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Commons Collections example source code file (FactoryTransformer.java)

This example Commons Collections source code file (FactoryTransformer.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

factory, factory, factorytransformer, factorytransformer, illegalargumentexception, io, object, object, serializable, transformer, transformer

The Commons Collections FactoryTransformer.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.functors;

import java.io.Serializable;

import org.apache.commons.collections.Factory;
import org.apache.commons.collections.Transformer;

/**
 * Transformer implementation that calls a Factory and returns the result.
 * 
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 *
 * @author Stephen Colebourne
 */
public class FactoryTransformer implements Transformer, Serializable {

    /** Serial version UID */
    private static final long serialVersionUID = -6817674502475353160L;

    /** The factory to wrap */
    private final Factory iFactory;

    /**
     * Factory method that performs validation.
     * 
     * @param factory  the factory to call, not null
     * @return the <code>factory transformer
     * @throws IllegalArgumentException if the factory is null
     */
    public static Transformer getInstance(Factory factory) {
        if (factory == null) {
            throw new IllegalArgumentException("Factory must not be null");
        }
        return new FactoryTransformer(factory);
    }

    /**
     * Constructor that performs no validation.
     * Use <code>getInstance if you want that.
     * 
     * @param factory  the factory to call, not null
     */
    public FactoryTransformer(Factory factory) {
        super();
        iFactory = factory;
    }

    /**
     * Transforms the input by ignoring the input and returning the result of
     * calling the decorated factory.
     * 
     * @param input  the input object to transform
     * @return the transformed result
     */
    public Object transform(Object input) {
        return iFactory.create();
    }

    /**
     * Gets the factory.
     * 
     * @return the factory
     * @since Commons Collections 3.1
     */
    public Factory getFactory() {
        return iFactory;
    }

}

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