static void Main(string[] args)
{
var fileName = args.Length > 0 ? args[0] : "default.realm";
using (var mmf = MemoryMappedFile.CreateFromFile(fileName, FileMode.Open, null, 0, MemoryMappedFileAccess.Read))
using (var accessor = mmf.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read))
{
var header = RealmFileHeader.ReadFrom(accessor);
Console.WriteLine("File Format Version: {0}", header.GetTopRef().FileFormatVersion);
// ファイル内では、 ref の値はそのまま使える（追加でアロケーションすると話は別）
var topArray = new RealmArray(new ReferenceAccessor(accessor, header.GetTopRef().Ref));
Console.WriteLine("Top Array Count: {0}", topArray.Count);
// HasRefs な Array に数値が入っているので、最下位ビットが 1 になっている
// ビットシフトで元の値が手に入る
Console.WriteLine("Logical File Size: {0}", (ulong)topArray[2] >> 1);
// 配列の 1 番目がテーブル名リスト
var tableNameArray = new RealmArrayString(new ReferenceAccessor(accessor, (ulong)topArray[0]), false);
// 2 番目がテーブルのリスト
var tableArray = new RealmArray(new ReferenceAccessor(accessor, (ulong)topArray[1]));
Console.WriteLine();
Console.WriteLine("Tables");
for (var i = 0; i < tableNameArray.Count; i++)
{
var table = new RealmTable(new ReferenceAccessor(accessor, (ulong)tableArray[i]));
Console.WriteLine(" - {0} (Count: {1})", tableNameArray[i], table.RowCount);
PrintTableSpec(table.Spec, tableNameArray, GetBacklinkTarget, 2);
}
Console.WriteLine();
Console.WriteLine("Contents");
for (var i = 0; i < tableNameArray.Count; i++)
{
var table = new RealmTable(new ReferenceAccessor(accessor, (ulong)tableArray[i]));
Console.WriteLine(" - {0} ({1}/{2})", tableNameArray[i], Math.Min(table.RowCount, PrintCount), table.RowCount);
PrintTableContent(table, GetBacklinkTarget, 2);
}
string GetBacklinkTarget(int tableIndex, int columnIndex)
{
var targetTable = new RealmTable(tableArray.Ref.NewRef((ulong)tableArray[tableIndex]));
var targetColumnName = targetTable.Spec.GetColumn(columnIndex).Name;
return(tableNameArray[tableIndex] + "." + targetColumnName);
}
Debugger.Break();
}
}
public TableSpec(ReferenceAccessor @ref)
{
this.Ref = @ref;
var specArray = new RealmArray(@ref);
this._types = new RealmArray(@ref.NewRef((ulong)specArray[0]));
this._names = new RealmArrayString(@ref.NewRef((ulong)specArray[1]), false);
this._attr = new RealmArray(@ref.NewRef((ulong)specArray[2]));
if (specArray.Count >= 4)
{
var subspecsRef = (ulong)specArray[3];
if (subspecsRef != 0)
{
this._subspecs = new RealmArray(@ref.NewRef(subspecsRef));
}
}
}
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。");
}
}
