/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* 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: NameBase.java,v 1.2.4.1 2005/09/02 10:17:31 pvedula Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import java.util.Vector;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
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;
/**
* @author Morten Jorgensen
* @author Erwin Bolwidt <ejb@klomp.org>
*/
class NameBase extends FunctionCall {
private Expression _param = null;
private Type _paramType = Type.Node;
/**
* Handles calls with no parameter (current node is implicit parameter).
*/
public NameBase(QName fname) {
super(fname);
}
/**
* Handles calls with one parameter (either node or node-set).
*/
public NameBase(QName fname, Vector arguments) {
super(fname, arguments);
_param = argument(0);
}
/**
* Check that we either have no parameters or one parameter that is
* either a node or a node-set.
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
// Check the argument type (if any)
switch(argumentCount()) {
case 0:
_paramType = Type.Node;
break;
case 1:
_paramType = _param.typeCheck(stable);
break;
default:
throw new TypeCheckError(this);
}
// The argument has to be a node, a node-set or a node reference
if ((_paramType != Type.NodeSet) &&
(_paramType != Type.Node) &&
(_paramType != Type.Reference)) {
throw new TypeCheckError(this);
}
return (_type = Type.String);
}
public Type getType() {
return _type;
}
/**
* Translate the code required for getting the node for which the
* QName, local-name or namespace URI should be extracted.
*/
public void translate(ClassGenerator classGen,
MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(methodGen.loadDOM());
// Function was called with no parameters
if (argumentCount() == 0) {
il.append(methodGen.loadContextNode());
}
// Function was called with node parameter
else if (_paramType == Type.Node) {
_param.translate(classGen, methodGen);
}
else if (_paramType == Type.Reference) {
_param.translate(classGen, methodGen);
il.append(new INVOKESTATIC(cpg.addMethodref
(BASIS_LIBRARY_CLASS,
"referenceToNodeSet",
"("
+ OBJECT_SIG
+ ")"
+ NODE_ITERATOR_SIG)));
il.append(methodGen.nextNode());
}
// Function was called with node-set parameter
else {
_param.translate(classGen, methodGen);
_param.startIterator(classGen, methodGen);
il.append(methodGen.nextNode());
}
}
}