Mercurial > hg > blitz_condensed
comparison src/com/go/trove/io/FastCharToByteBuffer.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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-1:000000000000 | 0:3dc0c5604566 |
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1 /* ==================================================================== | |
2 * Trove - Copyright (c) 1999-2001 Walt Disney Internet Group | |
3 * ==================================================================== | |
4 * The Tea Software License, Version 1.1 | |
5 * | |
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. | |
7 * | |
8 * Redistribution and use in source and binary forms, with or without | |
9 * modification, are permitted provided that the following conditions | |
10 * are met: | |
11 * | |
12 * 1. Redistributions of source code must retain the above copyright | |
13 * notice, this list of conditions and the following disclaimer. | |
14 * | |
15 * 2. Redistributions in binary form must reproduce the above copyright | |
16 * notice, this list of conditions and the following disclaimer in | |
17 * the documentation and/or other materials provided with the | |
18 * distribution. | |
19 * | |
20 * 3. The end-user documentation included with the redistribution, | |
21 * if any, must include the following acknowledgment: | |
22 * "This product includes software developed by the | |
23 * Walt Disney Internet Group (http://opensource.go.com/)." | |
24 * Alternately, this acknowledgment may appear in the software itself, | |
25 * if and wherever such third-party acknowledgments normally appear. | |
26 * | |
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must | |
28 * not be used to endorse or promote products derived from this | |
29 * software without prior written permission. For written | |
30 * permission, please contact opensource@dig.com. | |
31 * | |
32 * 5. Products derived from this software may not be called "Tea", | |
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", | |
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior | |
35 * written permission of the Walt Disney Internet Group. | |
36 * | |
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED | |
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS | |
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 * ==================================================================== | |
49 * | |
50 * For more information about Tea, please see http://opensource.go.com/. | |
51 */ | |
52 | |
53 package com.go.trove.io; | |
54 | |
55 import java.io.*; | |
56 import java.util.Set; | |
57 import java.util.HashSet; | |
58 | |
59 /****************************************************************************** | |
60 * A CharToByteBuffer implementation that converts ISO-8859-1 encoded | |
61 * characters faster. To force fast conversion, construct FastCharToByteBuffer | |
62 * with ISO-8859-1 as the default encoding. | |
63 * | |
64 * @author Brian S O'Neill | |
65 * @version | |
66 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/06/14 <!-- $--> | |
67 */ | |
68 public class FastCharToByteBuffer implements CharToByteBuffer, Serializable { | |
69 private static final int TEMP_BUF_LEN = 512; | |
70 private static final Set SUPPORTED_ENCODINGS; | |
71 | |
72 static { | |
73 SUPPORTED_ENCODINGS = new HashSet(); | |
74 SUPPORTED_ENCODINGS.add("8859-1"); | |
75 SUPPORTED_ENCODINGS.add("8859_1"); | |
76 SUPPORTED_ENCODINGS.add("iso-8859-1"); | |
77 SUPPORTED_ENCODINGS.add("ISO-8859-1"); | |
78 SUPPORTED_ENCODINGS.add("iso8859_1"); | |
79 SUPPORTED_ENCODINGS.add("ISO8859_1"); | |
80 } | |
81 | |
82 static boolean isSupportedEncoding(String encoding) { | |
83 return SUPPORTED_ENCODINGS.contains(encoding); | |
84 } | |
85 | |
86 private ByteBuffer mBuffer; | |
87 | |
88 private transient byte[] mTempBytes; | |
89 private transient char[] mTempChars; | |
90 | |
91 private CharToByteBuffer mSlowConvertor; | |
92 | |
93 /** | |
94 * @param buffer Buffer that receives the characters converted to bytes. | |
95 */ | |
96 public FastCharToByteBuffer(ByteBuffer buffer) { | |
97 this(buffer, null); | |
98 } | |
99 | |
100 /** | |
101 * @param buffer Buffer that receives the characters converted to bytes. | |
102 * @param defaultEncoding Default character encoding to use if setEncoding | |
103 * is not called. | |
104 */ | |
105 public FastCharToByteBuffer(ByteBuffer buffer, String defaultEncoding) { | |
106 mBuffer = buffer; | |
107 try { | |
108 setEncoding(defaultEncoding); | |
109 } | |
110 catch (IOException e) { | |
111 } | |
112 } | |
113 | |
114 public void setEncoding(String enc) throws IOException { | |
115 drain(); | |
116 if (isSupportedEncoding(enc)) { | |
117 mSlowConvertor = null; | |
118 } | |
119 else { | |
120 mSlowConvertor = new DefaultCharToByteBuffer(mBuffer, enc); | |
121 } | |
122 } | |
123 | |
124 public String getEncoding() throws IOException { | |
125 return mSlowConvertor != null ? | |
126 mSlowConvertor.getEncoding() : "ISO-8859-1"; | |
127 } | |
128 | |
129 public long getBaseByteCount() throws IOException { | |
130 drain(); | |
131 return mBuffer.getBaseByteCount(); | |
132 } | |
133 | |
134 public long getByteCount() throws IOException { | |
135 drain(); | |
136 return mBuffer.getByteCount(); | |
137 } | |
138 | |
139 public void writeTo(OutputStream out) throws IOException { | |
140 drain(); | |
141 mBuffer.writeTo(out); | |
142 } | |
143 | |
144 public void append(byte b) throws IOException { | |
145 drain(); | |
146 mBuffer.append(b); | |
147 } | |
148 | |
149 public void append(byte[] bytes) throws IOException { | |
150 append(bytes, 0, bytes.length); | |
151 } | |
152 | |
153 public void append(byte[] bytes, int offset, int length) | |
154 throws IOException | |
155 { | |
156 if (length != 0) { | |
157 drain(); | |
158 mBuffer.append(bytes, offset, length); | |
159 } | |
160 } | |
161 | |
162 public void appendSurrogate(ByteData s) throws IOException { | |
163 if (s != null) { | |
164 drain(); | |
165 mBuffer.appendSurrogate(s); | |
166 } | |
167 } | |
168 | |
169 public void addCaptureBuffer(ByteBuffer buffer) throws IOException { | |
170 drain(); | |
171 mBuffer.addCaptureBuffer(buffer); | |
172 } | |
173 | |
174 public void removeCaptureBuffer(ByteBuffer buffer) throws IOException { | |
175 drain(); | |
176 mBuffer.removeCaptureBuffer(buffer); | |
177 } | |
178 | |
179 public void append(char c) throws IOException { | |
180 char[] chars = getTempChars(); | |
181 chars[0] = c; | |
182 append(chars, 0, 1); | |
183 } | |
184 | |
185 public void append(char[] chars) throws IOException { | |
186 append(chars, 0, chars.length); | |
187 } | |
188 | |
189 public void append(char[] chars, int offset, int length) | |
190 throws IOException | |
191 { | |
192 if (mSlowConvertor != null) { | |
193 mSlowConvertor.append(chars, offset, length); | |
194 return; | |
195 } | |
196 | |
197 appendFast(chars, offset, length); | |
198 } | |
199 | |
200 public void append(String str) throws IOException { | |
201 append(str, 0, str.length()); | |
202 } | |
203 | |
204 public void append(String str, int offset, int length) throws IOException { | |
205 if (mSlowConvertor != null) { | |
206 mSlowConvertor.append(str, offset, length); | |
207 return; | |
208 } | |
209 | |
210 if (length == 0) { | |
211 return; | |
212 } | |
213 | |
214 char[] tempChars = getTempChars(); | |
215 int bufLen = tempChars.length; | |
216 | |
217 while (length >= bufLen) { | |
218 str.getChars(offset, offset + bufLen, tempChars, 0); | |
219 offset += bufLen; | |
220 length -= bufLen; | |
221 appendFast(tempChars, 0, bufLen); | |
222 } | |
223 | |
224 if (length > 0) { | |
225 str.getChars(offset, offset + length, tempChars, 0); | |
226 appendFast(tempChars, 0, length); | |
227 } | |
228 } | |
229 | |
230 public void reset() throws IOException { | |
231 mBuffer.reset(); | |
232 } | |
233 | |
234 public void drain() throws IOException { | |
235 if (mSlowConvertor != null) { | |
236 mSlowConvertor.drain(); | |
237 } | |
238 } | |
239 | |
240 private void appendFast(char[] chars, int offset, int length) | |
241 throws IOException | |
242 { | |
243 byte[] tempBytes = getTempBytes(); | |
244 int bufLen = tempBytes.length; | |
245 int bi = 0; | |
246 int climit = offset + length; | |
247 | |
248 for (int ci = offset; ci < climit; ci++) { | |
249 tempBytes[bi++] = (byte)chars[ci]; | |
250 if (bi >= bufLen) { | |
251 mBuffer.append(tempBytes, 0, bufLen); | |
252 bi = 0; | |
253 } | |
254 } | |
255 | |
256 if (bi > 0) { | |
257 mBuffer.append(tempBytes, 0, bi); | |
258 } | |
259 } | |
260 | |
261 private byte[] getTempBytes() { | |
262 if (mTempBytes == null) { | |
263 mTempBytes = new byte[TEMP_BUF_LEN]; | |
264 } | |
265 return mTempBytes; | |
266 } | |
267 | |
268 private char[] getTempChars() { | |
269 if (mTempChars == null) { | |
270 mTempChars = new char[TEMP_BUF_LEN]; | |
271 } | |
272 return mTempChars; | |
273 } | |
274 } |