- /*
- * 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.collection;
-
- import java.util.Collection;
- import java.util.Iterator;
-
- import org.apache.commons.collections.Unmodifiable;
- import org.apache.commons.collections.iterators.UnmodifiableIterator;
-
- /**
- * Decorates another <code>Collection</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: 1.8 $ $Date: 2004/06/03 22:02:13 $
- *
- * @author Stephen Colebourne
- */
- public final class UnmodifiableCollection
- extends AbstractSerializableCollectionDecorator
- implements Unmodifiable {
-
- /** Serialization version */
- private static final long serialVersionUID = -239892006883819945L;
-
- /**
- * Factory method to create an unmodifiable collection.
- * <p>
- * If the collection passed in is already unmodifiable, it is returned.
- *
- * @param coll the collection to decorate, must not be null
- * @return an unmodifiable collection
- * @throws IllegalArgumentException if collection is null
- */
- public static Collection decorate(Collection coll) {
- if (coll instanceof Unmodifiable) {
- return coll;
- }
- return new UnmodifiableCollection(coll);
- }
-
- //-----------------------------------------------------------------------
- /**
- * Constructor that wraps (not copies).
- *
- * @param coll the collection to decorate, must not be null
- * @throws IllegalArgumentException if collection is null
- */
- private UnmodifiableCollection(Collection coll) {
- super(coll);
- }
-
- //-----------------------------------------------------------------------
- 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();
- }
-
- }