MostToLeastDerivedPlaceTypeComparator.java

/*
 * Copyright 2010 Google Inc.
 * 
 * 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.google.gwt.place.rebind;

import com.google.gwt.core.ext.typeinfo.JClassType;

import java.util.Comparator;

/**
 * Sorts types from most derived to least derived, falling back to alphabetical
 * sorting.
 */
public class MostToLeastDerivedPlaceTypeComparator implements
    Comparator<JClassType> {
  public int compare(JClassType o1, JClassType o2) {
    if (o1.equals(o2)) {
      return 0;
    }
    if (o1.isAssignableFrom(o2)) {
      return 1;
    }
    if (o1.isAssignableTo(o2)) {
      return -1;
    }
    return o1.getQualifiedSourceName().compareTo(o2.getQualifiedSourceName());
  }
}