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annotate src/org/eclipse/jetty/util/Utf8StringBuffer.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 3428c60d7cfc
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util;
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20
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21 /* ------------------------------------------------------------ */
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22 /**
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23 * UTF-8 StringBuffer.
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24 *
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25 * This class wraps a standard {@link java.lang.StringBuffer} and provides methods to append
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26 * UTF-8 encoded bytes, that are converted into characters.
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27 *
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28 * This class is stateful and up to 4 calls to {@link #append(byte)} may be needed before
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29 * state a character is appended to the string buffer.
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30 *
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31 * The UTF-8 decoding is done by this class and no additional buffers or Readers are used.
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32 * The UTF-8 code was inspired by http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
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33 */
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34 public class Utf8StringBuffer extends Utf8Appendable
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35 {
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36 final StringBuffer _buffer;
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37
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38 public Utf8StringBuffer()
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39 {
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40 super(new StringBuffer());
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41 _buffer = (StringBuffer)_appendable;
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42 }
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43
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44 public Utf8StringBuffer(int capacity)
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45 {
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46 super(new StringBuffer(capacity));
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47 _buffer = (StringBuffer)_appendable;
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48 }
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49
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50 @Override
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51 public int length()
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52 {
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53 return _buffer.length();
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54 }
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55
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56 @Override
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57 public void reset()
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58 {
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59 super.reset();
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60 _buffer.setLength(0);
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61 }
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62
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63 public StringBuffer getStringBuffer()
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64 {
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65 checkState();
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66 return _buffer;
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67 }
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68
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69 @Override
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70 public String toString()
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71 {
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72 checkState();
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73 return _buffer.toString();
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74 }
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75 }