package org.pentaho.reporting.libraries.formula.function.math;
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.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.coretypes.NumberType;
public class NFunction implements Function
{
private static final TypeValuePair ZERO = new TypeValuePair(NumberType.GENERIC_NUMBER, BigDecimal.ZERO);
public NFunction()
{
}
public String getCanonicalName()
{
return "N";
}
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 value1 = parameters.getValue(0);
try
{
return new TypeValuePair(NumberType.GENERIC_NUMBER, context.getTypeRegistry().convertToNumber(type1, value1));
}
catch (EvaluationException e)
{
return ZERO;
}
}
}