/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. 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 <http://www.gnu.org/licenses/>.
*/
package net.sf.jasperreports.engine.fill;
import java.util.HashSet;
import java.util.Set;
/**
* @author Teodor Danciu (teodord@users.sourceforge.net)
* @version $Id: JRDistinctCountExtendedIncrementerFactory.java 3673 2010-04-01 13:14:19Z shertage $
*/
public class JRDistinctCountExtendedIncrementerFactory extends JRAbstractExtendedIncrementerFactory
{
/**
*
*/
private static JRDistinctCountExtendedIncrementerFactory mainInstance = new JRDistinctCountExtendedIncrementerFactory();
/**
*
*/
public JRDistinctCountExtendedIncrementerFactory()
{
}
/**
*
*/
public static JRDistinctCountExtendedIncrementerFactory getInstance()
{
return mainInstance;
}
/**
*
*/
public JRExtendedIncrementer getExtendedIncrementer(byte calculation)
{
return new JRDistinctCountExtendedIncrementer();
}
public static JRExtendedIncrementerFactory getFactory (Class valueClass)
{
return JRDistinctCountExtendedIncrementerFactory.getInstance();
}
}
/**
*
*/
class JRDistinctCountExtendedIncrementer extends JRAbstractExtendedIncrementer
{
private DistinctCountHolder lastHolder = new DistinctCountHolder();
/**
*
*/
public JRDistinctCountExtendedIncrementer()
{
}
/**
*
*/
public Object increment(
JRCalculable variable,
Object expressionValue,
AbstractValueProvider valueProvider
)
{
DistinctCountHolder holder = (DistinctCountHolder)variable.getIncrementedValue();
if (holder == null)
{
holder = lastHolder;
}
else
{
lastHolder = holder;
}
holder.addLastValue();
return new DistinctCountHolder(holder, expressionValue);
}
/**
*
*/
public Object combine(JRCalculable calculable1, JRCalculable calculable2, AbstractValueProvider valueProvider)
{
Set distinctValues = new HashSet();
DistinctCountHolder holder1 = (DistinctCountHolder)calculable1.getValue();
if (holder1 != null)
{
distinctValues.addAll(holder1.getDistinctValues());
if (holder1.getLastValue() != null)
{
distinctValues.add(holder1.getLastValue());
}
}
DistinctCountHolder holder2 = (DistinctCountHolder)calculable2.getValue();
if (holder2 != null)
{
distinctValues.addAll(holder2.getDistinctValues());
if (holder2.getLastValue() != null)
{
distinctValues.add(holder2.getLastValue());
}
}
return new DistinctCountHolder(distinctValues);
}
/**
*
*/
public Object initialValue()
{
return null;
}
}