/*
* 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.information;
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.LogicalType;
/**
* This function retruns true if the given value is an odd number.
*
* @author Cedric Pronzato
*
*/
public class IsOddFunction implements Function
{
private static final TypeValuePair RETURN_TRUE = new TypeValuePair(
LogicalType.TYPE, Boolean.TRUE);
private static final TypeValuePair RETURN_FALSE = new TypeValuePair(
LogicalType.TYPE, Boolean.FALSE);
private static final long serialVersionUID = 4967067216812927973L;
public IsOddFunction()
{
}
public TypeValuePair evaluate(final FormulaContext context,
final ParameterCallback parameters) throws EvaluationException
{
final int parameterCount = parameters.getParameterCount();
if (parameterCount < 1)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
}
final Type type1 = parameters.getType(0);
final Object value = parameters.getValue(0);
final TypeRegistry typeRegistry = context.getTypeRegistry();
final Number number = typeRegistry.convertToNumber(type1, value);
if (number == null)
{
throw EvaluationException.getInstance(
LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
int intValue = number.intValue();
if (intValue < 0)
{
intValue *= -1;
}
if (intValue % 2 == 1)
{
return RETURN_TRUE;
}
return RETURN_FALSE;
}
public String getCanonicalName()
{
return "ISODD";
}
}