/* 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 org.riotfamily.common.collection;
import java.util.Comparator;
/**
* Comparator that compares two classes by their hierarchy difference to a
* target class.
* <p>
* Example:
* <pre>
* c = new TypeDifferenceComparator(Integer.class);
*
* c.compare(Object.class, Number.class); // returns 1
* c.compare(Integer.class, Number.class); // returns -1
* c.compare(Collection.class, Number.class); // returns Integer.MAX_VALUE - 1
* c.compare(Collection.class, Object.class); // returns Integer.MAX_VALUE - 2
* </pre>
* </p>
*/
public class TypeDifferenceComparator implements Comparator<Class<?>> {
private Class<?> targetClass;
public TypeDifferenceComparator(Class<?> targetClass) {
this.targetClass = targetClass;
}
public int compare(Class<?> class1, Class<?> class2) {
return TypeComparatorUtils.compare(class1, class2, targetClass);
}
}