DefaultModelReader


1   /* ========================================================================
2    * JCommon : a free general purpose class library for the Java(tm) platform
3    * ========================================================================
4    *
5    * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6    * 
7    * Project Info:  http://www.jfree.org/jcommon/index.html
8    *
9    * This library is free software; you can redistribute it and/or modify it 
10   * under the terms of the GNU Lesser General Public License as published by 
11   * the Free Software Foundation; either version 2.1 of the License, or 
12   * (at your option) any later version.
13   *
14   * This library is distributed in the hope that it will be useful, but 
15   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
16   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
17   * License for more details.
18   *
19   * You should have received a copy of the GNU Lesser General Public
20   * License along with this library; if not, write to the Free Software
21   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
22   * USA.  
23   *
24   * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
25   * in the United States and other countries.]
26   * 
27   * -----------------------
28   * DefaultModelReader.java
29   * -----------------------
30   * (C)opyright 2003, 2004, by Thomas Morgner and Contributors.
31   *
32   * Original Author:  Thomas Morgner;
33   * Contributor(s):   David Gilbert (for Object Refinery Limited);
34   *
35   * $Id: DefaultModelReader.java,v 1.2 2005/10/18 13:32:20 mungady Exp $
36   *
37   * Changes
38   * -------
39   * 12-Nov-2003 : Initial version (TM);
40   * 26-Nov-2003 : Updated header and Javadocs (DG);
41   *
42   */
43  
44  package org.jfree.xml.generator;
45  
46  import java.beans.BeanInfo  ;
47  import java.beans.IntrospectionException  ;
48  import java.beans.Introspector  ;
49  import java.beans.PropertyDescriptor  ;
50  import java.io.File  ;
51  import java.io.IOException  ;
52  import java.net.URL  ;
53  import java.util.ArrayList  ;
54  
55  import org.jfree.io.IOUtils;
56  import org.jfree.xml.generator.model.ClassDescription;
57  import org.jfree.xml.generator.model.Comments;
58  import org.jfree.xml.generator.model.DescriptionModel;
59  import org.jfree.xml.generator.model.IgnoredPropertyInfo;
60  import org.jfree.xml.generator.model.ManualMappingInfo;
61  import org.jfree.xml.generator.model.MultiplexMappingInfo;
62  import org.jfree.xml.generator.model.PropertyInfo;
63  import org.jfree.xml.generator.model.PropertyType;
64  import org.jfree.xml.generator.model.TypeInfo;
65  import org.jfree.xml.util.AbstractModelReader;
66  import org.jfree.xml.util.ObjectDescriptionException;
67  
68  /**
69   * A reader for the class model.
70   */
71  public class DefaultModelReader extends AbstractModelReader {
72  
73      /** A model containing classes and the corresponding class descriptions. */
74      private DescriptionModel model;
75  
76      /** The class description under construction. */
77      private ClassDescription currentClassDescription;
78  
79      /** Information about the class being processed. */
80      private BeanInfo   currentBeanInfo;
81  
82      /** The base URL. */
83      private URL   baseURL;
84      
85      /** The source. */
86      private String   source;
87      
88      /** The multiplex mapping info. */
89      private MultiplexMappingInfo multiplexInfo;
90      
91      /** The multiplex type info.*/
92      private ArrayList   multiplexTypeInfos;
93  
94      /** Storage for the properties of the current class. */
95      private ArrayList   propertyList;
96  
97      /** Storage for the constructors of the current class. */
98      private ArrayList   constructorList;
99  
100     /**
101      * Creates a new model reader.
102      */
103     public DefaultModelReader() {
104         super();
105     }
106 
107     /**
108      * Loads a description model.
109      * 
110      * @param file  the file name.
111      * 
112      * @return A description model.
113      * 
114      * @throws IOException  if there is an I/O problem.
115      * @throws ObjectDescriptionException  if there is a problem reading the object descriptions.
116      */
117     public synchronized DescriptionModel load(final String   file) throws IOException  ,
118                                                                   ObjectDescriptionException {
119         
120         this.model = new DescriptionModel();
121         this.baseURL = new File   (file).toURL();
122         parseXml(this.baseURL);
123         fillSuperClasses();
124         return this.model;
125         
126     }
127 
128     /**
129      * Iterates through all the class descriptions in the model, setting the superclass
130      * attribute in all cases where the superclass definitions are contained in the model.
131      */
132     protected void fillSuperClasses() {
133         for (int i = 0; i < this.model.size(); i++) {
134             final ClassDescription cd = this.model.get(i);
135             final Class   parent = cd.getObjectClass().getSuperclass();
136             if (parent == null) {
137                 continue;
138             }
139             final ClassDescription superCD = this.model.get(parent);
140             if (superCD != null) {
141                 cd.setSuperClass(superCD.getObjectClass());
142             }
143         }
144     }
145 
146     /**
147      * Begin processing an object definition element.
148      *
149      * @param className  the class name.
150      * @param register  the register name (<code>null</code> permitted).
151      * @param ignore  ??
152      *
153      * @return <code>true</code> if the class is available, and <code>false</code> otherwise.
154      */
155     protected boolean startObjectDefinition(final String   className, final String   register, final boolean ignore) {
156         final Class   c = loadClass(className);
157         if (c == null) {
158             return false;
159         }
160         this.currentClassDescription = new ClassDescription(c);
161         this.currentClassDescription.setPreserve(ignore);
162         this.currentClassDescription.setRegisterKey(register);
163         try {
164             this.currentBeanInfo = Introspector.getBeanInfo(c, Object  .class);
165         }
166         catch (IntrospectionException   ie) {
167             return false;
168         }
169         this.propertyList = new java.util.ArrayList  ();
170         this.constructorList = new java.util.ArrayList  ();
171         return true;
172     }
173 
174     /**
175      * Finishes processing an object definition (sets the constructor and property info for the
176      * class description, and adds the class description to the model).
177      * 
178      * @throws ObjectDescriptionException if there is a problem with the object description.
179      */
180     protected void endObjectDefinition() throws ObjectDescriptionException {
181         final PropertyInfo[] pis = (PropertyInfo[])
182             this.propertyList.toArray(new PropertyInfo[this.propertyList.size()]);
183         this.currentClassDescription.setProperties(pis);
184 
185         final TypeInfo[] tis = (TypeInfo[])
186         this.constructorList.toArray(new TypeInfo[this.constructorList.size()]);
187 
188         this.currentClassDescription.setConstructorDescription(tis);
189         this.currentClassDescription.setComments
190             (new Comments(getOpenComment(), getCloseComment()));
191         this.currentClassDescription.setSource(this.source);
192 
193         this.model.addClassDescription(this.currentClassDescription);
194 
195         this.propertyList = null;
196         this.currentBeanInfo = null;
197         this.currentClassDescription = null;
198     }
199 
200     /**
201      * Handles the description of an attribute within an object definition.
202      *
203      * @param name  the name.
204      * @param attribName  the attribute name.
205      * @param handlerClass  the fully qualified class name for the attribute handler.
206      * 
207      * @throws ObjectDescriptionException if there is a problem with the object description.
208      */
209     protected void handleAttributeDefinition(final String   name, final String   attribName, final String   handlerClass)
210         throws ObjectDescriptionException {
211 
212         final PropertyInfo propertyInfo = ModelBuilder.getInstance().createSimplePropertyInfo
213             (getPropertyDescriptor(name));
214 
215         if (propertyInfo == null) {
216             throw new ObjectDescriptionException("Unable to load property " + name);
217         }
218 
219         propertyInfo.setComments(new Comments(getOpenComment(), getCloseComment()));
220         propertyInfo.setPropertyType(PropertyType.ATTRIBUTE);
221         propertyInfo.setXmlName(attribName);
222         propertyInfo.setXmlHandler(handlerClass);
223         this.propertyList.add(propertyInfo);
224     }
225 
226     /**
227      * Handles the constructor definition.
228      * 
229      * @param tagName  the tag name.
230      * @param parameterClass  the parameter class.
231      * 
232      * @throws ObjectDescriptionException if there is a problem with the object description.
233      */
234     protected void handleConstructorDefinition(final String   tagName, final String   parameterClass)
235         throws ObjectDescriptionException {
236 
237         final Class   c = loadClass(parameterClass);
238         if (c == null) {
239             throw new ObjectDescriptionException("Failed to load class " + parameterClass);
240         }
241         final TypeInfo ti = new TypeInfo(tagName, c);
242         ti.setComments(new Comments(getOpenComment(), getCloseComment()));
243         this.constructorList.add (ti);
244     }
245 
246     /**
247      * Handles the description of an element within an object definition.
248      *
249      * @param name  the property name.
250      * @param element  the element name.
251      * 
252      * @throws ObjectDescriptionException if there is a problem with the object description.
253      */
254     protected void handleElementDefinition(final String   name, final String   element)
255         throws ObjectDescriptionException {
256 
257         final PropertyInfo propertyInfo = ModelBuilder.getInstance().createSimplePropertyInfo
258             (getPropertyDescriptor(name));
259 
260         if (propertyInfo == null) {
261             throw new ObjectDescriptionException("Unable to load property " + name);
262         }
263 
264         propertyInfo.setComments(new Comments(getOpenComment(), getCloseComment()));
265         propertyInfo.setPropertyType(PropertyType.ELEMENT);
266         propertyInfo.setXmlName(element);
267         propertyInfo.setXmlHandler(null);
268         this.propertyList.add(propertyInfo);
269 
270     }
271 
272     /**
273      * Handles a lookup definition.
274      * 
275      * @param name  the name.
276      * @param lookupKey  the lookup key.
277      * 
278      * @throws ObjectDescriptionException if there is a problem with the object description.
279      */
280     protected void handleLookupDefinition(final String   name, final String   lookupKey)
281         throws ObjectDescriptionException {
282         final PropertyInfo propertyInfo = ModelBuilder.getInstance().createSimplePropertyInfo
283             (getPropertyDescriptor(name));
284 
285         if (propertyInfo == null) {
286             throw new ObjectDescriptionException("Unable to load property " + name);
287         }
288 
289         propertyInfo.setComments(new Comments(getOpenComment(), getCloseComment()));
290         propertyInfo.setPropertyType(PropertyType.LOOKUP);
291         propertyInfo.setXmlName(lookupKey);
292         propertyInfo.setXmlHandler(null);
293         this.propertyList.add(propertyInfo);
294     }
295 
296     /**
297      * Returns a property descriptor for the named property, or <code>null</code> if there is
298      * no descriptor with the given name.
299      *
300      * @param propertyName  the property name.
301      *
302      * @return a property descriptor.
303      */
304     protected PropertyDescriptor   getPropertyDescriptor(final String   propertyName) {
305         final PropertyDescriptor  [] pds = this.currentBeanInfo.getPropertyDescriptors();
306         for (int i = 0; i < pds.length; i++) {
307             if (pds[i].getName().equals(propertyName)) {
308                 return pds[i];
309             }
310         }
311         return null;
312     }
313 
314     /**
315      * Handles an ignored property.
316      * 
317      * @param name  the name.
318      */
319     protected void handleIgnoredProperty(final String   name) {
320         final IgnoredPropertyInfo propertyInfo = new IgnoredPropertyInfo(name);
321         propertyInfo.setComments(new Comments(getOpenComment(), getCloseComment()));
322         this.propertyList.add(propertyInfo);
323     }
324 
325     /**
326      * Handles a manual mapping.
327      *
328      * @param className  the class name.
329      * @param readHandler  the read handler.
330      * @param writeHandler  the write handler.
331      * 
332      * @return A boolean.
333      * 
334      * @throws ObjectDescriptionException if there is a problem with the object description.
335      */
336     protected boolean handleManualMapping(final String   className, final String   readHandler, final String   writeHandler)
337         throws ObjectDescriptionException {
338 
339         final ManualMappingInfo manualMappingInfo =
340             new ManualMappingInfo(loadClass(className),
341                 loadClass(readHandler), loadClass(writeHandler));
342         manualMappingInfo.setComments(new Comments(getOpenComment(), getCloseComment()));
343         manualMappingInfo.setSource(this.source);
344         this.model.getMappingModel().addManualMapping(manualMappingInfo);
345         return true;
346     }
347 
348     /**
349      * Start a multiplex mapping.
350      * 
351      * @param className  the class name.
352      * @param typeAttr  the type.
353      */
354     protected void startMultiplexMapping(final String   className, final String   typeAttr) {
355         this.multiplexInfo = new MultiplexMappingInfo(loadClass(className), typeAttr);
356         this.multiplexInfo.setSource(this.source);
357         this.multiplexTypeInfos = new ArrayList  ();
358     }
359 
360     /**
361      * Handles a multiplex mapping.
362      * 
363      * @param typeName  the type name.
364      * @param className  the class name.
365      * 
366      * @throws ObjectDescriptionException if there is a problem with the object description.
367      */
368     protected void handleMultiplexMapping(final String   typeName, final String   className)
369         throws ObjectDescriptionException {
370         final TypeInfo info = new TypeInfo(typeName, loadClass(className));
371         info.setComments(new Comments(getOpenComment(), getCloseComment()));
372         this.multiplexTypeInfos.add (info);
373     }
374 
375     /**
376      * Ends a multiplex mapping.
377      * 
378      * @throws ObjectDescriptionException if there is a problem with the object description. 
379      */
380     protected void endMultiplexMapping() throws ObjectDescriptionException {
381         final TypeInfo[] typeInfos = (TypeInfo[]) this.multiplexTypeInfos.toArray(
382             new TypeInfo[this.multiplexTypeInfos.size()]
383         );
384         this.multiplexInfo.setComments(new Comments(getOpenComment(), getCloseComment()));
385         this.multiplexInfo.setChildClasses(typeInfos);
386         this.model.getMappingModel().addMultiplexMapping(this.multiplexInfo);
387         this.multiplexInfo = null;
388     }
389 
390     /**
391      * Starts include handling.
392      * 
393      * @param resource  the URL.
394      */
395     protected void startIncludeHandling(final URL   resource) {
396         this.source = IOUtils.getInstance().createRelativeURL(resource, this.baseURL);
397         this.model.addSource(this.source);
398         this.model.addIncludeComment(
399             this.source, new Comments(getOpenComment(), getCloseComment())
400         );
401     }
402 
403     /**
404      * Ends include handling.
405      */
406     protected void endIncludeHandling() {
407         this.source = "";
408     }
409 
410     /**
411      * Starts the root document.
412      */
413     protected void startRootDocument() {
414         this.source = "";
415     }
416 
417     /**
418      * Ends the root document.
419      */
420     protected void endRootDocument() {
421         this.model.setModelComments(new Comments(getOpenComment(), getCloseComment()));
422     }
423 }
424
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