/* * Copyright (c) 2003, 2011, 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;/** * Private implementation class for EnumSet, for "regular sized" enum types * (i.e., those with 64 or fewer enum constants). * * @author Josh Bloch * @since 1.5 * @serial exclude */class RegularEnumSet<E extends Enum<E>> extends EnumSet<E> { private static final long serialVersionUID = 3411599620347842686L; /** * Bit vector representation of this set. The 2^k bit indicates the * presence of universe[k] in this set. */ private long elements = 0L; RegularEnumSet(Class<E>elementType, Enum[] universe) { super(elementType, universe); } void addRange(E from, E to) { elements = (-1L >>> (from.ordinal() - to.ordinal() - 1)) << from.ordinal(); } void addAll() { if (universe.length != 0) elements = -1L >>> -universe.length; } void complement() { if (universe.length != 0) { elements = ~elements; elements &= -1L >>> -universe.length; // Mask unused bits } } /** * Returns an iterator over the elements contained in this set. The * iterator traverses the elements in their <i>natural order</i> (which is * the order in which the enum constants are declared). The returned * Iterator is a "snapshot" iterator that will never throw {@link * ConcurrentModificationException}; the elements are traversed as they * existed when this call was invoked. * * @return an iterator over the elements contained in this set */ public Iterator<E> iterator() { return new EnumSetIterator<>(); } private class EnumSetIterator<E extends Enum<E>> implements Iterator<E> { /** * A bit vector representing the elements in the set not yet * returned by this iterator. */ long unseen; /** * The bit representing the last element returned by this iterator * but not removed, or zero if no such element exists. */ long lastReturned = 0; EnumSetIterator() { unseen = elements; } public boolean hasNext() { return unseen != 0; } public E next() { if (unseen == 0) throw new NoSuchElementException(); lastReturned = unseen & -unseen; unseen -= lastReturned; return (E) universe[Long.numberOfTrailingZeros(lastReturned)]; } public void remove() { if (lastReturned == 0) throw new IllegalStateException(); elements &= ~lastReturned; lastReturned = 0; } } /** * Returns the number of elements in this set. * * @return the number of elements in this set */ public int size() { return Long.bitCount(elements); } /** * Returns <tt>true</tt> if this set contains no elements. * * @return <tt>true</tt> if this set contains no elements */ public boolean isEmpty() { return elements == 0; } /** * Returns <tt>true</tt> if this set contains the specified element. * * @param e element to be checked for containment in this collection * @return <tt>true</tt> if this set contains the specified element */ public boolean contains(Object e) { if (e == null) return false; Class eClass = e.getClass(); if (eClass != elementType && eClass.getSuperclass() != elementType) return false; return (elements & (1L << ((Enum)e).ordinal())) != 0; } // Modification Operations /** * Adds the specified element to this set if it is not already present. * * @param e element to be added to this set * @return <tt>true</tt> if the set changed as a result of the call * * @throws NullPointerException if <tt>e</tt> is null */ public boolean add(E e) { typeCheck(e); long oldElements = elements; elements |= (1L << ((Enum)e).ordinal()); return elements != oldElements; } /** * Removes the specified element from this set if it is present. * * @param e element to be removed from this set, if present * @return <tt>true</tt> if the set contained the specified element */ public boolean remove(Object e) { if (e == null) return false; Class eClass = e.getClass(); if (eClass != elementType && eClass.getSuperclass() != elementType) return false; long oldElements = elements; elements &= ~(1L << ((Enum)e).ordinal()); return elements != oldElements; } // Bulk Operations /** * Returns <tt>true</tt> if this set contains all of the elements * in the specified collection. * * @param c collection to be checked for containment in this set * @return <tt>true</tt> if this set contains all of the elements * in the specified collection * @throws NullPointerException if the specified collection is null */ public boolean containsAll(Collection<?> c) { if (!(c instanceof RegularEnumSet)) return super.containsAll(c); RegularEnumSet es = (RegularEnumSet)c; if (es.elementType != elementType) return es.isEmpty(); return (es.elements & ~elements) == 0; } /** * Adds all of the elements in the specified collection to this set. * * @param c collection whose elements are to be added to this set * @return <tt>true</tt> if this set changed as a result of the call * @throws NullPointerException if the specified collection or any * of its elements are null */ public boolean addAll(Collection<? extends E> c) { if (!(c instanceof RegularEnumSet)) return super.addAll(c); RegularEnumSet es = (RegularEnumSet)c; if (es.elementType != elementType) { if (es.isEmpty()) return false; else throw new ClassCastException( es.elementType + " != " + elementType); } long oldElements = elements; elements |= es.elements; return elements != oldElements; } /** * Removes from this set all of its elements that are contained in * the specified collection. * * @param c elements to be removed from this set * @return <tt>true</tt> if this set changed as a result of the call * @throws NullPointerException if the specified collection is null */ public boolean removeAll(Collection<?> c) { if (!(c instanceof RegularEnumSet)) return super.removeAll(c); RegularEnumSet es = (RegularEnumSet)c; if (es.elementType != elementType) return false; long oldElements = elements; elements &= ~es.elements; return elements != oldElements; } /** * Retains only the elements in this set that are contained in the * specified collection. * * @param c elements to be retained in this set * @return <tt>true</tt> if this set changed as a result of the call * @throws NullPointerException if the specified collection is null */ public boolean retainAll(Collection<?> c) { if (!(c instanceof RegularEnumSet)) return super.retainAll(c); RegularEnumSet<?> es = (RegularEnumSet<?>)c; if (es.elementType != elementType) { boolean changed = (elements != 0); elements = 0; return changed; } long oldElements = elements; elements &= es.elements; return elements != oldElements; } /** * Removes all of the elements from this set. */ public void clear() { elements = 0; } /** * Compares the specified object with this set for equality. Returns * <tt>true</tt> if the given object is also a set, the two sets have * the same size, and every member of the given set is contained in * this set. * * @param e object to be compared for equality with this set * @return <tt>true</tt> if the specified object is equal to this set */ public boolean equals(Object o) { if (!(o instanceof RegularEnumSet)) return super.equals(o); RegularEnumSet es = (RegularEnumSet)o; if (es.elementType != elementType) return elements == 0 && es.elements == 0; return es.elements == elements; }}
/*
* Copyright (c) 2003, 2011, 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;
/**
* Private implementation class for EnumSet, for "regular sized" enum types
* (i.e., those with 64 or fewer enum constants).
*
* @author Josh Bloch
* @since 1.5
* @serial exclude
*/
class RegularEnumSet<E extends Enum<E>> extends EnumSet<E> {
private static final long serialVersionUID = 3411599620347842686L;
/**
* Bit vector representation of this set. The 2^k bit indicates the
* presence of universe[k] in this set.
*/
private long elements = 0L;
RegularEnumSet(Class<E>elementType, Enum[] universe) {
super(elementType, universe);
}
void addRange(E from, E to) {
elements = (-1L >>> (from.ordinal() - to.ordinal() - 1)) << from.ordinal();
}
void addAll() {
if (universe.length != 0)
elements = -1L >>> -universe.length;
}
void complement() {
if (universe.length != 0) {
elements = ~elements;
elements &= -1L >>> -universe.length; // Mask unused bits
}
}
/**
* Returns an iterator over the elements contained in this set. The
* iterator traverses the elements in their <i>natural order</i> (which is
* the order in which the enum constants are declared). The returned
* Iterator is a "snapshot" iterator that will never throw {@link
* ConcurrentModificationException}; the elements are traversed as they
* existed when this call was invoked.
*
* @return an iterator over the elements contained in this set
*/
public Iterator<E> iterator() {
return new EnumSetIterator<>();
}
private class EnumSetIterator<E extends Enum<E>> implements Iterator<E> {
/**
* A bit vector representing the elements in the set not yet
* returned by this iterator.
*/
long unseen;
/**
* The bit representing the last element returned by this iterator
* but not removed, or zero if no such element exists.
*/
long lastReturned = 0;
EnumSetIterator() {
unseen = elements;
}
public boolean hasNext() {
return unseen != 0;
}
public E next() {
if (unseen == 0)
throw new NoSuchElementException();
lastReturned = unseen & -unseen;
unseen -= lastReturned;
return (E) universe[Long.numberOfTrailingZeros(lastReturned)];
}
public void remove() {
if (lastReturned == 0)
throw new IllegalStateException();
elements &= ~lastReturned;
lastReturned = 0;
}
}
/**
* Returns the number of elements in this set.
*
* @return the number of elements in this set
*/
public int size() {
return Long.bitCount(elements);
}
/**
* Returns <tt>true</tt> if this set contains no elements.
*
* @return <tt>true</tt> if this set contains no elements
*/
public boolean isEmpty() {
return elements == 0;
}
/**
* Returns <tt>true</tt> if this set contains the specified element.
*
* @param e element to be checked for containment in this collection
* @return <tt>true</tt> if this set contains the specified element
*/
public boolean contains(Object e) {
if (e == null)
return false;
Class eClass = e.getClass();
if (eClass != elementType && eClass.getSuperclass() != elementType)
return false;
return (elements & (1L << ((Enum)e).ordinal())) != 0;
}
// Modification Operations
/**
* Adds the specified element to this set if it is not already present.
*
* @param e element to be added to this set
* @return <tt>true</tt> if the set changed as a result of the call
*
* @throws NullPointerException if <tt>e</tt> is null
*/
public boolean add(E e) {
typeCheck(e);
long oldElements = elements;
elements |= (1L << ((Enum)e).ordinal());
return elements != oldElements;
}
/**
* Removes the specified element from this set if it is present.
*
* @param e element to be removed from this set, if present
* @return <tt>true</tt> if the set contained the specified element
*/
public boolean remove(Object e) {
if (e == null)
return false;
Class eClass = e.getClass();
if (eClass != elementType && eClass.getSuperclass() != elementType)
return false;
long oldElements = elements;
elements &= ~(1L << ((Enum)e).ordinal());
return elements != oldElements;
}
// Bulk Operations
/**
* Returns <tt>true</tt> if this set contains all of the elements
* in the specified collection.
*
* @param c collection to be checked for containment in this set
* @return <tt>true</tt> if this set contains all of the elements
* in the specified collection
* @throws NullPointerException if the specified collection is null
*/
public boolean containsAll(Collection<?> c) {
if (!(c instanceof RegularEnumSet))
return super.containsAll(c);
RegularEnumSet es = (RegularEnumSet)c;
if (es.elementType != elementType)
return es.isEmpty();
return (es.elements & ~elements) == 0;
}
/**
* Adds all of the elements in the specified collection to this set.
*
* @param c collection whose elements are to be added to this set
* @return <tt>true</tt> if this set changed as a result of the call
* @throws NullPointerException if the specified collection or any
* of its elements are null
*/
public boolean addAll(Collection<? extends E> c) {
if (!(c instanceof RegularEnumSet))
return super.addAll(c);
RegularEnumSet es = (RegularEnumSet)c;
if (es.elementType != elementType) {
if (es.isEmpty())
return false;
else
throw new ClassCastException(
es.elementType + " != " + elementType);
}
long oldElements = elements;
elements |= es.elements;
return elements != oldElements;
}
/**
* Removes from this set all of its elements that are contained in
* the specified collection.
*
* @param c elements to be removed from this set
* @return <tt>true</tt> if this set changed as a result of the call
* @throws NullPointerException if the specified collection is null
*/
public boolean removeAll(Collection<?> c) {
if (!(c instanceof RegularEnumSet))
return super.removeAll(c);
RegularEnumSet es = (RegularEnumSet)c;
if (es.elementType != elementType)
return false;
long oldElements = elements;
elements &= ~es.elements;
return elements != oldElements;
}
/**
* Retains only the elements in this set that are contained in the
* specified collection.
*
* @param c elements to be retained in this set
* @return <tt>true</tt> if this set changed as a result of the call
* @throws NullPointerException if the specified collection is null
*/
public boolean retainAll(Collection<?> c) {
if (!(c instanceof RegularEnumSet))
return super.retainAll(c);
RegularEnumSet<?> es = (RegularEnumSet<?>)c;
if (es.elementType != elementType) {
boolean changed = (elements != 0);
elements = 0;
return changed;
}
long oldElements = elements;
elements &= es.elements;
return elements != oldElements;
}
/**
* Removes all of the elements from this set.
*/
public void clear() {
elements = 0;
}
/**
* Compares the specified object with this set for equality. Returns
* <tt>true</tt> if the given object is also a set, the two sets have
* the same size, and every member of the given set is contained in
* this set.
*
* @param e object to be compared for equality with this set
* @return <tt>true</tt> if the specified object is equal to this set
*/
public boolean equals(Object o) {
if (!(o instanceof RegularEnumSet))
return super.equals(o);
RegularEnumSet es = (RegularEnumSet)o;
if (es.elementType != elementType)
return elements == 0 && es.elements == 0;
return es.elements == elements;
}
}