1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.utils.datastructures;
14 import java.util.Collection;
15 import java.util.Iterator;
17 public class SingletonCollection<T> extends ImmutableSet<T> {
21 public SingletonCollection(T content) {
22 this.content = content;
26 public boolean contains(Object o) {
27 return content.equals(o);
31 public boolean containsAll(Collection<?> c) {
33 if(!content.equals(o))
39 public boolean isEmpty() {
40 return content == null;
43 static class SingletonIterator<T> extends ImmutableIterator<T> {
47 public SingletonIterator(T content) {
48 this.content = content;
52 public boolean hasNext() {
53 return(content != null);
66 public Iterator<T> iterator() {
67 return new SingletonIterator<T>(content);