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Groovy example source code file (ClosureComparator.java)

This example Groovy source code file (ClosureComparator.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 - Groovy tags/keywords

closure, closure, closurecomparator, closurecomparator, comparator, comparator, object, object, t, util

The Groovy ClosureComparator.java source code

 * Copyright 2003-2007 the original author or authors.
 * Licensed 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package groovy.util;

import groovy.lang.Closure;
import java.util.Comparator;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

 * A Comparator which uses a closure to compare 2 values being equal
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 16873 $
public class ClosureComparator<T> implements Comparator {

    Closure closure;

    public ClosureComparator(Closure closure) {
        this.closure = closure;

    public int compare(T object1, T object2) {
        Object value = closure.call(new Object[] {object1, object2});
        return DefaultTypeTransformation.intUnbox(value);

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