Mercurial > hg > blitz_condensed
comparison src/com/go/trove/io/FileByteData.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.File; | |
57 import java.io.RandomAccessFile; | |
58 import java.io.IOException; | |
59 | |
60 /****************************************************************************** | |
61 * A ByteData implementation that reads the contents of a file. | |
62 * | |
63 * @author Brian S O'Neill | |
64 * @version | |
65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/12/06 <!-- $--> | |
66 */ | |
67 public class FileByteData implements ByteData { | |
68 private static final Object NULL = new Object(); | |
69 | |
70 private File mFile; | |
71 | |
72 // Thread-local reference to a RandomAccessFile. | |
73 private ThreadLocal mRAF = new ThreadLocal(); | |
74 | |
75 public FileByteData(File file) { | |
76 mFile = file; | |
77 // Open here so that if file isn't found, error is logged earlier. | |
78 open(); | |
79 } | |
80 | |
81 public long getByteCount() throws IOException { | |
82 // Keep file open to ensure that length doesn't change between call to | |
83 // getByteCount and writeTo. | |
84 | |
85 RandomAccessFile raf = open(); | |
86 if (raf == null) { | |
87 return 0; | |
88 } | |
89 else { | |
90 return raf.length(); | |
91 } | |
92 } | |
93 | |
94 public void writeTo(OutputStream out) throws IOException { | |
95 RandomAccessFile raf = open(); | |
96 if (raf == null) { | |
97 return; | |
98 } | |
99 | |
100 try { | |
101 long length = raf.length(); | |
102 int bufSize; | |
103 if (length > 4000) { | |
104 bufSize = 4000; | |
105 } | |
106 else { | |
107 bufSize = (int)length; | |
108 } | |
109 | |
110 byte[] inputBuffer = new byte[bufSize]; | |
111 | |
112 raf.seek(0); | |
113 | |
114 int readAmount; | |
115 while ((readAmount = raf.read(inputBuffer, 0, bufSize)) > 0) { | |
116 out.write(inputBuffer, 0, readAmount); | |
117 } | |
118 } | |
119 finally { | |
120 try { | |
121 finalize(); | |
122 } | |
123 catch (IOException e) { | |
124 } | |
125 } | |
126 } | |
127 | |
128 public void reset() throws IOException { | |
129 Object obj = mRAF.get(); | |
130 try { | |
131 if (obj instanceof RandomAccessFile) { | |
132 ((RandomAccessFile)obj).close(); | |
133 } | |
134 } | |
135 finally { | |
136 mRAF.set(null); | |
137 } | |
138 } | |
139 | |
140 protected final void finalize() throws IOException { | |
141 reset(); | |
142 } | |
143 | |
144 private RandomAccessFile open() { | |
145 Object obj = mRAF.get(); | |
146 if (obj instanceof RandomAccessFile) { | |
147 return (RandomAccessFile)obj; | |
148 } | |
149 else if (obj == NULL) { | |
150 return null; | |
151 } | |
152 | |
153 RandomAccessFile raf = null; | |
154 | |
155 try { | |
156 raf = new RandomAccessFile(mFile, "r"); | |
157 mRAF.set(raf); | |
158 } | |
159 catch (IOException e) { | |
160 mRAF.set(NULL); | |
161 Thread t = Thread.currentThread(); | |
162 t.getThreadGroup().uncaughtException(t, e); | |
163 } | |
164 | |
165 return raf; | |
166 } | |
167 } |