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1
64
65 package com.jcorporate.expresso.ext.struts.taglib.logic;
66
67 import com.jcorporate.expresso.core.controller.Block;
68 import com.jcorporate.expresso.core.controller.ControllerElement;
69 import com.jcorporate.expresso.core.misc.StringUtil;
70 import com.jcorporate.expresso.ext.struts.taglib.ControllerUtils;
71 import org.apache.log4j.Logger;
72 import org.apache.struts.taglib.logic.IterateTag;
73 import org.apache.struts.util.RequestUtils;
74
75 import javax.servlet.jsp.JspException  ;
76 import java.util.ArrayList ;
77 import java.util.Vector ;
78
79
80
105 public class ExIterateTag
106 extends IterateTag {
107 private static Logger log = Logger.getLogger("expresso.ext.struts.taglib.logic.ExIterateTag");
108
109 public ExIterateTag() {
110 super();
111 }
112
113
120 public int doStartTag()
121 throws JspException {
122 Vector v = null;
123
124 if (property == null) {
125 if (name == null) {
126 throw new JspException ("Property and name may not both be null");
127 }
128
129 ControllerElement ce = ControllerUtils.findElement(pageContext,
130 name, null);
131 collection = ce;
132
133 if (ce != null) {
134 iterator = ce.getNestedIterator();
135 } else {
136 throw new JspException ("No such ControllerElement '" +
137 name + "' in session");
138 }
139 } else if (property.equalsIgnoreCase("blocks")) {
140 if (name != null) {
141 ControllerElement ce = ControllerUtils.findElement(pageContext, name, null);
142
143 if (ce instanceof Block) {
144 Block b = (Block) ce;
145 collection = ce;
146 v = b.getBlocks();
147
148 if (v != null) {
149 iterator = new ArrayList (v).iterator();
150 }
151 } else {
152 throw new JspException ("You cannot request nested blocks from '" +
153 name + "', it is not a block");
154 }
155 } else {
156 v = ControllerUtils.getResponse(pageContext).getBlocks();
157
158 if (v != null) {
159 collection = v;
160 iterator = new ArrayList (v).iterator();
161 }
162 }
163 } else if (property.equalsIgnoreCase("transitions")) {
164 if (name != null) {
165 ControllerElement ce = ControllerUtils.findElement(pageContext, name, null);
166
167 if (ce instanceof Block) {
168 Block b = (Block) ce;
169 collection = ce;
170 v = b.getTransitions();
171
172 if (v != null) {
173 iterator = new ArrayList (v).iterator();
174 }
175 } else {
176 throw new JspException ("You cannot request nested blocks from '" +
177 name + "', it is not a block");
178 }
179 } else {
180 v = ControllerUtils.getResponse(pageContext).getTransitions();
181
182 if (v != null) {
183 collection = v;
184 iterator = new ArrayList (v).iterator();
185 }
186 }
187 } else if (property.equalsIgnoreCase("inputs")) {
188 if (name != null) {
189 ControllerElement ce = ControllerUtils.findElement(pageContext, name, null);
190
191 if (ce instanceof Block) {
192 Block b = (Block) ce;
193 collection = ce;
194 v = b.getInputs();
195
196 if (v != null) {
197 iterator = new ArrayList (v).iterator();
198 }
199 } else {
200 throw new JspException ("You cannot request nested blocks from '" +
201 name + "', it is not a block");
202 }
203 } else {
204 v = ControllerUtils.getResponse(pageContext).getInputs();
205
206 if (v != null) {
207 collection = v;
208 iterator = new ArrayList (v).iterator();
209 }
210 }
211
212 } else if (property.equalsIgnoreCase("outputs")) {
213 if (log.isDebugEnabled()) {
214 log.debug("Iterating over all outputs");
215 }
216
217 if (name != null) {
218 ControllerElement ce = ControllerUtils.findElement(pageContext, name, null);
219
220 if (ce instanceof Block) {
221 Block b = (Block) ce;
222 collection = ce;
223 v = b.getOutputs();
224
225 if (v != null) {
226 iterator = new ArrayList (v).iterator();
227 }
228 } else {
229 throw new JspException ("You cannot request nested blocks from '" +
230 name + "', it is not a block");
231 }
232 } else {
233 v = ControllerUtils.getResponse(pageContext).getOutputs();
234
235 if (v != null) {
236 collection = v;
237 iterator = new ArrayList (v).iterator();
238 } else {
239 if (log.isDebugEnabled()) {
240 log.debug("Got no outputs!");
241 }
242 }
243 }
244
245
246 } else if (property.equalsIgnoreCase("nested")) {
247 if (log.isDebugEnabled()) {
248 log.debug("Iterating over all nested controller elements generically");
249 }
250
251 if (name != null) {
252 ControllerElement ce = ControllerUtils.findElement(pageContext, name, null);
253
254 v = ce.getNested();
257 if (v != null) {
258 iterator = new ArrayList (v).iterator();
259 } else {
260 throw new JspException ("The controller element '" +
261 name + "', does not contain any nested elements");
262 }
263 } else {
264
269 v = new Vector ();
270 Vector tmp = ControllerUtils.getResponse(pageContext).getInputs();
271 if (tmp != null) {
272 v.addAll(tmp);
273 }
274 tmp = ControllerUtils.getResponse(pageContext).getOutputs();
275 if (tmp != null) {
276 v.addAll(tmp);
277 }
278 tmp = ControllerUtils.getResponse(pageContext).getTransitions();
279 if (tmp != null) {
280 v.addAll(tmp);
281 }
282 tmp = ControllerUtils.getResponse(pageContext).getBlocks();
283 if (tmp != null) {
284 v.addAll(tmp);
285 }
286
287 collection = v;
288 iterator = new ArrayList (v).iterator();
289 if (v.size() < 0 && log.isDebugEnabled()) {
290 log.debug("MVC Controller did not generate any controller elements!");
291 }
292 }
293 } else {
294 ControllerElement ce = ControllerUtils.findElement(pageContext,
295 name,
296 property);
297 collection = ce;
298
299 if (ce != null) {
300 iterator = ce.getNestedIterator();
301 }
302 }
303 if (collection == null) {
304 JspException e = new JspException (messages.getMessage("iterate.collection"));
305 RequestUtils.saveException(pageContext, e);
306 throw e;
307 }
308 if (offset == null) {
310 offsetValue = 0;
311 } else {
312 try {
313 offsetValue = Integer.parseInt(offset);
314 } catch (NumberFormatException e) {
315 Integer offsetObject = (Integer ) pageContext.findAttribute(offset);
316
317 if (offsetObject == null) {
318 offsetValue = 0;
319 } else {
320 offsetValue = offsetObject.intValue();
321 }
322 }
323 }
324 if (offsetValue < 0) {
325 offsetValue = 0;
326 }
327 if (length == null) {
329 lengthValue = 0;
330 } else {
331 try {
332 lengthValue = Integer.parseInt(length);
333 } catch (NumberFormatException e) {
334 Integer lengthObject = (Integer ) pageContext.findAttribute(length);
335
336 if (lengthObject == null) {
337 lengthValue = 0;
338 } else {
339 lengthValue = lengthObject.intValue();
340 }
341 }
342 }
343 if (lengthValue < 0) {
344 lengthValue = 0;
345 }
346
347 lengthCount = 0;
348
349 for (int i = 0; i < offsetValue; i++) {
351 if (iterator.hasNext()) {
352 iterator.next();
353 }
354 }
355 if (iterator == null) {
356 throw new JspException ("No nested elements for bean '" +
357 StringUtil.notNull(name) + "', property '" +
358 StringUtil.notNull(property) + "'");
359 }
360 if (iterator.hasNext()) {
362 Object element = iterator.next();
363
364 if (element == null) {
365 pageContext.removeAttribute(id);
366 } else {
367 pageContext.setAttribute(id, element);
368 }
369
370 lengthCount++;
371 started = true;
372
373 if (indexId != null) {
374 pageContext.setAttribute(indexId, new Integer (getIndex()));
375 }
376
377 return (EVAL_BODY_BUFFERED);
379 } else {
380 return (SKIP_BODY);
381 }
382 }
383 }
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