com.sun.org.apache.xalan.internal.xsltc.compiler.ProcessingInstructionPattern Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jaxp-ri Show documentation
Show all versions of jaxp-ri Show documentation
Java API for XML Processing Reference Implementation
The newest version!
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* 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: ProcessingInstructionPattern.java,v 1.10 2010-11-01 04:34:17 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;
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.xml.internal.dtm.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));
}
}