Class GenericFactory<TKey, TProduct>

Namespace

WitShells.DesignPatterns.Core

A generic, key-based Factory that creates new product instances on demand. Creator delegates are registered once and called every time a new object is needed, so each call to Create(TKey) returns a fresh instance.

public class GenericFactory<TKey, TProduct>

Type Parameters

TKey

The lookup key type (e.g. a string, enum, or int).

TProduct

The base type or interface of the objects being created.

Inheritance

object

GenericFactory<TKey, TProduct>

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Examples

var factory = new GenericFactory<string, IWeapon>();
factory.Register("sword", () => new Sword());
factory.Register("bow",   () => new Bow());
IWeapon weapon = factory.Create("sword");

Remarks

Use GenericSingleFactory<TKey, TProduct> instead when you want exactly one instance per key (singleton-per-key semantics).

Methods

Create(TKey)

Creates and returns a new product for the given key by invoking its registered creator.

public TProduct Create(TKey key)

Parameters

key TKey

The key whose creator should be invoked.

Returns

TProduct

A new instance of the product.

Exceptions

ArgumentException

Thrown when no creator has been registered for key.

Register(TKey, Func<TProduct>)

Registers a creator delegate for the given key. If the key is already registered the call is silently ignored.

public void Register(TKey key, Func<TProduct> creator)

Parameters

key TKey

The key to associate with the creator.

creator Func<TProduct>

A delegate that returns a new product instance.