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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: StringCall.java,v 1.2.4.1 2005/09/05 09:08:15 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.InstructionList;
29  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
30  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
31  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
32  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
33  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
34  
35  /**
36   * @author Jacek Ambroziak
37   * @author Santiago Pericas-Geertsen
38   */
39  final class StringCall extends FunctionCall {
40      public StringCall(QName fname, Vector arguments) {
41          super(fname, arguments);
42      }
43  
44      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
45          final int argc = argumentCount();
46          if (argc > 1) {
47              ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
48              throw new TypeCheckError(err);
49          }
50  
51          if (argc > 0) {
52              argument().typeCheck(stable);
53          }
54          return _type = Type.String;
55      }
56  
57      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
58          final InstructionList il = methodGen.getInstructionList();
59          Type targ;
60  
61          if (argumentCount() == 0) {
62              il.append(methodGen.loadContextNode());
63              targ = Type.Node;
64          }
65          else {
66              final Expression arg = argument();
67              arg.translate(classGen, methodGen);
68              arg.startIterator(classGen, methodGen);
69              targ = arg.getType();
70          }
71  
72          if (!targ.identicalTo(Type.String)) {
73              targ.translateTo(classGen, methodGen, Type.String);
74          }
75      }
76  }