/*
* 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: CallTemplate.java,v 1.18 2004/02/24 02:57:28 zongaro 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.INVOKEVIRTUAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
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.compiler.util.Util;
import com.sun.org.apache.xml.internal.utils.XMLChar;
import java.util.Vector;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Erwin Bolwidt <ejb@klomp.org>
*/
final class CallTemplate extends Instruction {
/**
* Name of template to call.
*/
private QName _name;
/**
* The array of effective parameters in this CallTemplate. An object in
* this array can be either a WithParam or a Param if no WithParam
* exists for a particular parameter.
*/
private Object[] _parameters = null;
/**
* The corresponding template which this CallTemplate calls.
*/
private Template _calleeTemplate = null;
public void display(int indent) {
indent(indent);
System.out.print("CallTemplate");
Util.println(" name " + _name);
displayContents(indent + IndentIncrement);
}
public boolean hasWithParams() {
return elementCount() > 0;
}
public void parseContents(Parser parser) {
final String name = getAttribute("name");
if (name.length() > 0) {
if (!XMLChar.isValidQName(name)) {
ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, name, this);
parser.reportError(Constants.ERROR, err);
}
_name = parser.getQNameIgnoreDefaultNs(name);
}
else {
reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "name");
}
parseChildren(parser);
}
/**
* Verify that a template with this name exists.
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
final Template template = stable.lookupTemplate(_name);
if (template != null) {
typeCheckContents(stable);
}
else {
ErrorMsg err = new ErrorMsg(ErrorMsg.TEMPLATE_UNDEF_ERR,_name,this);
throw new TypeCheckError(err);
}
return Type.Void;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final Stylesheet stylesheet = classGen.getStylesheet();
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// If there are Params in the stylesheet or WithParams in this call?
if (stylesheet.hasLocalParams() || hasContents()) {
_calleeTemplate = getCalleeTemplate();
// Build the parameter list if the called template is simple named
if (_calleeTemplate != null) {
buildParameterList();
}
// This is only needed when the called template is not
// a simple named template.
else {
// Push parameter frame
final int push = cpg.addMethodref(TRANSLET_CLASS,
PUSH_PARAM_FRAME,
PUSH_PARAM_FRAME_SIG);
il.append(classGen.loadTranslet());
il.append(new INVOKEVIRTUAL(push));
translateContents(classGen, methodGen);
}
}
// Generate a valid Java method name
final String className = stylesheet.getClassName();
String methodName = Util.escape(_name.toString());
// Load standard arguments
il.append(classGen.loadTranslet());
il.append(methodGen.loadDOM());
il.append(methodGen.loadIterator());
il.append(methodGen.loadHandler());
il.append(methodGen.loadCurrentNode());
// Initialize prefix of method signature
StringBuffer methodSig = new StringBuffer("(" + DOM_INTF_SIG
+ NODE_ITERATOR_SIG + TRANSLET_OUTPUT_SIG + NODE_SIG);
// If calling a simply named template, push actual arguments
if (_calleeTemplate != null) {
Vector calleeParams = _calleeTemplate.getParameters();
int numParams = _parameters.length;
for (int i = 0; i < numParams; i++) {
SyntaxTreeNode node = (SyntaxTreeNode)_parameters[i];
methodSig.append(OBJECT_SIG); // append Object to signature
// Push 'null' if Param to indicate no actual parameter specified
if (node instanceof Param) {
il.append(ACONST_NULL);
}
else { // translate WithParam
node.translate(classGen, methodGen);
}
}
}
// Complete signature and generate invokevirtual call
methodSig.append(")V");
il.append(new INVOKEVIRTUAL(cpg.addMethodref(className,
methodName,
methodSig.toString())));
// Do not need to call Translet.popParamFrame() if we are
// calling a simple named template.
if (_calleeTemplate == null && (stylesheet.hasLocalParams() || hasContents())) {
// Pop parameter frame
final int pop = cpg.addMethodref(TRANSLET_CLASS,
POP_PARAM_FRAME,
POP_PARAM_FRAME_SIG);
il.append(classGen.loadTranslet());
il.append(new INVOKEVIRTUAL(pop));
}
}
/**
* Return the simple named template which this CallTemplate calls.
* Return false if there is no matched template or the matched
* template is not a simple named template.
*/
public Template getCalleeTemplate() {
Stylesheet stylesheet = getXSLTC().getStylesheet();
Vector templates = stylesheet.getAllValidTemplates();
int size = templates.size();
for (int i = 0; i < size; i++) {
Template t = (Template)templates.elementAt(i);
if (t.getName() == _name && t.isSimpleNamedTemplate()) {
return t;
}
}
return null;
}
/**
* Build the list of effective parameters in this CallTemplate.
* The parameters of the called template are put into the array first.
* Then we visit the WithParam children of this CallTemplate and replace
* the Param with a corresponding WithParam having the same name.
*/
private void buildParameterList() {
// Put the parameters from the called template into the array first.
// This is to ensure the order of the parameters.
Vector defaultParams = _calleeTemplate.getParameters();
int numParams = defaultParams.size();
_parameters = new Object[numParams];
for (int i = 0; i < numParams; i++) {
_parameters[i] = defaultParams.elementAt(i);
}
// Replace a Param with a WithParam if they have the same name.
int count = elementCount();
for (int i = 0; i < count; i++) {
Object node = elementAt(i);
// Ignore if not WithParam
if (node instanceof WithParam) {
WithParam withParam = (WithParam)node;
QName name = withParam.getName();
// Search for a Param with the same name
for (int k = 0; k < numParams; k++) {
Object object = _parameters[k];
if (object instanceof Param
&& ((Param)object).getName() == name) {
withParam.setDoParameterOptimization(true);
_parameters[k] = withParam;
break;
}
else if (object instanceof WithParam
&& ((WithParam)object).getName() == name) {
withParam.setDoParameterOptimization(true);
_parameters[k] = withParam;
break;
}
}
}
}
}
}
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