/*
* 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.data;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import net.sf.jasperreports.engine.JRField;
import net.sf.jasperreports.engine.JRRewindableDataSource;
/**
* @author Teodor Danciu (teodord@users.sourceforge.net)
* @version $Id: JRMapCollectionDataSource.java 3033 2009-08-27 11:46:22Z teodord $
*/
public class JRMapCollectionDataSource implements JRRewindableDataSource
{
/**
*
*/
private Collection records = null;
private Iterator iterator = null;
private Map currentRecord = null;
/**
*
*/
public JRMapCollectionDataSource(Collection col)
{
records = col;
if (records != null)
{
iterator = records.iterator();
}
}
/**
*
*/
public boolean next()
{
boolean hasNext = false;
if (iterator != null)
{
hasNext = iterator.hasNext();
if (hasNext)
{
currentRecord = (Map)iterator.next();
}
}
return hasNext;
}
/**
*
*/
public Object getFieldValue(JRField field)
{
Object value = null;
if (currentRecord != null)
{
value = currentRecord.get(field.getName());
}
return value;
}
/**
*
*/
public void moveFirst()
{
if (records != null)
{
iterator = records.iterator();
}
}
/**
* Returns the underlying map collection used by this data source.
*
* @return the underlying map collection
*/
public Collection getData()
{
return records;
}
/**
* Returns the total number of records/maps that this data source
* contains.
*
* @return the total number of records of this data source
*/
public int getRecordCount()
{
return records == null ? 0 : records.size();
}
/**
* Clones this data source by creating a new instance that reuses the same
* underlying map collection.
*
* @return a clone of this data source
*/
public JRMapCollectionDataSource cloneDataSource()
{
return new JRMapCollectionDataSource(records);
}
}