001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.io.filefilter; 018 019 import java.io.File; 020 import java.io.FileFilter; 021 import java.io.FilenameFilter; 022 import java.io.Serializable; 023 024 /** 025 * This class turns a Java FileFilter or FilenameFilter into an IO FileFilter. 026 * 027 * @since 1.0 028 * @version $Id: DelegateFileFilter.java 1304052 2012-03-22 20:55:29Z ggregory $ 029 * 030 * @see FileFilterUtils#asFileFilter(FileFilter) 031 * @see FileFilterUtils#asFileFilter(FilenameFilter) 032 */ 033 public class DelegateFileFilter extends AbstractFileFilter implements Serializable { 034 035 /** The Filename filter */ 036 private final FilenameFilter filenameFilter; 037 /** The File filter */ 038 private final FileFilter fileFilter; 039 040 /** 041 * Constructs a delegate file filter around an existing FilenameFilter. 042 * 043 * @param filter the filter to decorate 044 */ 045 public DelegateFileFilter(FilenameFilter filter) { 046 if (filter == null) { 047 throw new IllegalArgumentException("The FilenameFilter must not be null"); 048 } 049 this.filenameFilter = filter; 050 this.fileFilter = null; 051 } 052 053 /** 054 * Constructs a delegate file filter around an existing FileFilter. 055 * 056 * @param filter the filter to decorate 057 */ 058 public DelegateFileFilter(FileFilter filter) { 059 if (filter == null) { 060 throw new IllegalArgumentException("The FileFilter must not be null"); 061 } 062 this.fileFilter = filter; 063 this.filenameFilter = null; 064 } 065 066 /** 067 * Checks the filter. 068 * 069 * @param file the file to check 070 * @return true if the filter matches 071 */ 072 @Override 073 public boolean accept(File file) { 074 if (fileFilter != null) { 075 return fileFilter.accept(file); 076 } else { 077 return super.accept(file); 078 } 079 } 080 081 /** 082 * Checks the filter. 083 * 084 * @param dir the directory 085 * @param name the filename in the directory 086 * @return true if the filter matches 087 */ 088 @Override 089 public boolean accept(File dir, String name) { 090 if (filenameFilter != null) { 091 return filenameFilter.accept(dir, name); 092 } else { 093 return super.accept(dir, name); 094 } 095 } 096 097 /** 098 * Provide a String representaion of this file filter. 099 * 100 * @return a String representaion 101 */ 102 @Override 103 public String toString() { 104 String delegate = fileFilter != null ? fileFilter.toString() : filenameFilter.toString(); 105 return super.toString() + "(" + delegate + ")"; 106 } 107 108 }