/*
* 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) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.formula.function.datetime;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.LocalizationContext;
import org.pentaho.reporting.libraries.formula.function.Function;
import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.coretypes.DateTimeType;
import org.pentaho.reporting.libraries.formula.util.DateUtil;
public class YesterdayFunction implements Function
{
private static final long serialVersionUID = -456933388664083206L;
public YesterdayFunction()
{
}
public String getCanonicalName()
{
return "YESTERDAY";
}
public TypeValuePair evaluate(final FormulaContext context,
final ParameterCallback parameters)
throws EvaluationException
{
final Date yesterday = yesterday(context);
final Date date = DateUtil.normalizeDate(yesterday, DateTimeType.DATE_TYPE);
return new TypeValuePair(DateTimeType.DATE_TYPE, date);
}
private static Date yesterday(final FormulaContext context)
{
final LocalizationContext localizationContext = context.getLocalizationContext();
final GregorianCalendar gc = new GregorianCalendar(localizationContext.getTimeZone(),
localizationContext.getLocale());
gc.setTime(context.getCurrentDate());
gc.set(Calendar.MILLISECOND, 0);
gc.add(Calendar.DAY_OF_MONTH, -1);
return gc.getTime();
}
}