    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 *   https://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    /**
    045     * Constructs a new instance.
    046     *
    047     * @deprecated Will be private in the next major release.
    048     */
    049    @Deprecated
    050    public FTPFileFilters() {
    051        // empty
    052    }
    053}