XslElementpublic final class XslElement extends Instruction
| Fields Summary |
|---|
| private String | _prefix | | private boolean | _ignore | | private boolean | _isLiteralName | | private AttributeValueTemplate | _name | | private AttributeValueTemplate | _namespace |
| Methods Summary |
|---|
| public boolean | declaresDefaultNS()This method is now deprecated. The new implemation of this class
never declares the default NS.
return false;
| | public void | display(int indent)Displays the contents of the element
indent(indent);
Util.println("Element " + _name);
displayContents(indent + IndentIncrement);
| | public void | parseContents(com.sun.org.apache.xalan.internal.xsltc.compiler.Parser parser)
final SymbolTable stable = parser.getSymbolTable();
// Handle the 'name' attribute
String name = getAttribute("name");
if (name == EMPTYSTRING) {
ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR,
name, this);
parser.reportError(WARNING, msg);
parseChildren(parser);
_ignore = true; // Ignore the element if the QName is invalid
return;
}
// Get namespace attribute
String namespace = getAttribute("namespace");
// Optimize compilation when name is known at compile time
_isLiteralName = Util.isLiteral(name);
if (_isLiteralName) {
if (!XMLChar.isValidQName(name)) {
ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR,
name, this);
parser.reportError(WARNING, msg);
parseChildren(parser);
_ignore = true; // Ignore the element if the QName is invalid
return;
}
final QName qname = parser.getQNameSafe(name);
String prefix = qname.getPrefix();
String local = qname.getLocalPart();
if (prefix == null) {
prefix = EMPTYSTRING;
}
if (!hasAttribute("namespace")) {
namespace = lookupNamespace(prefix);
if (namespace == null) {
ErrorMsg err = new ErrorMsg(ErrorMsg.NAMESPACE_UNDEF_ERR,
prefix, this);
parser.reportError(WARNING, err);
parseChildren(parser);
_ignore = true; // Ignore the element if prefix is undeclared
return;
}
_prefix = prefix;
_namespace = new AttributeValueTemplate(namespace, parser, this);
}
else {
if (prefix == EMPTYSTRING) {
if (Util.isLiteral(namespace)) {
prefix = lookupPrefix(namespace);
if (prefix == null) {
prefix = stable.generateNamespacePrefix();
}
}
// Prepend prefix to local name
final StringBuffer newName = new StringBuffer(prefix);
if (prefix != EMPTYSTRING) {
newName.append(':");
}
name = newName.append(local).toString();
}
_prefix = prefix;
_namespace = new AttributeValueTemplate(namespace, parser, this);
}
}
else {
_namespace = (namespace == EMPTYSTRING) ? null :
new AttributeValueTemplate(namespace, parser, this);
}
_name = new AttributeValueTemplate(name, parser, this);
final String useSets = getAttribute("use-attribute-sets");
if (useSets.length() > 0) {
if (!Util.isValidQNames(useSets)) {
ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, useSets, this);
parser.reportError(Constants.ERROR, err);
}
setFirstElement(new UseAttributeSets(useSets, parser));
}
parseChildren(parser);
| | public void | translate(com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator classGen, com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator methodGen)At runtime the compilation of xsl:element results in code that: (i)
evaluates the avt for the name, (ii) checks for a prefix in the name
(iii) generates a new prefix and create a new qname when necessary
(iv) calls startElement() on the handler (v) looks up a uri in the XML
when the prefix is not known at compile time (vi) calls namespace()
on the handler (vii) evaluates the contents (viii) calls endElement().
LocalVariableGen local = null;
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Optimize translation if element name is a literal
if (_isLiteralName) {
translateLiteral(classGen, methodGen);
return;
}
if (!_ignore) {
// if the qname is an AVT, then the qname has to be checked at runtime if it is a valid qname
LocalVariableGen nameValue = methodGen.addLocalVariable2("nameValue",
Util.getJCRefType(STRING_SIG),
il.getEnd());
// store the name into a variable first so _name.translate only needs to be called once
_name.translate(classGen, methodGen);
il.append(new ASTORE(nameValue.getIndex()));
il.append(new ALOAD(nameValue.getIndex()));
// call checkQName if the name is an AVT
final int check = cpg.addMethodref(BASIS_LIBRARY_CLASS, "checkQName",
"("
+STRING_SIG
+")V");
il.append(new INVOKESTATIC(check));
// Push handler for call to endElement()
il.append(methodGen.loadHandler());
// load name value again
il.append(new ALOAD(nameValue.getIndex()));
if (_namespace != null) {
_namespace.translate(classGen, methodGen);
}
else {
il.append(ACONST_NULL);
}
// Push additional arguments
il.append(methodGen.loadHandler());
il.append(methodGen.loadDOM());
il.append(methodGen.loadCurrentNode());
// Invoke BasisLibrary.startXslElemCheckQName()
il.append(new INVOKESTATIC(
cpg.addMethodref(BASIS_LIBRARY_CLASS, "startXslElement",
"(" + STRING_SIG
+ STRING_SIG
+ TRANSLET_OUTPUT_SIG
+ DOM_INTF_SIG + "I)" + STRING_SIG)));
}
translateContents(classGen, methodGen);
if (!_ignore) {
il.append(methodGen.endElement());
}
| | public void | translateContents(com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator classGen, com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator methodGen)Override this method to make sure that xsl:attributes are not
copied to output if this xsl:element is to be ignored
final int n = elementCount();
for (int i = 0; i < n; i++) {
final SyntaxTreeNode item =
(SyntaxTreeNode)getContents().elementAt(i);
if (_ignore && item instanceof XslAttribute) continue;
item.translate(classGen, methodGen);
}
| | public void | translateLiteral(com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator classGen, com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator methodGen)This method is called when the name of the element is known at compile time.
In this case, there is no need to inspect the element name at runtime to
determine if a prefix exists, needs to be generated, etc.
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
if (!_ignore) {
il.append(methodGen.loadHandler());
_name.translate(classGen, methodGen);
il.append(DUP2);
il.append(methodGen.startElement());
if (_namespace != null) {
il.append(methodGen.loadHandler());
il.append(new PUSH(cpg, _prefix));
_namespace.translate(classGen,methodGen);
il.append(methodGen.namespace());
}
}
translateContents(classGen, methodGen);
if (!_ignore) {
il.append(methodGen.endElement());
}
| | public com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type | typeCheck(com.sun.org.apache.xalan.internal.xsltc.compiler.SymbolTable stable)Run type check on element name & contents
if (!_ignore) {
_name.typeCheck(stable);
if (_namespace != null) {
_namespace.typeCheck(stable);
}
}
typeCheckContents(stable);
return Type.Void;
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