LastModifiedFileComparator.java

/*
 * The MIT License
 *
 * Copyright (c) 2009-2010, Vincent Sellier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.jvnet.hudson.plugins.backup.utils;

import java.io.File;
import java.util.Comparator;

/**
 * Compare two {@see java.io.File} by their modification date.
 * The most recent is prior.
 * 
 */
public class LastModifiedFileComparator implements Comparator {
    public int compare(Object o1, Object o2) {
        if (! (o1 instanceof File && o2 instanceof File)) {
            throw new IllegalArgumentException("Parameters not File types");
        }
        if (o1 == null || o2 == null) {
            throw new IllegalArgumentException("One parameter is null");
        }
        return (int) (((File) o2).lastModified() - ((File) o1).lastModified());
    }
}