/*!
* 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) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.libraries.formula.function.information;
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.ArrayCallback;
import org.pentaho.reporting.libraries.formula.typing.Type;
import org.pentaho.reporting.libraries.formula.typing.coretypes.AnyType;
public class IndexFunction implements Function
{
public IndexFunction()
{
}
public String getCanonicalName()
{
return "INDEX";
}
public TypeValuePair evaluate(final FormulaContext context,
final ParameterCallback parameters) throws EvaluationException
{
final int parameterCount = parameters.getParameterCount();
if (parameterCount < 2 || parameterCount > 4)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
}
final ArrayCallback arrayCallback =
context.getTypeRegistry().convertToArray(parameters.getType(0), parameters.getValue(0));
if (arrayCallback == null)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_NA_VALUE);
}
final Type rowType = parameters.getType(1);
final Object rowValue = parameters.getValue(1);
Number rowNumber;
if (rowValue == null)
{
rowNumber = null;
}
else
{
rowNumber = context.getTypeRegistry().convertToNumber(rowType, rowValue);
}
if (rowNumber == null)
{
rowNumber = new BigDecimal(1);
}
else if (rowNumber.intValue() <= 0)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
if (parameterCount == 3)
{
Number columnNumber;
final Type columnType = parameters.getType(2);
final Object columnValue = parameters.getValue(2);
if (columnValue == null)
{
columnNumber = null;
}
else
{
columnNumber = context.getTypeRegistry().convertToNumber(columnType, columnValue);
}
if (columnNumber == null)
{
columnNumber = new BigDecimal(1);
}
else if (columnNumber.intValue() <= 0)
{
throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
}
return new TypeValuePair(AnyType.TYPE, arrayCallback.getValue(rowNumber.intValue() - 1, columnNumber.intValue() - 1));
}
else
{
return new TypeValuePair(AnyType.TYPE, arrayCallback.getValue(rowNumber.intValue() - 1, 0));
}
}
}