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/*
* $Id: AbsolutePathPattern.java,v 1.10 2010-11-01 04:34:15 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.org.apache.bcel.internal.generic.BranchHandle;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.GOTO_W;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPEQ;
import com.sun.org.apache.bcel.internal.generic.ILOAD;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.ISTORE;
import com.sun.org.apache.bcel.internal.generic.InstructionHandle;
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.PUSH;
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.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
import com.sun.org.apache.xml.internal.dtm.DTM;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
final class AbsolutePathPattern extends LocationPathPattern {
private final RelativePathPattern _left; // may be null
public AbsolutePathPattern(RelativePathPattern left) {
_left = left;
if (left != null) {
left.setParent(this);
}
}
public void setParser(Parser parser) {
super.setParser(parser);
if (_left != null)
_left.setParser(parser);
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
return _left == null ? Type.Root : _left.typeCheck(stable);
}
public boolean isWildcard() {
return false;
}
public StepPattern getKernelPattern() {
return _left != null ? _left.getKernelPattern() : null;
}
public void reduceKernelPattern() {
_left.reduceKernelPattern();
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
if (_left != null) {
if (_left instanceof StepPattern) {
final LocalVariableGen local =
// absolute path pattern temporary
methodGen.addLocalVariable2("apptmp",
Util.getJCRefType(NODE_SIG),
il.getEnd());
il.append(DUP);
il.append(new ISTORE(local.getIndex()));
_left.translate(classGen, methodGen);
il.append(methodGen.loadDOM());
local.setEnd(il.append(new ILOAD(local.getIndex())));
methodGen.removeLocalVariable(local);
}
else {
_left.translate(classGen, methodGen);
}
}
final int getParent = cpg.addInterfaceMethodref(DOM_INTF,
GET_PARENT,
GET_PARENT_SIG);
final int getType = cpg.addInterfaceMethodref(DOM_INTF,
"getExpandedTypeID",
"(I)I");
InstructionHandle begin = il.append(methodGen.loadDOM());
il.append(SWAP);
il.append(new INVOKEINTERFACE(getParent, 2));
if (_left instanceof AncestorPattern) {
il.append(methodGen.loadDOM());
il.append(SWAP);
}
il.append(new INVOKEINTERFACE(getType, 2));
il.append(new PUSH(cpg, DTM.DOCUMENT_NODE));
final BranchHandle skip = il.append(new IF_ICMPEQ(null));
_falseList.add(il.append(new GOTO_W(null)));
skip.setTarget(il.append(NOP));
if (_left != null) {
_left.backPatchTrueList(begin);
/*
* If _left is an ancestor pattern, backpatch this pattern's false
* list to the loop that searches for more ancestors.
*/
if (_left instanceof AncestorPattern) {
final AncestorPattern ancestor = (AncestorPattern) _left;
_falseList.backPatch(ancestor.getLoopHandle()); // clears list
}
_falseList.append(_left._falseList);
}
}
public String toString() {
return "absolutePathPattern(" + (_left != null ? _left.toString() : ")");
}
}