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 StringBuilder.
24 *
25 * This class wraps a standard {@link java.lang.StringBuilder} 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 */
35 public class Utf8StringBuilder extends Utf8Appendable
36 {
37 final StringBuilder _buffer;
38
39 public Utf8StringBuilder()
40 {
41 super(new StringBuilder());
42 _buffer=(StringBuilder)_appendable;
43 }
44
45 public Utf8StringBuilder(int capacity)
46 {
47 super(new StringBuilder(capacity));
48 _buffer=(StringBuilder)_appendable;
49 }
50
51 @Override
52 public int length()
53 {
54 return _buffer.length();
55 }
56
57 @Override
58 public void reset()
59 {
60 super.reset();
61 _buffer.setLength(0);
62 }
63
64 public StringBuilder getStringBuilder()
65 {
66 checkState();
67 return _buffer;
68 }
69
70 @Override
71 public String toString()
72 {
73 checkState();
74 return _buffer.toString();
75 }
76
77
78 }