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Commons IO example source code file (NameFileComparator.java)
The Commons IO NameFileComparator.java source code/* * 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; import org.apache.commons.io.IOCase; /** * Compare the <b>names of two files for order (see {@link File#getName()}). * <p> * This comparator can be used to sort lists or arrays of files * by their name either in a case-sensitive, case-insensitive or * system dependant case sensitive way. A number of singleton instances * are provided for the various case sensitivity options (using {@link IOCase}) * and the reverse of those options. * <p> * Example of a <i>case-sensitive file name sort using the * {@link #NAME_COMPARATOR} singleton instance: * <pre> * List<File> list = ... * NameFileComparator.NAME_COMPARATOR.sort(list); * </pre> * <p> * Example of a <i>reverse case-insensitive file name sort using the * {@link #NAME_INSENSITIVE_REVERSE} singleton instance: * <pre> * File[] array = ... * NameFileComparator.NAME_INSENSITIVE_REVERSE.sort(array); * </pre> * <p> * * @version $Revision: 723942 $ $Date: 2008-12-06 01:24:06 +0000 (Sat, 06 Dec 2008) $ * @since Commons IO 1.4 */ public class NameFileComparator extends AbstractFileComparator implements Serializable { /** Case-sensitive name comparator instance (see {@link IOCase#SENSITIVE}) */ public static final Comparator<File> NAME_COMPARATOR = new NameFileComparator(); /** Reverse case-sensitive name comparator instance (see {@link IOCase#SENSITIVE}) */ public static final Comparator<File> NAME_REVERSE = new ReverseComparator(NAME_COMPARATOR); /** Case-insensitive name comparator instance (see {@link IOCase#INSENSITIVE}) */ public static final Comparator<File> NAME_INSENSITIVE_COMPARATOR = new NameFileComparator(IOCase.INSENSITIVE); /** Reverse case-insensitive name comparator instance (see {@link IOCase#INSENSITIVE}) */ public static final Comparator<File> NAME_INSENSITIVE_REVERSE = new ReverseComparator(NAME_INSENSITIVE_COMPARATOR); /** System sensitive name comparator instance (see {@link IOCase#SYSTEM}) */ public static final Comparator<File> NAME_SYSTEM_COMPARATOR = new NameFileComparator(IOCase.SYSTEM); /** Reverse system sensitive name comparator instance (see {@link IOCase#SYSTEM}) */ public static final Comparator<File> NAME_SYSTEM_REVERSE = new ReverseComparator(NAME_SYSTEM_COMPARATOR); /** Whether the comparison is case sensitive. */ private final IOCase caseSensitivity; /** * Construct a case sensitive file name comparator instance. */ public NameFileComparator() { this.caseSensitivity = IOCase.SENSITIVE; } /** * Construct a file name comparator instance with the specified case-sensitivity. * * @param caseSensitivity how to handle case sensitivity, null means case-sensitive */ public NameFileComparator(IOCase caseSensitivity) { this.caseSensitivity = caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity; } /** * Compare the names of two files with the specified case sensitivity. * * @param file1 The first file to compare * @param file2 The second file to compare * @return a negative value if the first file's name * is less than the second, zero if the names are the * same and a positive value if the first files name * is greater than the second file. */ public int compare(File file1, File file2) { return caseSensitivity.checkCompareTo(file1.getName(), file2.getName()); } /** * String representation of this file comparator. * * @return String representation of this file comparator */ @Override public String toString() { return super.toString() + "[caseSensitivity=" + caseSensitivity + "]"; } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO NameFileComparator.java source code file: |
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