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


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 an encoding char-to-byte writer for Java source generation
37  * using the '\\uxxxx' escapes for non-ascii characters.
38  */
39 public class JAVAWriter extends EncodingWriter {
40   private static JAVAWriter _writer = new JAVAWriter();
41   
42   /**
43    * Null-arg constructor for instantiation by com.caucho.vfs.Encoding only.
44    */
45   public JAVAWriter()
46   {
47   }
48
49   /**
50    * Returns the encoding.
51    */
52   public String JavaDoc getJavaEncoding()
53   {
54     return "JAVA";
55   }
56
57   /**
58    * Create a Java source-code writer using on the WriteStream to send bytes.
59    *
60    * @param os the write stream receiving the bytes.
61    * @param javaEncoding the JDK name for the encoding.
62    *
63    * @return the UTF-8 writer.
64    */
65   public EncodingWriter create(String JavaDoc javaEncoding)
66   {
67     return _writer;
68   }
69
70   /**
71    * Writes a character to the output stream with the correct encoding.
72    *
73    * @param ch the character to write.
74    */
75   public void write(OutputStreamWithBuffer os, char ch)
76     throws IOException JavaDoc
77   {
78     if (ch < 0x80)
79       os.write(ch);
80     else {
81       os.write('\\');
82       os.write('u');
83
84       int b = (ch >> 12) & 0xf;
85       os.write(b < 10 ? b + '0' : b + 'a' - 10);
86       b = (ch >> 8) & 0xf;
87       os.write(b < 10 ? b + '0' : b + 'a' - 10);
88       b = (ch >> 4) & 0xf;
89       os.write(b < 10 ? b + '0' : b + 'a' - 10);
90       b = ch & 0xf;
91       os.write(b < 10 ? b + '0' : b + 'a' - 10);
92     }
93   }
94
95   /**
96    * Writes into a character buffer using the correct encoding.
97    *
98    * @param cbuf character array with the data to write.
99    * @param off starting offset into the character array.
100    * @param len the number of characters to write.
101    */
102   public void write(OutputStreamWithBuffer os, char []cbuf, int off, int len)
103     throws IOException JavaDoc
104   {
105     for (int i = 0; i < len; i++) {
106       char ch = cbuf[off + i];
107
108       if (ch < 0x80)
109         os.write(ch);
110       else {
111         os.write('\\');
112         os.write('u');
113
114         int b = (ch >> 12) & 0xf;
115         os.write(b < 10 ? b + '0' : b + 'a' - 10);
116         b = (ch >> 8) & 0xf;
117         os.write(b < 10 ? b + '0' : b + 'a' - 10);
118         b = (ch >> 4) & 0xf;
119         os.write(b < 10 ? b + '0' : b + 'a' - 10);
120         b = ch & 0xf;
121         os.write(b < 10 ? b + '0' : b + 'a' - 10);
122       }
123     }
124   }
125 }
126
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