OrderDescriptor.java

/*
 * Copyright 2003-2011 JetBrains s.r.o.
 *
 * 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 jetbrains.mps.aspects;

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

public class OrderDescriptor<T> implements Comparator<T> {
  private List<T> myOrderData;

  public OrderDescriptor(T ... orderData) {
    myOrderData = Arrays.asList(orderData);
  }

  @Override
  public int compare(T d1, T d2) {
    int i1 = myOrderData.indexOf(d1);
    int i2 = myOrderData.indexOf(d2);

    if (i1 == -1 || i2 == -1) return 0;

    return i1 - i2;
  }
}