com.sun.org.apache.xalan.internal.xsltc.compiler.FilterParentPath 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: FilterParentPath.java,v 1.10 2010-11-01 04:34:16 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.org.apache.bcel.internal.generic.ALOAD;
import com.sun.org.apache.bcel.internal.generic.ASTORE;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
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.NEW;
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.NodeSetType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ReferenceType;
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;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
final class FilterParentPath extends Expression {
private Expression _filterExpr;
private Expression _path;
private boolean _hasDescendantAxis = false;
public FilterParentPath(Expression filterExpr, Expression path) {
(_path = path).setParent(this);
(_filterExpr = filterExpr).setParent(this);
}
public void setParser(Parser parser) {
super.setParser(parser);
_filterExpr.setParser(parser);
_path.setParser(parser);
}
public String toString() {
return "FilterParentPath(" + _filterExpr + ", " + _path + ')';
}
public void setDescendantAxis() {
_hasDescendantAxis = true;
}
/**
* Type check a FilterParentPath. If the filter is not a node-set add a
* cast to node-set only if it is of reference type. This type coercion is
* needed for expressions like $x/LINE where $x is a parameter reference.
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
final Type ftype = _filterExpr.typeCheck(stable);
if (ftype instanceof NodeSetType == false) {
if (ftype instanceof ReferenceType) {
_filterExpr = new CastExpr(_filterExpr, Type.NodeSet);
}
/*
else if (ftype instanceof ResultTreeType) {
_filterExpr = new CastExpr(_filterExpr, Type.NodeSet);
}
*/
else if (ftype instanceof NodeType) {
_filterExpr = new CastExpr(_filterExpr, Type.NodeSet);
}
else {
throw new TypeCheckError(this);
}
}
// Wrap single node path in a node set
final Type ptype = _path.typeCheck(stable);
if (!(ptype instanceof NodeSetType)) {
_path = new CastExpr(_path, Type.NodeSet);
}
return _type = Type.NodeSet;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Create new StepIterator
final int initSI = cpg.addMethodref(STEP_ITERATOR_CLASS,
"",
"("
+NODE_ITERATOR_SIG
+NODE_ITERATOR_SIG
+")V");
// Backwards branches are prohibited if an uninitialized object is
// on the stack by section 4.9.4 of the JVM Specification, 2nd Ed.
// We don't know whether this code might contain backwards branches,
// so we mustn't create the new object until after we've created
// the suspect arguments to its constructor. Instead we calculate
// the values of the arguments to the constructor first, store them
// in temporary variables, create the object and reload the
// arguments from the temporaries to avoid the problem.
// Recursively compile 2 iterators
_filterExpr.translate(classGen, methodGen);
LocalVariableGen filterTemp =
methodGen.addLocalVariable("filter_parent_path_tmp1",
Util.getJCRefType(NODE_ITERATOR_SIG),
il.getEnd(), null);
il.append(new ASTORE(filterTemp.getIndex()));
_path.translate(classGen, methodGen);
LocalVariableGen pathTemp =
methodGen.addLocalVariable("filter_parent_path_tmp2",
Util.getJCRefType(NODE_ITERATOR_SIG),
il.getEnd(), null);
il.append(new ASTORE(pathTemp.getIndex()));
il.append(new NEW(cpg.addClass(STEP_ITERATOR_CLASS)));
il.append(DUP);
il.append(new ALOAD(filterTemp.getIndex()));
il.append(new ALOAD(pathTemp.getIndex()));
// Initialize StepIterator with iterators from the stack
il.append(new INVOKESPECIAL(initSI));
// This is a special case for the //* path with or without predicates
if (_hasDescendantAxis) {
final int incl = cpg.addMethodref(NODE_ITERATOR_BASE,
"includeSelf",
"()" + NODE_ITERATOR_SIG);
il.append(new INVOKEVIRTUAL(incl));
}
if (!(getParent() instanceof RelativeLocationPath) &&
!(getParent() instanceof FilterParentPath)) {
final int order = cpg.addInterfaceMethodref(DOM_INTF,
ORDER_ITERATOR,
ORDER_ITERATOR_SIG);
il.append(methodGen.loadDOM());
il.append(SWAP);
il.append(methodGen.loadContextNode());
il.append(new INVOKEINTERFACE(order, 3));
}
}
}