Package org.pentaho.reporting.libraries.formula.function.datetime

Source Code of org.pentaho.reporting.libraries.formula.function.datetime.DateTimeValueFunction

/*
* 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.Date;

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.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.Type;
import org.pentaho.reporting.libraries.formula.typing.TypeRegistry;
import org.pentaho.reporting.libraries.formula.typing.coretypes.DateTimeType;

/**
* This function returns
*
*
* @author Cedric Pronzato
*/
public class DateTimeValueFunction implements Function
{
  private static final long serialVersionUID = -906531902889630172L;

  public DateTimeValueFunction()
  {
  }

  public String getCanonicalName()
  {
    return "DATETIMEVALUE";
  }

  public TypeValuePair evaluate(final FormulaContext context,
      final ParameterCallback parameters) throws EvaluationException
  {
    if (parameters.getParameterCount() != 1)
    {
      throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
    }

    final TypeRegistry typeRegistry = context.getTypeRegistry();
    final Type type = parameters.getType(0);
    final Object value = parameters.getValue(0);

    final Date date1 = typeRegistry.convertToDate(type, value);
    return new TypeValuePair(DateTimeType.DATETIME_TYPE, date1);

  }
}
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