/**
 * @license
 * Copyright 2013 Google Inc. 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 foam.dao;

import java.util.Comparator;

import static java.util.Arrays.copyOf;

public class CompoundComparator<T>
    implements Comparator<T>
{
    private final Comparator<T>[] delegates;

    public CompoundComparator(Comparator<T> ... cs) {
      delegates = copyOf(cs, cs.length);
    }

    public int compare(T o1, T o2) {
      for (Comparator<T> c : delegates) {
        int v = c.compare(o1, o2);
        if (v != 0) {
          return v;
        }
      }
      return 0;
    }
}