I'm learning about Design Patterns using Unity and I'm not sure about how to solve the following problem with the Factory Method Pattern:
I want to read a XML file and using the Factory Method Pattern to create a Component (a Weapon) to add it to a GameObject which will be cointained on a Pool Manager, but Weapon "Is A" MonoBehaviour and for that reason It can't be instantiated using a "machineGun = new MachineGun();"
public abstract class WeaponFactoryMethod
{
protected string fileName = "weapons.xml";
public abstract Weapon CreateWeapon();
}
public class MachineGunFactoryMethod : WeaponFactoryMethod
{
public override Weapon CreateWeapon()
{
string filePath = Path.Combine(Application.streamingAssetsPath, fileName);
Weapon machineGun = null;
XmlReader xmlReader = new XmlTextReader(filePath);
if (xmlReader.ReadToDescendant("Weapons"))
{
if (xmlReader.ReadToDescendant("Weapon"))
{
do
{
// I CAN'T DO THIS:
machineGun = new MachineGun();
machineGun.ReadXml(xmlReader);
} while (xmlReader.ReadToNextSibling("Weapon"));
}
else
{
Debug.LogError("There aren't definition for Weapon");
}
}
else
{
Debug.LogError("There aren't definition for any Weapon");
}
return machineGun;
}
}
public abstract class Weapon : MonoBehaviour, IXmlSerializable
{
public float AttackRange { get; set; }
//Every weapons Shoots in a different way
public abstract void Shoot();
//Serialization
public XmlSchema GetSchema()
{
return null;
}
public void ReadXml(XmlReader reader)
{
XmlReader childReader = reader.ReadSubtree();
while (childReader.Read())
{
switch (childReader.Name)
{
case "AttackRange":
childReader.Read();
AttackRange = childReader.ReadContentAsInt();
break;
}
}
}
public void WriteXml(XmlWriter writer)
{
}
}
public class MachineGun : Weapon
{
public override void Shot()
{
//Raycasting..
}
}
At the end I want something like
GameObject (player)
- Component (A Weapon script with the data from the xml)
Should I just create a GameObject (player) and do an "AddComponent < MachineGun >" and later copy the info from the xml file instead using the Factory Method Pattern??
Is there a better way??
Any suggestions, corrections or advice will be very grateful.
I'm sorry by my English.
