/*
* 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.operators;
import java.math.BigDecimal;
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.lvalues.TypeValuePair;
import org.pentaho.reporting.libraries.formula.typing.TypeRegistry;
import org.pentaho.reporting.libraries.formula.typing.Type;
import org.pentaho.reporting.libraries.formula.typing.coretypes.NumberType;
/**
* Creation-Date: 10.04.2007, 15:02:39
*
* @author Thomas Morgner
*/
public abstract class AbstractNumericOperator implements InfixOperator
{
protected static final Number ZERO = new BigDecimal(0.0);
private static final long serialVersionUID = -1087959445157130705L;
protected AbstractNumericOperator()
{
}
public final TypeValuePair evaluate(final FormulaContext context,
final TypeValuePair value1,
final TypeValuePair value2)
throws EvaluationException
{
final TypeRegistry typeRegistry = context.getTypeRegistry();
if (value1 == null || value2 == null)
{
// If this happens, then one of the implementations has messed up.
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE);
}
final Object raw1 = value1.getValue();
final Object raw2 = value2.getValue();
if (raw1 == null || raw2 == null)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_NA_VALUE);
}
final Number number1 = convertToNumber(typeRegistry, value1.getType(), raw1, ZERO);
final Number number2 = convertToNumber(typeRegistry, value2.getType(), raw2, ZERO);
return new TypeValuePair(NumberType.GENERIC_NUMBER, evaluate(number1, number2));
}
protected abstract Number evaluate (final Number number1, final Number number2) throws EvaluationException;
private static Number convertToNumber (final TypeRegistry registry,
final Type type,
final Object value,
final Number defaultValue)
{
if (value == null)
{
return defaultValue;
}
try
{
return registry.convertToNumber(type, value);
}
catch (EvaluationException e)
{
return defaultValue;
}
}
}