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1   package groovy.xml.streamingmarkupsupport;
2   /*
3   
4   Copyright 2004 (C) John Wilson. All Rights Reserved.
5   
6   Redistribution and use of this software and associated documentation
7   ("Software"), with or without modification, are permitted provided
8   that the following conditions are met:
9   
10  1. Redistributions of source code must retain copyright
11     statements and notices.  Redistributions must also contain a
12     copy of this document.
13  
14  2. Redistributions in binary form must reproduce the
15     above copyright notice, this list of conditions and the
16     following disclaimer in the documentation and/or other
17     materials provided with the distribution.
18  
19  3. The name "groovy" must not be used to endorse or promote
20     products derived from this Software without prior written
21     permission of The Codehaus.  For written permission,
22     please contact info@codehaus.org.
23  
24  4. Products derived from this Software may not be called "groovy"
25     nor may "groovy" appear in their names without prior written
26     permission of The Codehaus. "groovy" is a registered
27     trademark of The Codehaus.
28  
29  5. Due credit should be given to The Codehaus -
30     http://groovy.codehaus.org/
31  
32  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
33  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
34  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
36  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43  OF THE POSSIBILITY OF SUCH DAMAGE.
44  
45  */
46  
47  import java.io.IOException;
48  import java.io.OutputStreamWriter;
49  import java.io.Writer;
50  import java.nio.charset.Charset;
51  import java.nio.charset.CharsetEncoder;
52  
53  public class StreamingMarkupWriter extends Writer {
54  	protected final Writer writer;
55    protected final String encoding;
56    protected final CharsetEncoder encoder;
57  	private final Writer bodyWriter =  new Writer() {
58  											/* (non-Javadoc)
59  											 * @see java.io.Writer#close()
60  											 */
61  											public void close() throws IOException {
62  												StreamingMarkupWriter.this.close();
63  											}
64  											
65  											/* (non-Javadoc)
66  											 * @see java.io.Writer#flush()
67  											 */
68  											public void flush() throws IOException {
69  												StreamingMarkupWriter.this.flush();
70  											}
71  		
72  											/* (non-Javadoc)
73  											 * @see java.io.Writer#write(int)
74  											 */
75  											public void write(final int c) throws IOException {
76  												if (!StreamingMarkupWriter.this.encoder.canEncode((char)c)) {
77  													StreamingMarkupWriter.this.writer.write("&#x");
78  													StreamingMarkupWriter.this.writer.write(Integer.toHexString(c));
79  													StreamingMarkupWriter.this.writer.write(';');
80  												} else if (c == '<') {
81  													StreamingMarkupWriter.this.writer.write("&lt;");
82  												} else if (c == '>') {
83  													StreamingMarkupWriter.this.writer.write("&gt;");
84  												} else if (c == '&') {
85  													StreamingMarkupWriter.this.writer.write("&amp;");
86  												} else {
87  													StreamingMarkupWriter.this.writer.write(c);
88  												}
89  											}
90  											
91  											/* (non-Javadoc)
92  											 * @see java.io.Writer#write(char[], int, int)
93  											 */
94  											public void write(final char[] cbuf, int off, int len) throws IOException {
95  												while (len-- > 0){
96  													write(cbuf[off++]);
97  												}
98  											}
99  											
100 											public Writer attributeValue() {
101 												return StreamingMarkupWriter.this.attributeWriter;
102 											}
103 											
104 											public Writer bodyText() {
105 												return bodyWriter;
106 											}
107 											
108 											public Writer unescaped() {
109 												return StreamingMarkupWriter.this;
110 											}
111 										};
112 	
113 	private final Writer attributeWriter =  new Writer() {
114 												/* (non-Javadoc)
115 												 * @see java.io.Writer#close()
116 												 */
117 												public void close() throws IOException {
118 													StreamingMarkupWriter.this.close();
119 												}
120 										
121 												/* (non-Javadoc)
122 												 * @see java.io.Writer#flush()
123 												 */
124 												public void flush() throws IOException {
125 													StreamingMarkupWriter.this.flush();
126 												}
127 		
128 												/* (non-Javadoc)
129 												 * @see java.io.Writer#write(int)
130 												 */
131 												public void write(final int c) throws IOException {
132 													if (c == '\'') {
133 														StreamingMarkupWriter.this.writer.write("&apos;");
134 													} else {
135 														StreamingMarkupWriter.this.bodyWriter.write(c);
136 													}
137 												}
138 												
139 												/* (non-Javadoc)
140 												 * @see java.io.Writer#write(char[], int, int)
141 												 */
142 												public void write(final char[] cbuf, int off, int len) throws IOException {
143 													while (len-- > 0){
144 														write(cbuf[off++]);
145 													}
146 												}
147 												
148 												public Writer attributeValue() {
149 													return attributeWriter;
150 												}
151 												
152 												public Writer bodyText() {
153 													return StreamingMarkupWriter.this.bodyWriter;
154 												}
155 												
156 												public Writer unescaped() {
157 													return StreamingMarkupWriter.this;
158 												}
159 											};
160 
161 		public StreamingMarkupWriter(final Writer writer, final String encoding) {
162 			this.writer = writer;
163       
164       if (encoding != null) {
165         this.encoding = encoding;
166       } else if (writer instanceof OutputStreamWriter) {
167         this.encoding = ((OutputStreamWriter)writer).getEncoding();
168       } else {
169         this.encoding = "US-ASCII";
170       }
171       
172       this.encoder = Charset.forName(this.encoding).newEncoder();
173 		}
174 
175     public StreamingMarkupWriter(final Writer writer) {
176       this(writer, null);
177     }
178     
179 		/* (non-Javadoc)
180 		 * @see java.io.Writer#close()
181 		 */
182 		public void close() throws IOException {
183 			this.writer.close();
184 		}
185 
186 		/* (non-Javadoc)
187 		 * @see java.io.Writer#flush()
188 		 */
189 		public void flush() throws IOException {
190 			this.writer.flush();
191 		}
192 		
193 		/* (non-Javadoc)
194 		 * @see java.io.Writer#write(char[], int, int)
195 		 */
196 		public void write(final char[] cbuf, int off, int len) throws IOException {
197 			this.writer.write(cbuf, off, len);
198 		}
199 		
200 		public Writer attributeValue() {
201 			return this.attributeWriter;
202 		}
203 		
204 		public Writer bodyText() {
205 			return this.bodyWriter;
206 		}
207 		
208 		public Writer unescaped() {
209 			return this;
210 		}
211 	}