Package org.exist.xquery.functions.session

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

/*
*  eXist Open Source Native XML Database
*  Copyright (C) 2010 The eXist Project
*  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 java.util.Date;

//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.Dependency;
import org.exist.xquery.Function;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.Profiler;
import org.exist.xquery.Variable;
import org.exist.xquery.XPathException;
import org.exist.xquery.XPathUtil;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.DateTimeValue;
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.Type;

/**
* Returns the time when this session was created, or
* January 1, 1970 GMT if it is an invalidated session
*
* @author José María Fernández (jmfg@users.sourceforge.net)
*/
public class GetCreationTime extends Function
{
//  private static final Logger logger = Logger.getLogger(GetAttribute.class);
 
  public final static FunctionSignature signature =
    new FunctionSignature(
      new QName( "get-creation-time", SessionModule.NAMESPACE_URI, SessionModule.PREFIX ),
      "Returns the time when this session was created. If a session does not " +
      "exist, a new one is created. If the session is already invalidated, it " +
      "returns January 1, 1970 GMT",
      null,
      new FunctionReturnSequenceType(Type.DATE_TIME, Cardinality.EXACTLY_ONE, "the date-time when the session was created" ) );
 
  public GetCreationTime( 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
  {
    if (context.getProfiler().isEnabled()) {
      context.getProfiler().start(this);      
      context.getProfiler().message(this, Profiler.DEPENDENCIES, "DEPENDENCIES", Dependency.getDependenciesName(this.getDependencies()));
      if (contextSequence != null)
        {context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT SEQUENCE", contextSequence);}
      if (contextItem != null)
        {context.getProfiler().message(this, Profiler.START_SEQUENCES, "CONTEXT ITEM", contextItem.toSequence());}
    }       
   
    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" ) );
      return( XPathUtil.javaObjectToXPath( Integer.valueOf(-1), context ) );
    }
   
    if( var.getValue().getItemType() != Type.JAVA_OBJECT ) {
      throw( new XPathException( this, "Variable $session is not bound to a Java object." ) );
    }

    final JavaObjectValue session = (JavaObjectValue)var.getValue().itemAt( 0 );
   
    if( session.getObject() instanceof SessionWrapper ) {
      try {
        final long creationTime = ( (SessionWrapper)session.getObject() ).getCreationTime();
        return new DateTimeValue(new Date(creationTime));
      }
      catch( final IllegalStateException ise ) {
        return new DateTimeValue(new Date(0));
      }
    } else {
      throw( new XPathException( this, "Type error: variable $session is not bound to a session object" ) );
    }
  }
}
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