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Commons Collections example source code file (TypedCollection.java)

This example Commons Collections source code file (TypedCollection.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, collection, collection, predicatedcollection, predicatedcollection, typedcollection, typedcollection, util

The Commons Collections TypedCollection.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.collection;

import java.util.Collection;

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

/**
 * Decorates a <code>Collection 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 TypedCollection {

    /**
     * Factory method to create a typed collection.
     * <p>
     * If there are any elements already in the collection being decorated, they
     * are validated.
     * 
     * @param coll  the collection to decorate, must not be null
     * @param type  the type to allow into the collection, must not be null
     * @return a new typed collection
     * @throws IllegalArgumentException if collection or type is null
     * @throws IllegalArgumentException if the collection contains invalid elements
     */
    public static Collection decorate(Collection coll, Class type) {
        return new PredicatedCollection(coll, InstanceofPredicate.getInstance(type));
    }
    
    /**
     * Restrictive constructor.
     */
    protected TypedCollection() {
        super();
    }

}

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