1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements. See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership. The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the  "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  *     http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 // $Id: JAXPVariableStack.java 524815 2007-04-02 15:52:15Z zongaro $
19 
20 package org.apache.xpath.jaxp;
21 
22 import javax.xml.transform.TransformerException;
23 import javax.xml.xpath.XPathVariableResolver;
24 
25 import org.apache.xml.utils.QName;
26 import org.apache.xpath.VariableStack;
27 import org.apache.xpath.XPathContext;
28 import org.apache.xpath.objects.XObject;
29 
30 import org.apache.xpath.res.XPATHErrorResources;
31 import org.apache.xalan.res.XSLMessages;
32 
33 
34 /**
35  * Overrides {@link VariableStack} and delegates the call to
36  * {@link javax.xml.xpath.XPathVariableResolver}.
37  *
38  * @author Ramesh Mandava ( ramesh.mandava@sun.com )
39  */
40 public class JAXPVariableStack extends VariableStack {
41 
42     private final XPathVariableResolver resolver;
43 
JAXPVariableStack(XPathVariableResolver resolver)44     public JAXPVariableStack(XPathVariableResolver resolver) {
45         super(2);
46         this.resolver = resolver;
47     }
48 
getVariableOrParam(XPathContext xctxt, QName qname)49     public XObject getVariableOrParam(XPathContext xctxt, QName qname)
50         throws TransformerException,IllegalArgumentException {
51         if ( qname == null ) {
52             //JAXP 1.3 spec says that if variable name is null then
53             // we need to through IllegalArgumentException
54             String fmsg = XSLMessages.createXPATHMessage(
55                 XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,
56                 new Object[] {"Variable qname"} );
57             throw new IllegalArgumentException( fmsg );
58         }
59 	javax.xml.namespace.QName name =
60 	    new javax.xml.namespace.QName(
61                 qname.getNamespace(),
62                 qname.getLocalPart());
63         Object varValue = resolver.resolveVariable( name );
64         if ( varValue == null ) {
65             String fmsg = XSLMessages.createXPATHMessage(
66                 XPATHErrorResources.ER_RESOLVE_VARIABLE_RETURNS_NULL,
67                 new Object[] { name.toString()} );
68             throw new TransformerException( fmsg );
69         }
70         return XObject.create( varValue, xctxt );
71     }
72 
73 }
74