/*!
* 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) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.plugin.jfreereport.reportcharts;
import org.jfree.chart.labels.PieToolTipGenerator;
import org.jfree.data.general.PieDataset;
import org.pentaho.reporting.engine.classic.core.StaticDataRow;
import org.pentaho.reporting.engine.classic.core.function.ExpressionRuntime;
import org.pentaho.reporting.engine.classic.core.function.FormulaExpression;
import org.pentaho.reporting.engine.classic.core.function.GenericExpressionRuntime;
import org.pentaho.reporting.engine.classic.core.function.WrapperExpressionRuntime;
import org.pentaho.reporting.engine.classic.core.util.IntegerCache;
public class FormulaPieTooltipGenerator implements PieToolTipGenerator
{
private FormulaExpression formulaExpression;
private GenericExpressionRuntime runtime;
private static final String[] ADDITIONAL_COLUMN_KEYS = new String[]{
"chart::key", "chart::keys",
"chart::item", "chart::items",
"chart::pie-index"
};
public FormulaPieTooltipGenerator(final ExpressionRuntime runtime,
final String formula)
{
this.runtime = new GenericExpressionRuntime(runtime);
this.formulaExpression = new FormulaExpression();
this.formulaExpression.setFormula(formula);
}
/**
* Generates a tool tip text item for the specified item in the dataset.
* This method can return <code>null</code> to indicate that no tool tip
* should be displayed for an item.
*
* @param dataset the dataset (<code>null</code> not permitted).
* @param key the section key (<code>null</code> not permitted).
* @return The tool tip text (possibly <code>null</code>).
*/
public String generateToolTip(PieDataset dataset, Comparable key)
{
try
{
final Object[] keys = dataset.getKeys().toArray();
final Object[] items = new Object[keys.length];
for (int i = 0; i < keys.length; i++)
{
items[i] = dataset.getValue(i);
}
final Object[] values = new Object[]{
key, keys,
dataset.getValue(key), items,
IntegerCache.getInteger(dataset.getIndex(key))
};
formulaExpression.setRuntime(new WrapperExpressionRuntime
(new StaticDataRow(ADDITIONAL_COLUMN_KEYS, values), runtime));
final Object o = formulaExpression.getValue();
if (o == null)
{
return null;
}
return String.valueOf(o);
}
finally
{
formulaExpression.setRuntime(null);
}
}
}