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Commons Collections example source code file (ForClosure.java)

This example Commons Collections source code file (ForClosure.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

closure, closure, forclosure, forclosure, io, serializable, serializable

The Commons Collections ForClosure.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.Closure;

/**
 * Closure implementation that calls another closure n times, like a for loop.
 * 
 * @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 ForClosure implements Closure, Serializable {

    /** Serial version UID */
    private static final long serialVersionUID = -1190120533393621674L;

    /** The number of times to loop */
    private final int iCount;
    /** The closure to call */
    private final Closure iClosure;

    /**
     * Factory method that performs validation.
     * <p>
     * A null closure or zero count returns the <code>NOPClosure.
     * A count of one returns the specified closure.
     * 
     * @param count  the number of times to execute the closure
     * @param closure  the closure to execute, not null
     * @return the <code>for closure
     */
    public static Closure getInstance(int count, Closure closure) {
        if (count <= 0 || closure == null) {
            return NOPClosure.INSTANCE;
        }
        if (count == 1) {
            return closure;
        }
        return new ForClosure(count, closure);
    }

    /**
     * Constructor that performs no validation.
     * Use <code>getInstance if you want that.
     * 
     * @param count  the number of times to execute the closure
     * @param closure  the closure to execute, not null
     */
    public ForClosure(int count, Closure closure) {
        super();
        iCount = count;
        iClosure = closure;
    }

    /**
     * Executes the closure <code>count times.
     * 
     * @param input  the input object
     */
    public void execute(Object input) {
        for (int i = 0; i < iCount; i++) {
            iClosure.execute(input);
        }
    }

    /**
     * Gets the closure.
     * 
     * @return the closure
     * @since Commons Collections 3.1
     */
    public Closure getClosure() {
        return iClosure;
    }

    /**
     * Gets the count.
     * 
     * @return the count
     * @since Commons Collections 3.1
     */
    public int getCount() {
        return iCount;
    }

}

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