groovy.util.ClosureComparator Maven / Gradle / Ivy
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package groovy.util;
import groovy.lang.Closure;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
import java.io.Serializable;
import java.util.Comparator;
/**
* A Comparator which uses a closure to compare 2 values being equal
*
* @author James Strachan
*/
public class ClosureComparator implements Comparator, Serializable {
private static final long serialVersionUID = -4593521535656429522L;
Closure closure;
public ClosureComparator(Closure closure) {
this.closure = closure;
}
public int compare(T object1, T object2) {
Object value = closure.call(object1, object2);
return DefaultTypeTransformation.intUnbox(value);
}
}