package org.simantics.interop.mapping.data;

import java.util.Comparator;

public class DistanceComparator<T> implements Comparator<GraphNode<T>> {

	private String rel;
	private String inv;
	
	public DistanceComparator(String rel, String inv) {
		this.rel = rel;
		this.inv = inv;
	}
	
	@Override
	public int compare(GraphNode<T> arg0, GraphNode<T> arg1) {
		int dist = arg0.distanceTo(arg1, rel, inv);
		if (dist < 0) {
			dist = arg0.distanceTo(arg1, inv, rel);
			if (dist < 0)
				return 0;
			return -dist;
		} else {
			return dist;
		}
		
	}
}