/*

 * 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: CastCall.java,v 1.2.4.1 2005/09/01 11:47:58 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.CHECKCAST;

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.ErrorMsg;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ObjectType;

import com.sun.org.apache.xalan.internal.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)));

    }

}