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Commons Collections example source code file (TypedMap.java)

This example Commons Collections source code file (TypedMap.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

class, class, map, map, predicatedmap, predicatedmap, typedmap, typedmap, util

The Commons Collections TypedMap.java source code

 *  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.map;

import java.util.Map;

import org.apache.commons.collections.functors.InstanceofPredicate;

 * Decorates another <code>Map to validate that elements added
 * are of a specific type.
 * <p>
 * The validation of additions is performed via an instanceof test against 
 * a specified <code>Class. If an object cannot be added to the
 * collection, an IllegalArgumentException is thrown.
 * <p>
 * <strong>Note that TypedMap is not synchronized and is not thread-safe.
 * If you wish to use this map from multiple threads concurrently, you must use
 * appropriate synchronization. The simplest approach is to wrap this map
 * using {@link java.util.Collections#synchronizedMap(Map)}. This class may throw 
 * exceptions when accessed by concurrent threads without synchronization.
 * <p>
 * The returned implementation is Serializable from Commons Collections 3.1.
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * @author Stephen Colebourne
 * @author Matthew Hawthorne
public class TypedMap {

     * Factory method to create a typed map.
     * <p>
     * If there are any elements already in the map being decorated, they
     * are validated.
     * @param map  the map to decorate, must not be null
     * @param keyType  the type to allow as keys, must not be null
     * @param valueType  the type to allow as values, must not be null
     * @throws IllegalArgumentException if list or type is null
     * @throws IllegalArgumentException if the list contains invalid elements
    public static Map decorate(Map map, Class keyType, Class valueType) {
        return new PredicatedMap(

     * Restrictive constructor.
    protected TypedMap() {


Other Commons Collections examples (source code examples)

Here is a short list of links related to this Commons Collections TypedMap.java source code file:

my book on functional programming


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