| /* |
| * Copyright 2003-2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.collections.set; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| import org.apache.commons.collections.Unmodifiable; |
| import org.apache.commons.collections.iterators.UnmodifiableIterator; |
| |
| /** |
| * Decorates another <code>Set</code> to ensure it can't be altered. |
| * <p> |
| * This class is Serializable from Commons Collections 3.1. |
| * |
| * @since Commons Collections 3.0 |
| * @version $Revision: 1.1 $ $Date: 2009/05/27 22:16:31 $ |
| * |
| * @author Stephen Colebourne |
| */ |
| public final class UnmodifiableSet |
| extends AbstractSerializableSetDecorator |
| implements Unmodifiable { |
| |
| /** Serialization version */ |
| private static final long serialVersionUID = 6499119872185240161L; |
| |
| /** |
| * Factory method to create an unmodifiable set. |
| * |
| * @param set the set to decorate, must not be null |
| * @throws IllegalArgumentException if set is null |
| */ |
| public static Set decorate(Set set) { |
| if (set instanceof Unmodifiable) { |
| return set; |
| } |
| return new UnmodifiableSet(set); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Constructor that wraps (not copies). |
| * |
| * @param set the set to decorate, must not be null |
| * @throws IllegalArgumentException if set is null |
| */ |
| private UnmodifiableSet(Set set) { |
| super(set); |
| } |
| |
| //----------------------------------------------------------------------- |
| public Iterator iterator() { |
| return UnmodifiableIterator.decorate(getCollection().iterator()); |
| } |
| |
| public boolean add(Object object) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean addAll(Collection coll) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void clear() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean remove(Object object) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean removeAll(Collection coll) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean retainAll(Collection coll) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| } |