DebugOutputStream


1   // Copyright (c) 2003-2007, Jodd Team (jodd.sf.net). All Rights Reserved.
2   
3   package jodd.io;
4   
5   import java.io.FilterOutputStream  ;
6   import java.io.IOException  ;
7   import java.io.OutputStream  ;
8   
9   /**
10   * Output stream used for debugging purposes.
11   */
12  public class DebugOutputStream extends FilterOutputStream   {
13  
14      // ---------------------------------------------------------------- ctors
15  
16      protected boolean passThrough = true;
17  
18      /**
19       * Output stream that debugs to system out.
20       */
21      public DebugOutputStream() {
22          super(System.out);
23      }
24  
25      public DebugOutputStream(OutputStream   out) {
26          super(out);
27      }
28  
29      public DebugOutputStream(boolean passThrough) {
30          super(System.out);
31          this.passThrough = passThrough;
32      }
33  
34      public DebugOutputStream(OutputStream   out, boolean passThrough) {
35          super(out);
36          this.passThrough = passThrough;
37      }
38  
39  
40      // ---------------------------------------------------------------- methods
41  
42      public void close() throws IOException   {
43          super.close();
44      }
45  
46      public void flush() throws IOException   {
47          super.flush();
48      }
49  
50      public void write(int b) throws IOException   {
51          if (passThrough == true) {
52              super.write(b);
53          }
54          dumpByte(b);
55          System.out.println();
56      }
57  
58      public void write(byte b[]) throws IOException   {
59          super.write(b);
60      }
61  
62      public void write(byte b[], int off, int len) throws IOException   {
63          if (passThrough == true) {
64              super.write(b, off, len);
65          }
66          int i = off;
67          int count = len;
68          while (count-- > 0) {
69              dumpByte(b[i++]);
70          }
71          System.out.println();
72      }
73  
74  
75      /**
76       * Dumps single byte to output stream.
77       */
78      protected void dumpByte(int b) {
79          if (passThrough == true) {
80              System.out.print('\t');
81          }
82          if (b < 0) {
83              b += 128;
84          }
85          if (b < 0x10) {
86              System.out.print('0');
87          }
88  
89          System.out.print(' ');      
90          System.out.print(Integer.toHexString(b).toUpperCase());
91      }
92  }
93
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