aggregateresultsreader.java

来自「tinyos最新版」· Java 代码 · 共 71 行

// $Id: AggregateResultsReader.java,v 1.5 2003/10/07 21:46:07 idgay Exp $

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package net.tinyos.tinydb;

/**
 * This interface interprets data read from QueryResultMessage
 * in an aggregate-specific way; calculates the final value
 * of the aggregate; and provides access to this value
 * through getValue accessor
 *
 * @author Eugene Shvets
 * @version 1.0, October 23, 2002
 *
 *
 * Changed 11.3.2002 to use objects for state.  SRM.
 */
public interface AggregateResultsReader {
	
	
	/**
	 * Reads data from the raw byte result data
	 */
    public void read(byte[] data);
	
	/**
	 * Calculates final value of the aggregate
	 * This value can be fetched via getValue
	 */
	public void finalizeValue();
	
	/**
	 * Returns a string representation of the finalized value
	 * @return string representation of the finalized value
	 */
	public String getValue();
	
	/**
	 * Copies result state of this reader into argument reader
	 * @throws IllegalArgumentException if reader is of a wrong class
	 */
	public void copyResultState(AggregateResultsReader reader) throws IllegalArgumentException;
}