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55 package org.apache.avalon.framework.configuration;
56
57 import java.util.ArrayList  ;
58 import java.util.BitSet ;
59 import java.util.Iterator ;
60 import org.xml.sax.Attributes ;
61 import org.xml.sax.Locator ;
62 import org.xml.sax.SAXException ;
63 import org.xml.sax.SAXParseException ;
64 import org.xml.sax.helpers.AttributesImpl ;
65 import org.xml.sax.helpers.NamespaceSupport ;
66
67
74 public class NamespacedSAXConfigurationHandler
75 extends SAXConfigurationHandler
76 {
77
81 private static final int EXPECTED_DEPTH = 5;
82 private final ArrayList m_elements = new ArrayList ( EXPECTED_DEPTH );
83 private final ArrayList m_prefixes = new ArrayList ( EXPECTED_DEPTH );
84 private final ArrayList m_values = new ArrayList ( EXPECTED_DEPTH );
85
89 private final BitSet m_preserveSpace = new BitSet ();
90 private Configuration m_configuration;
91 private Locator m_locator;
92 private NamespaceSupport m_namespaceSupport = new NamespaceSupport ();
93
94
99 public Configuration getConfiguration()
100 {
101 return m_configuration;
102 }
103
104
107 public void clear()
108 {
109 m_elements.clear();
110 Iterator i = m_prefixes.iterator();
111 while( i.hasNext() )
112 {
113 ( (ArrayList )i.next() ).clear();
114 }
115 m_prefixes.clear();
116 m_values.clear();
117 m_locator = null;
118 }
119
120
125 public void setDocumentLocator( final Locator locator )
126 {
127 m_locator = locator;
128 }
129
130
135 public void startDocument()
136 throws SAXException
137 {
138 m_namespaceSupport.reset();
139 super.startDocument();
140 }
141
142
147 public void endDocument()
148 throws SAXException
149 {
150 super.endDocument();
151 m_namespaceSupport.reset();
152 }
153
154
162 public void characters( final char[] ch, int start, int end )
163 throws SAXException
164 {
165 final int depth = m_values.size() - 1;
170 final StringBuffer valueBuffer = (StringBuffer )m_values.get( depth );
171 valueBuffer.append( ch, start, end );
172 }
173
174
182 public void endElement( final String namespaceURI,
183 final String localName,
184 final String rawName )
185 throws SAXException
186 {
187 final int depth = m_elements.size() - 1;
188 final DefaultConfiguration finishedConfiguration =
189 (DefaultConfiguration)m_elements.remove( depth );
190 final String accumulatedValue =
191 ( (StringBuffer )m_values.remove( depth ) ).toString();
192 final ArrayList prefixes = (ArrayList )m_prefixes.remove( depth );
193
194 final Iterator i = prefixes.iterator();
195 while( i.hasNext() )
196 {
197 endPrefixMapping( (String )i.next() );
198 }
199 prefixes.clear();
200
201 if( finishedConfiguration.getChildren().length == 0 )
202 {
203 String finishedValue;
205 if( m_preserveSpace.get( depth ) )
206 {
207 finishedValue = accumulatedValue;
208 }
209 else if( 0 == accumulatedValue.length() )
210 {
211 finishedValue = null;
212 }
213 else
214 {
215 finishedValue = accumulatedValue.trim();
216 }
217 finishedConfiguration.setValue( finishedValue );
218 }
219 else
220 {
221 final String trimmedValue = accumulatedValue.trim();
222 if( trimmedValue.length() > 0 )
223 {
224 throw new SAXException ( "Not allowed to define mixed content in the "
225 + "element " + finishedConfiguration.getName() + " at "
226 + finishedConfiguration.getLocation() );
227 }
228 }
229
230 if( 0 == depth )
231 {
232 m_configuration = finishedConfiguration;
233 }
234
235 m_namespaceSupport.popContext();
236 }
237
238
247 protected DefaultConfiguration createConfiguration( final String localName,
248 final String namespaceURI,
249 final String location )
250 {
251 String prefix = m_namespaceSupport.getPrefix( namespaceURI );
252 if( prefix == null )
253 {
254 prefix = "";
255 }
256 return new DefaultConfiguration( localName, location, namespaceURI, prefix );
257 }
258
259
268 public void startElement( final String namespaceURI,
269 final String localName,
270 final String rawName,
271 final Attributes attributes )
272 throws SAXException
273 {
274 m_namespaceSupport.pushContext();
275 final DefaultConfiguration configuration =
276 createConfiguration( localName, namespaceURI, getLocationString() );
277 final int depth = m_elements.size();
280 boolean preserveSpace = false;
282 if( depth > 0 )
283 {
284 final DefaultConfiguration parent =
285 (DefaultConfiguration)m_elements.get( depth - 1 );
286 parent.addChild( configuration );
287 preserveSpace = m_preserveSpace.get( depth - 1 );
289 }
290
291 m_elements.add( configuration );
292 m_values.add( new StringBuffer () );
293
294 final ArrayList prefixes = new ArrayList ();
295 AttributesImpl componentAttr = new AttributesImpl ();
296
297 for( int i = 0; i < attributes.getLength(); i++ )
298 {
299 if( attributes.getQName( i ).startsWith( "xmlns" ) )
300 {
301 prefixes.add( attributes.getLocalName( i ) );
302 this.startPrefixMapping( attributes.getLocalName( i ),
303 attributes.getValue( i ) );
304 }
305 else if( attributes.getQName( i ).equals( "xml:space" ) )
306 {
307 preserveSpace = attributes.getValue( i ).equals( "preserve" );
308 }
309 else
310 {
311 componentAttr.addAttribute( attributes.getURI( i ),
312 attributes.getLocalName( i ),
313 attributes.getQName( i ),
314 attributes.getType( i ),
315 attributes.getValue( i ) );
316 }
317 }
318
319 if( preserveSpace )
320 {
321 m_preserveSpace.set( depth );
322 }
323 else
324 {
325 m_preserveSpace.clear( depth );
326 }
327
328 m_prefixes.add( prefixes );
329
330 final int attributesSize = componentAttr.getLength();
331
332 for( int i = 0; i < attributesSize; i++ )
333 {
334 final String name = componentAttr.getQName( i );
335 final String value = componentAttr.getValue( i );
336 configuration.setAttribute( name, value );
337 }
338 }
339
340
345 public void error( final SAXParseException exception )
346 throws SAXException
347 {
348 throw exception;
349 }
350
351
356 public void warning( final SAXParseException exception )
357 throws SAXException
358 {
359 throw exception;
360 }
361
362
367 public void fatalError( final SAXParseException exception )
368 throws SAXException
369 {
370 throw exception;
371 }
372
373
378 protected String getLocationString()
379 {
380 if( null == m_locator )
381 {
382 return "Unknown";
383 }
384 else
385 {
386 return
387 m_locator.getSystemId() + ":"
388 + m_locator.getLineNumber() + ":"
389 + m_locator.getColumnNumber();
390 }
391 }
392
393
400 public void startPrefixMapping( String prefix, String uri )
401 throws SAXException
402 {
403 m_namespaceSupport.declarePrefix( prefix, uri );
404 super.startPrefixMapping( prefix, uri );
405 }
406 }
407 |
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