/**
* =========================================
* LibFormula : a free Java formula library
* =========================================
*
* Project Info: http://reporting.pentaho.org/libformula/
*
* (C) Copyright 2006-2008, by 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.]
*
*
* ------------
* DateFunction.java
* ------------
*/
package org.pentaho.reporting.libraries.formula.function.datetime;
import org.pentaho.reporting.libraries.formula.EvaluationException;
import org.pentaho.reporting.libraries.formula.FormulaContext;
import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
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.TypeRegistry;
import org.pentaho.reporting.libraries.formula.typing.coretypes.DateTimeType;
import org.pentaho.reporting.libraries.formula.util.DateUtil;
/**
* Creation-Date: 04.11.2006, 18:59:11
*
* @author Thomas Morgner
*/
public class DateFunction implements Function
{
private static final long serialVersionUID = 4956151361696995668L;
public DateFunction()
{
}
public String getCanonicalName()
{
return "DATE";
}
public TypeValuePair evaluate(final FormulaContext context,
final ParameterCallback parameters) throws EvaluationException
{
if (parameters.getParameterCount() != 3)
{
throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
}
final TypeRegistry typeRegistry = context.getTypeRegistry();
final Number n1 = typeRegistry.convertToNumber(parameters.getType(0), parameters.getValue(0));
final Number n2 = typeRegistry.convertToNumber(parameters.getType(1), parameters.getValue(1));
final Number n3 = typeRegistry.convertToNumber(parameters.getType(2), parameters.getValue(2));
if (n1 == null || n2 == null || n3 == null)
{
throw new EvaluationException(
LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
final LocalizationContext localizationContext = context
.getLocalizationContext();
final java.sql.Date date = DateUtil.createDate(n1.intValue(),
n2.intValue(), n3.intValue(), localizationContext);
return new TypeValuePair(DateTimeType.DATE_TYPE, date);
}
}