closestfind.java

java写的Archreport

/**
	File Name:    	ClosestFind.java
	Author:	黄增博   #B02251132
	Date:		March 20 2004
	Description:	The ClosestFind class is used to find the artifact closest
                        to the provided ArchFind object.

**/

class ClosestFind{
	private ArchFind item;    // the provide item
	private ArchFind closestToItem; // the item closest to 'item'
	private double distance;	// the distance between the two items

	public ClosestFind(ArchFind it){
		item = it;
		closestToItem = null;	//null indicates there are no other items
		distance = Double.NaN;  // initialize distance to not a number;

	}
	/* If the find object is closer to the item object than
	* closestToItem object, then replace closestToItem by find
	*/
	public void update(ArchFind find){
		//if there is no current item, then find becomes closestToItem
		if(closestToItem==null){
			closestToItem = find;
			distance = closestToItem.distanceBetween(item);
			return;
		}
		/*provide the implementation that check distance,
		* and updates closestToItem if necessary
		*/
                else
                if(closestToItem.distanceBetween(item)>find.distanceBetween(item))
                closestToItem=find;
		}
	public ArchFind getClosest(){
		return closestToItem;//return closest to item
	}
}