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 */
018
019package org.apache.commons.net.ftp;
020
021import java.util.Objects;
022
023/**
024 * Implements some simple FTPFileFilter classes.
025 *
026 * @since 2.2
027 */
028public class FTPFileFilters {
029
030    /**
031     * Accepts all FTPFile entries, including null.
032     */
033    public static final FTPFileFilter ALL = file -> true;
034
035    /**
036     * Accepts all non-null FTPFile entries.
037     */
038    public static final FTPFileFilter NON_NULL = Objects::nonNull;
039
040    /**
041     * Accepts all (non-null) FTPFile directory entries.
042     */
043    public static final FTPFileFilter DIRECTORIES = file -> file != null && file.isDirectory();
044
045}