package com.jamonapi;

import java.util.*;
import com.jamonapi.utils.*;

/** Buffer used to keep the last N recent array values based on the comparator.  Note the Comparator must
 * be thread safe.  It can also stored the last n recent values of ToArray objects.  By using various Comparators
 * you can determine what should stay in the buffer and what should be removed.  JAMon comes with a number of buffers
 * based on this class.
 * @author steve souza
 *
 */


public class NExtremeArrayBufferHolder extends NExtremeBufferHolder {

	
	/** Constructor that takes a JAMonArrayComparator that can be used to determine
	 * when values should be removed from  and added to the array.  This can be used to 
	 * decide what to do to values in the buffer based on multiple columns.
	 * @param comparator
	 */
	public NExtremeArrayBufferHolder(JAMonArrayComparator comparator) {
		super(true);
		setComparator(comparator);		
	}

	/** Pass true for natural order, and false for reverse order and column number in Object[] to compare starting at 0 */
	public NExtremeArrayBufferHolder(boolean naturalOrder, int colToCompare) {
		super(new JAMonArrayComparator(colToCompare, naturalOrder));		
	}
	
	/** Note the only valid Comparator to be passed is JAMonArrayComparator */
	public void setComparator(Comparator comparator) {
		if (comparator instanceof JAMonArrayComparator)
			super.setComparator(comparator);
	}

    
	/** Factory method that returns a usable copy of this object */
	public BufferHolder copy() {
	    return new NExtremeArrayBufferHolder((JAMonArrayComparator)getComparator());
    }

}