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


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: PositionCall.java,v 1.14 2004/02/16 22:24:29 minchau Exp $
18  */
19
20 package org.apache.xalan.xsltc.compiler;
21
22 import org.apache.bcel.generic.ConstantPoolGen;
23 import org.apache.bcel.generic.ILOAD;
24 import org.apache.bcel.generic.INVOKEINTERFACE;
25 import org.apache.bcel.generic.InstructionList;
26 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
27 import org.apache.xalan.xsltc.compiler.util.CompareGenerator;
28 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
29 import org.apache.xalan.xsltc.compiler.util.TestGenerator;
30
31 /**
32  * @author Jacek Ambroziak
33  * @author Santiago Pericas-Geertsen
34  * @author Morten Jorgensen
35  */
36 final class PositionCall extends FunctionCall {
37
38     public PositionCall(QName fname) {
39     super(fname);
40     }
41
42     public boolean hasPositionCall() {
43     return true;
44     }
45
46     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
47     final InstructionList il = methodGen.getInstructionList();
48
49     if (methodGen instanceof CompareGenerator) {
50         il.append(((CompareGenerator)methodGen).loadCurrentNode());
51     }
52     else if (methodGen instanceof TestGenerator) {
53         il.append(new ILOAD(POSITION_INDEX));
54     }
55     else {
56         final ConstantPoolGen cpg = classGen.getConstantPool();
57             final int index = cpg.addInterfaceMethodref(NODE_ITERATOR,
58                                                        "getPosition",
59                                                        "()I");
60
61         il.append(methodGen.loadIterator());
62             il.append(new INVOKEINTERFACE(index,1));
63     }
64     }
65 }
66
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