Mercurial > hg > blitz_condensed
comparison src/com/go/trove/io/FileByteBuffer.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) 1999-2000 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.OutputStream; | |
56 import java.io.RandomAccessFile; | |
57 import java.io.IOException; | |
58 import java.util.List; | |
59 import java.util.ArrayList; | |
60 | |
61 /****************************************************************************** | |
62 * A ByteBuffer implementation that can read from an open file or can write | |
63 * to it. This implementation is best suited for temporary byte data that is | |
64 * too large to hold in memory. | |
65 * | |
66 * @author Brian S O'Neill | |
67 * @version | |
68 * <!--$$Revision: 1.1 $--> 5 <!-- $$JustDate:--> 00/12/05 <!-- $--> | |
69 */ | |
70 public class FileByteBuffer implements ByteBuffer { | |
71 private RandomAccessFile mFile; | |
72 private List mSurrogates; | |
73 private List mCaptureBuffers; | |
74 | |
75 /** | |
76 * Creates a FileByteBuffer on a RandomAccessFile. If the file is opened | |
77 * read-only, then the append operations will fail. | |
78 * | |
79 * @param file The file to use as a buffer. | |
80 */ | |
81 public FileByteBuffer(RandomAccessFile file) throws IOException { | |
82 mFile = file; | |
83 file.seek(0); | |
84 } | |
85 | |
86 public long getBaseByteCount() throws IOException { | |
87 return mFile.length(); | |
88 } | |
89 | |
90 public long getByteCount() throws IOException { | |
91 long count = getBaseByteCount(); | |
92 if (mSurrogates == null) { | |
93 return count; | |
94 } | |
95 | |
96 int size = mSurrogates.size(); | |
97 for (int i=0; i<size; i++) { | |
98 count += ((Surrogate)mSurrogates.get(i)).mByteData.getByteCount(); | |
99 } | |
100 | |
101 return count; | |
102 } | |
103 | |
104 public void writeTo(OutputStream out) throws IOException { | |
105 long length = mFile.length(); | |
106 int bufSize; | |
107 if (length > 4000) { | |
108 bufSize = 4000; | |
109 } | |
110 else { | |
111 bufSize = (int)length; | |
112 } | |
113 | |
114 byte[] inputBuffer = new byte[bufSize]; | |
115 | |
116 mFile.seek(0); | |
117 | |
118 if (mSurrogates != null) { | |
119 long currentPos = 0; | |
120 | |
121 int size = mSurrogates.size(); | |
122 for (int i=0; i<size; i++) { | |
123 Surrogate s = (Surrogate)mSurrogates.get(i); | |
124 currentPos = writeTo(inputBuffer, out, currentPos, s.mPos); | |
125 s.mByteData.writeTo(out); | |
126 } | |
127 } | |
128 | |
129 // Write out the rest of the file. | |
130 int readAmount; | |
131 while ((readAmount = mFile.read(inputBuffer, 0, bufSize)) > 0) { | |
132 out.write(inputBuffer, 0, readAmount); | |
133 } | |
134 } | |
135 | |
136 private long writeTo(byte[] inputBuffer, OutputStream out, | |
137 long fromPos, long toPos) throws IOException { | |
138 if (toPos == fromPos) { | |
139 return fromPos; | |
140 } | |
141 | |
142 int bufSize = inputBuffer.length; | |
143 int readAmount; | |
144 | |
145 while (toPos > fromPos) { | |
146 int amount; | |
147 if (bufSize <= (toPos - fromPos)) { | |
148 amount = bufSize; | |
149 } | |
150 else { | |
151 amount = (int)(toPos - fromPos); | |
152 } | |
153 | |
154 while ((readAmount = mFile.read(inputBuffer, 0, amount)) > 0) { | |
155 out.write(inputBuffer, 0, readAmount); | |
156 fromPos += readAmount; | |
157 amount -= readAmount; | |
158 if (amount <= 0) { | |
159 break; | |
160 } | |
161 } | |
162 | |
163 if (readAmount <= 0) { | |
164 break; | |
165 } | |
166 } | |
167 | |
168 return fromPos; | |
169 } | |
170 | |
171 public void append(byte b) throws IOException { | |
172 List captureBuffers; | |
173 if ((captureBuffers = mCaptureBuffers) != null) { | |
174 int size = captureBuffers.size(); | |
175 for (int i=0; i<size; i++) { | |
176 ((ByteBuffer)captureBuffers.get(i)).append(b); | |
177 } | |
178 } | |
179 | |
180 mFile.write(b); | |
181 } | |
182 | |
183 public void append(byte[] bytes) throws IOException { | |
184 mFile.write(bytes); | |
185 } | |
186 | |
187 public void append(byte[] bytes, int offset, int length) | |
188 throws IOException | |
189 { | |
190 List captureBuffers; | |
191 if ((captureBuffers = mCaptureBuffers) != null) { | |
192 int size = captureBuffers.size(); | |
193 for (int i=0; i<size; i++) { | |
194 ((ByteBuffer)captureBuffers.get(i)).append | |
195 (bytes, offset, length); | |
196 } | |
197 } | |
198 | |
199 mFile.write(bytes, offset, length); | |
200 } | |
201 | |
202 public void appendSurrogate(ByteData s) throws IOException { | |
203 if (s == null) { | |
204 return; | |
205 } | |
206 | |
207 List captureBuffers; | |
208 if ((captureBuffers = mCaptureBuffers) != null) { | |
209 int size = captureBuffers.size(); | |
210 for (int i=0; i<size; i++) { | |
211 ((ByteBuffer)captureBuffers.get(i)).appendSurrogate(s); | |
212 } | |
213 } | |
214 | |
215 if (mSurrogates == null) { | |
216 mSurrogates = new ArrayList(); | |
217 } | |
218 | |
219 mSurrogates.add(new Surrogate(s)); | |
220 } | |
221 | |
222 public void addCaptureBuffer(ByteBuffer buffer) { | |
223 List captureBuffers; | |
224 if ((captureBuffers = mCaptureBuffers) == null) { | |
225 captureBuffers = mCaptureBuffers = new ArrayList(); | |
226 } | |
227 captureBuffers.add(buffer); | |
228 } | |
229 | |
230 public void removeCaptureBuffer(ByteBuffer buffer) { | |
231 List captureBuffers; | |
232 if ((captureBuffers = mCaptureBuffers) != null) { | |
233 captureBuffers.remove(buffer); | |
234 } | |
235 } | |
236 | |
237 public void reset() throws IOException { | |
238 List byteDatas; | |
239 int i, size; | |
240 | |
241 if ((byteDatas = mSurrogates) != null) { | |
242 size = byteDatas.size(); | |
243 for (i=0; i<size; i++) { | |
244 ((ByteData)byteDatas.get(i)).reset(); | |
245 } | |
246 } | |
247 | |
248 if ((byteDatas = mCaptureBuffers) != null) { | |
249 size = byteDatas.size(); | |
250 for (i=0; i<size; i++) { | |
251 ((ByteData)byteDatas.get(i)).reset(); | |
252 } | |
253 } | |
254 } | |
255 | |
256 private class Surrogate { | |
257 public final ByteData mByteData; | |
258 public final long mPos; | |
259 | |
260 public Surrogate(ByteData data) throws IOException { | |
261 mByteData = data; | |
262 mPos = mFile.getFilePointer(); | |
263 } | |
264 } | |
265 } |