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Java > Open Source Codes > org > apache > xalan > xsltc > compiler > StringCall


1 /*
2  * Copyright 2001-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17  * $Id: StringCall.java,v 1.7 2004/02/16 22:24:29 minchau Exp $
18  */
19
20 package org.apache.xalan.xsltc.compiler;
21
22 import java.util.Vector JavaDoc;
23
24 import org.apache.bcel.generic.InstructionList;
25 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
26 import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
27 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
28 import org.apache.xalan.xsltc.compiler.util.Type;
29 import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
30
31 /**
32  * @author Jacek Ambroziak
33  * @author Santiago Pericas-Geertsen
34  */
35 final class StringCall extends FunctionCall {
36     public StringCall(QName fname, Vector JavaDoc arguments) {
37     super(fname, arguments);
38     }
39
40     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
41     final int argc = argumentCount();
42     if (argc > 1) {
43         ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
44         throw new TypeCheckError(err);
45     }
46
47     if (argc > 0) {
48         argument().typeCheck(stable);
49     }
50     return _type = Type.String;
51     }
52
53     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
54     final InstructionList il = methodGen.getInstructionList();
55     Type targ;
56
57     if (argumentCount() == 0) {
58         il.append(methodGen.loadContextNode());
59         targ = Type.Node;
60     }
61     else {
62         final Expression arg = argument();
63         arg.translate(classGen, methodGen);
64         arg.startIterator(classGen, methodGen);
65         targ = arg.getType();
66     }
67
68     if (!targ.identicalTo(Type.String)) {
69         targ.translateTo(classGen, methodGen, Type.String);
70     }
71     }
72 }
73
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