public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
if (!_isLiteral) {
// if the ncname is an AVT, then the ncname has to be checked at runtime if it is a valid
// ncname
LocalVariableGen nameValue =
methodGen.addLocalVariable2("nameValue", Util.getJCRefType(STRING_SIG), null);
// store the name into a variable first so _name.translate only needs to be called once
_name.translate(classGen, methodGen);
nameValue.setStart(il.append(new ASTORE(nameValue.getIndex())));
il.append(new ALOAD(nameValue.getIndex()));
// call checkNCName if the name is an AVT
final int check =
cpg.addMethodref(BASIS_LIBRARY_CLASS, "checkNCName", "(" + STRING_SIG + ")V");
il.append(new INVOKESTATIC(check));
// Save the current handler base on the stack
il.append(methodGen.loadHandler());
il.append(DUP); // first arg to "attributes" call
// load name value again
nameValue.setEnd(il.append(new ALOAD(nameValue.getIndex())));
} else {
// Save the current handler base on the stack
il.append(methodGen.loadHandler());
il.append(DUP); // first arg to "attributes" call
// Push attribute name
_name.translate(classGen, methodGen); // 2nd arg
}
il.append(classGen.loadTranslet());
il.append(
new GETFIELD(
cpg.addFieldref(TRANSLET_CLASS, "stringValueHandler", STRING_VALUE_HANDLER_SIG)));
il.append(DUP);
il.append(methodGen.storeHandler());
// translate contents with substituted handler
translateContents(classGen, methodGen);
// get String out of the handler
il.append(
new INVOKEVIRTUAL(
cpg.addMethodref(STRING_VALUE_HANDLER, "getValueOfPI", "()" + STRING_SIG)));
// call "processingInstruction"
final int processingInstruction =
cpg.addInterfaceMethodref(
TRANSLET_OUTPUT_INTERFACE,
"processingInstruction",
"(" + STRING_SIG + STRING_SIG + ")V");
il.append(new INVOKEINTERFACE(processingInstruction, 3));
// Restore old handler base from stack
il.append(methodGen.storeHandler());
}
/**
* Compile a topLevel() method into the output class. This method is called from transform() to
* handle all non-template top-level elements. Returns the signature of the topLevel() method.
*
* <p>Global variables/params and keys are first sorted to resolve dependencies between them. The
* XSLT 1.0 spec does not allow a key to depend on a variable. However, for compatibility with
* Xalan interpretive, that type of dependency is allowed. Note also that the buildKeys() method
* is still generated as it is used by the LoadDocument class, but it no longer called from
* transform().
*/
private String compileTopLevel(ClassGenerator classGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final com.sun.org.apache.bcel.internal.generic.Type[] argTypes = {
Util.getJCRefType(DOM_INTF_SIG),
Util.getJCRefType(NODE_ITERATOR_SIG),
Util.getJCRefType(TRANSLET_OUTPUT_SIG)
};
final String[] argNames = {DOCUMENT_PNAME, ITERATOR_PNAME, TRANSLET_OUTPUT_PNAME};
final InstructionList il = new InstructionList();
final MethodGenerator toplevel =
new MethodGenerator(
ACC_PUBLIC,
com.sun.org.apache.bcel.internal.generic.Type.VOID,
argTypes,
argNames,
"topLevel",
_className,
il,
classGen.getConstantPool());
toplevel.addException("com.sun.org.apache.xalan.internal.xsltc.TransletException");
// Define and initialize 'current' variable with the root node
final LocalVariableGen current =
toplevel.addLocalVariable(
"current", com.sun.org.apache.bcel.internal.generic.Type.INT, null, null);
final int setFilter =
cpg.addInterfaceMethodref(
DOM_INTF, "setFilter", "(Lcom/sun/org/apache/xalan/internal/xsltc/StripFilter;)V");
final int gitr = cpg.addInterfaceMethodref(DOM_INTF, "getIterator", "()" + NODE_ITERATOR_SIG);
il.append(toplevel.loadDOM());
il.append(new INVOKEINTERFACE(gitr, 1));
il.append(toplevel.nextNode());
current.setStart(il.append(new ISTORE(current.getIndex())));
// Create a new list containing variables/params + keys
Vector varDepElements = new Vector(_globals);
Enumeration elements = elements();
while (elements.hasMoreElements()) {
final Object element = elements.nextElement();
if (element instanceof Key) {
varDepElements.add(element);
}
}
// Determine a partial order for the variables/params and keys
varDepElements = resolveDependencies(varDepElements);
// Translate vars/params and keys in the right order
final int count = varDepElements.size();
for (int i = 0; i < count; i++) {
final TopLevelElement tle = (TopLevelElement) varDepElements.elementAt(i);
tle.translate(classGen, toplevel);
if (tle instanceof Key) {
final Key key = (Key) tle;
_keys.put(key.getName(), key);
}
}
// Compile code for other top-level elements
Vector whitespaceRules = new Vector();
elements = elements();
while (elements.hasMoreElements()) {
final Object element = elements.nextElement();
// xsl:decimal-format
if (element instanceof DecimalFormatting) {
((DecimalFormatting) element).translate(classGen, toplevel);
}
// xsl:strip/preserve-space
else if (element instanceof Whitespace) {
whitespaceRules.addAll(((Whitespace) element).getRules());
}
}
// Translate all whitespace strip/preserve rules
if (whitespaceRules.size() > 0) {
Whitespace.translateRules(whitespaceRules, classGen);
}
if (classGen.containsMethod(STRIP_SPACE, STRIP_SPACE_PARAMS) != null) {
il.append(toplevel.loadDOM());
il.append(classGen.loadTranslet());
il.append(new INVOKEINTERFACE(setFilter, 2));
}
il.append(RETURN);
// Compute max locals + stack and add method to class
classGen.addMethod(toplevel);
return ("(" + DOM_INTF_SIG + NODE_ITERATOR_SIG + TRANSLET_OUTPUT_SIG + ")V");
}
/**
* Compile transform() into the output class. This method is used to initialize global variables
* and global parameters. The current node is set to be the document's root node.
*/
private void compileTransform(ClassGenerator classGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
/*
* Define the the method transform with the following signature:
* void transform(DOM, NodeIterator, HandlerBase)
*/
final com.sun.org.apache.bcel.internal.generic.Type[] argTypes =
new com.sun.org.apache.bcel.internal.generic.Type[3];
argTypes[0] = Util.getJCRefType(DOM_INTF_SIG);
argTypes[1] = Util.getJCRefType(NODE_ITERATOR_SIG);
argTypes[2] = Util.getJCRefType(TRANSLET_OUTPUT_SIG);
final String[] argNames = new String[3];
argNames[0] = DOCUMENT_PNAME;
argNames[1] = ITERATOR_PNAME;
argNames[2] = TRANSLET_OUTPUT_PNAME;
final InstructionList il = new InstructionList();
final MethodGenerator transf =
new MethodGenerator(
ACC_PUBLIC,
com.sun.org.apache.bcel.internal.generic.Type.VOID,
argTypes,
argNames,
"transform",
_className,
il,
classGen.getConstantPool());
transf.addException("com.sun.org.apache.xalan.internal.xsltc.TransletException");
// Define and initialize current with the root node
final LocalVariableGen current =
transf.addLocalVariable(
"current", com.sun.org.apache.bcel.internal.generic.Type.INT, null, null);
final String applyTemplatesSig = classGen.getApplyTemplatesSig();
final int applyTemplates =
cpg.addMethodref(getClassName(), "applyTemplates", applyTemplatesSig);
final int domField = cpg.addFieldref(getClassName(), DOM_FIELD, DOM_INTF_SIG);
// push translet for PUTFIELD
il.append(classGen.loadTranslet());
// prepare appropriate DOM implementation
if (isMultiDocument()) {
il.append(new NEW(cpg.addClass(MULTI_DOM_CLASS)));
il.append(DUP);
}
il.append(classGen.loadTranslet());
il.append(transf.loadDOM());
il.append(
new INVOKEVIRTUAL(
cpg.addMethodref(
TRANSLET_CLASS, "makeDOMAdapter", "(" + DOM_INTF_SIG + ")" + DOM_ADAPTER_SIG)));
// DOMAdapter is on the stack
if (isMultiDocument()) {
final int init = cpg.addMethodref(MULTI_DOM_CLASS, "<init>", "(" + DOM_INTF_SIG + ")V");
il.append(new INVOKESPECIAL(init));
// MultiDOM is on the stack
}
// store to _dom variable
il.append(new PUTFIELD(domField));
// continue with globals initialization
final int gitr = cpg.addInterfaceMethodref(DOM_INTF, "getIterator", "()" + NODE_ITERATOR_SIG);
il.append(transf.loadDOM());
il.append(new INVOKEINTERFACE(gitr, 1));
il.append(transf.nextNode());
current.setStart(il.append(new ISTORE(current.getIndex())));
// Transfer the output settings to the output post-processor
il.append(classGen.loadTranslet());
il.append(transf.loadHandler());
final int index =
cpg.addMethodref(TRANSLET_CLASS, "transferOutputSettings", "(" + OUTPUT_HANDLER_SIG + ")V");
il.append(new INVOKEVIRTUAL(index));
/*
* Compile buildKeys() method. Note that this method is not
* invoked here as keys for the input document are now created
* in topLevel(). However, this method is still needed by the
* LoadDocument class.
*/
final String keySig = compileBuildKeys(classGen);
final int keyIdx = cpg.addMethodref(getClassName(), "buildKeys", keySig);
// Look for top-level elements that need handling
final Enumeration toplevel = elements();
if (_globals.size() > 0 || toplevel.hasMoreElements()) {
// Compile method for handling top-level elements
final String topLevelSig = compileTopLevel(classGen);
// Get a reference to that method
final int topLevelIdx = cpg.addMethodref(getClassName(), "topLevel", topLevelSig);
// Push all parameters on the stack and call topLevel()
il.append(classGen.loadTranslet()); // The 'this' pointer
il.append(classGen.loadTranslet());
il.append(new GETFIELD(domField)); // The DOM reference
il.append(transf.loadIterator());
il.append(transf.loadHandler()); // The output handler
il.append(new INVOKEVIRTUAL(topLevelIdx));
}
// start document
il.append(transf.loadHandler());
il.append(transf.startDocument());
// push first arg for applyTemplates
il.append(classGen.loadTranslet());
// push translet for GETFIELD to get DOM arg
il.append(classGen.loadTranslet());
il.append(new GETFIELD(domField));
// push remaining 2 args
il.append(transf.loadIterator());
il.append(transf.loadHandler());
il.append(new INVOKEVIRTUAL(applyTemplates));
// endDocument
il.append(transf.loadHandler());
il.append(transf.endDocument());
il.append(RETURN);
// Compute max locals + stack and add method to class
classGen.addMethod(transf);
}
