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1
55 package org.apache.avalon.framework.configuration;
56
57 import java.io.File  ;
58 import java.io.FileOutputStream ;
59 import java.io.IOException ;
60 import java.io.OutputStream ;
61 import java.io.StringWriter ;
62 import java.net.URL ;
63 import java.util.Properties ;
64 import javax.xml.transform.OutputKeys ;
65 import javax.xml.transform.Result ;
66 import javax.xml.transform.TransformerFactory ;
67 import javax.xml.transform.sax.SAXTransformerFactory ;
68 import javax.xml.transform.sax.TransformerHandler ;
69 import javax.xml.transform.stream.StreamResult ;
70 import org.xml.sax.ContentHandler ;
71 import org.xml.sax.SAXException ;
72 import org.xml.sax.helpers.AttributesImpl ;
73 import org.xml.sax.helpers.NamespaceSupport ;
74
75
81 public class DefaultConfigurationSerializer
82 {
83 private SAXTransformerFactory m_tfactory;
84 private Properties m_format = new Properties ();
85
86
91 public void setIndent( boolean indent )
92 {
93 if( indent )
94 {
95 m_format.put( OutputKeys.INDENT, "yes" );
96 }
97 else
98 {
99 m_format.put( OutputKeys.INDENT, "no" );
100 }
101 }
102
103
108 protected ContentHandler createContentHandler( final Result result )
109 {
110 try
111 {
112 TransformerHandler handler = getTransformerFactory().newTransformerHandler();
113
114 m_format.put( OutputKeys.METHOD, "xml" );
115 handler.setResult( result );
116 handler.getTransformer().setOutputProperties( m_format );
117
118 return handler;
119 }
120 catch( final Exception e )
121 {
122 throw new RuntimeException ( e.toString() );
123 }
124 }
125
126
131 protected SAXTransformerFactory getTransformerFactory()
132 {
133 if( m_tfactory == null )
134 {
135 m_tfactory = (SAXTransformerFactory )TransformerFactory.newInstance();
136 }
137
138 return m_tfactory;
139 }
140
141
148 public void serialize( final ContentHandler handler, final Configuration source )
149 throws SAXException , ConfigurationException
150 {
151 handler.startDocument();
152 serializeElement( handler, new NamespaceSupport (), source );
153 handler.endDocument();
154 }
155
156
164 protected void serializeElement( final ContentHandler handler,
165 final NamespaceSupport namespaceSupport,
166 final Configuration element )
167 throws SAXException , ConfigurationException
168 {
169 namespaceSupport.pushContext();
170
171 AttributesImpl attr = new AttributesImpl ();
172 String [] attrNames = element.getAttributeNames();
173
174 if( null != attrNames )
175 {
176 for( int i = 0; i < attrNames.length; i++ )
177 {
178 attr.addAttribute( "", attrNames[ i ], attrNames[ i ], "CDATA", element.getAttribute( attrNames[ i ], "" ) );
184 }
185 }
186
187 final String nsURI = element.getNamespace();
188 String nsPrefix = "";
189
190 if( element instanceof AbstractConfiguration )
191 {
192 nsPrefix = ( (AbstractConfiguration)element ).getPrefix();
193 }
194
196 boolean nsWasDeclared = false;
197
198 final String existingURI = namespaceSupport.getURI( nsPrefix );
199
200 if( existingURI == null || !existingURI.equals( nsURI ) )
203 {
204 nsWasDeclared = true;
205 if( nsPrefix.equals( "" ) && nsURI.equals( "" ) )
206 {
207 }
209 else if( nsPrefix.equals( "" ) )
210 {
211 attr.addAttribute( "", "xmlns", "xmlns", "CDATA", nsURI );
213 }
214 else
215 {
216 attr.addAttribute( "", "xmlns:" + nsPrefix, "xmlns:" + nsPrefix, "CDATA", nsURI );
218 }
219 handler.startPrefixMapping( nsPrefix, nsURI );
220 namespaceSupport.declarePrefix( nsPrefix, nsURI );
221 }
222
223 String localName = element.getName();
224 String qName = element.getName();
225 if( nsPrefix == null || nsPrefix.length() == 0 )
226 {
227 qName = localName;
228 }
229 else
230 {
231 qName = nsPrefix + ":" + localName;
232 }
233
234 handler.startElement( nsURI, localName, qName, attr );
235
236 String value = element.getValue( null );
237
238 if( null == value )
239 {
240 Configuration[] children = element.getChildren();
241
242 for( int i = 0; i < children.length; i++ )
243 {
244 serializeElement( handler, namespaceSupport, children[ i ] );
245 }
246 }
247 else
248 {
249 handler.characters( value.toCharArray(), 0, value.length() );
250 }
251
252 handler.endElement( nsURI, localName, qName );
253
254 if( nsWasDeclared )
255 {
256 handler.endPrefixMapping( nsPrefix );
257 }
258
259 namespaceSupport.popContext();
260 }
261
262
270 public void serializeToFile( final String filename, final Configuration source )
271 throws SAXException , IOException , ConfigurationException
272 {
273 serializeToFile( new File ( filename ), source );
274 }
275
276
284 public void serializeToFile( final File file, final Configuration source )
285 throws SAXException , IOException , ConfigurationException
286 {
287 OutputStream outputStream = null;
288 try
289 {
290 outputStream = new FileOutputStream ( file );
291 serialize( outputStream, source );
292 }
293 finally
294 {
295 if( outputStream != null )
296 {
297 outputStream.close();
298 }
299 }
300 }
301
302
310 public void serialize( final OutputStream outputStream, final Configuration source )
311 throws SAXException , IOException , ConfigurationException
312 {
313 serialize( createContentHandler( new StreamResult ( outputStream ) ), source );
314 }
315
316
325 public void serialize( final String uri, final Configuration source )
326 throws SAXException , IOException , ConfigurationException
327 {
328 OutputStream outputStream = null;
329 try
330 {
331 outputStream = new URL ( uri ).openConnection().getOutputStream();
332 serialize( outputStream, source );
333 }
334 finally
335 {
336 if( outputStream != null )
337 {
338 outputStream.close();
339 }
340 }
341 }
342
343
350 public String serialize( final Configuration source )
351 throws SAXException , ConfigurationException
352 {
353 final StringWriter writer = new StringWriter ();
354
355 serialize( createContentHandler( new StreamResult ( writer ) ), source );
356
357 return writer.toString();
358 }
359 }
360 |
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