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16 package org.apache.cocoon.woody.datatype;
17
18 import org.xml.sax.ContentHandler  ;
19 import org.xml.sax.SAXException ;
20 import org.xml.sax.Attributes ;
21 import org.apache.avalon.framework.service.ServiceManager;
22 import org.apache.excalibur.source.SourceResolver;
23 import org.apache.excalibur.source.Source;
24 import org.apache.cocoon.ProcessingException;
25 import org.apache.cocoon.components.source.SourceUtil;
26 import org.apache.cocoon.xml.AttributesImpl;
27 import org.apache.cocoon.xml.AbstractXMLPipe;
28 import org.apache.cocoon.xml.dom.DOMBuilder;
29 import org.apache.cocoon.woody.Constants;
30 import org.apache.cocoon.woody.datatype.convertor.Convertor;
31 import org.apache.cocoon.woody.datatype.convertor.DefaultFormatCache;
32 import org.w3c.dom.Element ;
33
34 import java.io.IOException ;
35 import java.util.Locale ;
36
37
46 public class DynamicSelectionList implements SelectionList {
47 private String src;
48 private Datatype datatype;
49 private ServiceManager serviceManager;
50
51 public DynamicSelectionList(Datatype datatype, String src, ServiceManager serviceManager) {
52 this.datatype = datatype;
53 this.src = src;
54 this.serviceManager = serviceManager;
55 }
56
57 public Datatype getDatatype() {
58 return datatype;
59 }
60
61
65 void generateSaxFragment(ContentHandler contentHandler, Locale locale, Source source) throws ProcessingException, SAXException , IOException {
66 SelectionListHandler handler = new SelectionListHandler(locale);
67 handler.setContentHandler(contentHandler);
68 SourceUtil.toSAX(serviceManager, source, null, handler);
69 }
70
71 public void generateSaxFragment(ContentHandler contentHandler, Locale locale) throws SAXException {
72 SourceResolver sourceResolver = null;
73 Source source = null;
74 try {
75 sourceResolver = (SourceResolver)serviceManager.lookup(SourceResolver.ROLE);
76 source = sourceResolver.resolveURI(src);
77 generateSaxFragment(contentHandler, locale, source);
78 } catch (Exception e) {
79 throw new SAXException ("Error while generating selection list: " + e.getMessage(), e);
80 } finally {
81 if (sourceResolver != null) {
82 if (source != null)
83 try { sourceResolver.release(source); } catch (Exception e) {}
84 serviceManager.release(sourceResolver);
85 }
86 }
87 }
88
89
92 public class SelectionListHandler extends AbstractXMLPipe {
93 private Object currentValue;
94 private String currentValueAsString;
95 private boolean hasLabel;
96 private Locale locale;
97
98 private Convertor convertor;
99 private DOMBuilder convertorConfigDOMBuilder;
100 private int convertorConfigNestingLevel = 0;
101 private Convertor.FormatCache fromFormatCache = new DefaultFormatCache();
102 private Convertor.FormatCache toFormatCache = new DefaultFormatCache();
103
104 public SelectionListHandler(Locale locale) {
105 this.locale = locale;
106 }
107
108 public void startDocument()
109 throws SAXException {
110 }
111
112 public void endDocument()
113 throws SAXException {
114 }
115
116 public void endDTD()
117 throws SAXException {
118 }
119
120 public void startDTD(String name, String publicId, String systemId)
121 throws SAXException {
122 }
123
124 public void startElement(String namespaceURI, String localName, String qName, Attributes attributes)
125 throws SAXException {
126 if (convertorConfigNestingLevel > 0) {
127 convertorConfigNestingLevel++;
128 convertorConfigDOMBuilder.startElement(namespaceURI, localName, qName, attributes);
129 } else if (namespaceURI.equals(Constants.WD_NS)) {
130 if (localName.equals("item")) {
131 if (convertor == null) {
132 convertor = datatype.getConvertor();
134 }
135 hasLabel = false;
136
137 String unparsedValue = attributes.getValue("value");
138 if (unparsedValue == null || "".equals(unparsedValue)) {
139 currentValueAsString = "";
141 } else {
142 currentValue = convertor.convertFromString(unparsedValue, locale, fromFormatCache);
143 if (currentValue == null) {
144 throw new SAXException ("Could not interpret the following value: \"" + unparsedValue + "\".");
145 }
146 currentValueAsString = datatype.getConvertor().convertToString(currentValue, locale, toFormatCache);
147 }
148 AttributesImpl attrs = new AttributesImpl();
149 attrs.addCDATAAttribute("value", currentValueAsString);
150 super.startElement(Constants.WI_NS, localName, Constants.WI_PREFIX_COLON + localName, attrs);
151 } else if (localName.equals("label")) {
152 hasLabel = true;
153 super.startElement(Constants.WI_NS, localName, Constants.WI_PREFIX_COLON + localName, attributes);
154 } else if (localName.equals("selection-list")) {
155 super.startElement(Constants.WI_NS, localName, Constants.WI_PREFIX_COLON + localName, attributes);
156 } else if (convertor == null && localName.equals("convertor")) {
157 convertorConfigDOMBuilder = new DOMBuilder();
159 convertorConfigDOMBuilder.startElement(namespaceURI, localName, qName, attributes);
160 convertorConfigNestingLevel++;
161 } else {
162 super.startElement(namespaceURI, localName, qName, attributes);
163 }
164 } else {
165 super.startElement(namespaceURI, localName, qName, attributes);
166 }
167 }
168
169 private static final String LABEL_EL = "label";
170
171 public void endElement(String namespaceURI, String localName, String qName)
172 throws SAXException {
173 if (convertorConfigNestingLevel > 0) {
174 convertorConfigNestingLevel--;
175 convertorConfigDOMBuilder.endElement(namespaceURI, localName, qName);
176 if (convertorConfigNestingLevel == 0) {
177 Element convertorElement = convertorConfigDOMBuilder.getDocument().getDocumentElement();
178 try {
179 convertor = datatype.getBuilder().buildConvertor(convertorElement);
180 } catch (Exception e) {
181 throw new SAXException ("Error building convertor from convertor configuration embedded in selection list XML.", e);
182 }
183 }
184 } else if (namespaceURI.equals(Constants.WD_NS)) {
185 if (localName.equals("item")) {
186 if (!hasLabel) {
187 super.startElement(Constants.WI_NS, LABEL_EL, Constants.WI_PREFIX_COLON + LABEL_EL, new AttributesImpl());
189 super.characters(currentValueAsString.toCharArray(), 0, currentValueAsString.length());
190 super.endElement(Constants.WI_NS, LABEL_EL, Constants.WI_PREFIX_COLON + LABEL_EL);
191 }
192 super.endElement(Constants.WI_NS, localName, Constants.WI_PREFIX_COLON + localName);
193 } else if (localName.equals("label")) {
194 super.endElement(Constants.WI_NS, localName, Constants.WI_PREFIX_COLON + localName);
195 } else if (localName.equals("selection-list")) {
196 super.endElement(Constants.WI_NS, localName, Constants.WI_PREFIX_COLON + localName);
197 } else {
198 super.endElement(namespaceURI, localName, qName);
199 }
200 } else {
201 super.endElement(namespaceURI, localName, qName);
202 }
203 }
204
205 public void comment(char ch[], int start, int len)
206 throws SAXException {
207 if (convertorConfigNestingLevel > 0) {
208 convertorConfigDOMBuilder.comment(ch, start, len);
209 } else
210 super.comment(ch, start, len);
211 }
212
213 public void startPrefixMapping(String prefix, String uri)
214 throws SAXException {
215 if (convertorConfigNestingLevel > 0) {
216 convertorConfigDOMBuilder.startPrefixMapping(prefix, uri);
217 } else
218 super.startPrefixMapping(prefix, uri);
219 }
220
221 public void endPrefixMapping(String prefix)
222 throws SAXException {
223 if (convertorConfigNestingLevel > 0) {
224 convertorConfigDOMBuilder.endPrefixMapping(prefix);
225 } else
226 super.endPrefixMapping(prefix);
227 }
228
229 public void characters(char c[], int start, int len)
230 throws SAXException {
231 if (convertorConfigNestingLevel > 0) {
232 convertorConfigDOMBuilder.characters(c, start, len);
233 } else
234 super.characters(c, start, len);
235 }
236
237 public void ignorableWhitespace(char c[], int start, int len)
238 throws SAXException {
239 if (convertorConfigNestingLevel > 0) {
240 convertorConfigDOMBuilder.ignorableWhitespace(c, start, len);
241 } else
242 super.ignorableWhitespace(c, start, len);
243 }
244
245 public void processingInstruction(String target, String data)
246 throws SAXException {
247 if (convertorConfigNestingLevel > 0) {
248 convertorConfigDOMBuilder.processingInstruction(target, data);
249 } else
250 super.processingInstruction(target, data);
251 }
252
253 public void skippedEntity(String name)
254 throws SAXException {
255 if (convertorConfigNestingLevel > 0) {
256 convertorConfigDOMBuilder.skippedEntity(name);
257 } else
258 super.skippedEntity(name);
259 }
260
261 public void startEntity(String name)
262 throws SAXException {
263 if (convertorConfigNestingLevel > 0) {
264 convertorConfigDOMBuilder.startEntity(name);
265 } else
266 super.startEntity(name);
267 }
268
269 public void endEntity(String name)
270 throws SAXException {
271 if (convertorConfigNestingLevel > 0) {
272 convertorConfigDOMBuilder.endEntity(name);
273 } else
274 super.endEntity(name);
275 }
276
277 public void startCDATA()
278 throws SAXException {
279 if (convertorConfigNestingLevel > 0) {
280 convertorConfigDOMBuilder.startCDATA();
281 } else
282 super.startCDATA();
283 }
284
285 public void endCDATA()
286 throws SAXException {
287 if (convertorConfigNestingLevel > 0) {
288 convertorConfigDOMBuilder.endCDATA();
289 } else
290 super.endCDATA();
291 }
292 }
293 }
294 |
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