/*
* 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: CastCall.java 468650 2006-10-28 07:03:30Z minchau $
*/
package org.apache.xalan.xsltc.compiler;
import java.util.Vector;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.CHECKCAST;
import org.apache.bcel.generic.InstructionList;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.ObjectType;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
/**
* @author Santiago Pericas-Geertsen
*/
final class CastCall extends FunctionCall {
/**
* Name of the class that is the target of the cast. Must be a
* fully-qualified Java class Name.
*/
private String _className;
/**
* A reference to the expression being casted.
*/
private Expression _right;
/**
* Constructor.
*/
public CastCall(QName fname, Vector arguments) {
super(fname, arguments);
}
/**
* Type check the two parameters for this function
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
// Check that the function was passed exactly two arguments
if (argumentCount() != 2) {
throw new TypeCheckError(new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR,
getName(), this));
}
// The first argument must be a literal String
Expression exp = argument(0);
if (exp instanceof LiteralExpr) {
_className = ((LiteralExpr) exp).getValue();
_type = Type.newObjectType(_className);
}
else {
throw new TypeCheckError(new ErrorMsg(ErrorMsg.NEED_LITERAL_ERR,
getName(), this));
}
// Second argument must be of type reference or object
_right = argument(1);
Type tright = _right.typeCheck(stable);
if (tright != Type.Reference &&
tright instanceof ObjectType == false)
{
throw new TypeCheckError(new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
tright, _type, this));
}
return _type;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
_right.translate(classGen, methodGen);
il.append(new CHECKCAST(cpg.addClass(_className)));
}
}