Package org.exist.xquery.functions.session

Source Code of org.exist.xquery.functions.session.GetID

/*
*  eXist Open Source Native XML Database
*  Copyright (C) 2001-09 Wolfgang M. Meier
*  wolfgang@exist-db.org
*  http://exist.sourceforge.net
*  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.Cardinality;
import org.exist.xquery.Function;
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.FunctionReturnSequenceType;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.JavaObjectValue;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.StringValue;
import org.exist.xquery.value.Type;

/**
* Returns the ID of the current session or an empty sequence
* if there is no session.
*
* @author Adam Retter <adam.retter@devon.gov.uk>
* @author Loren Cahlander
*/
public class GetID extends Function
{
//  private static final Logger logger = Logger.getLogger(GetID.class);

  public final static FunctionSignature signature = new FunctionSignature(
      new QName("get-id", SessionModule.NAMESPACE_URI, SessionModule.PREFIX),
      "Returns the ID of the current session or an empty sequence if there is no session.",
      null,
      new FunctionReturnSequenceType(Type.STRING, Cardinality.ZERO_OR_ONE, "the session ID")
  );
 
  public GetID(XQueryContext context)
  {
    super(context, signature);
  }
 
  /* (non-Javadoc)
   * @see org.exist.xquery.Expression#eval(org.exist.dom.DocumentSet, org.exist.xquery.value.Sequence, org.exist.xquery.value.Item)
   */
  public Sequence eval(Sequence contextSequence, Item contextItem) 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)
      {throw new XPathException(this, "Session not set");}
    if(var.getValue().getItemType() != Type.JAVA_OBJECT)
      {throw new XPathException(this, "Variable $session is not bound to an Java object.");}
    final JavaObjectValue session = (JavaObjectValue) var.getValue().itemAt(0);
   
    if(session.getObject() instanceof SessionWrapper)
    {
      final String id = ((SessionWrapper)session.getObject()).getId();
      if (id == null)
        {return Sequence.EMPTY_SEQUENCE;}
      return(new StringValue(id));
    }
    else
    {
      throw new XPathException(this, "Type error: variable $session is not bound to a session object");
    }
  }
}
TOP

Related Classes of org.exist.xquery.functions.session.GetID

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.