- /*
- * 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: ProcessingInstructionPattern.java,v 1.7 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;
- import com.sun.org.apache.bcel.internal.generic.IFEQ;
- import com.sun.org.apache.bcel.internal.generic.IF_ICMPEQ;
- import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
- import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
- 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.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.dom.Axis;
- import com.sun.org.apache.xml.internal.dtm.DTM;
-
- /**
- * @author Morten Jorgensen
- */
- final class ProcessingInstructionPattern extends StepPattern {
-
- private String _name = null;
- private boolean _typeChecked = false;
-
- /**
- * Handles calls with no parameter (current node is implicit parameter).
- */
- public ProcessingInstructionPattern(String name) {
- super(Axis.CHILD, DTM.PROCESSING_INSTRUCTION_NODE, null);
- _name = name;
- //if (_name.equals("*")) _typeChecked = true; no wildcard allowed!
- }
-
- /**
- *
- */
- public double getDefaultPriority() {
- return (_name != null) ? 0.0 : -0.5;
- }
- public String toString() {
- if (_predicates == null)
- return "processing-instruction("+_name+")";
- else
- return "processing-instruction("+_name+")"+_predicates;
- }
-
- public void reduceKernelPattern() {
- _typeChecked = true;
- }
-
- public boolean isWildcard() {
- return false;
- }
-
- public Type typeCheck(SymbolTable stable) throws TypeCheckError {
- if (hasPredicates()) {
- // Type check all the predicates (e -> position() = e)
- final int n = _predicates.size();
- for (int i = 0; i < n; i++) {
- final Predicate pred = (Predicate)_predicates.elementAt(i);
- pred.typeCheck(stable);
- }
- }
- return Type.NodeSet;
- }
-
- public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
- final ConstantPoolGen cpg = classGen.getConstantPool();
- final InstructionList il = methodGen.getInstructionList();
-
- // context node is on the stack
- int gname = cpg.addInterfaceMethodref(DOM_INTF,
- "getNodeName",
- "(I)Ljava/lang/String;");
- int cmp = cpg.addMethodref(STRING_CLASS,
- "equals", "(Ljava/lang/Object;)Z");
-
- // Push current node on the stack
- il.append(methodGen.loadCurrentNode());
- il.append(SWAP);
-
- // Overwrite current node with matching node
- il.append(methodGen.storeCurrentNode());
-
- // If pattern not reduced then check kernel
- if (!_typeChecked) {
- il.append(methodGen.loadCurrentNode());
- final int getType = cpg.addInterfaceMethodref(DOM_INTF,
- "getExpandedTypeID",
- "(I)I");
- il.append(methodGen.loadDOM());
- il.append(methodGen.loadCurrentNode());
- il.append(new INVOKEINTERFACE(getType, 2));
- il.append(new PUSH(cpg, DTM.PROCESSING_INSTRUCTION_NODE));
- _falseList.add(il.append(new IF_ICMPEQ(null)));
- }
-
- // Load the requested processing instruction name
- il.append(new PUSH(cpg, _name));
- // Load the current processing instruction's name
- il.append(methodGen.loadDOM());
- il.append(methodGen.loadCurrentNode());
- il.append(new INVOKEINTERFACE(gname, 2));
- // Compare the two strings
- il.append(new INVOKEVIRTUAL(cmp));
- _falseList.add(il.append(new IFEQ(null)));
-
- // Compile the expressions within the predicates
- if (hasPredicates()) {
- final int n = _predicates.size();
- for (int i = 0; i < n; i++) {
- Predicate pred = (Predicate)_predicates.elementAt(i);
- Expression exp = pred.getExpr();
- exp.translateDesynthesized(classGen, methodGen);
- _trueList.append(exp._trueList);
- _falseList.append(exp._falseList);
- }
- }
-
- // Backpatch true list and restore current iterator/node
- InstructionHandle restore;
- restore = il.append(methodGen.storeCurrentNode());
- backPatchTrueList(restore);
- BranchHandle skipFalse = il.append(new GOTO(null));
-
- // Backpatch false list and restore current iterator/node
- restore = il.append(methodGen.storeCurrentNode());
- backPatchFalseList(restore);
- _falseList.add(il.append(new GOTO(null)));
-
- // True list falls through
- skipFalse.setTarget(il.append(NOP));
- }
- }