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/*************************************************************************************
 * Copyright (c) 2008 Actuate Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Actuate Corporation - Initial implementation.
 ************************************************************************************/

package org.eclipse.birt.report.session;

import java.util.Date;

/**
 * This interface provides methods for a BIRT viewing session.
 * 
 */
public interface IViewingSession
{

	/**
	 * Returns the BIRT viewing session ID.
	 * 
	 * @return BIRT viewing session id
	 */
	public abstract String getId( );

	/**
	 * Returns the last access Date.
	 * 
	 * @return last access date
	 */
	public abstract Date getLastAccess( );

	/**
	 * Refreshes the session by setting its last access date to the current
	 * date.
	 * @throws IllegalStateException if the session has expired
	 */
	public abstract void refresh( );

	/**
	 * Returns the document path name according to given report name.
	 * 
	 * @param request
	 *            HTTP request
	 * @param reportFile
	 *            name of the report design file
	 * @param id
	 *            viewer id, or null
	 * @return cached document file path name
	 * @throws IllegalStateException if the session has expired
	 */
	public abstract String getCachedReportDocument( String reportFile,
			String viewerId );

	/**
	 * Returns the image temp folder for the current session.
	 * 
	 * @param request
	 *            request
	 * @return temp folder
	 * @throws IllegalStateException if the session has expired
	 */
	public abstract String getImageTempFolder( );

	/**
	 * Returns whether this session has expired or was invalidated.
	 * 
	 * @return true if the session has expired
	 */
	public abstract boolean isExpired( );

	/**
	 * Invalidates the session.
	 * @throws IllegalStateException if the session is locked
	 */
	public abstract void invalidate( );

	/**
	 * Adds a lock to this session to prevents its expiration.
	 * @throws IllegalStateException if the session has expired
	 */
	public abstract void lock();

	/**
	 * Removes a lock to this session to prevents its expiration.
	 * @throws IllegalStateException if the session has expired
	 */
	public abstract void unlock();	
	
	/**
	 * Returns whether this session is locked.
	 * 
	 * @return true if the session is locked, false otherwise
	 */
	public abstract boolean isLocked( );

}