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: NowFunctionDescription.java 3521 2007-10-16 10:55:14Z tmorgner $
028     * ------------
029     * (C) Copyright 2006-2007, by Pentaho Corporation.
030     */
031    
032    package org.jfree.formula.function.datetime;
033    
034    import org.jfree.formula.function.AbstractFunctionDescription;
035    import org.jfree.formula.function.FunctionCategory;
036    import org.jfree.formula.typing.Type;
037    import org.jfree.formula.typing.coretypes.DateTimeType;
038    
039    /**
040     * Creation-Date: 04.11.2006, 18:59:11
041     *
042     * @author Thomas Morgner
043     */
044    public class NowFunctionDescription extends AbstractFunctionDescription
045    {
046      public NowFunctionDescription()
047      {
048        super("org.jfree.formula.function.datetime.Now-Function");
049      }
050    
051      public Type getValueType()
052      {
053        return DateTimeType.DATETIME_TYPE;
054      }
055    
056    
057      public boolean isVolatile()
058      {
059        return true;
060      }
061    
062      public int getParameterCount()
063      {
064        return 0;
065      }
066    
067      public Type getParameterType(final int position)
068      {
069        return null;
070      }
071    
072      /**
073       * Defines, whether the parameter at the given position is mandatory. A
074       * mandatory parameter must be filled in, while optional parameters need not
075       * to be filled in.
076       *
077       * @return
078       */
079      public boolean isParameterMandatory(final int position)
080      {
081        return true;
082      }
083    
084      public FunctionCategory getCategory()
085      {
086        return DateTimeFunctionCategory.CATEGORY;
087      }
088    }