1 /*

     2  * reserved comment block

     3  * DO NOT REMOVE OR ALTER!

     4  */

     5 /*

     6  * Copyright 2001-2004 The Apache Software Foundation.

     7  *

     8  * Licensed under the Apache License, Version 2.0 (the "License");

     9  * you may not use this file except in compliance with the License.

    10  * You may obtain a copy of the License at

    11  *

    12  *     http://www.apache.org/licenses/LICENSE-2.0

    13  *

    14  * Unless required by applicable law or agreed to in writing, software

    15  * distributed under the License is distributed on an "AS IS" BASIS,

    16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    17  * See the License for the specific language governing permissions and

    18  * limitations under the License.

    19  */

    20 /*

    21  * $Id: CastCall.java,v 1.2.4.1 2005/09/01 11:47:58 pvedula Exp $

    22  */

    23 

    24 package com.sun.org.apache.xalan.internal.xsltc.compiler;

    25 

    26 import java.util.Vector;

    27 

    28 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;

    29 import com.sun.org.apache.bcel.internal.generic.CHECKCAST;

    30 import com.sun.org.apache.bcel.internal.generic.InstructionList;

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

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

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

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

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

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

    37 

    38 /**

    39  * @author Santiago Pericas-Geertsen

    40  */

    41 final class CastCall extends FunctionCall {

    42 

    43     /**

    44      * Name of the class that is the target of the cast. Must be a

    45      * fully-qualified Java class Name.

    46      */

    47     private String _className;

    48 

    49     /**

    50      * A reference to the expression being casted.

    51      */

    52     private Expression _right;

    53 

    54     /**

    55      * Constructor.

    56      */

    57     public CastCall(QName fname, Vector arguments) {

    58         super(fname, arguments);

    59     }

    60 

    61     /**

    62      * Type check the two parameters for this function

    63      */

    64     public Type typeCheck(SymbolTable stable) throws TypeCheckError {

    65         // Check that the function was passed exactly two arguments

    66         if (argumentCount() != 2) {

    67             throw new TypeCheckError(new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR,

    68                                                   getName(), this));

    69         }

    70 

    71         // The first argument must be a literal String

    72         Expression exp = argument(0);

    73         if (exp instanceof LiteralExpr) {

    74             _className = ((LiteralExpr) exp).getValue();

    75             _type = Type.newObjectType(_className);

    76         }

    77         else {

    78             throw new TypeCheckError(new ErrorMsg(ErrorMsg.NEED_LITERAL_ERR,

    79                                                   getName(), this));

    80         }

    81 

    82          // Second argument must be of type reference or object

    83         _right = argument(1);

    84         Type tright = _right.typeCheck(stable);

    85         if (tright != Type.Reference &&

    86             tright instanceof ObjectType == false)

    87         {

    88             throw new TypeCheckError(new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,

    89                                                   tright, _type, this));

    90         }

    91 

    92         return _type;

    93     }

    94 

    95     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

    96         final ConstantPoolGen cpg = classGen.getConstantPool();

    97         final InstructionList il = methodGen.getInstructionList();

    98 

    99         _right.translate(classGen, methodGen);

   100         il.append(new CHECKCAST(cpg.addClass(_className)));

   101     }

   102 }