/*!
* 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.reporting.engine.classic.core.modules.output.table.xls.helper;
import java.awt.Color;
import java.util.HashMap;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
public class DynamicExcelColorProducer implements ExcelColorProducer
{
private short lastUsedColor = 0x8; // this magic constant stands for first color index in a palette
private HSSFWorkbook workbook;
private Map<String,HSSFColor> usedTripplets;
public DynamicExcelColorProducer(final HSSFWorkbook workbook)
{
if (workbook == null)
{
throw new NullPointerException();
}
this.workbook = workbook;
this.usedTripplets = new HashMap<String,HSSFColor>();
}
public HSSFColor getColor(final short index)
{
final HSSFPalette palette = workbook.getCustomPalette();
return palette.getColor(index);
}
public short getNearestColor(final Color awtColor)
{
if (lastUsedColor > 64)
{
// we ran out of palette... try to get nearest color then
return StaticExcelColorSupport.getNearestColor(awtColor, usedTripplets);
}
final HSSFPalette palette = workbook.getCustomPalette();
final HSSFColor hssfColor = palette.findColor((byte) awtColor.getRed(),
(byte) awtColor.getGreen(),
(byte) awtColor.getBlue());
if (hssfColor != null && hssfColor.getIndex() < lastUsedColor)
{
return hssfColor.getIndex();
}
else
{
palette.setColorAtIndex(lastUsedColor, (byte) awtColor.getRed(),
(byte) awtColor.getGreen(),
(byte) awtColor.getBlue());
final HSSFColor color = palette.getColor(lastUsedColor);
usedTripplets.put(color.getHexString(), color);
return lastUsedColor++;
}
}
}