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16 package org.apache.cocoon.forms;
17
18 import org.apache.avalon.framework.CascadingException;
19 import org.apache.avalon.framework.activity.Disposable;
20 import org.apache.avalon.framework.activity.Initializable;
21 import org.apache.avalon.framework.component.Component;
22 import org.apache.avalon.framework.configuration.Configurable;
23 import org.apache.avalon.framework.configuration.Configuration;
24 import org.apache.avalon.framework.configuration.ConfigurationException;
25 import org.apache.avalon.framework.context.Context;
26 import org.apache.avalon.framework.context.ContextException;
27 import org.apache.avalon.framework.context.Contextualizable;
28 import org.apache.avalon.framework.logger.AbstractLogEnabled;
29 import org.apache.avalon.framework.service.ServiceException;
30 import org.apache.avalon.framework.service.ServiceManager;
31 import org.apache.avalon.framework.service.ServiceSelector;
32 import org.apache.avalon.framework.service.Serviceable;
33 import org.apache.avalon.framework.thread.ThreadSafe;
34 import org.apache.cocoon.forms.formmodel.Form;
35 import org.apache.cocoon.forms.formmodel.FormDefinition;
36 import org.apache.cocoon.forms.formmodel.FormDefinitionBuilder;
37 import org.apache.cocoon.forms.formmodel.WidgetDefinitionBuilder;
38 import org.apache.cocoon.forms.formmodel.library.LibraryManager;
39 import org.apache.cocoon.forms.formmodel.library.LibraryManagerImpl;
40 import org.apache.cocoon.forms.util.DomHelper;
41 import org.apache.cocoon.forms.util.SimpleServiceSelector;
42 import org.apache.excalibur.source.Source;
43 import org.apache.excalibur.source.SourceResolver;
44 import org.w3c.dom.Document  ;
45 import org.w3c.dom.Element ;
46 import org.xml.sax.InputSource ;
47
48
53 public class DefaultFormManager
54 extends AbstractLogEnabled
55 implements FormManager, Contextualizable, ThreadSafe, Serviceable, Disposable, Configurable, Component, Initializable {
56
58 protected static final String PREFIX = "CocoonForm:";
59 protected ServiceManager manager;
60 protected Configuration configuration;
61 protected SimpleServiceSelector widgetDefinitionBuilderSelector;
62 protected CacheManager cacheManager;
63
64 protected LibraryManagerImpl libraryManager;
65
66 private Context avalonContext;
67 public void contextualize(Context context) throws ContextException {
68 this.avalonContext = context;
69 }
70
71
72 public Context getAvalonContext() {
74 return this.avalonContext;
75 }
76
77 public void service(ServiceManager manager) throws ServiceException {
78 this.manager = manager;
79 this.cacheManager = (CacheManager)manager.lookup(CacheManager.ROLE);
80 }
81
82
85 public void configure(Configuration configuration) throws ConfigurationException {
86 this.configuration = configuration;
87 }
88
89 public void initialize() throws Exception {
90
91 libraryManager = new LibraryManagerImpl();
92 libraryManager.enableLogging(getLogger().getChildLogger("library"));
93 libraryManager.service(new FormServiceManager());
94 libraryManager.configure(configuration.getChild("libraries"));
95
96 widgetDefinitionBuilderSelector = new SimpleServiceSelector("widget", WidgetDefinitionBuilder.class);
97 widgetDefinitionBuilderSelector.contextualize(avalonContext);
98 widgetDefinitionBuilderSelector.service(new FormServiceManager());
99 widgetDefinitionBuilderSelector.configure(configuration.getChild("widgets"));
100
101 libraryManager.initialize();
102 }
103
104 public ServiceSelector getWidgetDefinitionBuilderSelector() {
105 return this.widgetDefinitionBuilderSelector;
106 }
107
108 public Form createForm(Source source) throws Exception {
109 FormDefinition formDefinition = getFormDefinition(source);
110 Form form = (Form)formDefinition.createInstance();
111 form.initialize();
112 return form;
113 }
114
115 public Form createForm(String uri) throws Exception {
116 SourceResolver sourceResolver = null;
117 Source source = null;
118
119 try {
120 sourceResolver = (SourceResolver)manager.lookup(SourceResolver.ROLE);
121
122 source = sourceResolver.resolveURI(uri);
123 Form form = createForm(source);
124 return form;
125 } finally {
126 if (source != null) {
127 sourceResolver.release(source);
128 }
129 if (sourceResolver != null) {
130 manager.release(sourceResolver);
131 }
132 }
133 }
134
135 public Form createForm(Element formElement) throws Exception {
136 Form form = (Form)getFormDefinition(formElement).createInstance();
137 form.initialize();
138 return form;
139 }
140
141 public FormDefinition createFormDefinition(Element formElement) throws Exception {
142 return getFormDefinition(formElement);
143 }
144
145 public FormDefinition getFormDefinition(Source source) throws Exception {
146 FormDefinition formDefinition = (FormDefinition)this.cacheManager.get(source, PREFIX);
147
148 if(formDefinition != null && formDefinition.getLocalLibrary().dependenciesHaveChanged())
149 formDefinition = null;
151 if (formDefinition == null) {
152
153 if(getLogger().isDebugEnabled())
154 getLogger().debug("Building Form: "+source.getURI());
155
156 Document formDocument;
157 try {
158 InputSource inputSource = new InputSource (source.getInputStream());
159 inputSource.setSystemId(source.getURI());
160 formDocument = DomHelper.parse(inputSource, this.manager);
161 } catch (Exception e) {
162 throw new CascadingException("Could not parse form definition from " +
163 source.getURI(), e);
164 }
165
166 Element formElement = formDocument.getDocumentElement();
167 formDefinition = getFormDefinition(formElement);
168 this.cacheManager.set(formDefinition, source, PREFIX);
169 }
170 return formDefinition;
171 }
172
173 public FormDefinition getFormDefinition(Element formElement) throws Exception {
174 if (!(formElement.getLocalName().equals("form") || FormsConstants.DEFINITION_NS.equals(formElement.getNamespaceURI())))
176 throw new Exception ("Expected a Cocoon Forms form element at " + DomHelper.getLocation(formElement));
177
178 FormDefinitionBuilder formDefinitionBuilder = (FormDefinitionBuilder)widgetDefinitionBuilderSelector.select("form");
179 return (FormDefinition)formDefinitionBuilder.buildWidgetDefinition(formElement);
180 }
181
182 public FormDefinition createFormDefinition(String uri) throws Exception {
183 SourceResolver sourceResolver = null;
184 Source source = null;
185 Document formDocument = null;
186
187 try {
188 sourceResolver = (SourceResolver)manager.lookup(SourceResolver.ROLE);
189 source = sourceResolver.resolveURI(uri);
190
191 try {
192 InputSource inputSource = new InputSource (source.getInputStream());
193 inputSource.setSystemId(source.getURI());
194 formDocument = DomHelper.parse(inputSource, this.manager);
195 } catch (Exception e) {
196 throw new CascadingException("Could not parse form definition from " +
197 source.getURI(), e);
198 }
199
200 } finally {
201 if (source != null)
202 sourceResolver.release(source);
203 if (sourceResolver != null)
204 manager.release(sourceResolver);
205 }
206
207 Element formElement = formDocument.getDocumentElement();
208 return getFormDefinition(formElement);
209 }
210
211
214 public void dispose() {
215 if (this.widgetDefinitionBuilderSelector != null) {
216 this.widgetDefinitionBuilderSelector.dispose();
217 this.widgetDefinitionBuilderSelector = null;
218 }
219 if(this.libraryManager != null) {
220 this.libraryManager.dispose();
221 this.libraryManager = null;
222 }
223 this.manager.release(this.cacheManager);
224 this.cacheManager = null;
225 this.manager = null;
226 }
227
228
229 public class FormServiceManager implements ServiceManager {
230 final String WIDGET_DEFINITION_BUILDER_SELECTOR_ROLE = WidgetDefinitionBuilder.class.getName() + "Selector";
231 final String LIBRARY_MANAGER_ROLE = LibraryManager.ROLE;
232
233 public Object lookup(String name) throws ServiceException {
234 if (WIDGET_DEFINITION_BUILDER_SELECTOR_ROLE.equals(name))
235 return widgetDefinitionBuilderSelector;
236 else if(LIBRARY_MANAGER_ROLE.equals(name))
237 return libraryManager;
238 else
239 return manager.lookup(name);
240 }
241
242 public boolean hasService(String name) {
243 if (WIDGET_DEFINITION_BUILDER_SELECTOR_ROLE.equals(name))
244 return true;
245 else if(LIBRARY_MANAGER_ROLE.equals(name))
246 return true;
247 else
248 return manager.hasService(name);
249 }
250
251 public void release(Object service) {
252 if (service != widgetDefinitionBuilderSelector
253 && service != libraryManager)
254 manager.release(service);
255 }
256 }
257 }
258 |
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