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'rapiddweller Common' is an open source Java library forked from Databene Commons 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 com.rapiddweller.common.accessor;

import com.rapiddweller.common.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
 *
 * @param  type of the objects to compare
 * @param  type of the value to get from the compared objects and to use for comparison
 * @author Volker Bergmann
 */
public class AccessingComparator implements Comparator {

  private final Accessor accessor;
  private final Comparator comparator;

  /**
   * Instantiates a new Accessing comparator.
   *
   * @param accessor   the accessor
   * @param comparator the 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));
  }
}