/**
* If the children of a variable is a single xsl:value-of or text literal, it is cheaper to
* evaluate this as an expression, so try and adapt the child an an expression.
*
* @param varElem Should be a ElemParam, ElemVariable, or ElemWithParam.
* @return An XPath if rewrite is possible, else null.
* @throws javax.xml.transform.TransformerException
*/
static XPath rewriteChildToExpression(ElemTemplateElement varElem) throws TransformerException {
ElemTemplateElement t = varElem.getFirstChildElem();
// Down the line this can be done with multiple string objects using
// the concat function.
if (null != t && null == t.getNextSiblingElem()) {
int etype = t.getXSLToken();
if (Constants.ELEMNAME_VALUEOF == etype) {
ElemValueOf valueof = (ElemValueOf) t;
// %TBD% I'm worried about extended attributes here.
if (valueof.getDisableOutputEscaping() == false && valueof.getDOMBackPointer() == null) {
varElem.m_firstChild = null;
return new XPath(new XRTreeFragSelectWrapper(valueof.getSelect().getExpression()));
}
} else if (Constants.ELEMNAME_TEXTLITERALRESULT == etype) {
ElemTextLiteral lit = (ElemTextLiteral) t;
if (lit.getDisableOutputEscaping() == false && lit.getDOMBackPointer() == null) {
String str = lit.getNodeValue();
XString xstr = new XString(str);
varElem.m_firstChild = null;
return new XPath(new XRTreeFragSelectWrapper(xstr));
}
}
}
return null;
}
public void compose(StylesheetRoot sroot) throws TransformerException {
super.compose(sroot);
String prefix = getPrefix();
String declNamespace = getNamespaceForPrefix(prefix);
String lang = null;
String srcURL = null;
String scriptSrc = null;
if (null == declNamespace)
throw new TransformerException(
XSLMessages.createMessage(
XSLTErrorResources.ER_NO_NAMESPACE_DECL, new Object[] {prefix}));
// "Prefix " + prefix does not have a corresponding namespace declaration");
for (ElemTemplateElement child = getFirstChildElem();
child != null;
child = child.getNextSiblingElem()) {
if (Constants.ELEMNAME_EXTENSIONSCRIPT == child.getXSLToken()) {
ElemExtensionScript sdecl = (ElemExtensionScript) child;
lang = sdecl.getLang();
srcURL = sdecl.getSrc();
ElemTemplateElement childOfSDecl = sdecl.getFirstChildElem();
if (null != childOfSDecl) {
if (Constants.ELEMNAME_TEXTLITERALRESULT == childOfSDecl.getXSLToken()) {
ElemTextLiteral tl = (ElemTextLiteral) childOfSDecl;
char[] chars = tl.getChars();
scriptSrc = new String(chars);
if (scriptSrc.trim().length() == 0) scriptSrc = null;
}
}
}
}
if (null == lang) lang = "javaclass";
if (lang.equals("javaclass") && (scriptSrc != null))
throw new TransformerException(
XSLMessages.createMessage(
XSLTErrorResources.ER_ELEM_CONTENT_NOT_ALLOWED, new Object[] {scriptSrc}));
// "Element content not allowed for lang=javaclass " + scriptSrc);
// Register the extension namespace if it has not already been registered.
ExtensionNamespaceSupport extNsSpt = null;
ExtensionNamespacesManager extNsMgr = sroot.getExtensionNamespacesManager();
if (extNsMgr.namespaceIndex(declNamespace, extNsMgr.getExtensions()) == -1) {
if (lang.equals("javaclass")) {
if (null == srcURL) {
extNsSpt = extNsMgr.defineJavaNamespace(declNamespace);
} else if (extNsMgr.namespaceIndex(srcURL, extNsMgr.getExtensions()) == -1) {
extNsSpt = extNsMgr.defineJavaNamespace(declNamespace, srcURL);
}
} else // not java
{
String handler = "org.apache.xalan.extensions.ExtensionHandlerGeneral";
Object[] args = {
declNamespace, this.m_elements, this.m_functions, lang, srcURL, scriptSrc, getSystemId()
};
extNsSpt = new ExtensionNamespaceSupport(declNamespace, handler, args);
}
}
if (extNsSpt != null) extNsMgr.registerExtension(extNsSpt);
}