class CSubGraph {
	
	var _parent; 
	
	function CSubGraph(wParent) {
		_parent = wParent; 
		links = [ ]; 
	}
	
	private var links;
	
	/* creation & modification */ 
	
	function addLink(wLink) {
		links.push(wLink); 
	}
	
	/* mathematical */ 
	
	function equals(aSG) {
		if (links.length != aSG.links.length) return false;
		var found; 
		for (var i in links) {
			found = false; 
			for (var j in aSG.links) {
				if (links[i] === aSG.links[j]) {
					found = true;
					break;
				}
			}
			if (!found) return false;
		}
		return true; 
	}
	
	/* visual */ 
	
	function highlight(wColor) {
		for (var i in links) {
			_parent.getLink(links[i]).highlight(wColor); 
		}
	}
}