| /* |
| * 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| |
| 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))); |
| } |
| } |