/*******************************************************************************
 * Copyright (c) 2006 IBM 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:
 *     IBM Corporation - Jeff Briggs, Henry Hughes, Ryan Morse
 *******************************************************************************/

package org.eclipse.linuxtools.systemtap.graphingapi.core.aggregates;

public class CountAggregate implements IDataAggregate {

	/**
	 * Ensure column isn't empty, then get the count of the column's values.
	 *
	 * @param column The column to count.
	 *
	 * @return Count of that column's values.
	 */
	@Override
	public Number aggregate(Number[] column) {
		if(column == null || column.length == 0)
			return null;

		int num = 0;

		for(int i=0; i<column.length; i++)
			num++;

		return Integer.valueOf(num);
	}

	@Override
	public String getID() {
		return ID;
	}

	public static final String ID = "org.eclipse.linuxtools.systemtap.graphingapi.core.aggregates.CountAggregate"; //$NON-NLS-1$
}
