> Uncaught exceptions are handled in shutdown hooks just as in any |
| * other thread, by invoking the |
| * {@link ThreadGroup#uncaughtException uncaughtException} method of the |
| * thread's {@link ThreadGroup} object. The default implementation of this |
| * method prints the exception's stack trace to {@link System#err} and |
| * terminates the thread; it does not cause the virtual machine to exit or |
| * halt. |
| * |
| * <p> In rare circumstances the virtual machine may <i>abort</i>, that is, |
| * stop running without shutting down cleanly. This occurs when the |
| * virtual machine is terminated externally, for example with the |
| * {@code SIGKILL} signal on Unix or the {@code TerminateProcess} call on |
| * Microsoft Windows. The virtual machine may also abort if a native |
| * method goes awry by, for example, corrupting internal data structures or |
| * attempting to access nonexistent memory. If the virtual machine aborts |
| * then no guarantee can be made about whether or not any shutdown hooks |
| * will be run. |
| * |
| * @param hook |
| * An initialized but unstarted {@link Thread} object |
| * |
| * @throws IllegalArgumentException |
| * If the specified hook has already been registered, |
| * or if it can be determined that the hook is already running or |
| * has already been run |
| * |
| * @throws IllegalStateException |
| * If the virtual machine is already in the process |
| * of shutting down |
| * |
| * @throws SecurityException |
| * If a security manager is present and it denies |
| * {@link RuntimePermission}("shutdownHooks") |
| * |
| * @see #removeShutdownHook |
| * @see #halt(int) |
| * @see #exit(int) |
| * @since 1.3 |
| */ |
| public void addShutdownHook(Thread hook) { |
| // Sanity checks |
| if (hook == null) { |
| throw new NullPointerException("hook == null"); |
| } |
| |
| if (shuttingDown) { |
| throw new IllegalStateException("VM already shutting down"); |
| } |
| |
| if (hook.started) { |
| throw new IllegalArgumentException("Hook has already been started"); |
| } |
| |
| synchronized (shutdownHooks) { |
| if (shutdownHooks.contains(hook)) { |
| throw new IllegalArgumentException("Hook already registered."); |
| } |
| |
| shutdownHooks.add(hook); |
| } |
| } |
| |
| /** |
| * De-registers a previously-registered virtual-machine shutdown hook. |
| * |
| * @param hook the hook to remove |
| * @return {@code true} if the specified hook had previously been |
| * registered and was successfully de-registered, {@code false} |
| * otherwise. |
| * |
| * @throws IllegalStateException |
| * If the virtual machine is already in the process of shutting |
| * down |
| * |
| * @throws SecurityException |
| * If a security manager is present and it denies |
| * {@link RuntimePermission}("shutdownHooks") |
| * |
| * @see #addShutdownHook |
| * @see #exit(int) |
| * @since 1.3 |
| */ |
| public boolean removeShutdownHook(Thread hook) { |
| // Sanity checks |
| if (hook == null) { |
| throw new NullPointerException("hook == null"); |
| } |
| |
| if (shuttingDown) { |
| throw new IllegalStateException("VM already shutting down"); |
| } |
| |
| synchronized (shutdownHooks) { |
| return shutdownHooks.remove(hook); |
| } |
| } |
| |
| /** |
| * Forcibly terminates the currently running Java virtual machine. This |
| * method never returns normally. |
| * |
| * <p> This method should be used with extreme caution. Unlike the |
| * {@link #exit exit} method, this method does not cause shutdown |
| * hooks to be started. If the shutdown sequence has already been |
| * initiated then this method does not wait for any running |
| * shutdown hooks to finish their work. |
| * |
| * @param status |
| * Termination status. By convention, a nonzero status code |
| * indicates abnormal termination. If the {@link Runtime#exit exit} |
| * (equivalently, {@link System#exit(int) System.exit}) method |
| * has already been invoked then this status code |
| * will override the status code passed to that method. |
| * |
| * @throws SecurityException |
| * If a security manager is present and its |
| * {@link SecurityManager#checkExit checkExit} method |
| * does not permit an exit with the specified status |
| * |
| * @see #exit |
| * @see #addShutdownHook |
| * @see #removeShutdownHook |
| * @since 1.3 |
| */ |
| public void halt(int status) { |
| // Android-changed: Implement halt(int) in ART. |
| /* |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkExit(status); |
| } |
| Shutdown.beforeHalt(); |
| Shutdown.halt(status); |
| } |
| */ |
| nativeExit(status); |
| } |
| |
| /** |
| * Enable or disable finalization on exit; doing so specifies that the |
| * finalizers of all objects that have finalizers that have not yet been |
| * automatically invoked are to be run before the Java runtime exits. |
| * By default, finalization on exit is disabled. |
| * |
| * <p>If there is a security manager, |
| * its <code>checkExit</code> method is first called |
| * with 0 as its argument to ensure the exit is allowed. |
| * This could result in a SecurityException. |
| * |
| * @param value true to enable finalization on exit, false to disable |
| * @deprecated This method is inherently unsafe. It may result in |
| * finalizers being called on live objects while other threads are |
| * concurrently manipulating those objects, resulting in erratic |
| * behavior or deadlock. |
| * |
| * @throws SecurityException |
| * if a security manager exists and its <code>checkExit</code> |
| * method doesn't allow the exit. |
| * |
| * @see java.lang.Runtime#exit(int) |
| * @see java.lang.Runtime#gc() |
| * @see java.lang.SecurityManager#checkExit(int) |
| * @since JDK1.1 |
| */ |
| @Deprecated |
| public static void runFinalizersOnExit(boolean value) { |
| finalizeOnExit = value; |
| } |
| |
| /** |
| * Executes the specified string command in a separate process. |
| * |
| * <p>This is a convenience method. An invocation of the form |
| * {@code exec(command)} |
| * behaves in exactly the same way as the invocation |
| * {@link #exec(String, String[], File) exec}{@code (command, null, null)}. |
| * |
| * @param command a specified system command. |
| * |
| * @return A new {@link Process} object for managing the subprocess |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * {@link SecurityManager#checkExec checkExec} |
| * method doesn't allow creation of the subprocess |
| * |
| * @throws IOException |
| * If an I/O error occurs |
| * |
| * @throws NullPointerException |
| * If {@code command} is {@code null} |
| * |
| * @throws IllegalArgumentException |
| * If {@code command} is empty |
| * |
| * @see #exec(String[], String[], File) |
| * @see ProcessBuilder |
| */ |
| public Process exec(String command) throws IOException { |
| return exec(command, null, null); |
| } |
| |
| /** |
| * Executes the specified string command in a separate process with the |
| * specified environment. |
| * |
| * <p>This is a convenience method. An invocation of the form |
| * {@code exec(command, envp)} |
| * behaves in exactly the same way as the invocation |
| * {@link #exec(String, String[], File) exec}{@code (command, envp, null)}. |
| * |
| * @param command a specified system command. |
| * |
| * @param envp array of strings, each element of which |
| * has environment variable settings in the format |
| * <i>name</i>=<i>value</i>, or |
| * {@code null} if the subprocess should inherit |
| * the environment of the current process. |
| * |
| * @return A new {@link Process} object for managing the subprocess |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * {@link SecurityManager#checkExec checkExec} |
| * method doesn't allow creation of the subprocess |
| * |
| * @throws IOException |
| * If an I/O error occurs |
| * |
| * @throws NullPointerException |
| * If {@code command} is {@code null}, |
| * or one of the elements of {@code envp} is {@code null} |
| * |
| * @throws IllegalArgumentException |
| * If {@code command} is empty |
| * |
| * @see #exec(String[], String[], File) |
| * @see ProcessBuilder |
| */ |
| public Process exec(String command, String[] envp) throws IOException { |
| return exec(command, envp, null); |
| } |
| |
| /** |
| * Executes the specified string command in a separate process with the |
| * specified environment and working directory. |
| * |
| * <p>This is a convenience method. An invocation of the form |
| * {@code exec(command, envp, dir)} |
| * behaves in exactly the same way as the invocation |
| * {@link #exec(String[], String[], File) exec}{@code (cmdarray, envp, dir)}, |
| * where {@code cmdarray} is an array of all the tokens in |
| * {@code command}. |
| * |
| * <p>More precisely, the {@code command} string is broken |
| * into tokens using a {@link StringTokenizer} created by the call |
| * {@code new {@link StringTokenizer}(command)} with no |
| * further modification of the character categories. The tokens |
| * produced by the tokenizer are then placed in the new string |
| * array {@code cmdarray}, in the same order. |
| * |
| * @param command a specified system command. |
| * |
| * @param envp array of strings, each element of which |
| * has environment variable settings in the format |
| * <i>name</i>=<i>value</i>, or |
| * {@code null} if the subprocess should inherit |
| * the environment of the current process. |
| * |
| * @param dir the working directory of the subprocess, or |
| * {@code null} if the subprocess should inherit |
| * the working directory of the current process. |
| * |
| * @return A new {@link Process} object for managing the subprocess |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * {@link SecurityManager#checkExec checkExec} |
| * method doesn't allow creation of the subprocess |
| * |
| * @throws IOException |
| * If an I/O error occurs |
| * |
| * @throws NullPointerException |
| * If {@code command} is {@code null}, |
| * or one of the elements of {@code envp} is {@code null} |
| * |
| * @throws IllegalArgumentException |
| * If {@code command} is empty |
| * |
| * @see ProcessBuilder |
| * @since 1.3 |
| */ |
| public Process exec(String command, String[] envp, File dir) |
| throws IOException { |
| if (command.length() == 0) |
| throw new IllegalArgumentException("Empty command"); |
| |
| StringTokenizer st = new StringTokenizer(command); |
| String[] cmdarray = new String[st.countTokens()]; |
| for (int i = 0; st.hasMoreTokens(); i++) |
| cmdarray[i] = st.nextToken(); |
| return exec(cmdarray, envp, dir); |
| } |
| |
| /** |
| * Executes the specified command and arguments in a separate process. |
| * |
| * <p>This is a convenience method. An invocation of the form |
| * {@code exec(cmdarray)} |
| * behaves in exactly the same way as the invocation |
| * {@link #exec(String[], String[], File) exec}{@code (cmdarray, null, null)}. |
| * |
| * @param cmdarray array containing the command to call and |
| * its arguments. |
| * |
| * @return A new {@link Process} object for managing the subprocess |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * {@link SecurityManager#checkExec checkExec} |
| * method doesn't allow creation of the subprocess |
| * |
| * @throws IOException |
| * If an I/O error occurs |
| * |
| * @throws NullPointerException |
| * If {@code cmdarray} is {@code null}, |
| * or one of the elements of {@code cmdarray} is {@code null} |
| * |
| * @throws IndexOutOfBoundsException |
| * If {@code cmdarray} is an empty array |
| * (has length {@code 0}) |
| * |
| * @see ProcessBuilder |
| */ |
| public Process exec(String cmdarray[]) throws IOException { |
| return exec(cmdarray, null, null); |
| } |
| |
| /** |
| * Executes the specified command and arguments in a separate process |
| * with the specified environment. |
| * |
| * <p>This is a convenience method. An invocation of the form |
| * {@code exec(cmdarray, envp)} |
| * behaves in exactly the same way as the invocation |
| * {@link #exec(String[], String[], File) exec}{@code (cmdarray, envp, null)}. |
| * |
| * @param cmdarray array containing the command to call and |
| * its arguments. |
| * |
| * @param envp array of strings, each element of which |
| * has environment variable settings in the format |
| * <i>name</i>=<i>value</i>, or |
| * {@code null} if the subprocess should inherit |
| * the environment of the current process. |
| * |
| * @return A new {@link Process} object for managing the subprocess |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * {@link SecurityManager#checkExec checkExec} |
| * method doesn't allow creation of the subprocess |
| * |
| * @throws IOException |
| * If an I/O error occurs |
| * |
| * @throws NullPointerException |
| * If {@code cmdarray} is {@code null}, |
| * or one of the elements of {@code cmdarray} is {@code null}, |
| * or one of the elements of {@code envp} is {@code null} |
| * |
| * @throws IndexOutOfBoundsException |
| * If {@code cmdarray} is an empty array |
| * (has length {@code 0}) |
| * |
| * @see ProcessBuilder |
| */ |
| public Process exec(String[] cmdarray, String[] envp) throws IOException { |
| return exec(cmdarray, envp, null); |
| } |
| |
| |
| /** |
| * Executes the specified command and arguments in a separate process with |
| * the specified environment and working directory. |
| * |
| * <p>Given an array of strings {@code cmdarray}, representing the |
| * tokens of a command line, and an array of strings {@code envp}, |
| * representing "environment" variable settings, this method creates |
| * a new process in which to execute the specified command. |
| * |
| * <p>This method checks that {@code cmdarray} is a valid operating |
| * system command. Which commands are valid is system-dependent, |
| * but at the very least the command must be a non-empty list of |
| * non-null strings. |
| * |
| * <p>If {@code envp} is {@code null}, the subprocess inherits the |
| * environment settings of the current process. |
| * |
| * <p>A minimal set of system dependent environment variables may |
| * be required to start a process on some operating systems. |
| * As a result, the subprocess may inherit additional environment variable |
| * settings beyond those in the specified environment. |
| * |
| * <p>{@link ProcessBuilder#start()} is now the preferred way to |
| * start a process with a modified environment. |
| * |
| * <p>The working directory of the new subprocess is specified by {@code dir}. |
| * If {@code dir} is {@code null}, the subprocess inherits the |
| * current working directory of the current process. |
| * |
| * <p>If a security manager exists, its |
| * {@link SecurityManager#checkExec checkExec} |
| * method is invoked with the first component of the array |
| * {@code cmdarray} as its argument. This may result in a |
| * {@link SecurityException} being thrown. |
| * |
| * <p>Starting an operating system process is highly system-dependent. |
| * Among the many things that can go wrong are: |
| * <ul> |
| * <li>The operating system program file was not found. |
| * <li>Access to the program file was denied. |
| * <li>The working directory does not exist. |
| * </ul> |
| * |
| * <p>In such cases an exception will be thrown. The exact nature |
| * of the exception is system-dependent, but it will always be a |
| * subclass of {@link IOException}. |
| * |
| * <p>If the operating system does not support the creation of |
| * processes, an {@link UnsupportedOperationException} will be thrown. |
| * |
| * |
| * @param cmdarray array containing the command to call and |
| * its arguments. |
| * |
| * @param envp array of strings, each element of which |
| * has environment variable settings in the format |
| * <i>name</i>=<i>value</i>, or |
| * {@code null} if the subprocess should inherit |
| * the environment of the current process. |
| * |
| * @param dir the working directory of the subprocess, or |
| * {@code null} if the subprocess should inherit |
| * the working directory of the current process. |
| * |
| * @return A new {@link Process} object for managing the subprocess |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * {@link SecurityManager#checkExec checkExec} |
| * method doesn't allow creation of the subprocess |
| * |
| * @throws UnsupportedOperationException |
| * If the operating system does not support the creation of processes. |
| * |
| * @throws IOException |
| * If an I/O error occurs |
| * |
| * @throws NullPointerException |
| * If {@code cmdarray} is {@code null}, |
| * or one of the elements of {@code cmdarray} is {@code null}, |
| * or one of the elements of {@code envp} is {@code null} |
| * |
| * @throws IndexOutOfBoundsException |
| * If {@code cmdarray} is an empty array |
| * (has length {@code 0}) |
| * |
| * @see ProcessBuilder |
| * @since 1.3 |
| */ |
| public Process exec(String[] cmdarray, String[] envp, File dir) |
| throws IOException { |
| return new ProcessBuilder(cmdarray) |
| .environment(envp) |
| .directory(dir) |
| .start(); |
| } |
| |
| /** |
| * Returns the number of processors available to the Java virtual machine. |
| * |
| * <p> This value may change during a particular invocation of the virtual |
| * machine. Applications that are sensitive to the number of available |
| * processors should therefore occasionally poll this property and adjust |
| * their resource usage appropriately. </p> |
| * |
| * @return the maximum number of processors available to the virtual |
| * machine; never smaller than one |
| * @since 1.4 |
| */ |
| public int availableProcessors() { |
| return (int) Libcore.os.sysconf(_SC_NPROCESSORS_CONF); |
| } |
| |
| /** |
| * Returns the amount of free memory in the Java Virtual Machine. |
| * Calling the |
| * {@code gc} method may result in increasing the value returned |
| * by {@code freeMemory.} |
| * |
| * @return an approximation to the total amount of memory currently |
| * available for future allocated objects, measured in bytes. |
| */ |
| @FastNative |
| public native long freeMemory(); |
| |
| /** |
| * Returns the total amount of memory in the Java virtual machine. |
| * The value returned by this method may vary over time, depending on |
| * the host environment. |
| * <p> |
| * Note that the amount of memory required to hold an object of any |
| * given type may be implementation-dependent. |
| * |
| * @return the total amount of memory currently available for current |
| * and future objects, measured in bytes. |
| */ |
| @FastNative |
| public native long totalMemory(); |
| |
| /** |
| * Returns the maximum amount of memory that the Java virtual machine |
| * will attempt to use. If there is no inherent limit then the value |
| * {@link java.lang.Long#MAX_VALUE} will be returned. |
| * |
| * @return the maximum amount of memory that the virtual machine will |
| * attempt to use, measured in bytes |
| * @since 1.4 |
| */ |
| @FastNative |
| public native long maxMemory(); |
| |
| /** |
| * Runs the garbage collector. |
| * Calling this method suggests that the Java virtual machine expend |
| * effort toward recycling unused objects in order to make the memory |
| * they currently occupy available for quick reuse. When control |
| * returns from the method call, the virtual machine has made |
| * its best effort to recycle all discarded objects. |
| * <p> |
| * The name {@code gc} stands for "garbage |
| * collector". The virtual machine performs this recycling |
| * process automatically as needed, in a separate thread, even if the |
| * {@code gc} method is not invoked explicitly. |
| * <p> |
| * The method {@link System#gc()} is the conventional and convenient |
| * means of invoking this method. |
| */ |
| // Android-changed: Added BlockGuard check to gc() |
| // public native void gc(); |
| public void gc() { |
| BlockGuard.getThreadPolicy().onExplicitGc(); |
| nativeGc(); |
| } |
| |
| private native void nativeGc(); |
| |
| /** |
| * Runs the finalization methods of any objects pending finalization. |
| * Calling this method suggests that the Java virtual machine expend |
| * effort toward running the {@code finalize} methods of objects |
| * that have been found to be discarded but whose {@code finalize} |
| * methods have not yet been run. When control returns from the |
| * method call, the virtual machine has made a best effort to |
| * complete all outstanding finalizations. |
| * <p> |
| * The virtual machine performs the finalization process |
| * automatically as needed, in a separate thread, if the |
| * {@code runFinalization} method is not invoked explicitly. |
| * <p> |
| * The method {@link System#runFinalization()} is the conventional |
| * and convenient means of invoking this method. |
| * |
| * @see java.lang.Object#finalize() |
| */ |
| public void runFinalization() { |
| // Android-changed: Implement finalization in ART. |
| // SharedSecrets.getJavaLangRefAccess().runFinalization(); |
| VMRuntime.runFinalization(0); |
| } |
| |
| /** |
| * Not implemented, does nothing. |
| * |
| * @deprecated |
| * This method was intended to control instruction tracing. |
| * It has been superseded by ART-specific tracing mechanisms. |
| * |
| * @param on ignored |
| */ |
| @Deprecated(since="9", forRemoval=true) |
| public void traceInstructions(boolean on) { } |
| |
| /** |
| * Not implemented, does nothing. |
| * <p> |
| * Calling this method on Android Lollipop or later (API level >= 21) |
| * with {@code true} argument will cause it to throw an |
| * {@code UnsupportedOperationException}. |
| * |
| * @deprecated |
| * This method was intended to control method call tracing. |
| * It has been superseded by ART-specific tracing mechanisms. |
| * |
| * @param on ignored |
| */ |
| @Deprecated(since="9", forRemoval=true) |
| public void traceMethodCalls(boolean on) { |
| if (on) { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| /** |
| * Loads the native library specified by the filename argument. The filename |
| * argument must be an absolute path name. |
| * (for example |
| * {@code Runtime.getRuntime().load("/home/avh/lib/libX11.so");}). |
| * |
| * If the filename argument, when stripped of any platform-specific library |
| * prefix, path, and file extension, indicates a library whose name is, |
| * for example, L, and a native library called L is statically linked |
| * with the VM, then the JNI_OnLoad_L function exported by the library |
| * is invoked rather than attempting to load a dynamic library. |
| * A filename matching the argument does not have to exist in the file |
| * system. |
| * See the <a href="{@docRoot}/../specs/jni/index.html"> JNI Specification</a> |
| * for more details. |
| * |
| * Otherwise, the filename argument is mapped to a native library image in |
| * an implementation-dependent manner. |
| * <p> |
| * First, if there is a security manager, its {@code checkLink} |
| * method is called with the {@code filename} as its argument. |
| * This may result in a security exception. |
| * <p> |
| * This is similar to the method {@link #loadLibrary(String)}, but it |
| * accepts a general file name as an argument rather than just a library |
| * name, allowing any file of native code to be loaded. |
| * <p> |
| * The method {@link System#load(String)} is the conventional and |
| * convenient means of invoking this method. |
| * |
| * @param filename the file to load. |
| * @throws SecurityException if a security manager exists and its |
| * {@code checkLink} method doesn't allow |
| * loading of the specified dynamic library |
| * @throws UnsatisfiedLinkError if either the filename is not an |
| * absolute path name, the native library is not statically |
| * linked with the VM, or the library cannot be mapped to |
| * a native library image by the host system. |
| * @throws NullPointerException if {@code filename} is |
| * {@code null} |
| * @see java.lang.Runtime#getRuntime() |
| * @see java.lang.SecurityException |
| * @see java.lang.SecurityManager#checkLink(java.lang.String) |
| */ |
| @CallerSensitive |
| public void load(String filename) { |
| load0(Reflection.getCallerClass(), filename); |
| } |
| |
| /** Check target sdk, if it's higher than N, we throw an UnsupportedOperationException */ |
| private void checkTargetSdkVersionForLoad(String methodName) { |
| final int targetSdkVersion = VMRuntime.getRuntime().getTargetSdkVersion(); |
| if (targetSdkVersion > 24) { |
| throw new UnsupportedOperationException(methodName + " is not supported on SDK " + |
| targetSdkVersion); |
| } |
| } |
| |
| // Fixes b/25859957 regression. Depending on private methods is bad, mkay. |
| void load(String absolutePath, ClassLoader loader) { |
| checkTargetSdkVersionForLoad("java.lang.Runtime#load(String, ClassLoader)"); |
| |
| java.lang.System.logE("java.lang.Runtime#load(String, ClassLoader)" + |
| " is private and will be removed in a future Android release"); |
| if (absolutePath == null) { |
| throw new NullPointerException("absolutePath == null"); |
| } |
| String error = nativeLoad(absolutePath, loader); |
| if (error != null) { |
| throw new UnsatisfiedLinkError(error); |
| } |
| } |
| |
| synchronized void load0(Class<?> fromClass, String filename) { |
| if (!(new File(filename).isAbsolute())) { |
| throw new UnsatisfiedLinkError( |
| "Expecting an absolute path of the library: " + filename); |
| } |
| if (filename == null) { |
| throw new NullPointerException("filename == null"); |
| } |
| String error = nativeLoad(filename, fromClass.getClassLoader(), fromClass); |
| if (error != null) { |
| throw new UnsatisfiedLinkError(error); |
| } |
| } |
| |
| /** |
| * Loads the native library specified by the {@code libname} |
| * argument. The {@code libname} argument must not contain any platform |
| * specific prefix, file extension or path. If a native library |
| * called {@code libname} is statically linked with the VM, then the |
| * JNI_OnLoad_{@code libname} function exported by the library is invoked. |
| * See the <a href="{@docRoot}/../specs/jni/index.html"> JNI Specification</a> |
| * for more details. |
| * |
| * Otherwise, the libname argument is loaded from a system library |
| * location and mapped to a native library image in an implementation- |
| * dependent manner. |
| * <p> |
| * First, if there is a security manager, its {@code checkLink} |
| * method is called with the {@code libname} as its argument. |
| * This may result in a security exception. |
| * <p> |
| * The method {@link System#loadLibrary(String)} is the conventional |
| * and convenient means of invoking this method. If native |
| * methods are to be used in the implementation of a class, a standard |
| * strategy is to put the native code in a library file (call it |
| * {@code LibFile}) and then to put a static initializer: |
| * <blockquote><pre> |
| * static { System.loadLibrary("LibFile"); } |
| * </pre></blockquote> |
| * within the class declaration. When the class is loaded and |
| * initialized, the necessary native code implementation for the native |
| * methods will then be loaded as well. |
| * <p> |
| * If this method is called more than once with the same library |
| * name, the second and subsequent calls are ignored. |
| * |
| * @param libname the name of the library. |
| * @throws SecurityException if a security manager exists and its |
| * {@code checkLink} method doesn't allow |
| * loading of the specified dynamic library |
| * @throws UnsatisfiedLinkError if either the libname argument |
| * contains a file path, the native library is not statically |
| * linked with the VM, or the library cannot be mapped to a |
| * native library image by the host system. |
| * @throws NullPointerException if {@code libname} is |
| * {@code null} |
| * @see java.lang.SecurityException |
| * @see java.lang.SecurityManager#checkLink(java.lang.String) |
| */ |
| @CallerSensitive |
| public void loadLibrary(String libname) { |
| loadLibrary0(Reflection.getCallerClass(), libname); |
| } |
| |
| // BEGIN Android-changed: Different implementation of loadLibrary0(Class, String). |
| /* |
| synchronized void loadLibrary0(Class<?> fromClass, String libname) { |
| SecurityManager security = System.getSecurityManager(); |
| if (security != null) { |
| security.checkLink(libname); |
| } |
| if (libname.indexOf((int)File.separatorChar) != -1) { |
| throw new UnsatisfiedLinkError( |
| "Directory separator should not appear in library name: " + libname); |
| } |
| ClassLoader.loadLibrary(fromClass, libname, false); |
| } |
| */ |
| void loadLibrary0(Class<?> fromClass, String libname) { |
| ClassLoader classLoader = ClassLoader.getClassLoader(fromClass); |
| loadLibrary0(classLoader, fromClass, libname); |
| } |
| |
| /** |
| * Temporarily preserved for backward compatibility. Applications call this |
| * method using reflection. |
| * |
| * **** THIS METHOD WILL BE REMOVED IN A FUTURE ANDROID VERSION **** |
| * |
| * http://b/26217329 |
| * |
| * @hide |
| */ |
| public void loadLibrary(String libname, ClassLoader classLoader) { |
| checkTargetSdkVersionForLoad("java.lang.Runtime#loadLibrary(String, ClassLoader)"); |
| java.lang.System.logE("java.lang.Runtime#loadLibrary(String, ClassLoader)" + |
| " is private and will be removed in a future Android release"); |
| // Pass null for callerClass, we don't know it at this point. Passing null preserved |
| // the behavior when we used to not pass the class. |
| loadLibrary0(classLoader, null, libname); |
| } |
| |
| // This overload exists for @UnsupportedAppUsage |
| void loadLibrary0(ClassLoader loader, String libname) { |
| // Pass null for callerClass, we don't know it at this point. Passing null preserved |
| // the behavior when we used to not pass the class. |
| loadLibrary0(loader, null, libname); |
| } |
| |
| /** |
| * Loads the shared library {@code libname} in the context of {@code loader} and |
| * {@code callerClass}. |
| * |
| * @param loader the class loader that initiated the loading. Used by the |
| * underlying linker to determine linker namespace. A {@code null} |
| * value represents the boot class loader. |
| * @param callerClass the class that initiated the loading. When not |
| * {@code null}, it is also used to determine the linker |
| * namespace from the class's dex file location (which is in an |
| * apk or dex jar). |
| * @param libname the name of the library. |
| */ |
| private synchronized void loadLibrary0(ClassLoader loader, Class<?> callerClass, String libname) { |
| if (libname.indexOf((int)File.separatorChar) != -1) { |
| throw new UnsatisfiedLinkError( |
| "Directory separator should not appear in library name: " + libname); |
| } |
| String libraryName = libname; |
| // Android-note: BootClassLoader doesn't implement findLibrary(). http://b/111850480 |
| // Android's class.getClassLoader() can return BootClassLoader where the RI would |
| // have returned null; therefore we treat BootClassLoader the same as null here. |
| if (loader != null && !(loader instanceof BootClassLoader)) { |
| String filename = loader.findLibrary(libraryName); |
| if (filename == null && |
| (loader.getClass() == PathClassLoader.class || |
| loader.getClass() == DelegateLastClassLoader.class)) { |
| // Don't give up even if we failed to find the library in the native lib paths. |
| // The underlying dynamic linker might be able to find the lib in one of the linker |
| // namespaces associated with the current linker namespace. In order to give the |
| // dynamic linker a chance, proceed to load the library with its soname, which |
| // is the fileName. |
| // Note that we do this only for PathClassLoader and DelegateLastClassLoader to |
| // minimize the scope of this behavioral change as much as possible, which might |
| // cause problem like b/143649498. These two class loaders are the only |
| // platform-provided class loaders that can load apps. See the classLoader attribute |
| // of the application tag in app manifest. |
| filename = System.mapLibraryName(libraryName); |
| } |
| if (filename == null) { |
| // It's not necessarily true that the ClassLoader used |
| // System.mapLibraryName, but the default setup does, and it's |
| // misleading to say we didn't find "libMyLibrary.so" when we |
| // actually searched for "liblibMyLibrary.so.so". |
| throw new UnsatisfiedLinkError(loader + " couldn't find \"" + |
| System.mapLibraryName(libraryName) + "\""); |
| } |
| String error = nativeLoad(filename, loader, callerClass); |
| if (error != null) { |
| throw new UnsatisfiedLinkError(error); |
| } |
| return; |
| } |
| |
| // We know some apps use mLibPaths directly, potentially assuming it's not null. |
| // Initialize it here to make sure apps see a non-null value. |
| getLibPaths(); |
| String filename = System.mapLibraryName(libraryName); |
| String error = nativeLoad(filename, loader, callerClass); |
| if (error != null) { |
| throw new UnsatisfiedLinkError(error); |
| } |
| } |
| |
| private volatile String[] mLibPaths = null; |
| |
| private String[] getLibPaths() { |
| if (mLibPaths == null) { |
| synchronized(this) { |
| if (mLibPaths == null) { |
| mLibPaths = initLibPaths(); |
| } |
| } |
| } |
| return mLibPaths; |
| } |
| |
| private static String[] initLibPaths() { |
| String javaLibraryPath = System.getProperty("java.library.path"); |
| if (javaLibraryPath == null) { |
| return EmptyArray.STRING; |
| } |
| String[] paths = javaLibraryPath.split(":"); |
| // Add a '/' to the end of each directory so we don't have to do it every time. |
| for (int i = 0; i < paths.length; ++i) { |
| if (!paths[i].endsWith("/")) { |
| paths[i] += "/"; |
| } |
| } |
| return paths; |
| } |
| |
| // This method is used through reflection from /art/test/150-loadlibrary. |
| private static String nativeLoad(String filename, ClassLoader loader) { |
| return nativeLoad(filename, loader, null); |
| } |
| |
| private static native String nativeLoad(String filename, ClassLoader loader, Class<?> caller); |
| // END Android-changed: Different implementation of loadLibrary0(Class, String). |
| |
| // BEGIN Android-added: Keep deprecated localized stream APIs. |
| /** |
| * Creates a localized version of an input stream. This method takes |
| * an <code>InputStream</code> and returns an <code>InputStream</code> |
| * equivalent to the argument in all respects except that it is |
| * localized: as characters in the local character set are read from |
| * the stream, they are automatically converted from the local |
| * character set to Unicode. |
| * <p> |
| * If the argument is already a localized stream, it may be returned |
| * as the result. |
| * |
| * @param in InputStream to localize |
| * @return a localized input stream |
| * @see java.io.InputStream |
| * @see java.io.BufferedReader#BufferedReader(java.io.Reader) |
| * @see java.io.InputStreamReader#InputStreamReader(java.io.InputStream) |
| * @removed As of JDK 1.1, the preferred way to translate a byte |
| * stream in the local encoding into a character stream in Unicode is via |
| * the <code>InputStreamReader</code> and <code>BufferedReader</code> |
| * classes. |
| */ |
| @Deprecated |
| public InputStream getLocalizedInputStream(InputStream in) { |
| return in; |
| } |
| |
| /** |
| * Creates a localized version of an output stream. This method |
| * takes an <code>OutputStream</code> and returns an |
| * <code>OutputStream</code> equivalent to the argument in all respects |
| * except that it is localized: as Unicode characters are written to |
| * the stream, they are automatically converted to the local |
| * character set. |
| * <p> |
| * If the argument is already a localized stream, it may be returned |
| * as the result. |
| * |
| * @removed As of JDK 1.1, the preferred way to translate a |
| * Unicode character stream into a byte stream in the local encoding is via |
| * the <code>OutputStreamWriter</code>, <code>BufferedWriter</code>, and |
| * <code>PrintWriter</code> classes. |
| * |
| * @param out OutputStream to localize |
| * @return a localized output stream |
| * @see java.io.OutputStream |
| * @see java.io.BufferedWriter#BufferedWriter(java.io.Writer) |
| * @see java.io.OutputStreamWriter#OutputStreamWriter(java.io.OutputStream) |
| * @see java.io.PrintWriter#PrintWriter(java.io.OutputStream) |
| */ |
| @Deprecated |
| public OutputStream getLocalizedOutputStream(OutputStream out) { |
| return out; |
| } |
| // END Android-added: Keep deprecated localized stream APIs. |
| |
| // BEGIN Android-removed: Remove the unsupported version() method. |
| /* |
| /** |
| * Returns the version of the Java Runtime Environment as a {@link Version}. |
| * |
| * @return the {@link Version} of the Java Runtime Environment |
| * |
| * @since 9 |
| * |
| public static Version version() { |
| if (version == null) { |
| version = new Version(VersionProps.versionNumbers(), |
| VersionProps.pre(), VersionProps.build(), |
| VersionProps.optional()); |
| } |
| return version; |
| } |
| |
| /** |
| * A representation of a version string for an implementation of the |
| * Java SE Platform. A version string consists of a version number |
| * optionally followed by pre-release and build information. |
| * |
| * <h2><a id="verNum">Version numbers</a></h2> |
| * |
| * <p> A <em>version number</em>, {@code $VNUM}, is a non-empty sequence of |
| * elements separated by period characters (U+002E). An element is either |
| * zero, or an unsigned integer numeral without leading zeros. The final |
| * element in a version number must not be zero. When an element is |
| * incremented, all subsequent elements are removed. The format is: </p> |
| * |
| * <blockquote><pre> |
| * [1-9][0-9]*((\.0)*\.[1-9][0-9]*)* |
| * </pre></blockquote> |
| * |
| * <p> The sequence may be of arbitrary length but the first four elements |
| * are assigned specific meanings, as follows:</p> |
| * |
| * <blockquote><pre> |
| * $FEATURE.$INTERIM.$UPDATE.$PATCH |
| * </pre></blockquote> |
| * |
| * <ul> |
| * |
| * <li><p> <a id="FEATURE">{@code $FEATURE}</a> — The |
| * feature-release counter, incremented for every feature release |
| * regardless of release content. Features may be added in a feature |
| * release; they may also be removed, if advance notice was given at least |
| * one feature release ahead of time. Incompatible changes may be made |
| * when justified. </p></li> |
| * |
| * <li><p> <a id="INTERIM">{@code $INTERIM}</a> — The |
| * interim-release counter, incremented for non-feature releases that |
| * contain compatible bug fixes and enhancements but no incompatible |
| * changes, no feature removals, and no changes to standard APIs. |
| * </p></li> |
| * |
| * <li><p> <a id="UPDATE">{@code $UPDATE}</a> — The update-release |
| * counter, incremented for compatible update releases that fix security |
| * issues, regressions, and bugs in newer features. </p></li> |
| * |
| * <li><p> <a id="PATCH">{@code $PATCH}</a> — The emergency |
| * patch-release counter, incremented only when it's necessary to produce |
| * an emergency release to fix a critical issue. </p></li> |
| * |
| * </ul> |
| * |
| * <p> The fifth and later elements of a version number are free for use by |
| * platform implementors, to identify implementor-specific patch |
| * releases. </p> |
| * |
| * <p> A version number never has trailing zero elements. If an element |
| * and all those that follow it logically have the value zero then all of |
| * them are omitted. </p> |
| * |
| * <p> The sequence of numerals in a version number is compared to another |
| * such sequence in numerical, pointwise fashion; <em>e.g.</em>, {@code |
| * 10.0.4} is less than {@code 10.1.2}. If one sequence is shorter than |
| * another then the missing elements of the shorter sequence are considered |
| * to be less than the corresponding elements of the longer sequence; |
| * <em>e.g.</em>, {@code 10.0.2} is less than {@code 10.0.2.1}. </p> |
| * |
| * <h2><a id="verStr">Version strings</a></h2> |
| * |
| * <p> A <em>version string</em>, {@code $VSTR}, is a version number {@code |
| * $VNUM}, as described above, optionally followed by pre-release and build |
| * information, in one of the following formats: </p> |
| * |
| * <blockquote><pre> |
| * $VNUM(-$PRE)?\+$BUILD(-$OPT)? |
| * $VNUM-$PRE(-$OPT)? |
| * $VNUM(+-$OPT)? |
| * </pre></blockquote> |
| * |
| * <p> where: </p> |
| * |
| * <ul> |
| * |
| * <li><p> <a id="pre">{@code $PRE}</a>, matching {@code ([a-zA-Z0-9]+)} |
| * — A pre-release identifier. Typically {@code ea}, for a |
| * potentially unstable early-access release under active development, or |
| * {@code internal}, for an internal developer build. </p></li> |
| * |
| * <li><p> <a id="build">{@code $BUILD}</a>, matching {@code |
| * (0|[1-9][0-9]*)} — The build number, incremented for each promoted |
| * build. {@code $BUILD} is reset to {@code 1} when any portion of {@code |
| * $VNUM} is incremented. </p></li> |
| * |
| * <li><p> <a id="opt">{@code $OPT}</a>, matching {@code ([-a-zA-Z0-9.]+)} |
| * — Additional build information, if desired. In the case of an |
| * {@code internal} build this will often contain the date and time of the |
| * build. </p></li> |
| * |
| * </ul> |
| * |
| * <p> A version string {@code 10-ea} matches {@code $VNUM = "10"} and |
| * {@code $PRE = "ea"}. The version string {@code 10+-ea} matches |
| * {@code $VNUM = "10"} and {@code $OPT = "ea"}. </p> |
| * |
| * <p> When comparing two version strings, the value of {@code $OPT}, if |
| * present, may or may not be significant depending on the chosen |
| * comparison method. The comparison methods {@link #compareTo(Version) |
| * compareTo()} and {@link #compareToIgnoreOptional(Version) |
| * compareToIgnoreOptional()} should be used consistently with the |
| * corresponding methods {@link #equals(Object) equals()} and {@link |
| * #equalsIgnoreOptional(Object) equalsIgnoreOptional()}. </p> |
| * |
| * <p> A <em>short version string</em>, {@code $SVSTR}, often useful in |
| * less formal contexts, is a version number optionally followed by a |
| * pre-release identifier:</p> |
| * |
| * <blockquote><pre> |
| * $VNUM(-$PRE)? |
| * </pre></blockquote> |
| * |
| * <p>This is a <a href="./doc-files/ValueBased.html">value-based</a> |
| * class; use of identity-sensitive operations (including reference equality |
| * ({@code ==}), identity hash code, or synchronization) on instances of |
| * {@code Version} may have unpredictable results and should be avoided. |
| * </p> |
| * |
| * @since 9 |
| *//* |
| public static final class Version |
| implements Comparable<Version> |
| { |
| private final List<Integer> version; |
| private final Optional<String> pre; |
| private final Optional<Integer> build; |
| private final Optional<String> optional; |
| |
| *//* |
| * List of version number components passed to this constructor MUST |
| * be at least unmodifiable (ideally immutable). In the case on an |
| * unmodifiable list, the caller MUST hand the list over to this |
| * constructor and never change the underlying list. |
| *//* |
| private Version(List<Integer> unmodifiableListOfVersions, |
| Optional<String> pre, |
| Optional<Integer> build, |
| Optional<String> optional) |
| { |
| this.version = unmodifiableListOfVersions; |
| this.pre = pre; |
| this.build = build; |
| this.optional = optional; |
| } |
| |
| /** |
| * Parses the given string as a valid |
| * <a href="#verStr">version string</a> containing a |
| * <a href="#verNum">version number</a> followed by pre-release and |
| * build information. |
| * |
| * @param s |
| * A string to interpret as a version |
| * |
| * @throws IllegalArgumentException |
| * If the given string cannot be interpreted as a valid |
| * version |
| * |
| * @throws NullPointerException |
| * If the given string is {@code null} |
| * |
| * @throws NumberFormatException |
| * If an element of the version number or the build number |
| * cannot be represented as an {@link Integer} |
| * |
| * @return The Version of the given string |
| *//* |
| public static Version parse(String s) { |
| if (s == null) |
| throw new NullPointerException(); |
| |
| // Shortcut to avoid initializing VersionPattern when creating |
| // feature-version constants during startup |
| if (isSimpleNumber(s)) { |
| return new Version(List.of(Integer.parseInt(s)), |
| Optional.empty(), Optional.empty(), Optional.empty()); |
| } |
| Matcher m = VersionPattern.VSTR_PATTERN.matcher(s); |
| if (!m.matches()) |
| throw new IllegalArgumentException("Invalid version string: '" |
| + s + "'"); |
| |
| // $VNUM is a dot-separated list of integers of arbitrary length |
| String[] split = m.group(VersionPattern.VNUM_GROUP).split("\\."); |
| Integer[] version = new Integer[split.length]; |
| for (int i = 0; i < split.length; i++) { |
| version[i] = Integer.parseInt(split[i]); |
| } |
| |
| Optional<String> pre = Optional.ofNullable( |
| m.group(VersionPattern.PRE_GROUP)); |
| |
| String b = m.group(VersionPattern.BUILD_GROUP); |
| // $BUILD is an integer |
| Optional<Integer> build = (b == null) |
| ? Optional.empty() |
| : Optional.of(Integer.parseInt(b)); |
| |
| Optional<String> optional = Optional.ofNullable( |
| m.group(VersionPattern.OPT_GROUP)); |
| |
| // empty '+' |
| if (!build.isPresent()) { |
| if (m.group(VersionPattern.PLUS_GROUP) != null) { |
| if (optional.isPresent()) { |
| if (pre.isPresent()) |
| throw new IllegalArgumentException("'+' found with" |
| + " pre-release and optional components:'" + s |
| + "'"); |
| } else { |
| throw new IllegalArgumentException("'+' found with neither" |
| + " build or optional components: '" + s + "'"); |
| } |
| } else { |
| if (optional.isPresent() && !pre.isPresent()) { |
| throw new IllegalArgumentException("optional component" |
| + " must be preceeded by a pre-release component" |
| + " or '+': '" + s + "'"); |
| } |
| } |
| } |
| return new Version(List.of(version), pre, build, optional); |
| } |
| |
| private static boolean isSimpleNumber(String s) { |
| for (int i = 0; i < s.length(); i++) { |
| char c = s.charAt(i); |
| char lowerBound = (i > 0) ? '0' : '1'; |
| if (c < lowerBound || c > '9') { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Returns the value of the <a href="#FEATURE">feature</a> element of |
| * the version number. |
| * |
| * @return The value of the feature element |
| * |
| * @since 10 |
| *//* |
| public int feature() { |
| return version.get(0); |
| } |
| |
| /** |
| * Returns the value of the <a href="#INTERIM">interim</a> element of |
| * the version number, or zero if it is absent. |
| * |
| * @return The value of the interim element, or zero |
| * |
| * @since 10 |
| *//* |
| public int interim() { |
| return (version.size() > 1 ? version.get(1) : 0); |
| } |
| |
| /** |
| * Returns the value of the <a href="#UPDATE">update</a> element of the |
| * version number, or zero if it is absent. |
| * |
| * @return The value of the update element, or zero |
| * |
| * @since 10 |
| *//* |
| public int update() { |
| return (version.size() > 2 ? version.get(2) : 0); |
| } |
| |
| /** |
| * Returns the value of the <a href="#PATCH">patch</a> element of the |
| * version number, or zero if it is absent. |
| * |
| * @return The value of the patch element, or zero |
| * |
| * @since 10 |
| *//* |
| public int patch() { |
| return (version.size() > 3 ? version.get(3) : 0); |
| } |
| |
| /** |
| * Returns the value of the major element of the version number. |
| * |
| * @deprecated As of Java SE 10, the first element of a version |
| * number is not the major-release number but the feature-release |
| * counter, incremented for every time-based release. Use the {@link |
| * #feature()} method in preference to this method. For compatibility, |
| * this method returns the value of the <a href="#FEATURE">feature</a> |
| * element. |
| * |
| * @return The value of the feature element |
| *//* |
| @Deprecated(since = "10") |
| public int major() { |
| return feature(); |
| } |
| |
| /** |
| * Returns the value of the minor element of the version number, or |
| * zero if it is absent. |
| * |
| * @deprecated As of Java SE 10, the second element of a version |
| * number is not the minor-release number but the interim-release |
| * counter, incremented for every interim release. Use the {@link |
| * #interim()} method in preference to this method. For compatibility, |
| * this method returns the value of the <a href="#INTERIM">interim</a> |
| * element, or zero if it is absent. |
| * |
| * @return The value of the interim element, or zero |
| *//* |
| @Deprecated(since = "10") |
| public int minor() { |
| return interim(); |
| } |
| |
| /** |
| * Returns the value of the security element of the version number, or |
| * zero if it is absent. |
| * |
| * @deprecated As of Java SE 10, the third element of a version |
| * number is not the security level but the update-release counter, |
| * incremented for every update release. Use the {@link #update()} |
| * method in preference to this method. For compatibility, this method |
| * returns the value of the <a href="#UPDATE">update</a> element, or |
| * zero if it is absent. |
| * |
| * @return The value of the update element, or zero |
| *//* |
| @Deprecated(since = "10") |
| public int security() { |
| return update(); |
| } |
| |
| /** |
| * Returns an unmodifiable {@link java.util.List List} of the integers |
| * represented in the <a href="#verNum">version number</a>. |
| * The {@code List} always contains at least one element corresponding to |
| * the <a href="#FEATURE">feature version number</a>. |
| * |
| * @return An unmodifiable list of the integers |
| * represented in the version number |
| *//* |
| public List<Integer> version() { |
| return version; |
| } |
| |
| /** |
| * Returns the optional <a href="#pre">pre-release</a> information. |
| * |
| * @return The optional pre-release information as a String |
| *//* |
| public Optional<String> pre() { |
| return pre; |
| } |
| |
| /** |
| * Returns the <a href="#build">build number</a>. |
| * |
| * @return The optional build number. |
| *//* |
| public Optional<Integer> build() { |
| return build; |
| } |
| |
| /** |
| * Returns <a href="#opt">optional</a> additional identifying build |
| * information. |
| * |
| * @return Additional build information as a String |
| *//* |
| public Optional<String> optional() { |
| return optional; |
| } |
| |
| /** |
| * Compares this version to another. |
| * |
| * <p> Each of the components in the <a href="#verStr">version</a> is |
| * compared in the following order of precedence: version numbers, |
| * pre-release identifiers, build numbers, optional build information. |
| * </p> |
| * |
| * <p> Comparison begins by examining the sequence of version numbers. |
| * If one sequence is shorter than another, then the missing elements |
| * of the shorter sequence are considered to be less than the |
| * corresponding elements of the longer sequence. </p> |
| * |
| * <p> A version with a pre-release identifier is always considered to |
| * be less than a version without one. Pre-release identifiers are |
| * compared numerically when they consist only of digits, and |
| * lexicographically otherwise. Numeric identifiers are considered to |
| * be less than non-numeric identifiers. </p> |
| * |
| * <p> A version without a build number is always less than one with a |
| * build number; otherwise build numbers are compared numerically. </p> |
| * |
| * <p> The optional build information is compared lexicographically. |
| * During this comparison, a version with optional build information is |
| * considered to be greater than a version without one. </p> |
| * |
| * @param obj |
| * The object to be compared |
| * |
| * @return A negative integer, zero, or a positive integer if this |
| * {@code Version} is less than, equal to, or greater than the |
| * given {@code Version} |
| * |
| * @throws NullPointerException |
| * If the given object is {@code null} |
| *//* |
| @Override |
| public int compareTo(Version obj) { |
| return compare(obj, false); |
| } |
| |
| /** |
| * Compares this version to another disregarding optional build |
| * information. |
| * |
| * <p> Two versions are compared by examining the version string as |
| * described in {@link #compareTo(Version)} with the exception that the |
| * optional build information is always ignored. </p> |
| * |
| * <p> This method provides ordering which is consistent with |
| * {@code equalsIgnoreOptional()}. </p> |
| * |
| * @param obj |
| * The object to be compared |
| * |
| * @return A negative integer, zero, or a positive integer if this |
| * {@code Version} is less than, equal to, or greater than the |
| * given {@code Version} |
| * |
| * @throws NullPointerException |
| * If the given object is {@code null} |
| *//* |
| public int compareToIgnoreOptional(Version obj) { |
| return compare(obj, true); |
| } |
| |
| private int compare(Version obj, boolean ignoreOpt) { |
| if (obj == null) |
| throw new NullPointerException(); |
| |
| int ret = compareVersion(obj); |
| if (ret != 0) |
| return ret; |
| |
| ret = comparePre(obj); |
| if (ret != 0) |
| return ret; |
| |
| ret = compareBuild(obj); |
| if (ret != 0) |
| return ret; |
| |
| if (!ignoreOpt) |
| return compareOptional(obj); |
| |
| return 0; |
| } |
| |
| private int compareVersion(Version obj) { |
| int size = version.size(); |
| int oSize = obj.version().size(); |
| int min = Math.min(size, oSize); |
| for (int i = 0; i < min; i++) { |
| int val = version.get(i); |
| int oVal = obj.version().get(i); |
| if (val != oVal) |
| return val - oVal; |
| } |
| return size - oSize; |
| } |
| |
| private int comparePre(Version obj) { |
| Optional<String> oPre = obj.pre(); |
| if (!pre.isPresent()) { |
| if (oPre.isPresent()) |
| return 1; |
| } else { |
| if (!oPre.isPresent()) |
| return -1; |
| String val = pre.get(); |
| String oVal = oPre.get(); |
| if (val.matches("\\d+")) { |
| return (oVal.matches("\\d+") |
| ? (new BigInteger(val)).compareTo(new BigInteger(oVal)) |
| : -1); |
| } else { |
| return (oVal.matches("\\d+") |
| ? 1 |
| : val.compareTo(oVal)); |
| } |
| } |
| return 0; |
| } |
| |
| private int compareBuild(Version obj) { |
| Optional<Integer> oBuild = obj.build(); |
| if (oBuild.isPresent()) { |
| return (build.isPresent() |
| ? build.get().compareTo(oBuild.get()) |
| : -1); |
| } else if (build.isPresent()) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| private int compareOptional(Version obj) { |
| Optional<String> oOpt = obj.optional(); |
| if (!optional.isPresent()) { |
| if (oOpt.isPresent()) |
| return -1; |
| } else { |
| if (!oOpt.isPresent()) |
| return 1; |
| return optional.get().compareTo(oOpt.get()); |
| } |
| return 0; |
| } |
| |
| /** |
| * Returns a string representation of this version. |
| * |
| * @return The version string |
| *//* |
| @Override |
| public String toString() { |
| StringBuilder sb |
| = new StringBuilder(version.stream() |
| .map(Object::toString) |
| .collect(Collectors.joining("."))); |
| |
| pre.ifPresent(v -> sb.append("-").append(v)); |
| |
| if (build.isPresent()) { |
| sb.append("+").append(build.get()); |
| if (optional.isPresent()) |
| sb.append("-").append(optional.get()); |
| } else { |
| if (optional.isPresent()) { |
| sb.append(pre.isPresent() ? "-" : "+-"); |
| sb.append(optional.get()); |
| } |
| } |
| |
| return sb.toString(); |
| } |
| |
| /** |
| * Determines whether this {@code Version} is equal to another object. |
| * |
| * <p> Two {@code Version}s are equal if and only if they represent the |
| * same version string. |
| * |
| * @param obj |
| * The object to which this {@code Version} is to be compared |
| * |
| * @return {@code true} if, and only if, the given object is a {@code |
| * Version} that is identical to this {@code Version} |
| * |
| *//* |
| @Override |
| public boolean equals(Object obj) { |
| boolean ret = equalsIgnoreOptional(obj); |
| if (!ret) |
| return false; |
| |
| Version that = (Version)obj; |
| return (this.optional().equals(that.optional())); |
| } |
| |
| /** |
| * Determines whether this {@code Version} is equal to another |
| * disregarding optional build information. |
| * |
| * <p> Two {@code Version}s are equal if and only if they represent the |
| * same version string disregarding the optional build information. |
| * |
| * @param obj |
| * The object to which this {@code Version} is to be compared |
| * |
| * @return {@code true} if, and only if, the given object is a {@code |
| * Version} that is identical to this {@code Version} |
| * ignoring the optional build information |
| * |
| *//* |
| public boolean equalsIgnoreOptional(Object obj) { |
| if (this == obj) |
| return true; |
| if (!(obj instanceof Version)) |
| return false; |
| |
| Version that = (Version)obj; |
| return (this.version().equals(that.version()) |
| && this.pre().equals(that.pre()) |
| && this.build().equals(that.build())); |
| } |
| |
| /** |
| * Returns the hash code of this version. |
| * |
| * @return The hashcode of this version |
| *//* |
| @Override |
| public int hashCode() { |
| int h = 1; |
| int p = 17; |
| |
| h = p * h + version.hashCode(); |
| h = p * h + pre.hashCode(); |
| h = p * h + build.hashCode(); |
| h = p * h + optional.hashCode(); |
| |
| return h; |
| } |
| } |
| |
| private static class VersionPattern { |
| // $VNUM(-$PRE)?(\+($BUILD)?(\-$OPT)?)? |
| // RE limits the format of version strings |
| // ([1-9][0-9]*(?:(?:\.0)*\.[1-9][0-9]*)*)(?:-([a-zA-Z0-9]+))?(?:(\+)(0|[1-9][0-9]*)?)?(?:-([-a-zA-Z0-9.]+))? |
| |
| private static final String VNUM |
| = "(?<VNUM>[1-9][0-9]*(?:(?:\\.0)*\\.[1-9][0-9]*)*)"; |
| private static final String PRE = "(?:-(?<PRE>[a-zA-Z0-9]+))?"; |
| private static final String BUILD |
| = "(?:(?<PLUS>\\+)(?<BUILD>0|[1-9][0-9]*)?)?"; |
| private static final String OPT = "(?:-(?<OPT>[-a-zA-Z0-9.]+))?"; |
| private static final String VSTR_FORMAT = VNUM + PRE + BUILD + OPT; |
| |
| static final Pattern VSTR_PATTERN = Pattern.compile(VSTR_FORMAT); |
| |
| static final String VNUM_GROUP = "VNUM"; |
| static final String PRE_GROUP = "PRE"; |
| static final String PLUS_GROUP = "PLUS"; |
| static final String BUILD_GROUP = "BUILD"; |
| static final String OPT_GROUP = "OPT"; |
| } |
| */ |
| // END Android-removed: Remove the unsupported version() method. |
| } |
