/*
* 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: ApplyTemplates.java,v 1.22 2005/03/23 17:54:04 ytalwar Exp $
*/
package org.apache.xalan.xsltc.compiler;
import java.util.Enumeration;
import java.util.Vector;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.InstructionList;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.NodeSetType;
import org.apache.xalan.xsltc.compiler.util.NodeType;
import org.apache.xalan.xsltc.compiler.util.ReferenceType;
import org.apache.xalan.xsltc.compiler.util.ResultTreeType;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
import org.apache.xalan.xsltc.compiler.util.Util;
import org.apache.xml.utils.XML11Char;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
final class ApplyTemplates extends Instruction {
private Expression _select;
private Type _type = null;
private QName _modeName;
private String _functionName;
public void display(int indent) {
indent(indent);
Util.println("ApplyTemplates");
indent(indent + IndentIncrement);
Util.println("select " + _select.toString());
if (_modeName != null) {
indent(indent + IndentIncrement);
Util.println("mode " + _modeName);
}
}
public boolean hasWithParams() {
return hasContents();
}
public void parseContents(Parser parser) {
final String select = getAttribute("select");
final String mode = getAttribute("mode");
if (select.length() > 0) {
_select = parser.parseExpression(this, "select", null);
}
if (mode.length() > 0) {
if (!XML11Char.isXML11ValidQName(mode)) {
ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, mode, this);
parser.reportError(Constants.ERROR, err);
}
_modeName = parser.getQNameIgnoreDefaultNs(mode);
}
// instantiate Mode if needed, cache (apply temp) function name
_functionName =
parser.getTopLevelStylesheet().getMode(_modeName).functionName();
parseChildren(parser);// with-params
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (_select != null) {
_type = _select.typeCheck(stable);
if (_type instanceof NodeType || _type instanceof ReferenceType) {
_select = new CastExpr(_select, Type.NodeSet);
_type = Type.NodeSet;
}
if (_type instanceof NodeSetType||_type instanceof ResultTreeType) {
typeCheckContents(stable); // with-params
return Type.Void;
}
throw new TypeCheckError(this);
}
else {
typeCheckContents(stable); // with-params
return Type.Void;
}
}
/**
* Translate call-template. A parameter frame is pushed only if
* some template in the stylesheet uses parameters.
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
boolean setStartNodeCalled = false;
final Stylesheet stylesheet = classGen.getStylesheet();
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final int current = methodGen.getLocalIndex("current");
// check if sorting nodes is required
final Vector sortObjects = new Vector();
final Enumeration children = elements();
while (children.hasMoreElements()) {
final Object child = children.nextElement();
if (child instanceof Sort) {
sortObjects.addElement(child);
}
}
// Push a new parameter frame
if (stylesheet.hasLocalParams() || hasContents()) {
il.append(classGen.loadTranslet());
final int pushFrame = cpg.addMethodref(TRANSLET_CLASS,
PUSH_PARAM_FRAME,
PUSH_PARAM_FRAME_SIG);
il.append(new INVOKEVIRTUAL(pushFrame));
// translate with-params
translateContents(classGen, methodGen);
}
il.append(classGen.loadTranslet());
// The 'select' expression is a result-tree
if ((_type != null) && (_type instanceof ResultTreeType)) {
// <xsl:sort> cannot be applied to a result tree - issue warning
if (sortObjects.size() > 0) {
ErrorMsg err = new ErrorMsg(ErrorMsg.RESULT_TREE_SORT_ERR,this);
getParser().reportError(WARNING, err);
}
// Put the result tree (a DOM adapter) on the stack
_select.translate(classGen, methodGen);
// Get back the DOM and iterator (not just iterator!!!)
_type.translateTo(classGen, methodGen, Type.NodeSet);
}
else {
il.append(methodGen.loadDOM());
// compute node iterator for applyTemplates
if (sortObjects.size() > 0) {
Sort.translateSortIterator(classGen, methodGen,
_select, sortObjects);
int setStartNode = cpg.addInterfaceMethodref(NODE_ITERATOR,
SET_START_NODE,
"(I)"+
NODE_ITERATOR_SIG);
il.append(methodGen.loadCurrentNode());
il.append(new INVOKEINTERFACE(setStartNode,2));
setStartNodeCalled = true;
}
else {
if (_select == null)
Mode.compileGetChildren(classGen, methodGen, current);
else
_select.translate(classGen, methodGen);
}
}
if (_select != null && !setStartNodeCalled) {
_select.startIterator(classGen, methodGen);
}
//!!! need to instantiate all needed modes
final String className = classGen.getStylesheet().getClassName();
il.append(methodGen.loadHandler());
final String applyTemplatesSig = classGen.getApplyTemplatesSig();
final int applyTemplates = cpg.addMethodref(className,
_functionName,
applyTemplatesSig);
il.append(new INVOKEVIRTUAL(applyTemplates));
// Pop parameter frame
if (stylesheet.hasLocalParams() || hasContents()) {
il.append(classGen.loadTranslet());
final int popFrame = cpg.addMethodref(TRANSLET_CLASS,
POP_PARAM_FRAME,
POP_PARAM_FRAME_SIG);
il.append(new INVOKEVIRTUAL(popFrame));
}
}
}