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Commons Collections example source code file (TypedBag.java)

This example Commons Collections source code file (TypedBag.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

bag, bag, class, class, predicatedbag, predicatedbag, typedbag, typedbag

The Commons Collections TypedBag.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.bag;

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

 * Decorates another <code>Bag 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.
 * @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 TypedBag {

     * Factory method to create a typed bag.
     * <p>
     * If there are any elements already in the bag being decorated, they
     * are validated.
     * @param bag  the bag to decorate, must not be null
     * @param type  the type to allow into the bag, must not be null
     * @return a new typed Bag
     * @throws IllegalArgumentException if bag or type is null
     * @throws IllegalArgumentException if the bag contains invalid elements
    public static Bag decorate(Bag bag, Class type) {
        return new PredicatedBag(bag, InstanceofPredicate.getInstance(type));

     * Restrictive constructor.
    protected TypedBag() {


Other Commons Collections examples (source code examples)

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