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/*
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* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.util;
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jaroslav@1294
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import org.apidesign.bck2brwsr.core.JavaScriptBody;
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/**
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* A specialized {@link Set} implementation for use with enum types. All of
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* the elements in an enum set must come from a single enum type that is
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* specified, explicitly or implicitly, when the set is created. Enum sets
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* are represented internally as bit vectors. This representation is
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* extremely compact and efficient. The space and time performance of this
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* class should be good enough to allow its use as a high-quality, typesafe
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* alternative to traditional <tt>int</tt>-based "bit flags." Even bulk
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* operations (such as <tt>containsAll</tt> and <tt>retainAll</tt>) should
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* run very quickly if their argument is also an enum set.
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*
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* <p>The iterator returned by the <tt>iterator</tt> method traverses the
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* elements in their <i>natural order</i> (the order in which the enum
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* constants are declared). The returned iterator is <i>weakly
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* consistent</i>: it will never throw {@link ConcurrentModificationException}
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* and it may or may not show the effects of any modifications to the set that
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* occur while the iteration is in progress.
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*
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* <p>Null elements are not permitted. Attempts to insert a null element
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* will throw {@link NullPointerException}. Attempts to test for the
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* presence of a null element or to remove one will, however, function
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* properly.
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*
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* <P>Like most collection implementations, <tt>EnumSet</tt> is not
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* synchronized. If multiple threads access an enum set concurrently, and at
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* least one of the threads modifies the set, it should be synchronized
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* externally. This is typically accomplished by synchronizing on some
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* object that naturally encapsulates the enum set. If no such object exists,
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* the set should be "wrapped" using the {@link Collections#synchronizedSet}
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* method. This is best done at creation time, to prevent accidental
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* unsynchronized access:
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*
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* <pre>
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* Set<MyEnum> s = Collections.synchronizedSet(EnumSet.noneOf(MyEnum.class));
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* </pre>
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*
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* <p>Implementation note: All basic operations execute in constant time.
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* They are likely (though not guaranteed) to be much faster than their
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* {@link HashSet} counterparts. Even bulk operations execute in
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* constant time if their argument is also an enum set.
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*
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* <p>This class is a member of the
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* <a href="{@docRoot}/../technotes/guides/collections/index.html">
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* Java Collections Framework</a>.
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*
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* @author Josh Bloch
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* @since 1.5
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* @see EnumMap
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* @serial exclude
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*/
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public abstract class EnumSet<E extends Enum<E>> extends AbstractSet<E>
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implements Cloneable, java.io.Serializable
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{
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/**
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* The class of all the elements of this set.
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*/
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final Class<E> elementType;
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/**
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* All of the values comprising T. (Cached for performance.)
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*/
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final Enum[] universe;
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private static Enum[] ZERO_LENGTH_ENUM_ARRAY = new Enum[0];
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EnumSet(Class<E>elementType, Enum[] universe) {
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this.elementType = elementType;
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this.universe = universe;
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}
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/**
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* Creates an empty enum set with the specified element type.
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*
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* @param elementType the class object of the element type for this enum
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* set
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* @throws NullPointerException if <tt>elementType</tt> is null
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*/
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public static <E extends Enum<E>> EnumSet<E> noneOf(Class<E> elementType) {
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Enum[] universe = getUniverse(elementType);
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if (universe == null)
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throw new ClassCastException(elementType + " not an enum");
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if (universe.length <= 64)
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return new RegularEnumSet<>(elementType, universe);
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else
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return new JumboEnumSet<>(elementType, universe);
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}
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/**
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* Creates an enum set containing all of the elements in the specified
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* element type.
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*
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* @param elementType the class object of the element type for this enum
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* set
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* @throws NullPointerException if <tt>elementType</tt> is null
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*/
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public static <E extends Enum<E>> EnumSet<E> allOf(Class<E> elementType) {
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EnumSet<E> result = noneOf(elementType);
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result.addAll();
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return result;
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}
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/**
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* Adds all of the elements from the appropriate enum type to this enum
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* set, which is empty prior to the call.
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*/
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abstract void addAll();
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/**
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* Creates an enum set with the same element type as the specified enum
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* set, initially containing the same elements (if any).
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*
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* @param s the enum set from which to initialize this enum set
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* @throws NullPointerException if <tt>s</tt> is null
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*/
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public static <E extends Enum<E>> EnumSet<E> copyOf(EnumSet<E> s) {
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return s.clone();
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}
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/**
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* Creates an enum set initialized from the specified collection. If
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* the specified collection is an <tt>EnumSet</tt> instance, this static
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* factory method behaves identically to {@link #copyOf(EnumSet)}.
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* Otherwise, the specified collection must contain at least one element
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* (in order to determine the new enum set's element type).
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*
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* @param c the collection from which to initialize this enum set
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* @throws IllegalArgumentException if <tt>c</tt> is not an
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* <tt>EnumSet</tt> instance and contains no elements
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* @throws NullPointerException if <tt>c</tt> is null
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*/
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public static <E extends Enum<E>> EnumSet<E> copyOf(Collection<E> c) {
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if (c instanceof EnumSet) {
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return ((EnumSet<E>)c).clone();
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} else {
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if (c.isEmpty())
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throw new IllegalArgumentException("Collection is empty");
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Iterator<E> i = c.iterator();
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E first = i.next();
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EnumSet<E> result = EnumSet.of(first);
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while (i.hasNext())
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result.add(i.next());
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return result;
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}
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}
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/**
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* Creates an enum set with the same element type as the specified enum
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* set, initially containing all the elements of this type that are
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* <i>not</i> contained in the specified set.
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*
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* @param s the enum set from whose complement to initialize this enum set
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* @throws NullPointerException if <tt>s</tt> is null
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*/
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public static <E extends Enum<E>> EnumSet<E> complementOf(EnumSet<E> s) {
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EnumSet<E> result = copyOf(s);
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result.complement();
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return result;
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}
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/**
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* Creates an enum set initially containing the specified element.
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*
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* Overloadings of this method exist to initialize an enum set with
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* one through five elements. A sixth overloading is provided that
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* uses the varargs feature. This overloading may be used to create
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* an enum set initially containing an arbitrary number of elements, but
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* is likely to run slower than the overloadings that do not use varargs.
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*
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* @param e the element that this set is to contain initially
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* @throws NullPointerException if <tt>e</tt> is null
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* @return an enum set initially containing the specified element
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*/
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public static <E extends Enum<E>> EnumSet<E> of(E e) {
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EnumSet<E> result = noneOf(e.getDeclaringClass());
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result.add(e);
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return result;
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}
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/**
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* Creates an enum set initially containing the specified elements.
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*
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* Overloadings of this method exist to initialize an enum set with
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* one through five elements. A sixth overloading is provided that
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* uses the varargs feature. This overloading may be used to create
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* an enum set initially containing an arbitrary number of elements, but
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* is likely to run slower than the overloadings that do not use varargs.
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*
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* @param e1 an element that this set is to contain initially
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* @param e2 another element that this set is to contain initially
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* @throws NullPointerException if any parameters are null
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* @return an enum set initially containing the specified elements
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*/
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public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2) {
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EnumSet<E> result = noneOf(e1.getDeclaringClass());
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result.add(e1);
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result.add(e2);
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return result;
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}
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/**
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* Creates an enum set initially containing the specified elements.
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*
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* Overloadings of this method exist to initialize an enum set with
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* one through five elements. A sixth overloading is provided that
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* uses the varargs feature. This overloading may be used to create
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* an enum set initially containing an arbitrary number of elements, but
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* is likely to run slower than the overloadings that do not use varargs.
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*
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* @param e1 an element that this set is to contain initially
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* @param e2 another element that this set is to contain initially
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* @param e3 another element that this set is to contain initially
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* @throws NullPointerException if any parameters are null
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* @return an enum set initially containing the specified elements
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*/
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public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3) {
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EnumSet<E> result = noneOf(e1.getDeclaringClass());
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result.add(e1);
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result.add(e2);
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result.add(e3);
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return result;
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}
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jtulach@1292
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/**
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jtulach@1292
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* Creates an enum set initially containing the specified elements.
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*
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* Overloadings of this method exist to initialize an enum set with
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* one through five elements. A sixth overloading is provided that
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* uses the varargs feature. This overloading may be used to create
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* an enum set initially containing an arbitrary number of elements, but
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* is likely to run slower than the overloadings that do not use varargs.
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*
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* @param e1 an element that this set is to contain initially
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* @param e2 another element that this set is to contain initially
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* @param e3 another element that this set is to contain initially
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* @param e4 another element that this set is to contain initially
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* @throws NullPointerException if any parameters are null
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* @return an enum set initially containing the specified elements
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*/
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public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3, E e4) {
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EnumSet<E> result = noneOf(e1.getDeclaringClass());
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result.add(e1);
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result.add(e2);
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result.add(e3);
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result.add(e4);
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return result;
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}
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/**
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* Creates an enum set initially containing the specified elements.
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*
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* Overloadings of this method exist to initialize an enum set with
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* one through five elements. A sixth overloading is provided that
|
jtulach@1292
|
283 |
* uses the varargs feature. This overloading may be used to create
|
jtulach@1292
|
284 |
* an enum set initially containing an arbitrary number of elements, but
|
jtulach@1292
|
285 |
* is likely to run slower than the overloadings that do not use varargs.
|
jtulach@1292
|
286 |
*
|
jtulach@1292
|
287 |
* @param e1 an element that this set is to contain initially
|
jtulach@1292
|
288 |
* @param e2 another element that this set is to contain initially
|
jtulach@1292
|
289 |
* @param e3 another element that this set is to contain initially
|
jtulach@1292
|
290 |
* @param e4 another element that this set is to contain initially
|
jtulach@1292
|
291 |
* @param e5 another element that this set is to contain initially
|
jtulach@1292
|
292 |
* @throws NullPointerException if any parameters are null
|
jtulach@1292
|
293 |
* @return an enum set initially containing the specified elements
|
jtulach@1292
|
294 |
*/
|
jtulach@1292
|
295 |
public static <E extends Enum<E>> EnumSet<E> of(E e1, E e2, E e3, E e4,
|
jtulach@1292
|
296 |
E e5)
|
jtulach@1292
|
297 |
{
|
jtulach@1292
|
298 |
EnumSet<E> result = noneOf(e1.getDeclaringClass());
|
jtulach@1292
|
299 |
result.add(e1);
|
jtulach@1292
|
300 |
result.add(e2);
|
jtulach@1292
|
301 |
result.add(e3);
|
jtulach@1292
|
302 |
result.add(e4);
|
jtulach@1292
|
303 |
result.add(e5);
|
jtulach@1292
|
304 |
return result;
|
jtulach@1292
|
305 |
}
|
jtulach@1292
|
306 |
|
jtulach@1292
|
307 |
/**
|
jtulach@1292
|
308 |
* Creates an enum set initially containing the specified elements.
|
jtulach@1292
|
309 |
* This factory, whose parameter list uses the varargs feature, may
|
jtulach@1292
|
310 |
* be used to create an enum set initially containing an arbitrary
|
jtulach@1292
|
311 |
* number of elements, but it is likely to run slower than the overloadings
|
jtulach@1292
|
312 |
* that do not use varargs.
|
jtulach@1292
|
313 |
*
|
jtulach@1292
|
314 |
* @param first an element that the set is to contain initially
|
jtulach@1292
|
315 |
* @param rest the remaining elements the set is to contain initially
|
jtulach@1292
|
316 |
* @throws NullPointerException if any of the specified elements are null,
|
jtulach@1292
|
317 |
* or if <tt>rest</tt> is null
|
jtulach@1292
|
318 |
* @return an enum set initially containing the specified elements
|
jtulach@1292
|
319 |
*/
|
jtulach@1292
|
320 |
@SafeVarargs
|
jtulach@1292
|
321 |
public static <E extends Enum<E>> EnumSet<E> of(E first, E... rest) {
|
jtulach@1292
|
322 |
EnumSet<E> result = noneOf(first.getDeclaringClass());
|
jtulach@1292
|
323 |
result.add(first);
|
jtulach@1292
|
324 |
for (E e : rest)
|
jtulach@1292
|
325 |
result.add(e);
|
jtulach@1292
|
326 |
return result;
|
jtulach@1292
|
327 |
}
|
jtulach@1292
|
328 |
|
jtulach@1292
|
329 |
/**
|
jtulach@1292
|
330 |
* Creates an enum set initially containing all of the elements in the
|
jtulach@1292
|
331 |
* range defined by the two specified endpoints. The returned set will
|
jtulach@1292
|
332 |
* contain the endpoints themselves, which may be identical but must not
|
jtulach@1292
|
333 |
* be out of order.
|
jtulach@1292
|
334 |
*
|
jtulach@1292
|
335 |
* @param from the first element in the range
|
jtulach@1292
|
336 |
* @param to the last element in the range
|
jtulach@1292
|
337 |
* @throws NullPointerException if {@code from} or {@code to} are null
|
jtulach@1292
|
338 |
* @throws IllegalArgumentException if {@code from.compareTo(to) > 0}
|
jtulach@1292
|
339 |
* @return an enum set initially containing all of the elements in the
|
jtulach@1292
|
340 |
* range defined by the two specified endpoints
|
jtulach@1292
|
341 |
*/
|
jtulach@1292
|
342 |
public static <E extends Enum<E>> EnumSet<E> range(E from, E to) {
|
jtulach@1292
|
343 |
if (from.compareTo(to) > 0)
|
jtulach@1292
|
344 |
throw new IllegalArgumentException(from + " > " + to);
|
jtulach@1292
|
345 |
EnumSet<E> result = noneOf(from.getDeclaringClass());
|
jtulach@1292
|
346 |
result.addRange(from, to);
|
jtulach@1292
|
347 |
return result;
|
jtulach@1292
|
348 |
}
|
jtulach@1292
|
349 |
|
jtulach@1292
|
350 |
/**
|
jtulach@1292
|
351 |
* Adds the specified range to this enum set, which is empty prior
|
jtulach@1292
|
352 |
* to the call.
|
jtulach@1292
|
353 |
*/
|
jtulach@1292
|
354 |
abstract void addRange(E from, E to);
|
jtulach@1292
|
355 |
|
jtulach@1292
|
356 |
/**
|
jtulach@1292
|
357 |
* Returns a copy of this set.
|
jtulach@1292
|
358 |
*
|
jtulach@1292
|
359 |
* @return a copy of this set
|
jtulach@1292
|
360 |
*/
|
jtulach@1292
|
361 |
public EnumSet<E> clone() {
|
jtulach@1292
|
362 |
try {
|
jtulach@1292
|
363 |
return (EnumSet<E>) super.clone();
|
jtulach@1292
|
364 |
} catch(CloneNotSupportedException e) {
|
jtulach@1292
|
365 |
throw new AssertionError(e);
|
jtulach@1292
|
366 |
}
|
jtulach@1292
|
367 |
}
|
jtulach@1292
|
368 |
|
jtulach@1292
|
369 |
/**
|
jtulach@1292
|
370 |
* Complements the contents of this enum set.
|
jtulach@1292
|
371 |
*/
|
jtulach@1292
|
372 |
abstract void complement();
|
jtulach@1292
|
373 |
|
jtulach@1292
|
374 |
/**
|
jtulach@1292
|
375 |
* Throws an exception if e is not of the correct type for this enum set.
|
jtulach@1292
|
376 |
*/
|
jtulach@1292
|
377 |
final void typeCheck(E e) {
|
jtulach@1292
|
378 |
Class eClass = e.getClass();
|
jtulach@1292
|
379 |
if (eClass != elementType && eClass.getSuperclass() != elementType)
|
jtulach@1292
|
380 |
throw new ClassCastException(eClass + " != " + elementType);
|
jtulach@1292
|
381 |
}
|
jtulach@1292
|
382 |
|
jtulach@1292
|
383 |
/**
|
jtulach@1292
|
384 |
* Returns all of the values comprising E.
|
jtulach@1292
|
385 |
* The result is uncloned, cached, and shared by all callers.
|
jtulach@1292
|
386 |
*/
|
jaroslav@1561
|
387 |
@JavaScriptBody(args = { "enumType" }, body = "return enumType.cnstr.prototype['_$VALUES']();")
|
jaroslav@1294
|
388 |
private static native <E extends Enum<E>> E[] getUniverse(Class<E> elementType);
|
jtulach@1292
|
389 |
|
jtulach@1292
|
390 |
/**
|
jtulach@1292
|
391 |
* This class is used to serialize all EnumSet instances, regardless of
|
jtulach@1292
|
392 |
* implementation type. It captures their "logical contents" and they
|
jtulach@1292
|
393 |
* are reconstructed using public static factories. This is necessary
|
jtulach@1292
|
394 |
* to ensure that the existence of a particular implementation type is
|
jtulach@1292
|
395 |
* an implementation detail.
|
jtulach@1292
|
396 |
*
|
jtulach@1292
|
397 |
* @serial include
|
jtulach@1292
|
398 |
*/
|
jtulach@1292
|
399 |
private static class SerializationProxy <E extends Enum<E>>
|
jtulach@1292
|
400 |
implements java.io.Serializable
|
jtulach@1292
|
401 |
{
|
jtulach@1292
|
402 |
/**
|
jtulach@1292
|
403 |
* The element type of this enum set.
|
jtulach@1292
|
404 |
*
|
jtulach@1292
|
405 |
* @serial
|
jtulach@1292
|
406 |
*/
|
jtulach@1292
|
407 |
private final Class<E> elementType;
|
jtulach@1292
|
408 |
|
jtulach@1292
|
409 |
/**
|
jtulach@1292
|
410 |
* The elements contained in this enum set.
|
jtulach@1292
|
411 |
*
|
jtulach@1292
|
412 |
* @serial
|
jtulach@1292
|
413 |
*/
|
jtulach@1292
|
414 |
private final Enum[] elements;
|
jtulach@1292
|
415 |
|
jtulach@1292
|
416 |
SerializationProxy(EnumSet<E> set) {
|
jtulach@1292
|
417 |
elementType = set.elementType;
|
jtulach@1292
|
418 |
elements = set.toArray(ZERO_LENGTH_ENUM_ARRAY);
|
jtulach@1292
|
419 |
}
|
jtulach@1292
|
420 |
|
jtulach@1292
|
421 |
private Object readResolve() {
|
jtulach@1292
|
422 |
EnumSet<E> result = EnumSet.noneOf(elementType);
|
jtulach@1292
|
423 |
for (Enum e : elements)
|
jtulach@1292
|
424 |
result.add((E)e);
|
jtulach@1292
|
425 |
return result;
|
jtulach@1292
|
426 |
}
|
jtulach@1292
|
427 |
|
jtulach@1292
|
428 |
private static final long serialVersionUID = 362491234563181265L;
|
jtulach@1292
|
429 |
}
|
jtulach@1292
|
430 |
|
jtulach@1292
|
431 |
Object writeReplace() {
|
jtulach@1292
|
432 |
return new SerializationProxy<>(this);
|
jtulach@1292
|
433 |
}
|
jtulach@1292
|
434 |
|
jtulach@1292
|
435 |
// readObject method for the serialization proxy pattern
|
jtulach@1292
|
436 |
// See Effective Java, Second Ed., Item 78.
|
jtulach@1292
|
437 |
private void readObject(java.io.ObjectInputStream stream)
|
jtulach@1292
|
438 |
throws java.io.InvalidObjectException {
|
jtulach@1292
|
439 |
throw new java.io.InvalidObjectException("Proxy required");
|
jtulach@1292
|
440 |
}
|
jtulach@1292
|
441 |
}
|