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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.net.ftp;
19  
20  import java.util.Objects;
21  
22  /**
23   * Implements some simple FTPFileFilter classes.
24   *
25   * @since 2.2
26   */
27  public class FTPFileFilters {
28  
29      /**
30       * Accepts all FTPFile entries, including null.
31       */
32      public static final FTPFileFilter ALL = file -> true;
33  
34      /**
35       * Accepts all non-null FTPFile entries.
36       */
37      public static final FTPFileFilter NON_NULL = Objects::nonNull;
38  
39      /**
40       * Accepts all (non-null) FTPFile directory entries.
41       */
42      public static final FTPFileFilter DIRECTORIES = file -> file != null && file.isDirectory();
43  
44  }