 protected String[] generateJava() throws Exception {
String[] smapStr = null;
long t1, t2, t3, t4;
t1 = t2 = t3 = t4 = 0;
if (log.isDebugEnabled()) {
t1 = System.currentTimeMillis();
}
// Setup page info area
pageInfo = new PageInfo(new BeanRepository(ctxt.getClassLoader(),
errDispatcher), ctxt.getJspFile());
JspConfig jspConfig = options.getJspConfig();
JspConfig.JspProperty jspProperty = jspConfig.findJspProperty(ctxt
.getJspFile());
/*
* If the current uri is matched by a pattern specified in a
* jsp-property-group in web.xml, initialize pageInfo with those
* properties.
*/
if (jspProperty.isELIgnored() != null) {
pageInfo.setELIgnored(JspUtil.booleanValue(jspProperty
.isELIgnored()));
}
if (jspProperty.isScriptingInvalid() != null) {
pageInfo.setScriptingInvalid(JspUtil.booleanValue(jspProperty
.isScriptingInvalid()));
}
if (jspProperty.getIncludePrelude() != null) {
pageInfo.setIncludePrelude(jspProperty.getIncludePrelude());
}
if (jspProperty.getIncludeCoda() != null) {
pageInfo.setIncludeCoda(jspProperty.getIncludeCoda());
}
if (jspProperty.isDeferedSyntaxAllowedAsLiteral() != null) {
pageInfo.setDeferredSyntaxAllowedAsLiteral(JspUtil.booleanValue(jspProperty
.isDeferedSyntaxAllowedAsLiteral()));
}
if (jspProperty.isTrimDirectiveWhitespaces() != null) {
pageInfo.setTrimDirectiveWhitespaces(JspUtil.booleanValue(jspProperty
.isTrimDirectiveWhitespaces()));
}
if (ctxt.isTagFile()) {
try {
double libraryVersion = Double.parseDouble(ctxt.getTagInfo()
.getTagLibrary().getRequiredVersion());
if (libraryVersion < 2.0) {
pageInfo.setIsELIgnored("true", null, errDispatcher, true);
}
if (libraryVersion < 2.1) {
pageInfo.setDeferredSyntaxAllowedAsLiteral("true", null,
errDispatcher, true);
}
} catch (NumberFormatException ex) {
errDispatcher.jspError(ex);
}
}
ctxt.checkOutputDir();
String javaFileName = ctxt.getServletJavaFileName();
ServletWriter writer = null;
try {
/*
* The setting of isELIgnored changes the behaviour of the parser
* in subtle ways. To add to the 'fun', isELIgnored can be set in
* any file that forms part of the translation unit so setting it
* in a file included towards the end of the translation unit can
* change how the parser should have behaved when parsing content
* up to the point where isELIgnored was set. Arghh!
* Previous attempts to hack around this have only provided partial
* solutions. We now use two passes to parse the translation unit.
* The first just parses the directives and the second parses the
* whole translation unit once we know how isELIgnored has been set.
* TODO There are some possible optimisations of this process.
*/
// Parse the file
ParserController parserCtl = new ParserController(ctxt, this);
// Pass 1 - the directives
Node.Nodes directives =
parserCtl.parseDirectives(ctxt.getJspFile());
Validator.validateDirectives(this, directives);
// Pass 2 - the whole translation unit
pageNodes = parserCtl.parse(ctxt.getJspFile());
if (ctxt.isPrototypeMode()) {
// generate prototype .java file for the tag file
writer = setupContextWriter(javaFileName);
Generator.generate(writer, this, pageNodes);
writer.close();
writer = null;
return null;
}
// Validate and process attributes - don't re-validate the
// directives we validated in pass 1
Validator.validateExDirectives(this, pageNodes);
if (log.isDebugEnabled()) {
t2 = System.currentTimeMillis();
}
// Collect page info
Collector.collect(this, pageNodes);
// Compile (if necessary) and load the tag files referenced in
// this compilation unit.
tfp = new TagFileProcessor();
tfp.loadTagFiles(this, pageNodes);
if (log.isDebugEnabled()) {
t3 = System.currentTimeMillis();
}
// Determine which custom tag needs to declare which scripting vars
ScriptingVariabler.set(pageNodes, errDispatcher);
// Optimizations by Tag Plugins
TagPluginManager tagPluginManager = options.getTagPluginManager();
tagPluginManager.apply(pageNodes, errDispatcher, pageInfo);
// Optimization: concatenate contiguous template texts.
TextOptimizer.concatenate(this, pageNodes);
// Generate static function mapper codes.
ELFunctionMapper.map(this, pageNodes);
// generate servlet .java file
writer = setupContextWriter(javaFileName);
Generator.generate(writer, this, pageNodes);
writer.close();
writer = null;
// The writer is only used during the compile, dereference
// it in the JspCompilationContext when done to allow it
// to be GC'd and save memory.
ctxt.setWriter(null);
if (log.isDebugEnabled()) {
t4 = System.currentTimeMillis();
log.debug("Generated " + javaFileName + " total=" + (t4 - t1)
+ " generate=" + (t4 - t3) + " validate=" + (t2 - t1));
}
} catch (Exception e) {
if (writer != null) {
try {
writer.close();
writer = null;
} catch (Exception e1) {
// do nothing
}
}
// Remove the generated .java file
new File(javaFileName).delete();
throw e;
} finally {
if (writer != null) {
try {
writer.close();
} catch (Exception e2) {
// do nothing
}
}
}
// JSR45 Support
if (!options.isSmapSuppressed()) {
smapStr = SmapUtil.generateSmap(ctxt, pageNodes);
}
// If any proto type .java and .class files was generated,
// the prototype .java may have been replaced by the current
// compilation (if the tag file is self referencing), but the
// .class file need to be removed, to make sure that javac would
// generate .class again from the new .java file just generated.
tfp.removeProtoTypeFiles(ctxt.getClassFileName());
return smapStr;
}
Compile the jsp file into equivalent servlet in .java file | org.apache.jasper.compiler.Compiler
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abstract protected void