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// $Id: JAXPVariableStack.java,v 1.7 2010-11-01 04:35:16 joehw Exp $

package com.sun.org.apache.xpath.internal.jaxp;

import javax.xml.transform.TransformerException;
import javax.xml.xpath.XPathVariableResolver;

import com.sun.org.apache.xml.internal.utils.QName;
import com.sun.org.apache.xpath.internal.VariableStack;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XObject;

import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
import com.sun.org.apache.xalan.internal.res.XSLMessages;


/**
 * Overrides {@link VariableStack} and delegates the call to
 * {@link javax.xml.xpath.XPathVariableResolver}.
 * 
 * @author Ramesh Mandava ( [email protected] )
 */
public class JAXPVariableStack extends VariableStack {
    	
    private final XPathVariableResolver resolver;
	
    public JAXPVariableStack(XPathVariableResolver resolver) {
        this.resolver = resolver;
    }
	
    public XObject getVariableOrParam(XPathContext xctxt, QName qname)
        throws TransformerException,IllegalArgumentException {
        if ( qname == null ) {
            //JAXP 1.3 spec says that if variable name is null then 
            // we need to through IllegalArgumentException
            String fmsg = XSLMessages.createXPATHMessage( 
                XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,
                new Object[] {"Variable qname"} );
            throw new IllegalArgumentException( fmsg );
        }
	javax.xml.namespace.QName name =
	    new javax.xml.namespace.QName(
                qname.getNamespace(),
                qname.getLocalPart());
        Object varValue = resolver.resolveVariable( name );		
        if ( varValue == null ) {
            String fmsg = XSLMessages.createXPATHMessage( 
                XPATHErrorResources.ER_RESOLVE_VARIABLE_RETURNS_NULL,
                new Object[] { name.toString()} );
            throw new TransformerException( fmsg );
        } 
        return XObject.create( varValue, xctxt );
    }

}