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Commons IO example source code file (DirectoryFileComparator.java)
The Commons IO DirectoryFileComparator.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; /** * Compare two files using the {@link File#isDirectory()} method. * <p> * This comparator can be used to sort lists or arrays by directories and files. * <p> * Example of sorting a list of files/directories using the * {@link #DIRECTORY_COMPARATOR} singleton instance: * <pre> * List<File> list = ... * DirectoryFileComparator.DIRECTORY_COMPARATOR.sort(list); * </pre> * <p> * Example of doing a <i>reverse sort of an array of files/directories using the * {@link #DIRECTORY_REVERSE} singleton instance: * <pre> * File[] array = ... * DirectoryFileComparator.DIRECTORY_REVERSE.sort(array); * </pre> * <p> * * @version $Revision$ $Date$ * @since Commons IO 2.0 */ public class DirectoryFileComparator extends AbstractFileComparator implements Serializable { /** Singleton default comparator instance */ public static final Comparator<File> DIRECTORY_COMPARATOR = new DirectoryFileComparator(); /** Singleton reverse default comparator instance */ public static final Comparator<File> DIRECTORY_REVERSE = new ReverseComparator(DIRECTORY_COMPARATOR); /** * Compare the two files using the {@link File#isDirectory()} method. * * @param file1 The first file to compare * @param file2 The second file to compare * @return the result of calling file1's * {@link File#compareTo(File)} with file2 as the parameter. */ public int compare(File file1, File file2) { return (getType(file1) - getType(file2)); } /** * Convert type to numeric value. * * @param file The file * @return 1 for directories and 2 for files */ private int getType(File file) { if (file.isDirectory()) { return 1; } else { return 2; } } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO DirectoryFileComparator.java source code file: |
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