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16 package org.apache.cocoon.faces.taglib;
17
18 import org.apache.avalon.framework.parameters.Parameters;
19
20 import org.apache.cocoon.environment.ObjectModelHelper;
21 import org.apache.cocoon.environment.Request;
22 import org.apache.cocoon.environment.SourceResolver;
23 import org.apache.cocoon.taglib.Tag;
24 import org.apache.cocoon.taglib.XMLProducerTagSupport;
25
26 import org.apache.cocoon.faces.FacesUtils;
27 import org.apache.cocoon.faces.renderkit.XMLResponseWriter;
28 import org.apache.commons.lang.BooleanUtils;
29 import org.xml.sax.Attributes  ;
30 import org.xml.sax.SAXException ;
31
32 import javax.faces.application.Application;
33 import javax.faces.component.UIComponent;
34 import javax.faces.context.FacesContext;
35 import javax.faces.context.ResponseWriter;
36 import javax.faces.el.ValueBinding;
37 import java.io.IOException ;
38 import java.util.ArrayList ;
39 import java.util.Iterator ;
40 import java.util.List ;
41 import java.util.Map ;
42
43
46 public abstract class UIComponentTag extends XMLProducerTagSupport {
47
48 private static final String CREATED_COMPONENTS = "javax.faces.webapp.COMPONENT_IDS";
49 private static final String CREATED_FACETS = "javax.faces.webapp.FACET_NAMES";
50
51
55 private String id;
56 private String binding;
57 private String rendered;
58
59
63 private FacesContext context;
64 private UIComponent component;
65
66 private boolean created;
67 private List createdComponents;
68 private List createdFacets;
69
70
74 protected final FacesContext getFacesContext() {
75 return this.context;
76 }
77
78 protected final Application getApplication() {
79 return getFacesContext().getApplication();
80 }
81
82 protected final UIComponent getComponentInstance() {
83 return this.component;
84 }
85
86 protected final boolean getCreated() {
87 return this.created;
88 }
89
90 protected final ValueBinding createValueBinding(String valueRef) {
91 return getApplication().createValueBinding(valueRef);
92 }
93
94 protected final Object evaluate(String value) {
95 if (FacesUtils.isExpression(value)) {
96 return createValueBinding(value).getValue(getFacesContext());
97 }
98
99 return value;
100 }
101
102 protected final boolean evaluateBoolean(String value) {
103 if (FacesUtils.isExpression(value)) {
104 Boolean obj = (Boolean ) createValueBinding(value).getValue(getFacesContext());
105 return obj.booleanValue();
106 }
107
108 return BooleanUtils.toBoolean(value);
109 }
110
111 protected final int evaluateInteger(String value) {
112 if (FacesUtils.isExpression(value)) {
113 Number obj = (Number ) createValueBinding(value).getValue(getFacesContext());
114 return obj.intValue();
115 }
116
117 return Integer.parseInt(value);
118 }
119
120 protected final long evaluateLong(String value) {
121 if (FacesUtils.isExpression(value)) {
122 Number obj = (Number ) createValueBinding(value).getValue(getFacesContext());
123 return obj.longValue();
124 }
125
126 return Long.parseLong(value);
127 }
128
129 protected final double evaluateDouble(String value) {
130 if (FacesUtils.isExpression(value)) {
131 Number obj = (Number ) createValueBinding(value).getValue(getFacesContext());
132 return obj.doubleValue();
133 }
134
135 return Double.parseDouble(value);
136 }
137
138
142 public void setup(SourceResolver resolver, Map objectModel, Parameters parameters)
143 throws SAXException , IOException {
144 super.setup(resolver, objectModel, parameters);
145
146 this.context = FacesUtils.getFacesContext(this, objectModel);
148
149 ResponseWriter writer = this.context.getResponseWriter();
151 if (writer == null) {
152 Request request = ObjectModelHelper.getRequest(objectModel);
154 writer = new XMLResponseWriter(this.xmlConsumer, null, request.getCharacterEncoding());
155 this.context.setResponseWriter(writer);
156 }
157 }
158
159 public int doStartTag(String namespaceURI, String localName, String qName, Attributes attrs)
160 throws SAXException {
161 final UIComponentTag parentTag = findParent();
162
163 this.component = findComponent(parentTag);
164
165 try {
166 if (!isSuppressed()) {
167 if (!this.component.getRendersChildren()) {
168 encodeBegin();
169 getFacesContext().getResponseWriter().flush();
170 }
171 }
172 } catch (IOException e) {
173 throw new SAXException ("Exception in doStartTag", e);
174 }
175
176 return getDoStartValue();
177 }
178
179 public int doEndTag(String namespaceURI, String localName, String qName)
180 throws SAXException {
181 removeOldChildren();
182 removeOldFacets();
183 try {
184 if (!isSuppressed()) {
185 if (this.component.getRendersChildren()) {
186 encodeBegin();
187 encodeChildren();
188 }
189 encodeEnd();
190 getFacesContext().getResponseWriter().flush();
191 }
192 } catch (IOException e) {
193 throw new SAXException ("Exception in doEndTag", e);
194 }
195
196 return getDoEndValue();
197 }
198
199
200
204 public void recycle() {
205 super.recycle();
206
207 this.component = null;
208 this.context = null;
209
210 this.id = null;
211 this.binding = null;
212 this.created = false;
213 this.rendered = null;
214
215 this.createdComponents = null;
216 this.createdFacets = null;
217 }
218
219
220
224 protected abstract String getComponentType();
225
226 protected abstract String getRendererType();
227
228 protected int getDoEndValue() {
229 return Tag.EVAL_PAGE;
230 }
231
232 protected int getDoStartValue() {
233 return Tag.EVAL_BODY;
234 }
235
236 protected void encodeBegin() throws IOException {
237 this.component.encodeBegin(this.context);
238 }
239
240 protected void encodeChildren() throws IOException {
241 this.component.encodeChildren(this.context);
242 }
243
244 protected void encodeEnd() throws IOException {
245 this.component.encodeEnd(this.context);
246 }
247
248 protected void setProperties(UIComponent component) {
249 if (this.rendered != null) {
250 if (FacesUtils.isExpression(this.rendered)) {
251 ValueBinding vb = createValueBinding(this.rendered);
252 component.setValueBinding("rendered", vb);
253 } else {
254 component.setRendered(BooleanUtils.toBoolean(this.rendered));
255 }
256 }
257
258 if (getRendererType() != null) {
259 component.setRendererType(getRendererType());
260 }
261 }
262
263 protected final void setProperty(UIComponent component, String name, String value) {
264 if (value != null) {
265 if (FacesUtils.isExpression(value)) {
266 ValueBinding vb = createValueBinding(value);
267 component.setValueBinding(name, vb);
268 } else {
269 component.getAttributes().put(name, value);
270 }
271 }
272 }
273
274 protected final void setBooleanProperty(UIComponent component, String name, String value) {
275 if (value != null) {
276 if (FacesUtils.isExpression(value)) {
277 ValueBinding vb = createValueBinding(value);
278 component.setValueBinding(name, vb);
279 } else {
280 component.getAttributes().put(name, BooleanUtils.toBooleanObject(value));
281 }
282 }
283 }
284
285 protected final void setIntegerProperty(UIComponent component, String name, String value) {
286 if (value != null) {
287 if (FacesUtils.isExpression(value)) {
288 ValueBinding vb = createValueBinding(value);
289 component.setValueBinding(name, vb);
290 } else {
291 component.getAttributes().put(name, new Integer (value));
292 }
293 }
294 }
295
296
297
301 private UIComponentTag findParent() {
302 Tag parent = this;
303 do {
304 parent = parent.getParent();
305 } while (parent != null && !(parent instanceof UIComponentTag));
306
307 return (UIComponentTag) parent;
308 }
309
310
313 private UIComponent findComponent(UIComponentTag parentTag) {
314 if (parentTag == null) {
316 UIComponent root = getFacesContext().getViewRoot();
317 setProperties(root);
318 if (this.id != null) {
319 root.setId(this.id);
320 }
321 return root;
322 }
323
324 String id = createId();
325
326 String facet = getFacetName();
328 if (facet != null) {
329 return createFacet(parentTag, facet, id);
330 }
331
332 return createChild(parentTag, id);
334 }
335
336
339 private String getFacetName() {
340 final Tag parentTag = getParent();
341 if (parentTag instanceof FacetTag) {
342 return ((FacetTag) parentTag).getName();
343 }
344
345 return null;
346 }
347
348 private boolean isSuppressed() {
349 if (getFacetName() != null) {
350 return true;
351 }
352
353 if (!this.component.isRendered()) {
354 return true;
355 }
356
357 for (UIComponent component = this.component.getParent(); component != null; component = component.getParent()) {
358 if (!component.isRendered()) {
359 return true;
360 }
361
362 if (component.getRendersChildren()) {
363 return true;
364 }
365 }
366
367 return false;
368 }
369
370 private void addChild(UIComponent child) {
371 if (createdComponents == null) {
372 createdComponents = new ArrayList ();
373 }
374 createdComponents.add(child.getId());
375 }
376
377 private void addFacet(String name) {
378 if (createdFacets == null) {
379 createdFacets = new ArrayList ();
380 }
381 createdFacets.add(name);
382 }
383
384 private UIComponent createComponent(String id) {
385 UIComponent component;
386 Application application = context.getApplication();
387 if (this.binding != null) {
388 ValueBinding vb = application.createValueBinding(this.binding);
389 component = application.createComponent(vb, context, getComponentType());
390 component.setValueBinding("binding", vb);
391 } else {
392 component = application.createComponent(getComponentType());
393 }
394 component.setId(id);
395 this.created = true;
396
397 setProperties(component);
398 return component;
399 }
400
401 private UIComponent createChild(UIComponentTag parentTag, String id) {
402 final UIComponent parent = parentTag.getComponentInstance();
403 UIComponent component = FacesUtils.getChild(parent, id);
404 if (component == null) {
405 component = createComponent(id);
406 parent.getChildren().add(component);
407 }
408
409 parentTag.addChild(component);
410 return component;
411 }
412
413 private UIComponent createFacet(UIComponentTag parentTag, String name, String id) {
414 final UIComponent parent = parentTag.getComponentInstance();
415 UIComponent component = (UIComponent) parent.getFacets().get(name);
416 if (component == null) {
417 component = createComponent(id);
418 parent.getFacets().put(name, component);
419 }
420
421 parentTag.addFacet(name);
422 return component;
423 }
424
425 private String createId() {
426 if (this.id == null) {
427 return getFacesContext().getViewRoot().createUniqueId();
428 }
429
430 return this.id;
431 }
432
433 private void removeOldChildren() {
434 List oldList = (List ) component.getAttributes().remove(CREATED_COMPONENTS);
435 if (oldList != null) {
436 if (createdComponents != null) {
437 for (Iterator olds = oldList.iterator(); olds.hasNext();) {
438 String old = (String ) olds.next();
439 if (!createdComponents.contains(old)) {
440 FacesUtils.removeChild(component, old);
441 }
442 }
443 } else {
444 for (Iterator i = oldList.iterator(); i.hasNext();) {
445 FacesUtils.removeChild(component, (String ) i.next());
446 }
447 }
448 }
449
450 if (createdComponents != null) {
451 component.getAttributes().put(CREATED_COMPONENTS, createdComponents);
452 createdComponents = null;
453 }
454 }
455
456 private void removeOldFacets() {
457 List oldList = (List ) component.getAttributes().remove(CREATED_FACETS);
458 if (oldList != null) {
459 if (createdFacets != null) {
460 for (Iterator olds = oldList.iterator(); olds.hasNext();) {
461 String old = (String ) olds.next();
462 if (!createdFacets.contains(old)) {
463 component.getFacets().remove(old);
464 }
465 }
466 } else {
467 for (Iterator olds = oldList.iterator(); olds.hasNext(); ) {
468 String old = (String ) olds.next();
469 component.getFacets().remove(old);
470 }
471 }
472 }
473
474 if (createdFacets != null) {
475 component.getAttributes().put(CREATED_FACETS, createdFacets);
476 createdFacets = null;
477 }
478 }
479
480
481
485 public String getId() {
486 return this.id;
487 }
488
489 public void setId(String id) {
490 this.id = id;
491 }
492
493 public String getBinding() {
494 return this.binding;
495 }
496
497 public void setBinding(String binding) {
498 if (!FacesUtils.isExpression(binding)) {
499 throw new IllegalArgumentException ("Binding value must be an expression");
500 }
501
502 this.binding = binding;
503 }
504
505 public String getRendered() {
506 return this.rendered;
507 }
508
509 public void setRendered(String rendered) {
510 this.rendered = rendered;
511 }
512 }
513 |
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