| /* |
| * 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.commons.io.comparator; |
| |
| import java.io.File; |
| import java.io.Serializable; |
| import java.util.Comparator; |
| |
| /** |
| * Compare the <b>last modified date/time</b> of two files for order |
| * (see {@link File#lastModified()}). |
| * <p> |
| * This comparator can be used to sort lists or arrays of files |
| * by their last modified date/time. |
| * <p> |
| * Example of sorting a list of files using the |
| * {@link #LASTMODIFIED_COMPARATOR} singleton instance: |
| * <pre> |
| * List<File> list = ... |
| * Collections.sort(list, LastModifiedFileComparator.LASTMODIFIED_COMPARATOR); |
| * </pre> |
| * <p> |
| * Example of doing a <i>reverse</i> sort of an array of files using the |
| * {@link #LASTMODIFIED_REVERSE} singleton instance: |
| * <pre> |
| * File[] array = ... |
| * Arrays.sort(array, LastModifiedFileComparator.LASTMODIFIED_REVERSE); |
| * </pre> |
| * <p> |
| * |
| * @version $Revision: 609243 $ $Date: 2008-01-06 00:30:42 +0000 (Sun, 06 Jan 2008) $ |
| * @since Commons IO 1.4 |
| */ |
| public class LastModifiedFileComparator implements Comparator<File>, Serializable { |
| |
| /** Last modified comparator instance */ |
| public static final Comparator<File> LASTMODIFIED_COMPARATOR = new LastModifiedFileComparator(); |
| |
| /** Reverse last modified comparator instance */ |
| public static final Comparator<File> LASTMODIFIED_REVERSE = new ReverseComparator<File>(LASTMODIFIED_COMPARATOR); |
| |
| /** |
| * Compare the last the last modified date/time of two files. |
| * |
| * @param obj1 The first file to compare |
| * @param obj2 The second file to compare |
| * @return a negative value if the first file's lastmodified date/time |
| * is less than the second, zero if the lastmodified date/time are the |
| * same and a positive value if the first files lastmodified date/time |
| * is greater than the second file. |
| * |
| */ |
| public int compare(File file1, File file2) { |
| long result = file1.lastModified() - file2.lastModified(); |
| if (result < 0) { |
| return -1; |
| } else if (result > 0) { |
| return 1; |
| } else { |
| return 0; |
| } |
| } |
| } |