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: TimeFunction.java 3522 2007-10-16 10:56:57Z tmorgner $
028 * ------------
029 * (C) Copyright 2006-2007, by Pentaho Corporation.
030 */
031 package org.jfree.formula.function.datetime;
032
033 import java.sql.Time;
034
035 import org.jfree.formula.EvaluationException;
036 import org.jfree.formula.FormulaContext;
037 import org.jfree.formula.LibFormulaErrorValue;
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.TypeRegistry;
043 import org.jfree.formula.typing.coretypes.DateTimeType;
044 import org.jfree.formula.util.DateUtil;
045
046 /**
047 * This fonction constructs a time from hours, minutes, and seconds.
048 *
049 * @author Cedric Pronzato
050 */
051 public class TimeFunction implements Function
052 {
053 public TimeFunction()
054 {
055 }
056
057 public String getCanonicalName()
058 {
059 return "TIME";
060 }
061
062 public TypeValuePair evaluate(final FormulaContext context,
063 final ParameterCallback parameters) throws EvaluationException
064 {
065 if (parameters.getParameterCount() != 3)
066 {
067 throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
068 }
069 final Number n1;
070 final Number n2;
071 final Number n3;
072 try
073 {
074 final TypeRegistry typeRegistry = context.getTypeRegistry();
075 n1 = typeRegistry.convertToNumber(parameters.getType(0), parameters
076 .getValue(0));
077 n2 = typeRegistry.convertToNumber(parameters.getType(1), parameters
078 .getValue(1));
079 n3 = typeRegistry.convertToNumber(parameters.getType(2), parameters
080 .getValue(2));
081 } catch (NumberFormatException e)
082 {
083 throw new EvaluationException(
084 LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
085 }
086
087 if (n1 == null || n2 == null || n3 == null)
088 {
089 throw new EvaluationException(
090 LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
091 }
092 final int hours = n1.intValue();
093 final int minutes = n2.intValue();
094 final int seconds = n3.intValue();
095
096 final LocalizationContext localizationContext = context
097 .getLocalizationContext();
098 final Time time = DateUtil.createTime(hours, minutes, seconds,
099 localizationContext);
100
101 return new TypeValuePair(DateTimeType.TIME_TYPE, time);
102 }
103 }