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: NameBase.java,v 1.2.4.1 2005/09/02 10:17:31 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.ConstantPoolGen;
29 import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
30 import com.sun.org.apache.bcel.internal.generic.InstructionList;
31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
34 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
35 
36 /**
37  * @author Morten Jorgensen
38  * @author Erwin Bolwidt <ejb@klomp.org>
39  */
40 class NameBase extends FunctionCall {
41 
42     private Expression _param = null;
43     private Type       _paramType = Type.Node;
44 
45     /**
46      * Handles calls with no parameter (current node is implicit parameter).
47      */
NameBase(QName fname)48     public NameBase(QName fname) {
49         super(fname);
50     }
51 
52     /**
53      * Handles calls with one parameter (either node or node-set).
54      */
NameBase(QName fname, Vector arguments)55     public NameBase(QName fname, Vector arguments) {
56         super(fname, arguments);
57         _param = argument(0);
58     }
59 
60 
61     /**
62      * Check that we either have no parameters or one parameter that is
63      * either a node or a node-set.
64      */
typeCheck(SymbolTable stable)65     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
66 
67         // Check the argument type (if any)
68         switch(argumentCount()) {
69         case 0:
70             _paramType = Type.Node;
71             break;
72         case 1:
73             _paramType = _param.typeCheck(stable);
74             break;
75         default:
76             throw new TypeCheckError(this);
77         }
78 
79         // The argument has to be a node, a node-set or a node reference
80         if ((_paramType != Type.NodeSet) &&
81             (_paramType != Type.Node) &&
82             (_paramType != Type.Reference)) {
83             throw new TypeCheckError(this);
84         }
85 
86         return (_type = Type.String);
87     }
88 
getType()89     public Type getType() {
90         return _type;
91     }
92 
93     /**
94      * Translate the code required for getting the node for which the
95      * QName, local-name or namespace URI should be extracted.
96      */
translate(ClassGenerator classGen, MethodGenerator methodGen)97     public void translate(ClassGenerator classGen,
98                           MethodGenerator methodGen) {
99         final ConstantPoolGen cpg = classGen.getConstantPool();
100         final InstructionList il = methodGen.getInstructionList();
101 
102         il.append(methodGen.loadDOM());
103 
104         // Function was called with no parameters
105         if (argumentCount() == 0) {
106             il.append(methodGen.loadContextNode());
107         }
108         // Function was called with node parameter
109         else if (_paramType == Type.Node) {
110             _param.translate(classGen, methodGen);
111         }
112         else if (_paramType == Type.Reference) {
113             _param.translate(classGen, methodGen);
114             il.append(new INVOKESTATIC(cpg.addMethodref
115                                        (BASIS_LIBRARY_CLASS,
116                                         "referenceToNodeSet",
117                                         "("
118                                         + OBJECT_SIG
119                                         + ")"
120                                         + NODE_ITERATOR_SIG)));
121             il.append(methodGen.nextNode());
122         }
123         // Function was called with node-set parameter
124         else {
125             _param.translate(classGen, methodGen);
126             _param.startIterator(classGen, methodGen);
127             il.append(methodGen.nextNode());
128         }
129     }
130 }
131