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 */ 017package org.apache.commons.io.filefilter; 018 019import java.io.File; 020import java.io.Serializable; 021import java.nio.file.FileVisitResult; 022import java.nio.file.Path; 023import java.nio.file.attribute.BasicFileAttributes; 024 025/** 026 * A file filter that always returns true. 027 * <h2>Deprecating Serialization</h2> 028 * <p> 029 * <em>Serialization is deprecated and will be removed in 3.0.</em> 030 * </p> 031 * 032 * @since 1.0 033 * @see FileFilterUtils#trueFileFilter() 034 */ 035public class TrueFileFilter implements IOFileFilter, Serializable { 036 037 private static final String TO_STRING = Boolean.TRUE.toString(); 038 039 private static final long serialVersionUID = 8782512160909720199L; 040 041 /** 042 * Singleton instance of true filter. 043 * 044 * @since 1.3 045 */ 046 public static final IOFileFilter TRUE = new TrueFileFilter(); 047 048 /** 049 * Singleton instance of true filter. Please use the identical TrueFileFilter.TRUE constant. The new name is more 050 * JDK 1.5 friendly as it doesn't clash with other values when using static imports. 051 */ 052 public static final IOFileFilter INSTANCE = TRUE; 053 054 /** 055 * Restrictive constructor. 056 */ 057 protected TrueFileFilter() { 058 } 059 060 /** 061 * Returns true. 062 * 063 * @param file the file to check (ignored) 064 * @return true 065 */ 066 @Override 067 public boolean accept(final File file) { 068 return true; 069 } 070 071 /** 072 * Returns true. 073 * 074 * @param dir the directory to check (ignored) 075 * @param name the file name (ignored) 076 * @return true 077 */ 078 @Override 079 public boolean accept(final File dir, final String name) { 080 return true; 081 } 082 083 /** 084 * Returns true. 085 * @param file the file to check (ignored) 086 * 087 * @return true 088 * @since 2.9.0 089 */ 090 @Override 091 public FileVisitResult accept(final Path file, final BasicFileAttributes attributes) { 092 return FileVisitResult.CONTINUE; 093 } 094 095 @Override 096 public IOFileFilter and(final IOFileFilter fileFilter) { 097 // TRUE AND expression <=> expression 098 return fileFilter; 099 } 100 101 @Override 102 public IOFileFilter negate() { 103 return FalseFileFilter.INSTANCE; 104 } 105 106 @Override 107 public IOFileFilter or(final IOFileFilter fileFilter) { 108 // TRUE OR expression <=> true 109 return INSTANCE; 110 } 111 112 @Override 113 public String toString() { 114 return TO_STRING; 115 } 116}