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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.impl.io;
29  
30  import java.io.InputStream;
31  
32  /**
33   * @since 4.4
34   */
35  public final class EmptyInputStream extends InputStream {
36  
37      public static final EmptyInputStream INSTANCE = new EmptyInputStream();
38  
39      private EmptyInputStream() {
40      }
41  
42      @Override
43      public int available() {
44          return 0;
45      }
46  
47      @Override
48      public void close() {
49      }
50  
51      @Override
52      public void mark(final int readLimit) {
53      }
54  
55      @Override
56      public boolean markSupported() {
57          return true;
58      }
59  
60      @Override
61      public int read() {
62          return -1;
63      }
64  
65      @Override
66      public int read(final byte[] buf) {
67          return -1;
68      }
69  
70      @Override
71      public int read(final byte[] buf, final int off, final int len) {
72          return -1;
73      }
74  
75      @Override
76      public void reset() {
77      }
78  
79      @Override
80      public long skip(final long n) {
81          return 0L;
82      }
83  }
84