StringOutputStream


1   // Copyright (c) 2003-2007, Jodd Team (jodd.sf.net). All Rights Reserved.
2   
3   package jodd.io;
4   
5   import jodd.util.CharUtil;
6   
7   import java.io.OutputStream  ;
8   import java.io.Serializable  ;
9   
10  /**
11   * Provides an OutputStream to an internal String. Internally converts bytes
12   * to a Strings and stores them in an internal StringBuffer.
13   */
14  public class StringOutputStream extends OutputStream   implements Serializable   {
15      
16      /**
17       * The internal destination StringBuffer.
18       */
19      protected StringBuffer   buf = null;
20  
21      /**
22       * Creates new StringOutputStream, makes a new internal StringBuffer.
23       */
24      public StringOutputStream() {
25          super();
26          buf = new StringBuffer  ();
27      }
28  
29      /**
30       * Returns the content of the internal StringBuffer as a String, the result
31       * of all writing to this OutputStream.
32       *
33       * @return returns the content of the internal StringBuffer
34       */
35      public String   toString() {
36          return buf.toString();
37      }
38  
39      /**
40      * Sets the internal StringBuffer to null.
41      */
42      public void close() {
43          buf = null;
44  
45      }
46  
47      /**
48       * Writes and appends byte array to StringOutputStream.
49       *
50       * @param b      byte array
51       */
52      public void write(byte[] b) {
53          buf.append(CharUtil.toCharArray(b));
54      }
55  
56      /**
57       * Writes and appends a byte array to StringOutputStream.
58       *
59       * @param b      the byte array
60       * @param off    the byte array starting index
61       * @param len    the number of bytes from byte array to write to the stream
62       */
63      public void write(byte[] b, int off, int len) {
64          if ((off < 0) || (len < 0) || (off + len) > b.length) {
65              throw new IndexOutOfBoundsException  ("Parameters out of bounds.");
66          }
67          byte[] bytes = new byte[len];
68          for (int i = 0; i < len; i++) {
69              bytes[i] = b[off];
70              off++;
71          }
72          buf.append(CharUtil.toCharArray(bytes));
73      }
74  
75      /**
76       * Writes and appends a single byte to StringOutputStream.
77       *
78       * @param b      the byte as an int to add
79       */
80      public void write(int b) {
81          buf.append((char)b);
82      }
83  }
84  
85  
86
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