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
018package org.apache.commons.net.ftp;
019
020import java.util.Objects;
021
022/**
023 * Implements some simple FTPFileFilter classes.
024 *
025 * @since 2.2
026 */
027public class FTPFileFilters {
028
029    /**
030     * Accepts all FTPFile entries, including null.
031     */
032    public static final FTPFileFilter ALL = file -> true;
033
034    /**
035     * Accepts all non-null FTPFile entries.
036     */
037    public static final FTPFileFilter NON_NULL = Objects::nonNull;
038
039    /**
040     * Accepts all (non-null) FTPFile directory entries.
041     */
042    public static final FTPFileFilter DIRECTORIES = file -> file != null && file.isDirectory();
043
044}