- /*
- * 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 1.3 2004/02/16 22:24:29 minchau 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)));
- }
- }