001    /**
002     * =========================================
003     * LibFormula : a free Java formula library
004     * =========================================
005     *
006     * Project Info:  http://reporting.pentaho.org/libformula/
007     *
008     * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
009     *
010     * This library is free software; you can redistribute it and/or modify it under the terms
011     * of the GNU Lesser General Public License as published by the Free Software Foundation;
012     * either version 2.1 of the License, or (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015     * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016     * See the GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public License along with this
019     * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020     * Boston, MA 02111-1307, USA.
021     *
022     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023     * in the United States and other countries.]
024     *
025     *
026     * ------------
027     * $Id: NowFunction.java 2847 2007-05-21 18:57:59Z mimil $
028     * ------------
029     * (C) Copyright 2006-2007, by Pentaho Corporation.
030     */
031    
032    package org.jfree.formula.function.datetime;
033    
034    import java.util.Date;
035    
036    import org.jfree.formula.EvaluationException;
037    import org.jfree.formula.FormulaContext;
038    import org.jfree.formula.LocalizationContext;
039    import org.jfree.formula.function.Function;
040    import org.jfree.formula.function.ParameterCallback;
041    import org.jfree.formula.lvalues.TypeValuePair;
042    import org.jfree.formula.typing.coretypes.DateTimeType;
043    import org.jfree.formula.util.DateUtil;
044    
045    /**
046     * Return the serial number of the current date and time. This returns the current day and time serial number, using the
047     * current locale. If you want only the serial number of the current day, use TODAY.
048     *
049     * @author Thomas Morgner
050     * @since 23.03.2007
051     */
052    public class NowFunction implements Function
053    {
054      public NowFunction()
055      {
056      }
057    
058      public String getCanonicalName()
059      {
060        return "NOW";
061      }
062    
063      public TypeValuePair evaluate(final FormulaContext context,
064                                    final ParameterCallback parameters)
065          throws EvaluationException
066      {
067        final LocalizationContext localizationContext = context.getLocalizationContext();
068        final Date now = DateUtil.now(localizationContext);
069    
070        final Date date = DateUtil.normalizeDate(now, DateTimeType.DATETIME_TYPE);
071        return new TypeValuePair(DateTimeType.DATETIME_TYPE, date);
072      }
073    }