/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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.
*
* Copyright (c) 2001 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.event;
import java.util.EventListener;
/**
* ReportListeners get informed whenever the state of a report changes. <P> You should be aware that most events occur
* more than once. For example, the reportStarted event will be triggered every time the report is regenerated. <P>
* When handling these events, use the reportState to track the current changes of the report.
*
* @author Thomas Morgner
*/
public interface ReportListener extends EventListener
{
/**
* Receives notification that report generation initializes the current run. <P> The event carries a
* ReportState.Started state. Use this to initialize the report.
*
* @param event The event.
*/
public void reportInitialized(ReportEvent event);
/**
* Receives notification that report generation has started. <P> The event carries a ReportState.Started state. Use
* this to prepare the report header.
*
* @param event The event.
*/
public void reportStarted(ReportEvent event);
/**
* Receives notification that report generation has finished (the last record is read and all groups are closed).
*
* @param event The event.
*/
public void reportFinished(ReportEvent event);
/**
* Receives notification that report generation has completed, the report footer was printed, no more output is done.
* This is a helper event to shut down the output service.
*
* @param event The event.
*/
public void reportDone(ReportEvent event);
/**
* Receives notification that a new group has started. <P> The group can be determined by the report state's
* getCurrentGroup() function.
*
* @param event The event.
*/
public void groupStarted(ReportEvent event);
/**
* Receives notification that a group is finished. <P> The group can be determined by the report state's
* getCurrentGroup() function.
*
* @param event The event.
*/
public void groupFinished(ReportEvent event);
/**
* Receives notification that a group of item bands is about to be processed. <P> The next events will be
* itemsAdvanced events until the itemsFinished event is raised.
*
* @param event The event.
*/
public void itemsStarted(ReportEvent event);
/**
* Receives notification that a group of item bands has been completed. <P> The itemBand is finished, the report
* starts to close open groups.
*
* @param event The event.
*/
public void itemsFinished(ReportEvent event);
/**
* Receives notification that a new row has been read. <P> This event is raised before an ItemBand is printed.
*
* @param event The event.
*/
public void itemsAdvanced(ReportEvent event);
}
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