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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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;

/**
 * Marker interface for collections, maps and iterators that are unmodifiable.
 * 

* This interface enables testing such as: *

 * if (coll instanceof Unmodifiable) {
 *   coll = new ArrayList(coll);
 * }
 * // now we know coll is modifiable
 * 
* Of course all this only works if you use the Unmodifiable classes defined * in this library. If you use the JDK unmodifiable class via java util Collections * then the interface won't be there. * * @since Commons Collections 3.0 * @version $Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $ * * @author Stephen Colebourne */ public interface Unmodifiable { // marker interface - no methods to implement }




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