// $Id: WindowingArgumentValidator.java,v 1.1.4.2 2003/08/18 22:09:44 cssharp Exp $

/*									tab:4
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 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
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/**
 * Provides default argument validator for windowing aggregates
 *
 * @author Eugene Shvets
 */

package net.tinyos.tinydb;

import java.util.List;

public class WindowingArgumentValidator implements AggregateArgumentValidator {

	public void validate(AggOp aggregate) {
		if (aggregate.getArguments().size() < 2) {
			throw new IllegalArgumentException("Windowing aggregate expects at least two arguments.");
		}
		
		if (aggregate.getArgument(0) < aggregate.getArgument(1)) {
			throw new IllegalArgumentException("Invalid temporal aggregate: window size cannot be less than sliding distance");
		}
	
	}
}
