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Java > Open Source Codes > com > caucho > vfs > i18n > ISO8859_1Writer


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.vfs.i18n;
30
31 import com.caucho.vfs.OutputStreamWithBuffer;
32
33 import java.io.IOException JavaDoc;
34
35 /**
36  * Implements the ISO-8859-1 EncodingWriter factory.
37  */
38 public final class ISO8859_1Writer extends EncodingWriter {
39   private final static ISO8859_1Writer _writer = new ISO8859_1Writer();
40
41   /**
42    * Null-arg constructor for instantiation by com.caucho.vfs.Encoding only.
43    */
44   public ISO8859_1Writer()
45   {
46   }
47   
48   /**
49    * Returns the Java encoding for the writer.
50    */
51   public String JavaDoc getJavaEncoding()
52   {
53     return "ISO8859_1";
54   }
55
56   /**
57    * Returns null, since WriteStream handles ISO-8859-1 directly.
58    *
59    * @return null for ISO-8859-1
60    */
61   public EncodingWriter create(String JavaDoc javaEncoding)
62   {
63     return _writer;
64   }
65
66   /**
67    * Returns null, since WriteStream handles ISO-8859-1 directly.
68    *
69    * @return null for ISO-8859-1
70    */
71   public EncodingWriter create()
72   {
73     return _writer;
74   }
75
76   /**
77    * Returns the writer.
78    */
79   public static EncodingWriter getStaticWriter()
80   {
81     return _writer;
82   }
83   
84   /**
85    * Writes a character to the output stream with the correct encoding.
86    *
87    * @param ch the character to write.
88    */
89   public void write(OutputStreamWithBuffer os, char ch)
90     throws IOException JavaDoc
91   {
92     os.write(ch);
93   }
94
95   /**
96    * Writes a character buffer using the correct encoding.
97    *
98    * @param cbuf character buffer receiving the data.
99    * @param off starting offset into the buffer.
100    * @param len number of characters to write
101    */
102   public void write(OutputStreamWithBuffer os,
103             char []cBuf, int cOffset, int cLength)
104     throws IOException JavaDoc
105   {
106     byte []bBuf = os.getBuffer();
107     int bOffset = os.getBufferOffset();
108     int bEnd = bBuf.length;
109
110     // int cEnd = cOffset + cLength;
111
112     while (cLength > 0) {
113       int sublen = bEnd - bOffset;
114       if (cLength < sublen)
115     sublen = cLength;
116
117       for (int i = 0; i < sublen; i++) {
118     bBuf[bOffset + i] = (byte) cBuf[cOffset + i];
119       }
120
121       bOffset += sublen;
122       cOffset += sublen;
123       cLength -= sublen;
124       
125       if (bOffset == bEnd) {
126     bBuf = os.nextBuffer(bOffset);
127     bOffset = os.getBufferOffset();
128     bEnd = bBuf.length;
129       }
130     }
131
132     os.setBufferOffset(bOffset);
133   }
134 }
135
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