14ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira/* 24ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Licensed to the Apache Software Foundation (ASF) under one or more 34ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * contributor license agreements. See the NOTICE file distributed with 44ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * this work for additional information regarding copyright ownership. 54ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * The ASF licenses this file to You under the Apache License, Version 2.0 64ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * (the "License"); you may not use this file except in compliance with 74ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * the License. You may obtain a copy of the License at 84ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * 94ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * http://www.apache.org/licenses/LICENSE-2.0 104ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * 114ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Unless required by applicable law or agreed to in writing, software 124ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * distributed under the License is distributed on an "AS IS" BASIS, 134ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 144ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * See the License for the specific language governing permissions and 154ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * limitations under the License. 164ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira */ 174ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereirapackage org.apache.commons.io.comparator; 184ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira 194ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereiraimport java.io.File; 204ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereiraimport java.io.Serializable; 214ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereiraimport java.util.Comparator; 224ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira 234ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira/** 244ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Compare the <b>last modified date/time</b> of two files for order 254ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * (see {@link File#lastModified()}). 264ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * <p> 274ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * This comparator can be used to sort lists or arrays of files 284ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * by their last modified date/time. 294ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * <p> 304ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Example of sorting a list of files using the 314ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * {@link #LASTMODIFIED_COMPARATOR} singleton instance: 324ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * <pre> 334ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * List<File> list = ... 344ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Collections.sort(list, LastModifiedFileComparator.LASTMODIFIED_COMPARATOR); 354ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * </pre> 364ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * <p> 374ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Example of doing a <i>reverse</i> sort of an array of files using the 384ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * {@link #LASTMODIFIED_REVERSE} singleton instance: 394ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * <pre> 404ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * File[] array = ... 414ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Arrays.sort(array, LastModifiedFileComparator.LASTMODIFIED_REVERSE); 424ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * </pre> 434ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * <p> 444ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * 454ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * @version $Revision: 609243 $ $Date: 2008-01-06 00:30:42 +0000 (Sun, 06 Jan 2008) $ 464ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * @since Commons IO 1.4 474ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira */ 484ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereirapublic class LastModifiedFileComparator implements Comparator<File>, Serializable { 494ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira 504ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira /** Last modified comparator instance */ 514ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira public static final Comparator<File> LASTMODIFIED_COMPARATOR = new LastModifiedFileComparator(); 524ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira 534ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira /** Reverse last modified comparator instance */ 544ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira public static final Comparator<File> LASTMODIFIED_REVERSE = new ReverseComparator<File>(LASTMODIFIED_COMPARATOR); 554ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira 564ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira /** 574ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * Compare the last the last modified date/time of two files. 584ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * 594ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * @param obj1 The first file to compare 604ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * @param obj2 The second file to compare 614ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * @return a negative value if the first file's lastmodified date/time 624ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * is less than the second, zero if the lastmodified date/time are the 634ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * same and a positive value if the first files lastmodified date/time 644ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * is greater than the second file. 654ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira * 664ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira */ 674ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira public int compare(File file1, File file2) { 684ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira long result = file1.lastModified() - file2.lastModified(); 694ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira if (result < 0) { 704ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira return -1; 714ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira } else if (result > 0) { 724ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira return 1; 734ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira } else { 744ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira return 0; 754ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira } 764ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira } 774ebb916ddca5f59d4f854f104fca0de6e0dda706Mindy Pereira} 78