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 }