/// <summary>
/// Loads job-shop scheduling problem input from file specified by <see cref="path"/> into <see cref="JobShop"/>.
/// </summary>
/// <param name="path">File path.</param>
/// <returns></returns>
public JobShop Load(string path, bool validate = true)
{
using (var reader = new StreamReader(path))
{
int[] jobsAndMachinesCount = reader.ReadLine().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();
int jobsCount = jobsAndMachinesCount[0];
var jobs = new List <Job>();
int operationId = 0;
for (int jobId = 0; jobId < jobsCount; jobId++)
{
var operations = new List <Operation>();
string[] lineArgs = reader.ReadLine().Split(new [] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
for (int order = 0; order < lineArgs.Length / 2; order++)
{
int machineId = int.Parse(lineArgs[order * 2]);
double cost = double.Parse(lineArgs[order * 2 + 1]);
cost = Math.Abs(cost) < double.Epsilon ? cost + 10e-6 : cost;
operations.Add(new Operation(operationId, jobId, machineId, order, cost));
operationId++;
}
jobs.Add(new Job(operations));
}
var jobShop = new JobShop(jobs, validate);
return(jobShop);
}
}
/// <summary>
/// Creates new instance of <see cref="JobShop"/>.
/// </summary>
/// <param name="jobOperationCounts">Array where index i contains number of operations that i-th job has.</param>
/// <param name="machinesCount">Total number of machines.</param>
/// <returns>Returns new instance of <see cref="JobShop"/>.</returns>
public JobShop Generate(int[] jobOperationCounts, int machinesCount)
{
var jobs = new List <Job>();
int maximumOperationCost = 50;
int lastFreeOperationId = 0;
for (int jobId = 0; jobId < jobOperationCounts.Length; jobId++)
{
int operationCount = jobOperationCounts[jobId];
var operations = new List <Operation>();
for (int operationOrder = 0; operationOrder < operationCount; operationOrder++)
{
int machineId = random.Next(0, machinesCount);
double operationCost = random.NextDouble() * maximumOperationCost;
var operation = new Operation(lastFreeOperationId, jobId, machineId, operationOrder, operationCost);
operations.Add(operation);
lastFreeOperationId++;
}
var job = new Job(operations);
jobs.Add(job);
}
var jobShop = new JobShop(jobs);
return(jobShop);
}