code: /*
   * 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.InstructionList;
  import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
  import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
  import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
  import org.apache.xalan.xsltc.compiler.util.Type;
  import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   */
  final class StringCall extends FunctionCall {
      public StringCall(QName fname, Vector arguments) {
  	super(fname, arguments);
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  	final int argc = argumentCount();
  	if (argc > 1) {
  	    ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
  	    throw new TypeCheckError(err);
  	}
  
  	if (argc > 0) {
  	    argument().typeCheck(stable);
  	}
  	return _type = Type.String;
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  	final InstructionList il = methodGen.getInstructionList();
  	Type targ;
  
  	if (argumentCount() == 0) {
  	    il.append(methodGen.loadContextNode());
  	    targ = Type.Node;
  	}
  	else {
  	    final Expression arg = argument();
  	    arg.translate(classGen, methodGen);
  	    arg.startIterator(classGen, methodGen);
  	    targ = arg.getType();
  	}
  
  	if (!targ.identicalTo(Type.String)) {
  	    targ.translateTo(classGen, methodGen, Type.String);
  	}
      }
  }
  