/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-09 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.xquery.functions.session;
//import org.apache.log4j.Logger;
import org.exist.dom.QName;
import org.exist.http.servlets.SessionWrapper;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.Variable;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.JavaObjectValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
/**
* @author wolf
*/
public class Invalidate extends BasicFunction {
// private static final Logger logger = Logger.getLogger(Invalidate.class);
public final static FunctionSignature signature =
new FunctionSignature(
new QName("invalidate", SessionModule.NAMESPACE_URI, SessionModule.PREFIX),
"Invalidate (remove) the current HTTP session if present",
null,
new SequenceType(Type.ITEM, Cardinality.EMPTY));
/**
* @param context
*/
public Invalidate(XQueryContext context) {
super(context, signature);
}
/* (non-Javadoc)
* @see org.exist.xquery.BasicFunction#eval(org.exist.xquery.value.Sequence[], org.exist.xquery.value.Sequence)
*/
public Sequence eval(Sequence[] args, Sequence contextSequence)
throws XPathException {
final SessionModule myModule = (SessionModule)context.getModule(SessionModule.NAMESPACE_URI);
// session object is read from global variable $session
final Variable var = myModule.resolveVariable(SessionModule.SESSION_VAR);
if(var == null || var.getValue() == null) {
//Always called as "invalidate") because the translation is made at compile time
if (!isCalledAs("invalidate"))
{throw new XPathException(this, SessionModule.SESSION_VAR + " not set");}
return Sequence.EMPTY_SEQUENCE;
}
if(var.getValue().getItemType() != Type.JAVA_OBJECT)
{throw new XPathException(this, SessionModule.SESSION_VAR + " is not bound to a Java object.");}
final JavaObjectValue value = (JavaObjectValue) var.getValue().itemAt(0);
if(value.getObject() instanceof SessionWrapper) {
final SessionWrapper session = (SessionWrapper)value.getObject();
session.invalidate();
return Sequence.EMPTY_SEQUENCE;
} else
{throw new XPathException(this, SessionModule.SESSION_VAR + " is not bound to a session object");}
}
}