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1
29
30 package com.caucho.jsp.java;
31
32 import com.caucho.jsp.AnalyzedTag;
33 import com.caucho.jsp.TagInstance;
34 import com.caucho.xml.QName;
35
36 import javax.servlet.jsp.tagext.*;
37 import java.lang.reflect.Method  ;
38 import java.util.ArrayList ;
39
40
43 public class CustomTag extends GenericTag
44 {
45 protected String _bodyContent;
46
47
52 public void generate(JspJavaWriter out)
53 throws Exception
54 {
55 String name = _tag.getId();
56 String className = _tagInfo.getTagClassName();
57 String tagHackVar = "_jsp_endTagHack" + _gen.uniqueId();
58 Class cl = _tagClass;
59
60 AnalyzedTag analyzedTag = _tag.getAnalyzedTag();
61
62 boolean isIterator = (IterationTag.class.isAssignableFrom(cl) ||
63 BodyTag.class.isAssignableFrom(cl));
64 boolean isBodyTag = BodyTag.class.isAssignableFrom(cl);
65 boolean isCatch = TryCatchFinally.class.isAssignableFrom(cl);
66
67 boolean isEmpty = isEmpty();
68 boolean usesTagBody = isBodyTag && ! isEmpty &&
69 analyzedTag.getStartReturnsBuffered();
70 boolean hasEndTag = analyzedTag.getDoEnd();
71
72 if ("empty".equalsIgnoreCase(_bodyContent)) {
73 if (! isEmpty)
74 throw error(L.l("<{0}> expects an empty body", getTagName()));
75 }
76 if (usesTagBody && hasEndTag)
77 out.println("com.caucho.jsp.BodyContentImpl " + tagHackVar + " = null;");
78 else
79 tagHackVar = "out";
80
81 if (! isDeclared()) {
82 out.println("if (" + name + " == null) {");
83 out.pushDepth();
84 generateTagInit(out);
85 out.popDepth();
86 out.println("}");
87 out.println();
88 }
89
90 fillAttributes(out, name);
91
92 printVarDeclare(out, VariableInfo.AT_BEGIN);
93
94 String oldTag = "_jsp_writer" + _gen.uniqueId();
95
96 if (analyzedTag.getDoCatch())
97 out.println("javax.servlet.jsp.JspWriter " + oldTag + " = out;");
98
99 if (analyzedTag.getDoCatch() || analyzedTag.getDoFinally()) {
100 out.println("try {");
101 out.pushDepth();
102 }
103
104 boolean hasStartTag = analyzedTag.getDoStart();
105 int startCount = ((analyzedTag.getStartReturnsSkip() ? 1 : 0) +
106 (analyzedTag.getStartReturnsInclude() ? 1 : 0) +
107 (analyzedTag.getStartReturnsBuffered() ? 1 : 0));
108
109 int thisId = _gen.uniqueId();
110 if (! hasStartTag) {
111 }
112 else if (startCount == 1) {
113 out.println(name + ".doStartTag();");
114 }
115 else {
116 out.println("int _jspEval" + thisId + " = " + name + ".doStartTag();");
117 }
118 printVarAssign(out, VariableInfo.AT_BEGIN);
119
120 if (analyzedTag.getStartReturnsSkip() &&
121 ! analyzedTag.getStartReturnsInclude() &&
122 ! analyzedTag.getStartReturnsBuffered()) {
123 generateChildrenEmpty();
125 }
126 else if (isEmpty) {
127
132 }
133 else {
134 if (startCount > 1 && analyzedTag.getStartReturnsSkip()) {
135 out.println("if (_jspEval" + thisId + " != javax.servlet.jsp.tagext.Tag.SKIP_BODY) {");
136 out.pushDepth();
137 }
138 else if ((hasVarDeclaration(VariableInfo.NESTED) ||
139 childHasScriptlet()) &&
140 ! (analyzedTag.getDoCatch() ||
141 analyzedTag.getDoFinally() ||
142 analyzedTag.getDoAfter() &&
143 analyzedTag.getAfterReturnsAgain())) {
144 out.println("{");
145 out.pushDepth();
146 }
147
148 if (usesTagBody) {
149 if (analyzedTag.getStartReturnsBuffered() &&
150 analyzedTag.getStartReturnsInclude()) {
151 out.println("if (_jspEval" + thisId + " == javax.servlet.jsp.tagext.BodyTag.EVAL_BODY_BUFFERED) {");
152 out.pushDepth();
153 }
154
155 out.println("out = pageContext.pushBody();");
156
157 if (hasEndTag) {
158 out.println(tagHackVar + " = (com.caucho.jsp.BodyContentImpl) out;");
159 out.println(name + ".setBodyContent(" + tagHackVar + ");");
160 }
161 else
162 out.println(name + ".setBodyContent((javax.servlet.jsp.tagext.BodyContent) " + tagHackVar + ");");
163
164 if (analyzedTag.getDoInit())
165 out.println(name + ".doInitBody();");
166
167 if (analyzedTag.getStartReturnsBuffered() &&
168 analyzedTag.getStartReturnsInclude()) {
169 out.popDepth();
170 out.println("}");
171
172
179 }
180 }
181 else if (isBodyTag && _tag.getBodyContent())
182 out.println(name + ".setBodyContent((javax.servlet.jsp.tagext.BodyContent) null);");
183
184 if (analyzedTag.getDoAfter() && analyzedTag.getAfterReturnsAgain()) {
185 out.println("do {");
186 out.pushDepth();
187 }
188
189 out.setLocation(getFilename(), getStartLine());
190
191 if (_children != null)
192 printVarDeclaration(out, VariableInfo.NESTED);
193
194 out.setLocation(getFilename(), getStartLine());
195
196 generateChildren(out);
197
198 out.setLocation(getFilename(), getEndLine());
199
200 if (analyzedTag.getDoAfter() && analyzedTag.getAfterReturnsAgain()) {
201 out.popDepth();
202 out.println("} while (" + name + ".doAfterBody() == javax.servlet.jsp.tagext.IterationTag.EVAL_BODY_AGAIN);");
203 }
204 else if (analyzedTag.getDoAfter()) {
205 out.println(name + ".doAfterBody();");
206 }
207
208 if (usesTagBody) {
209 if (analyzedTag.getStartReturnsBuffered() &&
210 analyzedTag.getStartReturnsInclude()) {
211 out.println("if (_jspEval" + thisId + " == javax.servlet.jsp.tagext.BodyTag.EVAL_BODY_BUFFERED)");
212
213 if (hasEndTag)
214 out.println(" out = pageContext.popBody();");
215 else
216 out.println(" out = pageContext.popAndReleaseBody();");
217 }
218 else if (analyzedTag.getStartReturnsBuffered()) {
219 if (hasEndTag)
220 out.println("out = pageContext.popBody();");
221 else
222 out.println("out = pageContext.popAndReleaseBody();");
223 }
224 }
225
226 if (startCount > 1 && analyzedTag.getStartReturnsSkip()) {
227 out.popDepth();
228 out.println("}");
229 }
230 else if (isEmpty) {
231 }
232 else if ((hasVarDeclaration(VariableInfo.NESTED) ||
233 childHasScriptlet()) &&
234 ! (analyzedTag.getDoCatch() ||
235 analyzedTag.getDoFinally() ||
236 analyzedTag.getDoAfter() &&
237 analyzedTag.getAfterReturnsAgain())) {
238 out.popDepth();
239 out.println("}");
240 }
241 }
242
243 out.setLocation(getFilename(), getEndLine());
244
245 int endCount = ((analyzedTag.getEndReturnsSkip() ? 1 : 0) +
246 (analyzedTag.getEndReturnsEval() ? 1 : 0));
247
248 String endVar = "_jsp_end_" + _gen.uniqueId();
249
250 if (! hasEndTag) {
251 }
252 else if (endCount > 1)
253 out.println("int " + endVar + " = " + name + ".doEndTag();");
254 else
255 out.println(name + ".doEndTag();");
256
257 if (! hasEndTag || ! usesTagBody) {
258 }
259 else if (hasStartTag &&
260 (analyzedTag.getStartReturnsSkip() ||
261 analyzedTag.getStartReturnsInclude())) {
262 out.println("if (" + tagHackVar + " != null) {");
263 out.println(" pageContext.releaseBody(" + tagHackVar + ");");
264 out.println(" " + tagHackVar + " = null;");
265 out.println("}");
266 }
267 else {
268 out.println("pageContext.releaseBody(" + tagHackVar + ");");
269 }
270
271 if (analyzedTag.getEndReturnsSkip()) {
272 if (hasEndTag && endCount > 1)
273 out.println("if (" + endVar + " == javax.servlet.jsp.tagext.Tag.SKIP_PAGE)");
274 else
275 out.println("if (true)");
276
277 if (_gen.isTag() || isInFragment())
278 out.println(" throw new SkipPageException();");
279 else
280 out.println(" return;");
281 }
282
283 if (analyzedTag.getDoCatch()) {
284 String t = "_jsp_exn_" + _gen.uniqueId();
285
286 out.popDepth();
287 out.println("} catch (Throwable " + t + ") {");
288 out.println(" pageContext.setWriter(" + oldTag + ");");
289 out.println(" out = " + oldTag + ";");
290 out.println(" " + name + ".doCatch(" + t + ");");
291 out.pushDepth();
292 }
293
294 if (analyzedTag.getDoFinally()) {
295 out.popDepth();
296 out.println("} finally {");
297 out.println(" " + name + ".doFinally();");
298 out.pushDepth();
299 }
300
301 if (analyzedTag.getDoCatch() || analyzedTag.getDoFinally()) {
302 out.popDepth();
303 out.println("}");
304 }
305
306 printVarDeclaration(out, VariableInfo.AT_END);
307
308 out.setLocation(getFilename(), getEndLine());
309 }
310
311
315 private boolean tagImplementsMethod(Class cl, String name)
316 throws NoSuchMethodException
317 {
318 Method method;
319
320 try {
321 method = cl.getMethod(name, new Class [0]);
322 } catch (Exception e) {
323 return false;
324 }
325
326 if (method == null)
327 return false;
328
329 Class declaringClass = method.getDeclaringClass();
330
331 return (! declaringClass.equals(TagSupport.class) &&
332 ! declaringClass.equals(BodyTagSupport.class));
333 }
334
335
340 private void generateTagInit(JspJavaWriter out)
341 throws Exception
342 {
343 TagInstance parent = _tag.getParent();
344 String id = _tag.getId();
345
346 String var = _tag.getId();
347 String className = _tag.getTagClass().getName();
348
349 out.print(var + " = new ");
350 out.printClass(_tag.getTagClass());
351 out.println("();");
352
353 if (JspIdConsumer.class.isAssignableFrom(_tag.getTagClass())) {
354 String shortName = className;
355 int p = shortName.lastIndexOf('.');
356 if (p >= 0)
357 shortName = shortName.substring(p + 1);
358
359 out.print(var + ".setJspId(\"" + shortName + "-" + _gen.generateJspId() + "\");");
360 }
361
362 if (_tag.getAnalyzedTag().getHasInjection()) {
363 out.println("_jsp_inject_" + _tag.getId() + ".configure(" + var + ");");
364 }
365
366 AnalyzedTag analyzedTag = _tag.getAnalyzedTag();
367
368 JspNode parentTagNode = getParent().getParentTagNode();
369
370 out.println(var + ".setPageContext(pageContext);");
371 if (parentTagNode == null) {
372 out.println(var + ".setParent((javax.servlet.jsp.tagext.Tag) null);");
373 }
374 else if (parentTagNode.isSimpleTag()) {
375 String parentName = parentTagNode.getCustomTagName();
376
377 out.println("if (" + parentName + "_adapter == null)");
378 out.println(" " + parentName + "_adapter = new javax.servlet.jsp.tagext.TagAdapter(" + parentName + ");");
379 out.println(var + ".setParent(" + parentName + "_adapter);");
380 }
381 else {
382 String parentName = parentTagNode.getCustomTagName();
383
384 out.println(var + ".setParent((javax.servlet.jsp.tagext.Tag) " + parentName + ");");
385 }
386
387 ArrayList <QName> names = _tag.getAttributeNames();
388 for (int i = 0; i < names.size(); i++) {
389 QName name = names.get(i);
390
391 String value = _tag.getAttribute(name);
392 if (value == null)
393 continue;
394
395 TagAttributeInfo attrInfo = _tag.getAttributeInfo(name.getLocalName());
396
397 generateSetAttribute(out, var, name, value, false, false, attrInfo);
398 }
399 }
400
401
404 private boolean childHasScriptlet()
405 {
406 ArrayList <JspNode> children = getChildren();
407
408 if (children == null)
409 return false;
410
411 for (int i = 0; i < children.size(); i++) {
412 JspNode child = children.get(i);
413
414 if (child instanceof JspScriptlet || child instanceof JspExpression)
415 return true;
416 }
417
418 return false;
419 }
420 }
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