/// <summary>
/// Returns true if system with TSystem type exists
/// </summary>
/// <typeparam name="TSystem"></typeparam>
/// <returns></returns>
public bool HasSystem <TSystem>() where TSystem : class, ISystemBase, new()
{
if (this.world == null)
{
SystemGroupRegistryException.Throw();
}
for (int i = 0, count = this.systems.Length; i < count; ++i)
{
if (this.systems.arr[i] is TSystem)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Get first system by type
/// </summary>
/// <typeparam name="TSystem"></typeparam>
/// <returns></returns>
public TSystem GetSystem <TSystem>() where TSystem : class, ISystemBase
{
if (this.world == null)
{
SystemGroupRegistryException.Throw();
}
for (int i = 0, count = this.systems.Count; i < count; ++i)
{
var system = this.systems.arr[i];
if (system is TSystem tSystem)
{
return(tSystem);
}
}
return(default);
/// <summary>
/// Add system by type
/// Retrieve system from pool, OnConstruct() call
/// </summary>
/// <typeparam name="TSystem"></typeparam>
public bool AddSystem <TSystem>() where TSystem : class, ISystemBase, new()
{
if (this.world == null)
{
SystemGroupRegistryException.Throw();
}
var instance = PoolSystems.Spawn <TSystem>();
if (this.AddSystem(instance) == false)
{
instance.world = null;
PoolSystems.Recycle(ref instance);
return(false);
}
return(true);
}
/// <summary>
/// Add system manually
/// Pool will not be used, OnConstruct() call
/// </summary>
/// <param name="instance"></param>
public bool AddSystem(ISystemBase instance)
{
if (this.world == null)
{
SystemGroupRegistryException.Throw();
}
WorldUtilities.SetWorld(this.world);
instance.world = this.world;
if (instance is ISystemValidation instanceValidate)
{
if (instanceValidate.CouldBeAdded() == false)
{
instance.world = null;
return(false);
}
}
var k = this.length;
ArrayUtils.Resize(in k, ref this.systems, resizeWithOffset: false);
ArrayUtils.Resize(in k, ref this.statesSystems, resizeWithOffset: false);
++this.length;
this.systems.arr[k] = instance;
this.statesSystems.arr[k] = ModuleState.AllActive;
instance.OnConstruct();
if (instance is ISystemFilter systemFilter)
{
systemFilter.filter = systemFilter.CreateFilter();
}
this.world.UpdateGroup(this);
return(true);
}
/// <summary>
/// Remove system manually
/// Pool will not be used, OnDeconstruct() call
/// </summary>
/// <param name="instance"></param>
public void RemoveSystem(ISystemBase instance)
{
if (this.world == null)
{
SystemGroupRegistryException.Throw();
}
var idx = this.systems.IndexOf(instance);
if (idx >= 0)
{
if (instance is ISystemFilter systemFilter)
{
systemFilter.filter = null;
}
instance.world = null;
this.systems = this.systems.RemoveAt(idx);
this.statesSystems = this.statesSystems.RemoveAt(idx);
instance.OnDeconstruct();
this.world.UpdateGroup(this);
}
}