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package com.sun.star.report.function.metadata;

import com.sun.star.report.ReportEngineParameterNames;

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.coretypes.TextType;

/**
 *
 * @author Ocke Janssen
 */
public class AuthorFunction implements Function
{

    public String getCanonicalName()
    {
        return "AUTHOR";
    }

    public TypeValuePair evaluate(final FormulaContext context, final ParameterCallback parameters)
            throws EvaluationException
    {
        if (parameters.getParameterCount() != 0)
        {
            throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
        }

        return new TypeValuePair(TextType.TYPE, context.getConfiguration().getConfigProperty(ReportEngineParameterNames.AUTHOR));
    }
}