import?java.io.*;
import?java.awt.Point;

/**
?*?CVRPData.java
?*
?*?This?class?reads?in?a?CVRP?data?file?and?provides?“get?methods“?to
?*?access?the?demand?and?distance?information.?It?does?some
?*?parameter?checking?to?make?sure?that?nodes?passed?to?the?get
?*?methods?are?within?the?valid?range.
?*
?*?It?should?be?initialised?by?calling?readFile（）.?
?*
?*?@author?Tim?Kovacs
?*?@version?20/10/2013
?*/

public?class?CVRPData?{

????/**?The?capacity?that?each?vehicle?has?*/
????public?static?int?VEHICLE_CAPACITY;

????/**?The?number?of?nodes?in?the?fruitybun?CVRP?i.e.?the?depot?and?the?customers?*/
????public?static?int?NUM_NODES;

????/**?This?is?only?used?for?testing.?Normally?the?class?is?initialised?by?calling?readFile（）?*/
????public?static?void?main（String[]?dataFileName）?throws?FileNotFoundException?IOException?{
	if?（dataFileName.length?!=?1）
	????quit（“I?need?exactly?1?argument:?the?name?of?the?data?file?to?read“）;

	readFile（dataFileName[0]）;
????}

????/**?Return?the?demand?for?a?given?node.?*/
????public?static?int?getDemand（int?node）?{
	if?（!nodeIsValid（node））?{
	????System.err.println（“Error:?demand?for?node?“?+?node?+?
			???????“?was?requested?from?getDemand（）?but?only?nodes?1..“?+?NUM_NODES?+?“?exist“）;
	????System.exit（-1）;
	}	????
	return?demand[node];
????}
????????
????/**?Return?the?Euclidean?distance?between?the?two?given?nodes?*/
????public?static?double?getDistance（int?node1?int?node2）?{
	if?（!nodeIsValid（node1））?{
	????System.err.println（“Error:?distance?for?node?“?+?node1?+?
			???????“?was?requested?from?getDistance（）?but?only?nodes?1..“?+?NUM_NODES?+?“?exist“）;
	????System.exit（-1）;
	}	????
	
	if?（!nodeIsValid（node2））?{
	????System.err.println（“Error:?distance?for?node?“?+?node2?+?
			???????“?was?requested?from?getDistance（）?but?only?nodes?1..“?+?NUM_NODES?+?“?exist“）;
	????System.exit（-1）;
	}	????

	int?x1?=?coords[node1][X_COORDINATE];
	int?y1?=?coords[node1][Y_COORDINATE];
	int?x2?=?coords[node2][X_COORDINATE];
	int?y2?=?coords[node2][Y_COORDINATE];

	//?compute?Euclidean?distance
	return?Math.sqrt（Math.pow（（x1-x2）2）?+?Math.pow（（y1-y2）2））;

????//?For?example?the?distance?between?3344?and?4413?is:
????//?33-44?=?-11?and?11^2?=?121
????//?44-13?=?31?and?31^2?=?961
????//?121?+?961?=?1082
????//?The?square?root?of?1082?=?32.893768...
????}????

????//*?Return?the?absolute?co-ordinates?of?the?given?node?*/
????public?static?Point?getLocation（int?node）?{
??????if?（!nodeIsValid（node））?{
	System.err.println（“Error:?Request?for?location?of?non-existent?node?“?+?node?+?“.“）;
	System.exit（-1）;
??????}

??????return?new?Point（coords[node][X_COORDINATE]?coords[node][Y_COORDINATE]）;
????}

????/**?Return?true?if?the?given?node?is?within?the?valid?range?（1..NUM_NODES）?false?otherwise?*/
????private?static?boolean?nodeIsValid（int?node）?{
	if?（node??NUM_NODES）
	????return?false;
	else
	????return?true;
????}
????
????private?static?final?int?X_COORDINATE?=?0;?//?x-axis?coordinate?is?dimension?0?in?coords[][]

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-11-17?21:00??CVRP-master\
?????文件??????121190??2016-11-17?21:00??CVRP-master\COMSM0305-1.pdf
?????文件??????148903??2016-11-17?21:00??CVRP-master\COMSM0305-2.pdf
?????文件??????112511??2016-11-17?21:00??CVRP-master\COMSM0305-2print.pdf
?????目錄???????????0??2016-11-17?21:00??CVRP-master\CVRP\
?????文件????????6356??2016-11-17?21:00??CVRP-master\CVRP\CVRPData.java
?????文件???????17752??2016-11-17?21:00??CVRP-master\CVRP\CVRPValidater.jar
?????文件????????4260??2016-11-17?21:00??CVRP-master\CVRP\fruitybun250.vrp
?????文件?????3175807??2016-11-17?21:00??CVRP-master\SuttonBook.pdf