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  * Copyright 2006-2007 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
Comparator to sort resources by the file last modified time.

Dave Syer
public class LastModifiedResourceComparator implements Comparator<Resource> {

Compare the two resources by last modified time, so that a sorted list of resources will have oldest first.

java.lang.IllegalArgumentException if one of the resources doesn't exist or its last modified date cannot be determined
See also:,java.lang.Object)
	public int compare(Resource r1Resource r2) {
		Assert.isTrue(r1.exists(), "Resource does not exist: " + r1);
		Assert.isTrue(r2.exists(), "Resource does not exist: " + r2);
		try {
			long diff = r1.getFile().lastModified() - r2.getFile().lastModified();
			return diff > 0 ? 1 : diff < 0 ? -1 : 0;
		catch (IOException e) {
			throw new IllegalArgumentException("Resource modification times cannot be determined (unexpected)."e);
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