    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;
    021
    022/**
    023 * A file filter that always returns true.
    024 *
    025 * @since 1.0
    026 *
    027 * @see FileFilterUtils#trueFileFilter()
    028 */
    029public class TrueFileFilter implements IOFileFilter, Serializable {
    030
    031    private static final long serialVersionUID = 8782512160909720199L;
    032    /**
    033     * Singleton instance of true filter.
    034     * @since 1.3
    035     */
    036    public static final IOFileFilter TRUE = new TrueFileFilter();
    037    /**
    038     * Singleton instance of true filter.
    039     * Please use the identical TrueFileFilter.TRUE constant.
    040     * The new name is more JDK 1.5 friendly as it doesn't clash with other
    041     * values when using static imports.
    042     */
    043    public static final IOFileFilter INSTANCE = TRUE;
    044
    045    /**
    046     * Restrictive constructor.
    047     */
    048    protected TrueFileFilter() {
    049    }
    050
    051    /**
    052     * Returns true.
    053     *
    054     * @param file  the file to check (ignored)
    055     * @return true
    056     */
    057    @Override
    058    public boolean accept(final File file) {
    059        return true;
    060    }
    061
    062    /**
    063     * Returns true.
    064     *
    065     * @param dir  the directory to check (ignored)
    066     * @param name  the file name (ignored)
    067     * @return true
    068     */
    069    @Override
    070    public boolean accept(final File dir, final String name) {
    071        return true;
    072    }
    073
    074}