package edu.vt.marian.search;

import java.util.*;
import java.io.*;

import edu.vt.marian.common.*;


/**
 * A mapping from (weighted) single nodes along links of a particular class in
	a particular direction to all the connected nodes at the other end.
 *
 * @author Robert France
 * @see WtdObjToSetMapping
 * @see	LinkClassManager
 */

public class LinkSetMapping implements WtdObjToSetMapping
{
	protected Debug debug;
	protected LinkClassManager linkMgr;
	protected int dir;
	

	public LinkSetMapping(LinkClassManager linkManager, int direction, Debug d)
	{
		debug = d;

		if (linkManager == null)
			debug.dumpTrace("LinkSetMap:  null parameter.");
		linkMgr = linkManager;
		if (! LinkDesc.isValidDirection(direction) )
			debug.dumpTrace("LinkSetMap:  invalid direction " + direction + ".");
		dir = direction;
		
	}


	/**
	 * Add a new component set to the Sequencer with no scaling constant.
	 *
	 * @param	set	a component weighted object set.
	 * @return	ReturnValues.OK -- set was added without problems.
	 * <BR>		anything else -- problems.
	 */
	public WtdObjSet map(WtdObj key)
	{
		return( linkMgr.keyNodeToTargetSet(key, dir) );
	}
		

}