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.Serializable;
021    
022    /**
023     * A file filter that always returns true.
024     *
025     * @since 1.0
026     * @version $Id: TrueFileFilter.java 1304058 2012-03-22 21:02:43Z sebb $
027     * @see FileFilterUtils#trueFileFilter()
028     */
029    public class TrueFileFilter implements IOFileFilter, Serializable {
030    
031        /**
032         * Singleton instance of true filter.
033         * @since 1.3
034         */
035        public static final IOFileFilter TRUE = new TrueFileFilter();
036        /**
037         * Singleton instance of true filter.
038         * Please use the identical TrueFileFilter.TRUE constant.
039         * The new name is more JDK 1.5 friendly as it doesn't clash with other
040         * values when using static imports.
041         */
042        public static final IOFileFilter INSTANCE = TRUE;
043    
044        /**
045         * Restrictive consructor.
046         */
047        protected TrueFileFilter() {
048        }
049    
050        /**
051         * Returns true.
052         *
053         * @param file  the file to check (ignored)
054         * @return true
055         */
056        public boolean accept(File file) {
057            return true;
058        }
059    
060        /**
061         * Returns true.
062         *
063         * @param dir  the directory to check (ignored)
064         * @param name  the filename (ignored)
065         * @return true
066         */
067        public boolean accept(File dir, String name) {
068            return true;
069        }
070    
071    }