/// <summary>
/// Get the component instance of the given component type for the given entity.
/// </summary>
/// <param name="entity">The entity for which you want to get the component</param>
/// <param name="componentType">The desired component type</param>
/// <returns>Component instance</returns>
internal IEntityComponent GetComponent(Entity entity, ComponentType componentType)
{
Debug.Assert(entity != null, "Entity must not be null.");
Debug.Assert(componentType != null, "Component type must not be null.");
if (componentType.Id >= this.componentsByType.Capacity)
{
return(null);
}
int entityId = entity.Index;
Bag <IEntityComponent> bag = this.componentsByType.Get(componentType.Id);
if (bag != null &&
entityId < bag.Capacity)
{
return(bag.Get(entityId));
}
return(null);
}
/// <summary>
/// Get all components assigned to an entity.
/// </summary>
/// <param name="entity">Entity for which you want the components.</param>
/// <returns>Bag of components</returns>
public Bag <IEntityComponent> GetComponents(Entity entity)
{
Debug.Assert(entity != null, "Entity must not be null.");
//Debug.Assert(entity.entityManager == this, ""); // TODO
Bag <IEntityComponent> entityComponents = new Bag <IEntityComponent>();
int entityId = entity.Index;
for (int index = 0, b = this.componentsByType.Count; b > index; ++index)
{
Bag <IEntityComponent> components = this.componentsByType.Get(index);
if (components != null &&
entityId < components.Count)
{
IEntityComponent component = components.Get(entityId);
if (component != null)
{
entityComponents.Add(component);
}
}
}
return(entityComponents);
}