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


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: NamespaceUriCall.java,v 1.6 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.INVOKEINTERFACE;
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
30 /**
31  * @author Morten Jorgensen
32  */
33 final class NamespaceUriCall extends NameBase {
34
35     /**
36      * Handles calls with no parameter (current node is implicit parameter).
37      */
38     public NamespaceUriCall(QName fname) {
39     super(fname);
40     }
41
42     /**
43      * Handles calls with one parameter (either node or node-set).
44      */
45     public NamespaceUriCall(QName fname, Vector JavaDoc arguments) {
46     super(fname, arguments);
47     }
48
49     /**
50      * Translate code that leaves a node's namespace URI (as a String)
51      * on the stack
52      */
53     public void translate(ClassGenerator classGen,
54               MethodGenerator methodGen) {
55     final ConstantPoolGen cpg = classGen.getConstantPool();
56     final InstructionList il = methodGen.getInstructionList();
57
58     // Returns the string value for a node in the DOM
59 final int getNamespace = cpg.addInterfaceMethodref(DOM_INTF,
60                                "getNamespaceName",
61                                "(I)"+STRING_SIG);
62     super.translate(classGen, methodGen);
63     il.append(new INVOKEINTERFACE(getNamespace, 2));
64     }
65 }
66
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