libcore/luni/src/main/java/org/apache/xpath/jaxp/JAXPVariableStack.java

   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
  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 }