- /*
- * 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;
-
- /**
- * Marker interface for collections, maps and iterators that are unmodifiable.
- * <p>
- * This interface enables testing such as:
- * <pre>
- * if (coll instanceof Unmodifiable) {
- * coll = new ArrayList(coll);
- * }
- * // now we know coll is modifiable
- * </pre>
- * 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: 1.4 $ $Date: 2004/02/18 01:15:42 $
- *
- * @author Stephen Colebourne
- */
- public interface Unmodifiable {
- // marker interface - no methods to implement
- }