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1   package org.apache.commons.jcs3.admin;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.io.IOException;
23  import java.io.OutputStream;
24  
25  /**
26   * Keeps track of the number of bytes written to it, but doesn't write them anywhere.
27   */
28  public class CountingOnlyOutputStream
29      extends OutputStream
30  {
31      /** number of bytes passed through */
32      private int count; // TODO should this be long?
33  
34      /**
35       * count as we write.
36       * <p>
37       * @param b
38       * @throws IOException
39       */
40      @Override
41      public void write( final byte[] b )
42          throws IOException
43      {
44          this.count += b.length;
45      }
46  
47      /**
48       * count as we write.
49       * <p>
50       * @param b
51       * @param off
52       * @param len
53       * @throws IOException
54       */
55      @Override
56      public void write( final byte[] b, final int off, final int len )
57          throws IOException
58      {
59          this.count += len;
60      }
61  
62      /**
63       * count as we write.
64       * <p>
65       * @param b
66       * @throws IOException
67       */
68      @Override
69      public void write( final int b )
70          throws IOException
71      {
72          this.count++;
73      }
74  
75      /**
76       * The number of bytes that have passed through this stream.
77       * <p>
78       * @return int
79       */
80      public int getCount()
81      {
82          return this.count;
83      }
84  }