/*******************************************************************************
 * Copyright (c) 2004, 2005 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.data.engine.aggregation.rank;

import org.eclipse.birt.data.engine.aggregation.BuiltInAggregationFactory;
import org.eclipse.birt.data.engine.api.aggregation.Accumulator;
import org.eclipse.birt.data.engine.core.DataException;

/**
 * Implements the built-in Total.isTopPercent aggregation.
 */
public class TotalIsTopNPercent extends BaseTopBottomAggregation
{
	/*
	 * (non-Javadoc)
	 * @see org.eclipse.birt.data.engine.api.aggregation.IAggregation#getName()
	 */
	public String getName( )
	{
		return BuiltInAggregationFactory.TOTAL_TOP_PERCENT_FUNC;
	}
	/*
	 * (non-Javadoc)
	 * @see org.eclipse.birt.data.engine.api.aggregation.IAggregation#newAccumulator()
	 */
	public Accumulator newAccumulator( )
	{
		return new MyAccumulator();
	}
	
	 private class MyAccumulator extends PercentAccumulator
	 {
		 /*
		  * (non-Javadoc)
		  * @see org.eclipse.birt.data.engine.aggregation.rank.PercentAccumulator#getNextIndex()
		  */
		protected int getNextIndex( ) throws DataException
		{
			return RankAggregationUtil.getNextTopIndex( cachedValues );
		}
	
	 }
}
