/// <summary>
/// Adds the specified component using the <see cref="EntityComponent.DefaultKey" />.
/// </summary>
/// <param name="component">The component.</param>
/// <exception cref="System.ArgumentNullException">component</exception>
public void Add(EntityComponent component)
{
if (component == null)
{
throw new ArgumentNullException("component");
}
Components.SetObject(component.GetDefaultKey(), component);
}
/// <summary>
/// Gets or create a component with the specified key.
/// </summary>
/// <typeparam name="T">Type of the entity component</typeparam>
/// <returns>A new or existing instance of {T}</returns>
public T GetOrCreate <T>() where T : EntityComponent, new()
{
var key = EntityComponent.GetDefaultKey <T>();
var component = Components.Get(key);
if (component == null)
{
component = new T();
Components.SetObject(key, component);
}
return((T)component);
}
/// <summary>
/// Gets a component by the specified key.
/// </summary>
/// <typeparam name="T">Type of the component</typeparam>
/// <returns>The component or null if does no exist</returns>
/// <exception cref="System.ArgumentNullException">key</exception>
public T Get <T>() where T : EntityComponent, new()
{
return((T)Components.Get(EntityComponent.GetDefaultKey <T>()));
}