/*!
* 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.userdefined;
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.TypeRegistry;
import org.pentaho.reporting.libraries.formula.typing.coretypes.AnyType;
import org.pentaho.reporting.libraries.formula.typing.sequence.RecursiveSequence;
import java.util.LinkedList;
public class ArrayRightFunction implements Function {
public ArrayRightFunction() {
}
public String getCanonicalName() {
return "ARRAYRIGHT";
}
public TypeValuePair evaluate( final FormulaContext context,
final ParameterCallback parameters ) throws EvaluationException {
final int parameterCount = parameters.getParameterCount();
if ( parameterCount < 1 || parameterCount > 2 ) {
throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE );
}
final TypeRegistry typeRegistry = context.getTypeRegistry();
final int length;
if ( parameterCount == 2 ) {
final Number lengthVal = typeRegistry.convertToNumber( parameters.getType( 1 ), parameters.getValue( 1 ) );
if ( lengthVal.doubleValue() < 0 ) {
throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE );
}
length = lengthVal.intValue();
} else {
length = 1;
}
if ( length < 0 ) {
throw EvaluationException.getInstance( LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE );
}
final RecursiveSequence text = new RecursiveSequence( parameters.getValue( 0 ), context );
final LinkedList list = new LinkedList();
while ( text.hasNext() ) {
final Object element = text.next();
list.add( element );
if ( list.size() > length ) {
list.remove( 0 );
}
}
final Object[] retval = list.toArray( new Object[ list.size() ] );
return new TypeValuePair( AnyType.ANY_ARRAY, retval );
}
}