95 lines
1.8 KiB
Java
95 lines
1.8 KiB
Java
/*******************************************************************************
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* Copyright (c) 2011 - IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.util.intset;
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import java.util.NoSuchElementException;
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public class EmptyIntSet implements IntSet {
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private static final long serialVersionUID = 5116475799916663164L;
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public static EmptyIntSet instance = new EmptyIntSet();
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@Override
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public boolean contains(int i) {
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return false;
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}
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@Override
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public boolean containsAny(IntSet set) {
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return false;
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}
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@Override
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public IntSet intersection(IntSet that) {
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return this;
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}
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@Override
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public IntSet union(IntSet that) {
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return that;
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}
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@Override
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public boolean isEmpty() {
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return true;
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}
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@Override
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public int size() {
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return 0;
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}
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private static final IntIterator emptyIter = new IntIterator() {
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@Override
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public boolean hasNext() {
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return false;
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}
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@Override
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public int next() {
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throw new NoSuchElementException();
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}
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};
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@Override
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public IntIterator intIterator() {
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return emptyIter;
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}
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@Override
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public void foreach(IntSetAction action) {
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}
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@Override
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public void foreachExcluding(IntSet X, IntSetAction action) {
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}
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@Override
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public int max() {
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throw new NoSuchElementException();
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}
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@Override
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public boolean sameValue(IntSet that) {
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return that.isEmpty();
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}
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@Override
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public boolean isSubset(IntSet that) {
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return true;
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}
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}
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