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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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,
 * 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.databene.commons.accessor;

import org.databene.commons.Accessor;

import java.util.Comparator;

/**
 * Compares to objects by the values returned from an Accessor that is applied to them.
 * Created: 23.02.2006 18:57:09
 * @author Volker Bergmann
 * @param  type of the objects to compare
 * @param  type of the value to get from the compared objects and to use for comparison 
 */
public class AccessingComparator implements Comparator {

    private Accessor accessor;
    private Comparator comparator;

    public AccessingComparator(Accessor accessor, Comparator comparator) {
        this.accessor = accessor;
        this.comparator = comparator;
    }

    @Override
	public int compare(C o1, C o2) {
        return comparator.compare(accessor.getValue(o1), accessor.getValue(o2));
    }
}