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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see .
*/
package net.sf.jasperreports.data;
import java.util.List;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRRewindableDataSource;
/**
* @author Lucian Chirita ([email protected])
*/
public class RewindableDataSourceCollection
extends DataSourceCollection>
implements JRRewindableDataSource
{
public RewindableDataSourceCollection(List> dataSources) throws JRException
{
super(dataSources);
}
@Override
public void moveFirst() throws JRException
{
if (currentDataSource != null)
{
// rewind the current data source
currentDataSource.moveFirst();
}
int currentIndex = providerIterator.previousIndex();
// rewind all previous providers
while (providerIterator.hasPrevious())
{
RewindableDataSourceProvider provider = providerIterator.previous();
provider.rewind();
}
if (currentIndex > 0)
{
// we were not on the first data source, go back
start();
}
}
}