- /*
- * Copyright 2001-2004 The Apache Software Foundation.
- *
- * Licensed 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,v 1.10 2004/02/16 22:24:29 minchau 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() : ")");
- }
- }