public T AddUnique <T>(bool useExisted = true) where T : IComponent, IUnique, new()
{
int componentIndex = ComponentIndex <T> .FindIn(this.contextInfo);
Entity entity = GetSingleEntity(componentIndex);
if (entity != null)
{
if (!useExisted)
{
throw new EntityAlreadyHasComponentException(
componentIndex, "Cannot add component '" +
_contextInfo.componentNames[componentIndex] + "' to " + entity + "!",
"You should check if an entity already has the component."
);
}
return((T)ModifyUniqueComponent(componentIndex));
}
entity = CreateEntity(typeof(T).Name);
T component = entity.CreateComponent <T>(componentIndex);
entity.AddComponent(componentIndex, component);
return(component);
}
public T ModifyUnique <T>() where T : IComponent, IUnique
{
int componentIndex = ComponentIndex <T> .FindIn(this.contextInfo);
IComponent component = ModifyUniqueComponent(componentIndex);
if (component == null)
{
return(default(T));
}
return((T)component);
}
/// return unique entity with specified component
public Entity GetSingleEntity <T>() where T : IComponent, IUnique
{
return(GetSingleEntity(ComponentIndex <T> .FindIn(this.contextInfo)));
}