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1 /* |
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2 * reserved comment block |
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3 * DO NOT REMOVE OR ALTER! |
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4 */ |
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5 /* |
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6 * Copyright 2001-2004 The Apache Software Foundation. |
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7 * |
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8 * Licensed under the Apache License, Version 2.0 (the "License"); |
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9 * you may not use this file except in compliance with the License. |
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10 * You may obtain a copy of the License at |
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11 * |
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12 * http://www.apache.org/licenses/LICENSE-2.0 |
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13 * |
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14 * Unless required by applicable law or agreed to in writing, software |
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15 * distributed under the License is distributed on an "AS IS" BASIS, |
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16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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17 * See the License for the specific language governing permissions and |
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18 * limitations under the License. |
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19 */ |
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20 /* |
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21 * $Id: CastCall.java,v 1.2.4.1 2005/09/01 11:47:58 pvedula Exp $ |
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22 */ |
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23 |
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24 package com.sun.org.apache.xalan.internal.xsltc.compiler; |
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25 |
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26 import java.util.Vector; |
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27 |
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28 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; |
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29 import com.sun.org.apache.bcel.internal.generic.CHECKCAST; |
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30 import com.sun.org.apache.bcel.internal.generic.InstructionList; |
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31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
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32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
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33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg; |
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34 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
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35 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ObjectType; |
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36 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
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37 |
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38 /** |
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39 * @author Santiago Pericas-Geertsen |
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40 */ |
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41 final class CastCall extends FunctionCall { |
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42 |
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43 /** |
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44 * Name of the class that is the target of the cast. Must be a |
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45 * fully-qualified Java class Name. |
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46 */ |
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47 private String _className; |
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48 |
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49 /** |
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50 * A reference to the expression being casted. |
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51 */ |
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52 private Expression _right; |
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53 |
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54 /** |
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55 * Constructor. |
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56 */ |
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57 public CastCall(QName fname, Vector arguments) { |
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58 super(fname, arguments); |
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59 } |
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60 |
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61 /** |
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62 * Type check the two parameters for this function |
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63 */ |
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64 public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
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65 // Check that the function was passed exactly two arguments |
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66 if (argumentCount() != 2) { |
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67 throw new TypeCheckError(new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, |
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68 getName(), this)); |
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69 } |
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70 |
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71 // The first argument must be a literal String |
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72 Expression exp = argument(0); |
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73 if (exp instanceof LiteralExpr) { |
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74 _className = ((LiteralExpr) exp).getValue(); |
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75 _type = Type.newObjectType(_className); |
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76 } |
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77 else { |
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78 throw new TypeCheckError(new ErrorMsg(ErrorMsg.NEED_LITERAL_ERR, |
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79 getName(), this)); |
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80 } |
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81 |
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82 // Second argument must be of type reference or object |
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83 _right = argument(1); |
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84 Type tright = _right.typeCheck(stable); |
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85 if (tright != Type.Reference && |
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86 tright instanceof ObjectType == false) |
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87 { |
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88 throw new TypeCheckError(new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR, |
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89 tright, _type, this)); |
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90 } |
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91 |
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92 return _type; |
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93 } |
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94 |
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95 public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
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96 final ConstantPoolGen cpg = classGen.getConstantPool(); |
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97 final InstructionList il = methodGen.getInstructionList(); |
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98 |
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99 _right.translate(classGen, methodGen); |
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100 il.append(new CHECKCAST(cpg.addClass(_className))); |
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101 } |
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102 } |