/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: AbsolutePathPattern.java 468650 2006-10-28 07:03:30Z minchau $
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.bcel.generic.BranchHandle;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.GOTO_W;
import org.apache.bcel.generic.IF_ICMPEQ;
import org.apache.bcel.generic.ILOAD;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.ISTORE;
import org.apache.bcel.generic.InstructionHandle;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.LocalVariableGen;
import org.apache.bcel.generic.PUSH;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
import org.apache.xalan.xsltc.compiler.util.Util;
import org.apache.xml.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),
null);
il.append(DUP);
local.setStart(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() : ")");
}
}