/**
* ========================================
* JFreeReport : a free Java report library
* ========================================
*
* Project Info: http://reporting.pentaho.org/
*
* (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: GroupByExpression.java 6659 2008-12-02 15:35:06Z tmorgner $
* ------------
* (C) Copyright 2000-2005, by Object Refinery Limited.
* (C) Copyright 2005-2007, by Pentaho Corporation.
*/
package org.jfree.report.expressions.sys;
import java.util.ArrayList;
import java.util.Arrays;
import org.jfree.report.DataFlags;
import org.jfree.report.DataRow;
import org.jfree.report.DataSourceException;
import org.jfree.report.expressions.AbstractExpression;
/**
* Creation-Date: 08.10.2006, 16:28:37
*
* @author Thomas Morgner
*/
public class GroupByExpression extends AbstractExpression
{
private ArrayList fields;
private transient String[] fieldsCached;
public GroupByExpression()
{
this.fields = new ArrayList();
}
/**
* Return the current expression value. <P> The value depends (obviously) on
* the expression implementation.
*
* @return the value of the function.
*/
public Object computeValue() throws DataSourceException
{
final DataRow dr = getDataRow();
final String[] columns = getField();
for (int i = 0; i < columns.length; i++)
{
String column = columns[i];
DataFlags df = dr.getFlags(column);
if (df == null)
{
// invalid column or invalid implementation ...
continue;
}
if (df.isChanged())
{
//Log.debug ("Field: " + df.getName() + " has changed to " + df.getValue());
return Boolean.TRUE;
}
}
return Boolean.FALSE;
}
public void setField (final int index, final String field)
{
if (fields.size() == index)
{
fields.add(field);
}
else
{
fields.set(index, field);
}
fieldsCached = null;
}
public String getField (final int index)
{
return (String) fields.get(index);
}
public int getFieldCount ()
{
return fields.size();
}
public String[] getField ()
{
if (fieldsCached == null)
{
fieldsCached = (String[]) fields.toArray(new String[fields.size()]);
}
return (String[]) fieldsCached.clone();
}
public void setField (final String[] fields)
{
this.fields.clear();
this.fields.addAll(Arrays.asList(fields));
this.fieldsCached = (String[]) fields.clone();
}
public Object clone() throws CloneNotSupportedException
{
GroupByExpression co = (GroupByExpression) super.clone();
co.fields = (ArrayList) fields.clone();
co.fieldsCached = fieldsCached;
return co;
}
}