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      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 (at) sun.com )
     39  */
     40 public class JAXPVariableStack extends VariableStack {
     41 
     42     private final XPathVariableResolver resolver;
     43 
     44     public JAXPVariableStack(XPathVariableResolver resolver) {
     45         super(2);
     46         this.resolver = resolver;
     47     }
     48 
     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