1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.util;
20
21 /* ------------------------------------------------------------ */
22 /**
23 * UTF-8 StringBuffer.
24 *
25 * This class wraps a standard {@link java.lang.StringBuffer} and provides methods to append
26 * UTF-8 encoded bytes, that are converted into characters.
27 *
28 * This class is stateful and up to 4 calls to {@link #append(byte)} may be needed before
29 * state a character is appended to the string buffer.
30 *
31 * The UTF-8 decoding is done by this class and no additional buffers or Readers are used.
32 * The UTF-8 code was inspired by http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
33 */
34 public class Utf8StringBuffer extends Utf8Appendable
35 {
36 final StringBuffer _buffer;
37
38 public Utf8StringBuffer()
39 {
40 super(new StringBuffer());
41 _buffer = (StringBuffer)_appendable;
42 }
43
44 public Utf8StringBuffer(int capacity)
45 {
46 super(new StringBuffer(capacity));
47 _buffer = (StringBuffer)_appendable;
48 }
49
50 @Override
51 public int length()
52 {
53 return _buffer.length();
54 }
55
56 @Override
57 public void reset()
58 {
59 super.reset();
60 _buffer.setLength(0);
61 }
62
63 public StringBuffer getStringBuffer()
64 {
65 checkState();
66 return _buffer;
67 }
68
69 @Override
70 public String toString()
71 {
72 checkState();
73 return _buffer.toString();
74 }
75 }