public byte[] GetBinary(int columnIndex, int rowIndex)
{
this.CheckColumn(columnIndex, ColumnType.Binary, null);
var(leaf, indexInLeaf) = this.GetFromBpTree(columnIndex, rowIndex);
var leafHeader = new RealmArrayHeader(leaf);
var isBig = leafHeader.ContextFlag;
byte[] value;
if (!isBig)
{
// 要素はすべて64バイト以下
// https://github.com/realm/realm-core/blob/v5.12.7/src/realm/column_binary.cpp#L31
value = new RealmArrayBinary(leaf)[indexInLeaf];
}
else
{
value = new RealmArrayBigBlobs(leaf)[indexInLeaf];
}
var nullable = this.Spec.GetColumn(columnIndex).Nullable;
return(value == null && !nullable ? new byte[0] : value);
}
public byte[] this[int index]
{
get
{
var blobRefValue = (ulong)this._array[index];
// 0 は null
if (blobRefValue == 0)
{
return(null);
}
var blobArrayRef = this.Ref.NewRef(blobRefValue);
var blobHeader = new RealmArrayHeader(blobArrayRef);
// ContextFlag、一体何者なんだ……？
// https://github.com/realm/realm-core/blob/v5.12.7/src/realm/array_blobs_big.hpp#L109
if (blobHeader.ContextFlag)
{
return(null);
}
var len = blobHeader.Size;
var data = new byte[len];
// ヘッダーの後 Size バイトが実際のデータ
blobArrayRef.ReadBytes(RealmArrayHeader.HeaderSize, data, 0, len);
return(data);
}
}
public string GetString(int columnIndex, int rowIndex)
{
var spec = this.Spec.GetColumn(columnIndex);
var nullable = spec.Nullable;
if (spec.Type == ColumnType.String)
{
var(leaf, indexInLeaf) = this.GetFromBpTree(columnIndex, rowIndex);
var leafHeader = new RealmArrayHeader(leaf);
var longStrings = leafHeader.HasRefs;
var isBig = leafHeader.ContextFlag;
string value;
if (!longStrings)
{
// 要素はすべて15バイト以下
// https://github.com/realm/realm-core/blob/v5.12.7/src/realm/column_string.cpp#L38-L39
value = new RealmArrayString(leaf, nullable)[indexInLeaf];
}
else if (!isBig)
{
// 要素はすべて63バイト以下
value = new RealmArrayStringLong(leaf, nullable)[indexInLeaf];
}
else
{
value = new RealmArrayBigBlobs(leaf).GetString(indexInLeaf);
}
return(value == null && !nullable ? "" : value);
}
else if (spec.Type == ColumnType.StringEnum)
{
// Table::optimize （各種言語バインディングからは未使用）で
// 半分以上の値が重複している String カラムを圧縮したときに誕生する
throw new NotImplementedException("StringEnum");
}
else
{
throw new InvalidOperationException($"このカラムの型は {spec.Type} です。");
}
}
public RealmArray(ReferenceAccessor @ref)
{
this.Ref = @ref;
this.Header = new RealmArrayHeader(@ref);
}
