org.springframework.core.OrderComparator Maven / Gradle / Ivy
/*
* Copyright 2002-2004 the original author or authors.
*
* 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.springframework.core;
import java.util.Comparator;
/**
* Comparator implementation for Ordered objects,
* sorting by order value ascending (resp. by priority descending).
*
* Non-Ordered objects are treated as greatest order values,
* thus ending up at the end of the list, in arbitrary order
* (just like same order values of Ordered objects).
*
* @author Juergen Hoeller
* @since 07.04.2003
* @see Ordered
*/
public class OrderComparator implements Comparator {
public int compare(Object o1, Object o2) {
int i1 = (o1 instanceof Ordered ? ((Ordered) o1).getOrder() : Integer.MAX_VALUE);
int i2 = (o2 instanceof Ordered ? ((Ordered) o2).getOrder() : Integer.MAX_VALUE);
// direct evaluation instead of Integer.compareTo to avoid unnecessary object creation
if (i1 < i2)
return -1;
else if (i1 > i2)
return 1;
else
return 0;
}
}