Able to get the reference amount in the `IHasPrimary` key proeprty.

[andy840119]

Found in the #2040 and #2057
We need to make sure that lyric should not be able to delete or split if the lyric is being referenced.

[andy840119]

Maybe should make something like IHasReferenceElement interface and should implement the method like QueryAllReference(ElementId id) for able to get all the reference.

Those interface should be implemented in the:

• KaraokeBeatmap
• Stage and stage element.
• Lyric
• Note

Also note that QueryAllReference() in the KaraokeBeatmap() should query the hit-object also.

[andy840119]

Not very sure but should worth to make a think:

• How to find the element ids that does not have the reference item(the item might be deleted.)

[andy840119]

Not very sure should save all referenced items inside the class that contains IHasPrimaryKey?
But might be hard to handle the event like undo or redo

[andy840119]

Or maybe return a big dictionary that has all the reference ids.

[andy840119]

Or maybe this interface sounds like IHasFilterTerms in the o!f?

We collect list of ids and find the matched ids from the big Collection<KeyValuePair<ElementId, IHasReferenceElement>>

[andy840119]

Maybe should use the attribute to mark all the properties that contains ElementId or IHasReferenceElement?
And write the algorithm together:
e.g.

var reference = ElementIdHelper.GetAllReference(beatmap);

or

var id = "abdcefd";
var reference = ElementIdHelper.GetAllReference(beatmap, id);

[andy840119]

另外有一個問題需要想一下
目前 lyric/note 已經有 working property 的機制，會不會讓這兩邊有重複的邏輯?

或是說能不能根據 id 和 type 去搜尋所有 matched 的 instance?

[andy840119]

還有一個問題需要想一下
reference amount 應該要抓到正確的參考才對
e.g. lyric singer ids 如果 element id 是 lyric 的 ID，就會有抓錯的問題。

[andy840119]

maybe reference 是參考哪個 property 內的哪個 property, like:

public class Lyric
{
  [ReferenceProperty(namepf(Lyric))]
  public ElementId? ReferenceLyricId {get;set;}
}

但可能會有一些問題:

1. ReferenceLyricId 是從哪邊過來(e.g. beatmap.hitObjects) 的定義並不明確。如果未來多個地方都可以存放 lyric，會有參考問題
2. 有點過度設計，會和 beatmap processor 內做的事情很像

如果換成另外一種想法，把 karaoke beatmap 當作是一個資料庫，這些東西是 table:

• Singer (And Singer state)
• Lyric
• StageElement
• ClassicLyricTimingPoint

那做的東西就會是單純的從 table 上面提取資料。
可能只需要定義哪些物件 table (e.g. StageCategory, ClassicStageInfo, SingerInfo, KaraokeBeatmap or IBeatmap)
並且可以從裡面拿到哪種型態的 row?

[andy840119]

Not very sure but seems we can use source generator to deal with that?