Automatic sources dropoff on 2020-06-10 18:32:38.095721
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Change-Id: I24cbf6ba6db262a1ae1445db1427a08fee35b3b4
diff --git a/java/util/EnumSet.java b/java/util/EnumSet.java
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ * Copyright (c) 2003, 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.
+ */
+
+package java.util;
+
+/**
+ * A specialized {@link Set} implementation for use with enum types. All of
+ * the elements in an enum set must come from a single enum type that is
+ * specified, explicitly or implicitly, when the set is created. Enum sets
+ * are represented internally as bit vectors. This representation is
+ * extremely compact and efficient. The space and time performance of this
+ * class should be good enough to allow its use as a high-quality, typesafe
+ * alternative to traditional <tt>int</tt>-based "bit flags." Even bulk
+ * operations (such as <tt>containsAll</tt> and <tt>retainAll</tt>) should
+ * run very quickly if their argument is also an enum set.
+ *
+ * <p>The iterator returned by the <tt>iterator</tt> method traverses the
+ * elements in their <i>natural order</i> (the order in which the enum
+ * constants are declared). The returned iterator is <i>weakly
+ * consistent</i>: it will never throw {@link ConcurrentModificationException}
+ * and it may or may not show the effects of any modifications to the set that
+ * occur while the iteration is in progress.
+ *
+ * <p>Null elements are not permitted. Attempts to insert a null element
+ * will throw {@link NullPointerException}. Attempts to test for the
+ * presence of a null element or to remove one will, however, function
+ * properly.
+ *
+ * <P>Like most collection implementations, <tt>EnumSet</tt> is not
+ * synchronized. If multiple threads access an enum set concurrently, and at
+ * least one of the threads modifies the set, it should be synchronized
+ * externally. This is typically accomplished by synchronizing on some
+ * object that naturally encapsulates the enum set. If no such object exists,
+ * the set should be "wrapped" using the {@link Collections#synchronizedSet}
+ * method. This is best done at creation time, to prevent accidental
+ * unsynchronized access:
+ *
+ * <pre>
+ * Set<MyEnum> s = Collections.synchronizedSet(EnumSet.noneOf(MyEnum.class));
+ * </pre>
+ *
+ * <p>Implementation note: All basic operations execute in constant time.
+ * They are likely (though not guaranteed) to be much faster than their
+ * {@link HashSet} counterparts. Even bulk operations execute in
+ * constant time if their argument is also an enum set.
+ *
+ * <p>This class is a member of the
+ * <a href="{@docRoot}/../technotes/guides/collections/index.html">
+ * Java Collections Framework</a>.
+ *
+ * @author Josh Bloch
+ * @since 1.5
+ * @see EnumMap
+ * @serial exclude
+ */
+public abstract class EnumSet<E extends Enum<E>> extends AbstractSet<E>
+ implements Cloneable, java.io.Serializable
+{
+ /**
+ * The class of all the elements of this set.
+ */
+ final Class<E> elementType;
+
+ /**
+ * All of the values comprising T. (Cached for performance.)
+ */
+ final Enum<?>[] universe;
+
+ private static Enum<?>[] ZERO_LENGTH_ENUM_ARRAY = new Enum<?>[0];
+
+ EnumSet(Class<E>elementType, Enum<?>[] universe) {
+ this.elementType = elementType;
+ this.universe = universe;
+ }
+
+ /**
+ * Creates an empty enum set with the specified element type.
+ *
+ * @param <E> The class of the elements in the set
+ * @param elementType the class object of the element type for this enum
+ * set
+ * @return An empty enum set of the specified type.
+ * @throws NullPointerException if <tt>elementType</tt> is null
+ */
+ public static <E extends Enum<E>> EnumSet<E> noneOf(Class<E> elementType) {
+ Enum<?>[] universe = getUniverse(elementType);
+ if (universe == null)
+ throw new ClassCastException(elementType + " not an enum");
+
+ if (universe.length <= 64)
+ return new RegularEnumSet<>(elementType, universe);
+ else
+ return new JumboEnumSet<>(elementType, universe);
+ }
+
+ /**
+ * Creates an enum set containing all of the elements in the specified
+ * element type.
+ *
+ * @param <E> The class of the elements in the set
+ * @param elementType the class object of the element type for this enum
+ * set
+ * @return An enum set containing all the elements in the specified type.
+ * @throws NullPointerException if <tt>elementType</tt> is null
+ */
+ public static <E extends Enum<E>> EnumSet<E> allOf(Class<E> elementType) {
+ EnumSet<E> result = noneOf(elementType);
+ result.addAll();
+ return result;
+ }
+
+ /**
+ * Adds all of the elements from the appropriate enum type to this enum
+ * set, which is empty prior to the call.
+ */
+ abstract void addAll();
+
+ /**
+ * Creates an enum set with the same element type as the specified enum
+ * set, initially containing the same elements (if any).
+ *
+ * @param <E> The class of the elements in the set
+ * @param s the enum set from which to initialize this enum set
+ * @return A copy of the specified enum set.
+ * @throws NullPointerException if <tt>s</tt> is null
+ */
+ public static <E extends Enum<E>> EnumSet<E> copyOf(EnumSet<E> s) {
+ return s.clone();
+ }
+
+ /**
+ * Creates an enum set initialized from the specified collection. If
+ * the specified collection is an <tt>EnumSet</tt> instance, this static
+ * factory method behaves identically to {@link #copyOf(EnumSet)}.
+ * Otherwise, the specified collection must contain at least one element
+ * (in order to determine the new enum set's element type).
+ *
+ * @param <E> The class of the elements in the collection
+ * @param c the collection from which to initialize this enum set
+ * @return An enum set initialized from the given collection.
+ * @throws IllegalArgumentException if <tt>c</tt> is not an
+ * <tt>EnumSet</tt> instance and contains no elements
+ * @throws NullPointerException if <tt>c</tt> is null
+ */
+ public static <E extends Enum<E>> EnumSet<E> copyOf(Collection<E> c) {
+ if (c instanceof EnumSet) {
+ return ((EnumSet<E>)c).clone();
+ } else {
+ if (c.isEmpty())
+ throw new IllegalArgumentException("Collection is empty");
+ Iterator<E> i = c.iterator();
+ E first = i.next();
+ EnumSet<E> result = EnumSet.of(first);
+ while (i.hasNext())
+ result.add(i.next());
+ return result;
+ }
+ }
+
+ /**
+ * Creates an enum set with the same element type as the specified enum
+ * set, initially containing all the elements of this type that are
+ * <i>not</i> contained in the specified set.
+ *
+ * @param <E> The class of the elements in the enum set
+ * @param s the enum set from whose complement to initialize this enum set
+ * @return The complement of the specified set in this set
+ * @throws NullPointerException if <tt>s</tt> is null
+ */
+ public static <E extends Enum<E>> EnumSet<E> complementOf(EnumSet<E> s) {
+ EnumSet<E> result = copyOf(s);
+ result.complement();
+ return result;
+ }
+
+ /**
+ * Creates an enum set initially containing the specified element.
+ *
+ * Overloadings of this method exist to initialize an enum set with
+ * one through five elements. A sixth overloading is provided that
+ * uses the varargs feature. This overloading may be used to create
+ * an enum set initially containing an arbitrary number of elements, but
+ * is likely to run slower than the overloadings that do not use varargs.
+ *
+ * @param <E> The class of the specified element and of the set
+ * @param e the element that this set is to contain initially
+ * @throws NullPointerException if <tt>e</tt> is null
+ * @return an enum set initially containing the specified element
+ */
+ public static <E extends Enum<E>> EnumSet<E> of(E e) {
+ EnumSet<E> result = noneOf(e.getDeclaringClass());
+ result.add(e);
+ return result;
+ }
+
+ /**
+ * Creates an enum set initially containing the specified elements.
+ *
+ * Overloadings of this method exist to initialize an enum set with
+ * one through five elements. A sixth overloading is provided that
+ * uses the varargs feature. This overloading may be used to create
+ * an enum set initially containing an arbitrary number of elements, but
+ * is likely to run slower than the overloadings that do not use varargs.
+ *
+ * @param <E> The class of the parameter elements and of the set
+ * @param e1 an element that this set is to contain initially
+ * @param e2 another element that this set is to contain initially
+ * @throws NullPointerException if any parameters are null
+ * @return an enum set initially containing the specified elements
+ */
+ public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2) {
+ EnumSet<E> result = noneOf(e1.getDeclaringClass());
+ result.add(e1);
+ result.add(e2);
+ return result;
+ }
+
+ /**
+ * Creates an enum set initially containing the specified elements.
+ *
+ * Overloadings of this method exist to initialize an enum set with
+ * one through five elements. A sixth overloading is provided that
+ * uses the varargs feature. This overloading may be used to create
+ * an enum set initially containing an arbitrary number of elements, but
+ * is likely to run slower than the overloadings that do not use varargs.
+ *
+ * @param <E> The class of the parameter elements and of the set
+ * @param e1 an element that this set is to contain initially
+ * @param e2 another element that this set is to contain initially
+ * @param e3 another element that this set is to contain initially
+ * @throws NullPointerException if any parameters are null
+ * @return an enum set initially containing the specified elements
+ */
+ public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3) {
+ EnumSet<E> result = noneOf(e1.getDeclaringClass());
+ result.add(e1);
+ result.add(e2);
+ result.add(e3);
+ return result;
+ }
+
+ /**
+ * Creates an enum set initially containing the specified elements.
+ *
+ * Overloadings of this method exist to initialize an enum set with
+ * one through five elements. A sixth overloading is provided that
+ * uses the varargs feature. This overloading may be used to create
+ * an enum set initially containing an arbitrary number of elements, but
+ * is likely to run slower than the overloadings that do not use varargs.
+ *
+ * @param <E> The class of the parameter elements and of the set
+ * @param e1 an element that this set is to contain initially
+ * @param e2 another element that this set is to contain initially
+ * @param e3 another element that this set is to contain initially
+ * @param e4 another element that this set is to contain initially
+ * @throws NullPointerException if any parameters are null
+ * @return an enum set initially containing the specified elements
+ */
+ public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3, E e4) {
+ EnumSet<E> result = noneOf(e1.getDeclaringClass());
+ result.add(e1);
+ result.add(e2);
+ result.add(e3);
+ result.add(e4);
+ return result;
+ }
+
+ /**
+ * Creates an enum set initially containing the specified elements.
+ *
+ * Overloadings of this method exist to initialize an enum set with
+ * one through five elements. A sixth overloading is provided that
+ * uses the varargs feature. This overloading may be used to create
+ * an enum set initially containing an arbitrary number of elements, but
+ * is likely to run slower than the overloadings that do not use varargs.
+ *
+ * @param <E> The class of the parameter elements and of the set
+ * @param e1 an element that this set is to contain initially
+ * @param e2 another element that this set is to contain initially
+ * @param e3 another element that this set is to contain initially
+ * @param e4 another element that this set is to contain initially
+ * @param e5 another element that this set is to contain initially
+ * @throws NullPointerException if any parameters are null
+ * @return an enum set initially containing the specified elements
+ */
+ public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3, E e4,
+ E e5)
+ {
+ EnumSet<E> result = noneOf(e1.getDeclaringClass());
+ result.add(e1);
+ result.add(e2);
+ result.add(e3);
+ result.add(e4);
+ result.add(e5);
+ return result;
+ }
+
+ /**
+ * Creates an enum set initially containing the specified elements.
+ * This factory, whose parameter list uses the varargs feature, may
+ * be used to create an enum set initially containing an arbitrary
+ * number of elements, but it is likely to run slower than the overloadings
+ * that do not use varargs.
+ *
+ * @param <E> The class of the parameter elements and of the set
+ * @param first an element that the set is to contain initially
+ * @param rest the remaining elements the set is to contain initially
+ * @throws NullPointerException if any of the specified elements are null,
+ * or if <tt>rest</tt> is null
+ * @return an enum set initially containing the specified elements
+ */
+ @SafeVarargs
+ public static <E extends Enum<E>> EnumSet<E> of(E first, E... rest) {
+ EnumSet<E> result = noneOf(first.getDeclaringClass());
+ result.add(first);
+ for (E e : rest)
+ result.add(e);
+ return result;
+ }
+
+ /**
+ * Creates an enum set initially containing all of the elements in the
+ * range defined by the two specified endpoints. The returned set will
+ * contain the endpoints themselves, which may be identical but must not
+ * be out of order.
+ *
+ * @param <E> The class of the parameter elements and of the set
+ * @param from the first element in the range
+ * @param to the last element in the range
+ * @throws NullPointerException if {@code from} or {@code to} are null
+ * @throws IllegalArgumentException if {@code from.compareTo(to) > 0}
+ * @return an enum set initially containing all of the elements in the
+ * range defined by the two specified endpoints
+ */
+ public static <E extends Enum<E>> EnumSet<E> range(E from, E to) {
+ if (from.compareTo(to) > 0)
+ throw new IllegalArgumentException(from + " > " + to);
+ EnumSet<E> result = noneOf(from.getDeclaringClass());
+ result.addRange(from, to);
+ return result;
+ }
+
+ /**
+ * Adds the specified range to this enum set, which is empty prior
+ * to the call.
+ */
+ abstract void addRange(E from, E to);
+
+ /**
+ * Returns a copy of this set.
+ *
+ * @return a copy of this set
+ */
+ @SuppressWarnings("unchecked")
+ public EnumSet<E> clone() {
+ try {
+ return (EnumSet<E>) super.clone();
+ } catch(CloneNotSupportedException e) {
+ throw new AssertionError(e);
+ }
+ }
+
+ /**
+ * Complements the contents of this enum set.
+ */
+ abstract void complement();
+
+ /**
+ * Throws an exception if e is not of the correct type for this enum set.
+ */
+ final void typeCheck(E e) {
+ Class<?> eClass = e.getClass();
+ if (eClass != elementType && eClass.getSuperclass() != elementType)
+ throw new ClassCastException(eClass + " != " + elementType);
+ }
+
+ /**
+ * Returns all of the values comprising E.
+ * The result is uncloned, cached, and shared by all callers.
+ */
+ private static <E extends Enum<E>> E[] getUniverse(Class<E> elementType) {
+ // Android-changed: Use getEnumConstantsShared directly instead of going
+ // through SharedSecrets.
+ return elementType.getEnumConstantsShared();
+ }
+
+ /**
+ * This class is used to serialize all EnumSet instances, regardless of
+ * implementation type. It captures their "logical contents" and they
+ * are reconstructed using public static factories. This is necessary
+ * to ensure that the existence of a particular implementation type is
+ * an implementation detail.
+ *
+ * @serial include
+ */
+ private static class SerializationProxy <E extends Enum<E>>
+ implements java.io.Serializable
+ {
+ /**
+ * The element type of this enum set.
+ *
+ * @serial
+ */
+ private final Class<E> elementType;
+
+ /**
+ * The elements contained in this enum set.
+ *
+ * @serial
+ */
+ private final Enum<?>[] elements;
+
+ SerializationProxy(EnumSet<E> set) {
+ elementType = set.elementType;
+ elements = set.toArray(ZERO_LENGTH_ENUM_ARRAY);
+ }
+
+ // instead of cast to E, we should perhaps use elementType.cast()
+ // to avoid injection of forged stream, but it will slow the implementation
+ @SuppressWarnings("unchecked")
+ private Object readResolve() {
+ EnumSet<E> result = EnumSet.noneOf(elementType);
+ for (Enum<?> e : elements)
+ result.add((E)e);
+ return result;
+ }
+
+ private static final long serialVersionUID = 362491234563181265L;
+ }
+
+ Object writeReplace() {
+ return new SerializationProxy<>(this);
+ }
+
+ // readObject method for the serialization proxy pattern
+ // See Effective Java, Second Ed., Item 78.
+ private void readObject(java.io.ObjectInputStream stream)
+ throws java.io.InvalidObjectException {
+ throw new java.io.InvalidObjectException("Proxy required");
+ }
+}
