| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| EmptyFileFilter |
|
| 2.5;2.5 |
| 1 | /* | |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
| 3 | * contributor license agreements. See the NOTICE file distributed with | |
| 4 | * this work for additional information regarding copyright ownership. | |
| 5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
| 6 | * (the "License"); you may not use this file except in compliance with | |
| 7 | * the License. You may obtain a copy of the License at | |
| 8 | * | |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 | * | |
| 11 | * Unless required by applicable law or agreed to in writing, software | |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 | * See the License for the specific language governing permissions and | |
| 15 | * limitations under the License. | |
| 16 | */ | |
| 17 | package org.apache.commons.io.filefilter; | |
| 18 | ||
| 19 | import java.io.File; | |
| 20 | import java.io.Serializable; | |
| 21 | ||
| 22 | /** | |
| 23 | * This filter accepts files or directories that are empty. | |
| 24 | * <p> | |
| 25 | * If the <code>File</code> is a directory it checks that | |
| 26 | * it contains no files. | |
| 27 | * <p> | |
| 28 | * Example, showing how to print out a list of the | |
| 29 | * current directory's empty files/directories: | |
| 30 | * | |
| 31 | * <pre> | |
| 32 | * File dir = new File("."); | |
| 33 | * String[] files = dir.list( EmptyFileFilter.EMPTY ); | |
| 34 | * for ( int i = 0; i < files.length; i++ ) { | |
| 35 | * System.out.println(files[i]); | |
| 36 | * } | |
| 37 | * </pre> | |
| 38 | * | |
| 39 | * <p> | |
| 40 | * Example, showing how to print out a list of the | |
| 41 | * current directory's non-empty files/directories: | |
| 42 | * | |
| 43 | * <pre> | |
| 44 | * File dir = new File("."); | |
| 45 | * String[] files = dir.list( EmptyFileFilter.NOT_EMPTY ); | |
| 46 | * for ( int i = 0; i < files.length; i++ ) { | |
| 47 | * System.out.println(files[i]); | |
| 48 | * } | |
| 49 | * </pre> | |
| 50 | * | |
| 51 | * @since 1.3 | |
| 52 | * @version $Id: EmptyFileFilter.java 1471767 2013-04-24 23:24:19Z sebb $ | |
| 53 | */ | |
| 54 | public class EmptyFileFilter extends AbstractFileFilter implements Serializable { | |
| 55 | ||
| 56 | /** Singleton instance of <i>empty</i> filter */ | |
| 57 | 1 | public static final IOFileFilter EMPTY = new EmptyFileFilter(); |
| 58 | ||
| 59 | /** Singleton instance of <i>not-empty</i> filter */ | |
| 60 | 1 | public static final IOFileFilter NOT_EMPTY = new NotFileFilter(EMPTY); |
| 61 | ||
| 62 | /** | |
| 63 | * Restrictive consructor. | |
| 64 | */ | |
| 65 | 1 | protected EmptyFileFilter() { |
| 66 | 1 | } |
| 67 | ||
| 68 | /** | |
| 69 | * Checks to see if the file is empty. | |
| 70 | * | |
| 71 | * @param file the file or directory to check | |
| 72 | * @return {@code true} if the file or directory | |
| 73 | * is <i>empty</i>, otherwise {@code false}. | |
| 74 | */ | |
| 75 | @Override | |
| 76 | public boolean accept(final File file) { | |
| 77 | 16 | if (file.isDirectory()) { |
| 78 | 8 | final File[] files = file.listFiles(); |
| 79 | 8 | return files == null || files.length == 0; |
| 80 | } else { | |
| 81 | 8 | return file.length() == 0; |
| 82 | } | |
| 83 | } | |
| 84 | ||
| 85 | } |