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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.tools.ant.types.resources.comparators;
import java.util.Comparator;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.Resource;
/**
* Abstract Resource Comparator.
* @since Ant 1.7
*/
public abstract class ResourceComparator extends DataType implements Comparator<Resource> {
/**
* Compare two objects.
* @param foo the first Object.
* @param bar the second Object.
* @return a negative integer, zero, or a positive integer as the first
* argument is less than, equal to, or greater than the second.
* @throws ClassCastException if either argument is null.
*/
public final int compare(Resource foo, Resource bar) {
dieOnCircularReference();
ResourceComparator c =
isReference() ? (ResourceComparator) getCheckedRef() : this;
return c.resourceCompare(foo, bar);
}
/**
* Test for equality with this ResourceComparator.
* @param o the Object to compare against.
* @return true if the specified Object equals this one.
*/
public boolean equals(Object o) {
if (isReference()) {
return getCheckedRef().equals(o);
}
if (o == null) {
return false;
}
return o == this || o.getClass().equals(getClass());
}
/**
* Hashcode based on the rules for equality.
* @return a hashcode.
*/
public synchronized int hashCode() {
if (isReference()) {
return getCheckedRef().hashCode();
}
return getClass().hashCode();
}
/**
* Compare two Resources.
* @param foo the first Resource.
* @param bar the second Resource.
* @return a negative integer, zero, or a positive integer as the first
* argument is less than, equal to, or greater than the second.
*/
protected abstract int resourceCompare(Resource foo, Resource bar);
}
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