| /* |
| * 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import org.apache.bcel.generic.BranchHandle; |
| import org.apache.bcel.generic.ConstantPoolGen; |
| import org.apache.bcel.generic.GOTO; |
| import org.apache.bcel.generic.IFEQ; |
| import org.apache.bcel.generic.IF_ICMPEQ; |
| import org.apache.bcel.generic.INVOKEINTERFACE; |
| import org.apache.bcel.generic.INVOKEVIRTUAL; |
| import org.apache.bcel.generic.InstructionHandle; |
| import org.apache.bcel.generic.InstructionList; |
| 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.xml.dtm.Axis; |
| import org.apache.xml.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)); |
| } |
| } |