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


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: StringLengthCall.java,v 1.5 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.ConstantPoolGen;
25 import org.apache.bcel.generic.INVOKEVIRTUAL;
26 import org.apache.bcel.generic.InstructionList;
27 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
28 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
29 import org.apache.xalan.xsltc.compiler.util.Type;
30
31 /**
32  * @author Jacek Ambroziak
33  * @author Santiago Pericas-Geertsen
34  */
35 final class StringLengthCall extends FunctionCall {
36     public StringLengthCall(QName fname, Vector JavaDoc arguments) {
37     super(fname, arguments);
38     }
39
40     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
41     final ConstantPoolGen cpg = classGen.getConstantPool();
42     final InstructionList il = methodGen.getInstructionList();
43     if (argumentCount() > 0) {
44         argument().translate(classGen, methodGen);
45     }
46     else {
47         il.append(methodGen.loadContextNode());
48         Type.Node.translateTo(classGen, methodGen, Type.String);
49     }
50     il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
51                              "length", "()I")));
52     }
53 }
54
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