* Compiles and loads a tagfile.
*/
private Class loadTagFile(Compiler compiler, String tagFilePath,
TagInfo tagInfo, PageInfo parentPageInfo) throws JasperException {
JspCompilationContext ctxt = compiler.getCompilationContext();
JspRuntimeContext rctxt = ctxt.getRuntimeContext();
JspServletWrapper wrapper = (JspServletWrapper) rctxt
.getWrapper(tagFilePath);
synchronized (rctxt) {
if (wrapper == null) {
wrapper = new JspServletWrapper(ctxt.getServletContext(), ctxt
.getOptions(), tagFilePath, tagInfo, ctxt
.getRuntimeContext(), ctxt.getTagFileJarUrl(tagFilePath));
rctxt.addWrapper(tagFilePath, wrapper);
// Use same classloader and classpath for compiling tag files
wrapper.getJspEngineContext().setClassLoader(ctxt.getClassLoader());
wrapper.getJspEngineContext().setClassPath(ctxt.getClassPath());
} else {
// Make sure that JspCompilationContext gets the latest TagInfo
// for the tag file. TagInfo instance was created the last
// time the tag file was scanned for directives, and the tag
// file may have been modified since then.
wrapper.getJspEngineContext().setTagInfo(tagInfo);
}
Class tagClazz;
int tripCount = wrapper.incTripCount();
try {
if (tripCount > 0) {
// When tripCount is greater than zero, a circular
// dependency exists. The circularily dependant tag
// file is compiled in prototype mode, to avoid infinite
// recursion.
JspServletWrapper tempWrapper = new JspServletWrapper(ctxt
.getServletContext(), ctxt.getOptions(),
tagFilePath, tagInfo, ctxt.getRuntimeContext(),
ctxt.getTagFileJarUrl(tagFilePath));
tagClazz = tempWrapper.loadTagFilePrototype();
tempVector.add(tempWrapper.getJspEngineContext()
.getCompiler());
} else {
tagClazz = wrapper.loadTagFile();