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/*
* $Id: FilteredAbsoluteLocationPath.java,v 1.10 2010-11-01 04:34:16 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.org.apache.bcel.internal.generic.ALOAD;
import com.sun.org.apache.bcel.internal.generic.ASTORE;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
import com.sun.org.apache.bcel.internal.generic.NEW;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
/**
* @author G. Todd Miller
*/
final class FilteredAbsoluteLocationPath extends Expression {
private Expression _path; // may be null
public FilteredAbsoluteLocationPath() {
_path = null;
}
public FilteredAbsoluteLocationPath(Expression path) {
_path = path;
if (path != null) {
_path.setParent(this);
}
}
public void setParser(Parser parser) {
super.setParser(parser);
if (_path != null) {
_path.setParser(parser);
}
}
public Expression getPath() {
return(_path);
}
public String toString() {
return "FilteredAbsoluteLocationPath(" +
(_path != null ? _path.toString() : "null") + ')';
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (_path != null) {
final Type ptype = _path.typeCheck(stable);
if (ptype instanceof NodeType) { // promote to node-set
_path = new CastExpr(_path, Type.NodeSet);
}
}
return _type = Type.NodeSet;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
if (_path != null) {
final int initDFI = cpg.addMethodref(DUP_FILTERED_ITERATOR,
"",
"("
+ NODE_ITERATOR_SIG
+ ")V");
// Backwards branches are prohibited if an uninitialized object is
// on the stack by section 4.9.4 of the JVM Specification, 2nd Ed.
// We don't know whether this code might contain backwards branches,
// so we mustn't create the new object until after we've created
// the suspect arguments to its constructor. Instead we calculate
// the values of the arguments to the constructor first, store them
// in temporary variables, create the object and reload the
// arguments from the temporaries to avoid the problem.
// Compile relative path iterator(s)
LocalVariableGen pathTemp =
methodGen.addLocalVariable("filtered_absolute_location_path_tmp",
Util.getJCRefType(NODE_ITERATOR_SIG),
il.getEnd(), null);
_path.translate(classGen, methodGen);
il.append(new ASTORE(pathTemp.getIndex()));
// Create new Dup Filter Iterator
il.append(new NEW(cpg.addClass(DUP_FILTERED_ITERATOR)));
il.append(DUP);
il.append(new ALOAD(pathTemp.getIndex()));
// Initialize Dup Filter Iterator with iterator from the stack
il.append(new INVOKESPECIAL(initDFI));
}
else {
final int git = cpg.addInterfaceMethodref(DOM_INTF,
"getIterator",
"()"+NODE_ITERATOR_SIG);
il.append(methodGen.loadDOM());
il.append(new INVOKEINTERFACE(git, 1));
}
}
}