public void ReadFromXml(string fileName)
{
try
{
var doc = new XmlDocument();
doc.Load(fileName);
var storageNodes = doc.GetElementsByTagName("flash_drive"); //reading all flash drives
if (storageNodes.Count > 0)
{
foreach (XmlElement storageNode in storageNodes)
{
FlashDrive newFlashDrive = new FlashDrive("");
foreach (XmlElement storageProps in storageNode)
{
switch (storageProps.Name)
{
case "name":
newFlashDrive.Name = storageProps.InnerText;
break;
case "producer":
newFlashDrive.Producer = storageProps.InnerText;
break;
case "model":
newFlashDrive.Model = storageProps.InnerText;
break;
case "quantity":
Int32.TryParse(storageProps.InnerText, out int qua);
newFlashDrive.Quantity = qua;
break;
case "price":
Decimal.TryParse(storageProps.InnerText, out decimal prc);
newFlashDrive.Price = prc;
break;
case "speed":
Double.TryParse(storageProps.InnerText, out double spd);
newFlashDrive.Speed = spd;
break;
case "memory_amount":
Int32.TryParse(storageProps.InnerText, out int mem);
newFlashDrive.MemoryAmount = mem;
break;
default:
break;
}
}
_storages.Add(newFlashDrive);
}
}
storageNodes = doc.GetElementsByTagName("hdd"); //reading all HDDs
if (storageNodes.Count > 0)
{
foreach (XmlElement storageNode in storageNodes)
{
Hdd newHdd = new Hdd("");
foreach (XmlElement storageProps in storageNode)
{
switch (storageProps.Name)
{
case "name":
newHdd.Name = storageProps.InnerText;
break;
case "producer":
newHdd.Producer = storageProps.InnerText;
break;
case "model":
newHdd.Model = storageProps.InnerText;
break;
case "quantity":
Int32.TryParse(storageProps.InnerText, out int qua);
newHdd.Quantity = qua;
break;
case "price":
Decimal.TryParse(storageProps.InnerText, out decimal prc);
newHdd.Price = prc;
break;
case "speed":
Double.TryParse(storageProps.InnerText, out double spd);
newHdd.Speed = spd;
break;
case "disk_size":
Int32.TryParse(storageProps.InnerText, out int dsz);
newHdd.DiskSize = dsz;
break;
default:
break;
}
}
_storages.Add(newHdd);
}
}
storageNodes = doc.GetElementsByTagName("dvd"); //reading all DVDs
if (storageNodes.Count > 0)
{
foreach (XmlElement storageNode in storageNodes)
{
Dvd newDvd = new Dvd("");
foreach (XmlElement storageProps in storageNode)
{
switch (storageProps.Name)
{
case "name":
newDvd.Name = storageProps.InnerText;
break;
case "producer":
newDvd.Producer = storageProps.InnerText;
break;
case "model":
newDvd.Model = storageProps.InnerText;
break;
case "quantity":
Int32.TryParse(storageProps.InnerText, out int qua);
newDvd.Quantity = qua;
break;
case "price":
Decimal.TryParse(storageProps.InnerText, out decimal prc);
newDvd.Price = prc;
break;
case "reading_speed":
Double.TryParse(storageProps.InnerText, out double rspd);
newDvd.ReadingSpeed = rspd;
break;
case "writing_speed":
Double.TryParse(storageProps.InnerText, out double wspd);
newDvd.WritingSpeed = wspd;
break;
default:
break;
}
}
_storages.Add(newDvd);
}
}
}
catch (FileNotFoundException)
{
Console.WriteLine("Such file does not exist!");
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
}
public void Change(int index, string value, DataStorage storage) //Method for changing some property of some Data Storage
{
if (_storages.Count == 0)
{
Console.WriteLine("There are no items!");
return;
}
if (!(_storages.Contains(storage)))
{
Console.WriteLine("Item doesn't belong to list");
return;
}
else
{
switch (index)
{
case 0: //if we want to change Name
storage.Name = value;
break;
case 1: //if we want to change Producer
storage.Producer = value;
break;
case 2: //if we want to change Model
storage.Model = value;
break;
case 3: //if we want to change Quantity
int quantity;
try
{
quantity = Int32.Parse(value);
}
catch (Exception)
{
Console.WriteLine("Invalid value!");
break;
}
storage.Quantity = quantity;
break;
case 4: //if we want to change price
decimal price;
try
{
price = Decimal.Parse(value);
}
catch (Exception)
{
Console.WriteLine("Invalid value!");
break;
}
storage.Price = price;
break;
case 5: //if we want to change the first unique class property
if (storage is Dvd) //if object is Dvd we changing the Writing Speed
{
double writingSpeed;
try
{
writingSpeed = Double.Parse(value);
}
catch (Exception)
{
Console.WriteLine("Invalid value!");
break;
}
Dvd dvd = storage as Dvd;
dvd.WritingSpeed = writingSpeed;
}
else if (storage is Hdd) //if object is Hdd we changing the Disk Size
{
int diskSize;
try
{
diskSize = Int32.Parse(value);
}
catch (Exception)
{
Console.WriteLine("Invalid value!");
break;
}
Hdd hdd = storage as Hdd;
hdd.DiskSize = diskSize;
}
else //if object is Flash Drive we changing the Memory Amount
{
int memoryAmount;
try
{
memoryAmount = Int32.Parse(value);
}
catch (Exception)
{
Console.WriteLine("Invalid value!");
break;
}
FlashDrive flashDrive = storage as FlashDrive;
flashDrive.MemoryAmount = memoryAmount;
}
break;
case 6: //if we want to change the second unique class property
double num; //one variable, cause second unqie class property anyway has type double
try
{
num = double.Parse(value);
}
catch (Exception)
{
Console.WriteLine("Invalid value!");
break;
}
if (storage is Dvd) //if object is Dvd we changing the Reading Speed
{
Dvd dvd = storage as Dvd;
dvd.ReadingSpeed = num;
}
else if (storage is Hdd) //if object is Hdd we changing the Speed
{
Hdd hdd = storage as Hdd;
hdd.Speed = num;
}
else //if object is Flash Drive we changing the Speed
{
FlashDrive flashDrive = storage as FlashDrive;
flashDrive.Speed = num;
}
break;
default: //if index is invalid
Console.WriteLine("Invalid index!");
break;
}
}
}
