| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * Copyright (c) 2000, 2013, 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. |
| */ |
| |
| // -- This file was mechanically generated: Do not edit! -- // |
| |
| package java.nio; |
| |
| import libcore.io.Memory; |
| |
| /** |
| * A byte buffer. |
| * |
| * <p> This class defines six categories of operations upon |
| * byte buffers: |
| * |
| * <ul> |
| * |
| * <li><p> Absolute and relative {@link #get() <i>get</i>} and |
| * {@link #put(byte) <i>put</i>} methods that read and write |
| * single bytes; </p></li> |
| * |
| * <li><p> Relative {@link #get(byte[]) <i>bulk get</i>} |
| * methods that transfer contiguous sequences of bytes from this buffer |
| * into an array; </p></li> |
| * |
| * <li><p> Relative {@link #put(byte[]) <i>bulk put</i>} |
| * methods that transfer contiguous sequences of bytes from a |
| * byte array or some other byte |
| * buffer into this buffer; </p></li> |
| * |
| * |
| * <li><p> Absolute and relative {@link #getChar() <i>get</i>} |
| * and {@link #putChar(char) <i>put</i>} methods that read and |
| * write values of other primitive types, translating them to and from |
| * sequences of bytes in a particular byte order; </p></li> |
| * |
| * <li><p> Methods for creating <i><a href="#views">view buffers</a></i>, |
| * which allow a byte buffer to be viewed as a buffer containing values of |
| * some other primitive type; and </p></li> |
| * |
| * |
| * <li><p> Methods for {@link #compact compacting}, {@link |
| * #duplicate duplicating}, and {@link #slice slicing} |
| * a byte buffer. </p></li> |
| * |
| * </ul> |
| * |
| * <p> Byte buffers can be created either by {@link #allocate |
| * <i>allocation</i>}, which allocates space for the buffer's |
| * |
| * |
| * content, or by {@link #wrap(byte[]) <i>wrapping</i>} an |
| * existing byte array into a buffer. |
| * |
| * |
| * |
| * <a name="direct"></a> |
| * <h2> Direct <i>vs.</i> non-direct buffers </h2> |
| * |
| * <p> A byte buffer is either <i>direct</i> or <i>non-direct</i>. Given a |
| * direct byte buffer, the Java virtual machine will make a best effort to |
| * perform native I/O operations directly upon it. That is, it will attempt to |
| * avoid copying the buffer's content to (or from) an intermediate buffer |
| * before (or after) each invocation of one of the underlying operating |
| * system's native I/O operations. |
| * |
| * <p> A direct byte buffer may be created by invoking the {@link |
| * #allocateDirect(int) allocateDirect} factory method of this class. The |
| * buffers returned by this method typically have somewhat higher allocation |
| * and deallocation costs than non-direct buffers. The contents of direct |
| * buffers may reside outside of the normal garbage-collected heap, and so |
| * their impact upon the memory footprint of an application might not be |
| * obvious. It is therefore recommended that direct buffers be allocated |
| * primarily for large, long-lived buffers that are subject to the underlying |
| * system's native I/O operations. In general it is best to allocate direct |
| * buffers only when they yield a measureable gain in program performance. |
| * |
| * <p> A direct byte buffer may also be created by {@link |
| * java.nio.channels.FileChannel#map mapping} a region of a file |
| * directly into memory. An implementation of the Java platform may optionally |
| * support the creation of direct byte buffers from native code via JNI. If an |
| * instance of one of these kinds of buffers refers to an inaccessible region |
| * of memory then an attempt to access that region will not change the buffer's |
| * content and will cause an unspecified exception to be thrown either at the |
| * time of the access or at some later time. |
| * |
| * <p> Whether a byte buffer is direct or non-direct may be determined by |
| * invoking its {@link #isDirect isDirect} method. This method is provided so |
| * that explicit buffer management can be done in performance-critical code. |
| * |
| * |
| * <a name="bin"></a> |
| * <h2> Access to binary data </h2> |
| * |
| * <p> This class defines methods for reading and writing values of all other |
| * primitive types, except <tt>boolean</tt>. Primitive values are translated |
| * to (or from) sequences of bytes according to the buffer's current byte |
| * order, which may be retrieved and modified via the {@link #order order} |
| * methods. Specific byte orders are represented by instances of the {@link |
| * ByteOrder} class. The initial order of a byte buffer is always {@link |
| * ByteOrder#BIG_ENDIAN BIG_ENDIAN}. |
| * |
| * <p> For access to heterogeneous binary data, that is, sequences of values of |
| * different types, this class defines a family of absolute and relative |
| * <i>get</i> and <i>put</i> methods for each type. For 32-bit floating-point |
| * values, for example, this class defines: |
| * |
| * <blockquote><pre> |
| * float {@link #getFloat()} |
| * float {@link #getFloat(int) getFloat(int index)} |
| * void {@link #putFloat(float) putFloat(float f)} |
| * void {@link #putFloat(int,float) putFloat(int index, float f)}</pre></blockquote> |
| * |
| * <p> Corresponding methods are defined for the types <tt>char</tt>, |
| * <tt>short</tt>, <tt>int</tt>, <tt>long</tt>, and <tt>double</tt>. The index |
| * parameters of the absolute <i>get</i> and <i>put</i> methods are in terms of |
| * bytes rather than of the type being read or written. |
| * |
| * <a name="views"></a> |
| * |
| * <p> For access to homogeneous binary data, that is, sequences of values of |
| * the same type, this class defines methods that can create <i>views</i> of a |
| * given byte buffer. A <i>view buffer</i> is simply another buffer whose |
| * content is backed by the byte buffer. Changes to the byte buffer's content |
| * will be visible in the view buffer, and vice versa; the two buffers' |
| * position, limit, and mark values are independent. The {@link |
| * #asFloatBuffer() asFloatBuffer} method, for example, creates an instance of |
| * the {@link FloatBuffer} class that is backed by the byte buffer upon which |
| * the method is invoked. Corresponding view-creation methods are defined for |
| * the types <tt>char</tt>, <tt>short</tt>, <tt>int</tt>, <tt>long</tt>, and |
| * <tt>double</tt>. |
| * |
| * <p> View buffers have three important advantages over the families of |
| * type-specific <i>get</i> and <i>put</i> methods described above: |
| * |
| * <ul> |
| * |
| * <li><p> A view buffer is indexed not in terms of bytes but rather in terms |
| * of the type-specific size of its values; </p></li> |
| * |
| * <li><p> A view buffer provides relative bulk <i>get</i> and <i>put</i> |
| * methods that can transfer contiguous sequences of values between a buffer |
| * and an array or some other buffer of the same type; and </p></li> |
| * |
| * <li><p> A view buffer is potentially much more efficient because it will |
| * be direct if, and only if, its backing byte buffer is direct. </p></li> |
| * |
| * </ul> |
| * |
| * <p> The byte order of a view buffer is fixed to be that of its byte buffer |
| * at the time that the view is created. </p> |
| * |
| * |
| * |
| * |
| * <h2> Invocation chaining </h2> |
| * |
| * <p> Methods in this class that do not otherwise have a value to return are |
| * specified to return the buffer upon which they are invoked. This allows |
| * method invocations to be chained. |
| * |
| * |
| * The sequence of statements |
| * |
| * <blockquote><pre> |
| * bb.putInt(0xCAFEBABE); |
| * bb.putShort(3); |
| * bb.putShort(45);</pre></blockquote> |
| * |
| * can, for example, be replaced by the single statement |
| * |
| * <blockquote><pre> |
| * bb.putInt(0xCAFEBABE).putShort(3).putShort(45);</pre></blockquote> |
| * |
| * |
| * |
| * @author Mark Reinhold |
| * @author JSR-51 Expert Group |
| * @since 1.4 |
| */ |
| |
| public abstract class ByteBuffer |
| extends Buffer |
| implements Comparable<ByteBuffer> |
| { |
| |
| // These fields are declared here rather than in Heap-X-Buffer in order to |
| // reduce the number of virtual method invocations needed to access these |
| // values, which is especially costly when coding small buffers. |
| // |
| final byte[] hb; // Non-null only for heap buffers |
| final int offset; |
| boolean isReadOnly; // Valid only for heap buffers |
| |
| // Creates a new buffer with the given mark, position, limit, capacity, |
| // backing array, and array offset |
| // |
| ByteBuffer(int mark, int pos, int lim, int cap, // package-private |
| byte[] hb, int offset) |
| { |
| super(mark, pos, lim, cap, 0); |
| this.hb = hb; |
| this.offset = offset; |
| } |
| |
| // Creates a new buffer with the given mark, position, limit, and capacity |
| // |
| ByteBuffer(int mark, int pos, int lim, int cap) { // package-private |
| this(mark, pos, lim, cap, null, 0); |
| } |
| |
| |
| /** |
| * Allocates a new direct byte buffer. |
| * |
| * <p> The new buffer's position will be zero, its limit will be its |
| * capacity, its mark will be undefined, and each of its elements will be |
| * initialized to zero. Whether or not it has a |
| * {@link #hasArray backing array} is unspecified. |
| * |
| * @param capacity |
| * The new buffer's capacity, in bytes |
| * |
| * @return The new byte buffer |
| * |
| * @throws IllegalArgumentException |
| * If the <tt>capacity</tt> is a negative integer |
| */ |
| public static ByteBuffer allocateDirect(int capacity) { |
| if (capacity < 0) { |
| throw new IllegalArgumentException("capacity < 0: " + capacity); |
| } |
| |
| DirectByteBuffer.MemoryRef memoryRef = new DirectByteBuffer.MemoryRef(capacity); |
| return new DirectByteBuffer(capacity, memoryRef); |
| } |
| |
| |
| /** |
| * Allocates a new byte buffer. |
| * |
| * <p> The new buffer's position will be zero, its limit will be its |
| * capacity, its mark will be undefined, and each of its elements will be |
| * initialized to zero. It will have a {@link #array backing array}, |
| * and its {@link #arrayOffset array offset} will be zero. |
| * |
| * @param capacity |
| * The new buffer's capacity, in bytes |
| * |
| * @return The new byte buffer |
| * |
| * @throws IllegalArgumentException |
| * If the <tt>capacity</tt> is a negative integer |
| */ |
| public static ByteBuffer allocate(int capacity) { |
| if (capacity < 0) |
| throw new IllegalArgumentException(); |
| return new HeapByteBuffer(capacity, capacity); |
| } |
| |
| /** |
| * Wraps a byte array into a buffer. |
| * |
| * <p> The new buffer will be backed by the given byte array; |
| * that is, modifications to the buffer will cause the array to be modified |
| * and vice versa. The new buffer's capacity will be |
| * <tt>array.length</tt>, its position will be <tt>offset</tt>, its limit |
| * will be <tt>offset + length</tt>, and its mark will be undefined. Its |
| * {@link #array backing array} will be the given array, and |
| * its {@link #arrayOffset array offset} will be zero. </p> |
| * |
| * @param array |
| * The array that will back the new buffer |
| * |
| * @param offset |
| * The offset of the subarray to be used; must be non-negative and |
| * no larger than <tt>array.length</tt>. The new buffer's position |
| * will be set to this value. |
| * |
| * @param length |
| * The length of the subarray to be used; |
| * must be non-negative and no larger than |
| * <tt>array.length - offset</tt>. |
| * The new buffer's limit will be set to <tt>offset + length</tt>. |
| * |
| * @return The new byte buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If the preconditions on the <tt>offset</tt> and <tt>length</tt> |
| * parameters do not hold |
| */ |
| public static ByteBuffer wrap(byte[] array, |
| int offset, int length) |
| { |
| try { |
| return new HeapByteBuffer(array, offset, length); |
| } catch (IllegalArgumentException x) { |
| throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| /** |
| * Wraps a byte array into a buffer. |
| * |
| * <p> The new buffer will be backed by the given byte array; |
| * that is, modifications to the buffer will cause the array to be modified |
| * and vice versa. The new buffer's capacity and limit will be |
| * <tt>array.length</tt>, its position will be zero, and its mark will be |
| * undefined. Its {@link #array backing array} will be the |
| * given array, and its {@link #arrayOffset array offset>} will |
| * be zero. </p> |
| * |
| * @param array |
| * The array that will back this buffer |
| * |
| * @return The new byte buffer |
| */ |
| public static ByteBuffer wrap(byte[] array) { |
| return wrap(array, 0, array.length); |
| } |
| |
| |
| /** |
| * Creates a new byte buffer whose content is a shared subsequence of |
| * this buffer's content. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of bytes remaining in this buffer, and its mark |
| * will be undefined. The new buffer will be direct if, and only if, this |
| * buffer is direct, and it will be read-only if, and only if, this buffer |
| * is read-only. </p> |
| * |
| * @return The new byte buffer |
| */ |
| public abstract ByteBuffer slice(); |
| |
| /** |
| * Creates a new byte buffer that shares this buffer's content. |
| * |
| * <p> The content of the new buffer will be that of this buffer. Changes |
| * to this buffer's content will be visible in the new buffer, and vice |
| * versa; the two buffers' position, limit, and mark values will be |
| * independent. |
| * |
| * <p> The new buffer's capacity, limit, position, and mark values will be |
| * identical to those of this buffer. The new buffer will be direct if, |
| * and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return The new byte buffer |
| */ |
| public abstract ByteBuffer duplicate(); |
| |
| /** |
| * Creates a new, read-only byte buffer that shares this buffer's |
| * content. |
| * |
| * <p> The content of the new buffer will be that of this buffer. Changes |
| * to this buffer's content will be visible in the new buffer; the new |
| * buffer itself, however, will be read-only and will not allow the shared |
| * content to be modified. The two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's capacity, limit, position, and mark values will be |
| * identical to those of this buffer. |
| * |
| * <p> If this buffer is itself read-only then this method behaves in |
| * exactly the same way as the {@link #duplicate duplicate} method. </p> |
| * |
| * @return The new, read-only byte buffer |
| */ |
| public abstract ByteBuffer asReadOnlyBuffer(); |
| |
| |
| // -- Singleton get/put methods -- |
| |
| /** |
| * Relative <i>get</i> method. Reads the byte at this buffer's |
| * current position, and then increments the position. |
| * |
| * @return The byte at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If the buffer's current position is not smaller than its limit |
| */ |
| public abstract byte get(); |
| |
| /** |
| * Relative <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> Writes the given byte into this buffer at the current |
| * position, and then increments the position. </p> |
| * |
| * @param b |
| * The byte to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If this buffer's current position is not smaller than its limit |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer put(byte b); |
| |
| /** |
| * Absolute <i>get</i> method. Reads the byte at the given |
| * index. |
| * |
| * @param index |
| * The index from which the byte will be read |
| * |
| * @return The byte at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit |
| */ |
| public abstract byte get(int index); |
| |
| /** |
| * Absolute <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> Writes the given byte into this buffer at the given |
| * index. </p> |
| * |
| * @param index |
| * The index at which the byte will be written |
| * |
| * @param b |
| * The byte value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer put(int index, byte b); |
| |
| |
| // -- Bulk get operations -- |
| |
| /** |
| * Relative bulk <i>get</i> method. |
| * |
| * <p> This method transfers bytes from this buffer into the given |
| * destination array. If there are fewer bytes remaining in the |
| * buffer than are required to satisfy the request, that is, if |
| * <tt>length</tt> <tt>></tt> <tt>remaining()</tt>, then no |
| * bytes are transferred and a {@link BufferUnderflowException} is |
| * thrown. |
| * |
| * <p> Otherwise, this method copies <tt>length</tt> bytes from this |
| * buffer into the given array, starting at the current position of this |
| * buffer and at the given offset in the array. The position of this |
| * buffer is then incremented by <tt>length</tt>. |
| * |
| * <p> In other words, an invocation of this method of the form |
| * <tt>src.get(dst, off, len)</tt> has exactly the same effect as |
| * the loop |
| * |
| * <pre>{@code |
| * for (int i = off; i < off + len; i++) |
| * dst[i] = src.get(); |
| * }</pre> |
| * |
| * except that it first checks that there are sufficient bytes in |
| * this buffer and it is potentially much more efficient. |
| * |
| * @param dst |
| * The array into which bytes are to be written |
| * |
| * @param offset |
| * The offset within the array of the first byte to be |
| * written; must be non-negative and no larger than |
| * <tt>dst.length</tt> |
| * |
| * @param length |
| * The maximum number of bytes to be written to the given |
| * array; must be non-negative and no larger than |
| * <tt>dst.length - offset</tt> |
| * |
| * @return This buffer |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than <tt>length</tt> bytes |
| * remaining in this buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If the preconditions on the <tt>offset</tt> and <tt>length</tt> |
| * parameters do not hold |
| */ |
| public ByteBuffer get(byte[] dst, int offset, int length) { |
| checkBounds(offset, length, dst.length); |
| if (length > remaining()) |
| throw new BufferUnderflowException(); |
| int end = offset + length; |
| for (int i = offset; i < end; i++) |
| dst[i] = get(); |
| return this; |
| } |
| |
| /** |
| * Relative bulk <i>get</i> method. |
| * |
| * <p> This method transfers bytes from this buffer into the given |
| * destination array. An invocation of this method of the form |
| * <tt>src.get(a)</tt> behaves in exactly the same way as the invocation |
| * |
| * <pre> |
| * src.get(a, 0, a.length) </pre> |
| * |
| * @param dst |
| * The destination array |
| * |
| * @return This buffer |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than <tt>length</tt> bytes |
| * remaining in this buffer |
| */ |
| public ByteBuffer get(byte[] dst) { |
| return get(dst, 0, dst.length); |
| } |
| |
| |
| // -- Bulk put operations -- |
| |
| /** |
| * Relative bulk <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> This method transfers the bytes remaining in the given source |
| * buffer into this buffer. If there are more bytes remaining in the |
| * source buffer than in this buffer, that is, if |
| * <tt>src.remaining()</tt> <tt>></tt> <tt>remaining()</tt>, |
| * then no bytes are transferred and a {@link |
| * BufferOverflowException} is thrown. |
| * |
| * <p> Otherwise, this method copies |
| * <i>n</i> = <tt>src.remaining()</tt> bytes from the given |
| * buffer into this buffer, starting at each buffer's current position. |
| * The positions of both buffers are then incremented by <i>n</i>. |
| * |
| * <p> In other words, an invocation of this method of the form |
| * <tt>dst.put(src)</tt> has exactly the same effect as the loop |
| * |
| * <pre> |
| * while (src.hasRemaining()) |
| * dst.put(src.get()); </pre> |
| * |
| * except that it first checks that there is sufficient space in this |
| * buffer and it is potentially much more efficient. |
| * |
| * @param src |
| * The source buffer from which bytes are to be read; |
| * must not be this buffer |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there is insufficient space in this buffer |
| * for the remaining bytes in the source buffer |
| * |
| * @throws IllegalArgumentException |
| * If the source buffer is this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public ByteBuffer put(ByteBuffer src) { |
| if (!isAccessible()) { |
| throw new IllegalStateException("buffer is inaccessible"); |
| } |
| if (src == this) { |
| throw new IllegalArgumentException(); |
| } |
| if (isReadOnly) { |
| throw new ReadOnlyBufferException(); |
| } |
| int n = src.remaining(); |
| if (n > remaining()) { |
| throw new BufferOverflowException(); |
| } |
| |
| // Note that we use offset instead of arrayOffset because arrayOffset is specified to |
| // throw for read only buffers. Our use of arrayOffset here is provably safe, we only |
| // use it to read *from* readOnly buffers. |
| if (this.hb != null && src.hb != null) { |
| // System.arraycopy is intrinsified by art and therefore tiny bit faster than memmove |
| System.arraycopy(src.hb, src.position() + src.offset, hb, position() + offset, n); |
| } else { |
| // Use the buffer object (and the raw memory address) if it's a direct buffer. Note that |
| // isDirect() doesn't imply !hasArray(), ByteBuffer.allocateDirect allocated buffer will |
| // have a backing, non-gc-movable byte array. JNI allocated direct byte buffers WILL NOT |
| // have a backing array. |
| final Object srcObject = src.isDirect() ? src : src.hb; |
| int srcOffset = src.position(); |
| if (!src.isDirect()) { |
| srcOffset += src.offset; |
| } |
| |
| final ByteBuffer dst = this; |
| final Object dstObject = dst.isDirect() ? dst : dst.hb; |
| int dstOffset = dst.position(); |
| if (!dst.isDirect()) { |
| dstOffset += dst.offset; |
| } |
| Memory.memmove(dstObject, dstOffset, srcObject, srcOffset, n); |
| } |
| src.position(src.limit()); |
| this.position(this.position() + n); |
| return this; |
| } |
| |
| /** |
| * Relative bulk <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> This method transfers bytes into this buffer from the given |
| * source array. If there are more bytes to be copied from the array |
| * than remain in this buffer, that is, if |
| * <tt>length</tt> <tt>></tt> <tt>remaining()</tt>, then no |
| * bytes are transferred and a {@link BufferOverflowException} is |
| * thrown. |
| * |
| * <p> Otherwise, this method copies <tt>length</tt> bytes from the |
| * given array into this buffer, starting at the given offset in the array |
| * and at the current position of this buffer. The position of this buffer |
| * is then incremented by <tt>length</tt>. |
| * |
| * <p> In other words, an invocation of this method of the form |
| * <tt>dst.put(src, off, len)</tt> has exactly the same effect as |
| * the loop |
| * |
| * <pre>{@code |
| * for (int i = off; i < off + len; i++) |
| * dst.put(a[i]); |
| * }</pre> |
| * |
| * except that it first checks that there is sufficient space in this |
| * buffer and it is potentially much more efficient. |
| * |
| * @param src |
| * The array from which bytes are to be read |
| * |
| * @param offset |
| * The offset within the array of the first byte to be read; |
| * must be non-negative and no larger than <tt>array.length</tt> |
| * |
| * @param length |
| * The number of bytes to be read from the given array; |
| * must be non-negative and no larger than |
| * <tt>array.length - offset</tt> |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there is insufficient space in this buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If the preconditions on the <tt>offset</tt> and <tt>length</tt> |
| * parameters do not hold |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public ByteBuffer put(byte[] src, int offset, int length) { |
| checkBounds(offset, length, src.length); |
| if (length > remaining()) |
| throw new BufferOverflowException(); |
| int end = offset + length; |
| for (int i = offset; i < end; i++) |
| this.put(src[i]); |
| return this; |
| } |
| |
| /** |
| * Relative bulk <i>put</i> method <i>(optional operation)</i>. |
| * |
| * <p> This method transfers the entire content of the given source |
| * byte array into this buffer. An invocation of this method of the |
| * form <tt>dst.put(a)</tt> behaves in exactly the same way as the |
| * invocation |
| * |
| * <pre> |
| * dst.put(a, 0, a.length) </pre> |
| * |
| * @param src |
| * The source array |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there is insufficient space in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public final ByteBuffer put(byte[] src) { |
| return put(src, 0, src.length); |
| } |
| |
| |
| // -- Other stuff -- |
| |
| /** |
| * Tells whether or not this buffer is backed by an accessible byte |
| * array. |
| * |
| * <p> If this method returns <tt>true</tt> then the {@link #array() array} |
| * and {@link #arrayOffset() arrayOffset} methods may safely be invoked. |
| * </p> |
| * |
| * @return <tt>true</tt> if, and only if, this buffer |
| * is backed by an array and is not read-only |
| */ |
| public final boolean hasArray() { |
| return (hb != null) && !isReadOnly; |
| } |
| |
| /** |
| * Returns the byte array that backs this |
| * buffer <i>(optional operation)</i>. |
| * |
| * <p> Modifications to this buffer's content will cause the returned |
| * array's content to be modified, and vice versa. |
| * |
| * <p> Invoke the {@link #hasArray hasArray} method before invoking this |
| * method in order to ensure that this buffer has an accessible backing |
| * array. </p> |
| * |
| * @return The array that backs this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is backed by an array but is read-only |
| * |
| * @throws UnsupportedOperationException |
| * If this buffer is not backed by an accessible array |
| */ |
| public final byte[] array() { |
| if (hb == null) |
| throw new UnsupportedOperationException(); |
| if (isReadOnly) |
| throw new ReadOnlyBufferException(); |
| return hb; |
| } |
| |
| /** |
| * Returns the offset within this buffer's backing array of the first |
| * element of the buffer <i>(optional operation)</i>. |
| * |
| * <p> If this buffer is backed by an array then buffer position <i>p</i> |
| * corresponds to array index <i>p</i> + <tt>arrayOffset()</tt>. |
| * |
| * <p> Invoke the {@link #hasArray hasArray} method before invoking this |
| * method in order to ensure that this buffer has an accessible backing |
| * array. </p> |
| * |
| * @return The offset within this buffer's array |
| * of the first element of the buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is backed by an array but is read-only |
| * |
| * @throws UnsupportedOperationException |
| * If this buffer is not backed by an accessible array |
| */ |
| public final int arrayOffset() { |
| if (hb == null) |
| throw new UnsupportedOperationException(); |
| if (isReadOnly) |
| throw new ReadOnlyBufferException(); |
| return offset; |
| } |
| |
| /** |
| * Compacts this buffer <i>(optional operation)</i>. |
| * |
| * <p> The bytes between the buffer's current position and its limit, |
| * if any, are copied to the beginning of the buffer. That is, the |
| * byte at index <i>p</i> = <tt>position()</tt> is copied |
| * to index zero, the byte at index <i>p</i> + 1 is copied |
| * to index one, and so forth until the byte at index |
| * <tt>limit()</tt> - 1 is copied to index |
| * <i>n</i> = <tt>limit()</tt> - <tt>1</tt> - <i>p</i>. |
| * The buffer's position is then set to <i>n+1</i> and its limit is set to |
| * its capacity. The mark, if defined, is discarded. |
| * |
| * <p> The buffer's position is set to the number of bytes copied, |
| * rather than to zero, so that an invocation of this method can be |
| * followed immediately by an invocation of another relative <i>put</i> |
| * method. </p> |
| * |
| |
| * |
| * <p> Invoke this method after writing data from a buffer in case the |
| * write was incomplete. The following loop, for example, copies bytes |
| * from one channel to another via the buffer <tt>buf</tt>: |
| * |
| * <blockquote><pre>{@code |
| * buf.clear(); // Prepare buffer for use |
| * while (in.read(buf) >= 0 || buf.position != 0) { |
| * buf.flip(); |
| * out.write(buf); |
| * buf.compact(); // In case of partial write |
| * } |
| * }</pre></blockquote> |
| * |
| |
| * |
| * @return This buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer compact(); |
| |
| /** |
| * Tells whether or not this byte buffer is direct. |
| * |
| * @return <tt>true</tt> if, and only if, this buffer is direct |
| */ |
| public abstract boolean isDirect(); |
| |
| |
| /** |
| * Returns a string summarizing the state of this buffer. |
| * |
| * @return A summary string |
| */ |
| public String toString() { |
| StringBuffer sb = new StringBuffer(); |
| sb.append(getClass().getName()); |
| sb.append("[pos="); |
| sb.append(position()); |
| sb.append(" lim="); |
| sb.append(limit()); |
| sb.append(" cap="); |
| sb.append(capacity()); |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| |
| /** |
| * Returns the current hash code of this buffer. |
| * |
| * <p> The hash code of a byte buffer depends only upon its remaining |
| * elements; that is, upon the elements from <tt>position()</tt> up to, and |
| * including, the element at <tt>limit()</tt> - <tt>1</tt>. |
| * |
| * <p> Because buffer hash codes are content-dependent, it is inadvisable |
| * to use buffers as keys in hash maps or similar data structures unless it |
| * is known that their contents will not change. </p> |
| * |
| * @return The current hash code of this buffer |
| */ |
| public int hashCode() { |
| int h = 1; |
| int p = position(); |
| for (int i = limit() - 1; i >= p; i--) |
| h = 31 * h + (int)get(i); |
| return h; |
| } |
| |
| /** |
| * Tells whether or not this buffer is equal to another object. |
| * |
| * <p> Two byte buffers are equal if, and only if, |
| * |
| * <ol> |
| * |
| * <li><p> They have the same element type, </p></li> |
| * |
| * <li><p> They have the same number of remaining elements, and |
| * </p></li> |
| * |
| * <li><p> The two sequences of remaining elements, considered |
| * independently of their starting positions, are pointwise equal. |
| |
| * </p></li> |
| * |
| * </ol> |
| * |
| * <p> A byte buffer is not equal to any other type of object. </p> |
| * |
| * @param ob The object to which this buffer is to be compared |
| * |
| * @return <tt>true</tt> if, and only if, this buffer is equal to the |
| * given object |
| */ |
| public boolean equals(Object ob) { |
| if (this == ob) |
| return true; |
| if (!(ob instanceof ByteBuffer)) |
| return false; |
| ByteBuffer that = (ByteBuffer)ob; |
| if (this.remaining() != that.remaining()) |
| return false; |
| int p = this.position(); |
| for (int i = this.limit() - 1, j = that.limit() - 1; i >= p; i--, j--) |
| if (!equals(this.get(i), that.get(j))) |
| return false; |
| return true; |
| } |
| |
| private static boolean equals(byte x, byte y) { |
| |
| |
| return x == y; |
| |
| } |
| |
| /** |
| * Compares this buffer to another. |
| * |
| * <p> Two byte buffers are compared by comparing their sequences of |
| * remaining elements lexicographically, without regard to the starting |
| * position of each sequence within its corresponding buffer. |
| * |
| * |
| * |
| * |
| * |
| * |
| * |
| * |
| * Pairs of {@code byte} elements are compared as if by invoking |
| * {@link Byte#compare(byte,byte)}. |
| |
| * |
| * <p> A byte buffer is not comparable to any other type of object. |
| * |
| * @return A negative integer, zero, or a positive integer as this buffer |
| * is less than, equal to, or greater than the given buffer |
| */ |
| public int compareTo(ByteBuffer that) { |
| int n = this.position() + Math.min(this.remaining(), that.remaining()); |
| for (int i = this.position(), j = that.position(); i < n; i++, j++) { |
| int cmp = compare(this.get(i), that.get(j)); |
| if (cmp != 0) |
| return cmp; |
| } |
| return this.remaining() - that.remaining(); |
| } |
| |
| private static int compare(byte x, byte y) { |
| |
| |
| return Byte.compare(x, y); |
| |
| } |
| |
| // -- Other char stuff -- |
| |
| |
| // -- Other byte stuff: Access to binary data -- |
| |
| |
| boolean bigEndian // package-private |
| = true; |
| boolean nativeByteOrder // package-private |
| = (Bits.byteOrder() == ByteOrder.BIG_ENDIAN); |
| |
| /** |
| * Retrieves this buffer's byte order. |
| * |
| * <p> The byte order is used when reading or writing multibyte values, and |
| * when creating buffers that are views of this byte buffer. The order of |
| * a newly-created byte buffer is always {@link ByteOrder#BIG_ENDIAN |
| * BIG_ENDIAN}. </p> |
| * |
| * @return This buffer's byte order |
| */ |
| public final ByteOrder order() { |
| return bigEndian ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN; |
| } |
| |
| /** |
| * Modifies this buffer's byte order. |
| * |
| * @param bo |
| * The new byte order, |
| * either {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN} |
| * or {@link ByteOrder#LITTLE_ENDIAN LITTLE_ENDIAN} |
| * |
| * @return This buffer |
| */ |
| public final ByteBuffer order(ByteOrder bo) { |
| bigEndian = (bo == ByteOrder.BIG_ENDIAN); |
| nativeByteOrder = |
| (bigEndian == (Bits.byteOrder() == ByteOrder.BIG_ENDIAN)); |
| return this; |
| } |
| |
| // Unchecked accessors, for use by ByteBufferAs-X-Buffer classes |
| // |
| abstract byte _get(int i); // package-private |
| abstract void _put(int i, byte b); // package-private |
| |
| |
| /** |
| * Relative <i>get</i> method for reading a char value. |
| * |
| * <p> Reads the next two bytes at this buffer's current position, |
| * composing them into a char value according to the current byte order, |
| * and then increments the position by two. </p> |
| * |
| * @return The char value at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than two bytes |
| * remaining in this buffer |
| */ |
| public abstract char getChar(); |
| |
| /** |
| * Relative <i>put</i> method for writing a char |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes two bytes containing the given char value, in the |
| * current byte order, into this buffer at the current position, and then |
| * increments the position by two. </p> |
| * |
| * @param value |
| * The char value to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there are fewer than two bytes |
| * remaining in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putChar(char value); |
| |
| /** |
| * Absolute <i>get</i> method for reading a char value. |
| * |
| * <p> Reads two bytes at the given index, composing them into a |
| * char value according to the current byte order. </p> |
| * |
| * @param index |
| * The index from which the bytes will be read |
| * |
| * @return The char value at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus one |
| */ |
| public abstract char getChar(int index); |
| |
| char getCharUnchecked(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void getUnchecked(int pos, char[] dst, int dstOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Absolute <i>put</i> method for writing a char |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes two bytes containing the given char value, in the |
| * current byte order, into this buffer at the given index. </p> |
| * |
| * @param index |
| * The index at which the bytes will be written |
| * |
| * @param value |
| * The char value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus one |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putChar(int index, char value); |
| |
| void putCharUnchecked(int index, char value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void putUnchecked(int pos, char[] dst, int srcOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Creates a view of this byte buffer as a char buffer. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of bytes remaining in this buffer divided by |
| * two, and its mark will be undefined. The new buffer will be direct |
| * if, and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return A new char buffer |
| */ |
| public abstract CharBuffer asCharBuffer(); |
| |
| |
| /** |
| * Relative <i>get</i> method for reading a short value. |
| * |
| * <p> Reads the next two bytes at this buffer's current position, |
| * composing them into a short value according to the current byte order, |
| * and then increments the position by two. </p> |
| * |
| * @return The short value at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than two bytes |
| * remaining in this buffer |
| */ |
| public abstract short getShort(); |
| |
| /** |
| * Relative <i>put</i> method for writing a short |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes two bytes containing the given short value, in the |
| * current byte order, into this buffer at the current position, and then |
| * increments the position by two. </p> |
| * |
| * @param value |
| * The short value to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there are fewer than two bytes |
| * remaining in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putShort(short value); |
| |
| /** |
| * Absolute <i>get</i> method for reading a short value. |
| * |
| * <p> Reads two bytes at the given index, composing them into a |
| * short value according to the current byte order. </p> |
| * |
| * @param index |
| * The index from which the bytes will be read |
| * |
| * @return The short value at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus one |
| */ |
| public abstract short getShort(int index); |
| |
| short getShortUnchecked(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void getUnchecked(int pos, short[] dst, int dstOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Absolute <i>put</i> method for writing a short |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes two bytes containing the given short value, in the |
| * current byte order, into this buffer at the given index. </p> |
| * |
| * @param index |
| * The index at which the bytes will be written |
| * |
| * @param value |
| * The short value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus one |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putShort(int index, short value); |
| |
| void putShortUnchecked(int index, short value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void putUnchecked(int pos, short[] dst, int srcOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Creates a view of this byte buffer as a short buffer. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of bytes remaining in this buffer divided by |
| * two, and its mark will be undefined. The new buffer will be direct |
| * if, and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return A new short buffer |
| */ |
| public abstract ShortBuffer asShortBuffer(); |
| |
| |
| /** |
| * Relative <i>get</i> method for reading an int value. |
| * |
| * <p> Reads the next four bytes at this buffer's current position, |
| * composing them into an int value according to the current byte order, |
| * and then increments the position by four. </p> |
| * |
| * @return The int value at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than four bytes |
| * remaining in this buffer |
| */ |
| public abstract int getInt(); |
| |
| /** |
| * Relative <i>put</i> method for writing an int |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes four bytes containing the given int value, in the |
| * current byte order, into this buffer at the current position, and then |
| * increments the position by four. </p> |
| * |
| * @param value |
| * The int value to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there are fewer than four bytes |
| * remaining in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putInt(int value); |
| |
| /** |
| * Absolute <i>get</i> method for reading an int value. |
| * |
| * <p> Reads four bytes at the given index, composing them into a |
| * int value according to the current byte order. </p> |
| * |
| * @param index |
| * The index from which the bytes will be read |
| * |
| * @return The int value at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus three |
| */ |
| public abstract int getInt(int index); |
| |
| int getIntUnchecked(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void getUnchecked(int pos, int[] dst, int dstOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Absolute <i>put</i> method for writing an int |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes four bytes containing the given int value, in the |
| * current byte order, into this buffer at the given index. </p> |
| * |
| * @param index |
| * The index at which the bytes will be written |
| * |
| * @param value |
| * The int value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus three |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putInt(int index, int value); |
| |
| void putIntUnchecked(int index, int value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void putUnchecked(int pos, int[] dst, int srcOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Creates a view of this byte buffer as an int buffer. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of bytes remaining in this buffer divided by |
| * four, and its mark will be undefined. The new buffer will be direct |
| * if, and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return A new int buffer |
| */ |
| public abstract IntBuffer asIntBuffer(); |
| |
| |
| /** |
| * Relative <i>get</i> method for reading a long value. |
| * |
| * <p> Reads the next eight bytes at this buffer's current position, |
| * composing them into a long value according to the current byte order, |
| * and then increments the position by eight. </p> |
| * |
| * @return The long value at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than eight bytes |
| * remaining in this buffer |
| */ |
| public abstract long getLong(); |
| |
| /** |
| * Relative <i>put</i> method for writing a long |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes eight bytes containing the given long value, in the |
| * current byte order, into this buffer at the current position, and then |
| * increments the position by eight. </p> |
| * |
| * @param value |
| * The long value to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there are fewer than eight bytes |
| * remaining in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putLong(long value); |
| |
| /** |
| * Absolute <i>get</i> method for reading a long value. |
| * |
| * <p> Reads eight bytes at the given index, composing them into a |
| * long value according to the current byte order. </p> |
| * |
| * @param index |
| * The index from which the bytes will be read |
| * |
| * @return The long value at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus seven |
| */ |
| public abstract long getLong(int index); |
| |
| long getLongUnchecked(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void getUnchecked(int pos, long[] dst, int dstOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Absolute <i>put</i> method for writing a long |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes eight bytes containing the given long value, in the |
| * current byte order, into this buffer at the given index. </p> |
| * |
| * @param index |
| * The index at which the bytes will be written |
| * |
| * @param value |
| * The long value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus seven |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putLong(int index, long value); |
| |
| void putLongUnchecked(int index, long value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void putUnchecked(int pos, long[] dst, int srcOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Creates a view of this byte buffer as a long buffer. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of bytes remaining in this buffer divided by |
| * eight, and its mark will be undefined. The new buffer will be direct |
| * if, and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return A new long buffer |
| */ |
| public abstract LongBuffer asLongBuffer(); |
| |
| |
| /** |
| * Relative <i>get</i> method for reading a float value. |
| * |
| * <p> Reads the next four bytes at this buffer's current position, |
| * composing them into a float value according to the current byte order, |
| * and then increments the position by four. </p> |
| * |
| * @return The float value at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than four bytes |
| * remaining in this buffer |
| */ |
| public abstract float getFloat(); |
| |
| /** |
| * Relative <i>put</i> method for writing a float |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes four bytes containing the given float value, in the |
| * current byte order, into this buffer at the current position, and then |
| * increments the position by four. </p> |
| * |
| * @param value |
| * The float value to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there are fewer than four bytes |
| * remaining in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putFloat(float value); |
| |
| /** |
| * Absolute <i>get</i> method for reading a float value. |
| * |
| * <p> Reads four bytes at the given index, composing them into a |
| * float value according to the current byte order. </p> |
| * |
| * @param index |
| * The index from which the bytes will be read |
| * |
| * @return The float value at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus three |
| */ |
| public abstract float getFloat(int index); |
| |
| float getFloatUnchecked(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void getUnchecked(int pos, float[] dst, int dstOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Absolute <i>put</i> method for writing a float |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes four bytes containing the given float value, in the |
| * current byte order, into this buffer at the given index. </p> |
| * |
| * @param index |
| * The index at which the bytes will be written |
| * |
| * @param value |
| * The float value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus three |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putFloat(int index, float value); |
| |
| void putFloatUnchecked(int index, float value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void putUnchecked(int pos, float[] dst, int srcOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Creates a view of this byte buffer as a float buffer. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of bytes remaining in this buffer divided by |
| * four, and its mark will be undefined. The new buffer will be direct |
| * if, and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return A new float buffer |
| */ |
| public abstract FloatBuffer asFloatBuffer(); |
| |
| |
| /** |
| * Relative <i>get</i> method for reading a double value. |
| * |
| * <p> Reads the next eight bytes at this buffer's current position, |
| * composing them into a double value according to the current byte order, |
| * and then increments the position by eight. </p> |
| * |
| * @return The double value at the buffer's current position |
| * |
| * @throws BufferUnderflowException |
| * If there are fewer than eight bytes |
| * remaining in this buffer |
| */ |
| public abstract double getDouble(); |
| |
| /** |
| * Relative <i>put</i> method for writing a double |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes eight bytes containing the given double value, in the |
| * current byte order, into this buffer at the current position, and then |
| * increments the position by eight. </p> |
| * |
| * @param value |
| * The double value to be written |
| * |
| * @return This buffer |
| * |
| * @throws BufferOverflowException |
| * If there are fewer than eight bytes |
| * remaining in this buffer |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putDouble(double value); |
| |
| /** |
| * Absolute <i>get</i> method for reading a double value. |
| * |
| * <p> Reads eight bytes at the given index, composing them into a |
| * double value according to the current byte order. </p> |
| * |
| * @param index |
| * The index from which the bytes will be read |
| * |
| * @return The double value at the given index |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus seven |
| */ |
| public abstract double getDouble(int index); |
| |
| double getDoubleUnchecked(int index) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void getUnchecked(int pos, double[] dst, int dstOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Absolute <i>put</i> method for writing a double |
| * value <i>(optional operation)</i>. |
| * |
| * <p> Writes eight bytes containing the given double value, in the |
| * current byte order, into this buffer at the given index. </p> |
| * |
| * @param index |
| * The index at which the bytes will be written |
| * |
| * @param value |
| * The double value to be written |
| * |
| * @return This buffer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>index</tt> is negative |
| * or not smaller than the buffer's limit, |
| * minus seven |
| * |
| * @throws ReadOnlyBufferException |
| * If this buffer is read-only |
| */ |
| public abstract ByteBuffer putDouble(int index, double value); |
| |
| void putDoubleUnchecked(int index, double value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| void putUnchecked(int pos, double[] dst, int srcOffset, int length) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Creates a view of this byte buffer as a double buffer. |
| * |
| * <p> The content of the new buffer will start at this buffer's current |
| * position. Changes to this buffer's content will be visible in the new |
| * buffer, and vice versa; the two buffers' position, limit, and mark |
| * values will be independent. |
| * |
| * <p> The new buffer's position will be zero, its capacity and its limit |
| * will be the number of bytes remaining in this buffer divided by |
| * eight, and its mark will be undefined. The new buffer will be direct |
| * if, and only if, this buffer is direct, and it will be read-only if, and |
| * only if, this buffer is read-only. </p> |
| * |
| * @return A new double buffer |
| */ |
| public abstract DoubleBuffer asDoubleBuffer(); |
| |
| /** |
| * @hide |
| */ |
| public boolean isAccessible() { |
| return true; |
| } |
| |
| /** |
| * @hide |
| */ |
| public void setAccessible(boolean value) { |
| throw new UnsupportedOperationException(); |
| } |
| } |
