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cdiggins/IfcPropertyDataReader.cs

Created July 29, 2024 19:02
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NarwhalDB PoC for IFC Property Database
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IfcPropertyDataReader.cs
using Ara3D.Buffers;
using Ara3D.Collections;
using Ara3D.NarwhalDB;
namespace Ara3D.IfcParser;
public class IfcPropertyDataReader
{
public IfcPropertyDataReader(IReadOnlyList<ByteSpanBuffer> buffers)
{
LoadTable(out PropSetToValTable, buffers);
LoadTable(out PropSetEntityToIndexTable, buffers);
LoadTable(out PropDescTable, buffers);
LoadTable(out PropSetTable, buffers);
LoadTable(out PropValTable, buffers);
var stringsBuffer = buffers.Single(b => b.Name == "_STRINGS_");
var unpackedStrings = stringsBuffer.Span.UnpackStrings().ToIArray();
// The conversion to an actual string, happens as late as possible.
// However: I eventually want even more usage of "ByteSpan" throughout.
Strings = unpackedStrings.Select(bs => bs.ToString());
}
public static void LoadTable<T>(out TypedSpan<T> span, IEnumerable<ByteSpanBuffer> buffers) where T: unmanaged
{
var name = typeof(T).Name;
var buffer = buffers.FirstOrDefault(b => b.Name == name);
if (buffer == null) throw new Exception($"Table {name} could not be found");
span = new TypedSpan<T>(buffer.Span);
}
public TypedSpan<PropSetToVal> PropSetToValTable;
public TypedSpan<PropSetEntityToIndex> PropSetEntityToIndexTable;
public TypedSpan<PropDesc> PropDescTable;
public TypedSpan<PropSet> PropSetTable;
public TypedSpan<PropVal> PropValTable;
public IArray<string> Strings;
public struct PropSetToVal
{
public int PropSetIndex;
public int PropValIndex;
public PropSet GetPropSet(IArray<PropSet> xs) => xs[PropSetIndex];
public PropVal GetPropVal(IArray<PropVal> xs) => xs[PropValIndex];
}
public struct PropSetEntityToIndex
{
public int PropSetEntity;
public int PropSetIndex;
public int FilePathStringIndex;
public PropSet GetPropSet(IArray<PropSet> xs) => xs[PropSetIndex];
public string GetFilePath(IArray<string> strings) => strings[FilePathStringIndex];
}
public struct PropDesc
{
public int NameStringIndex;
public int DescriptionStringIndex;
public int UnitStringIndex;
public int EntityStringIndex;
public string GetName(IArray<string> strings) => strings[NameStringIndex];
public string GetDescription(IArray<string> strings) => strings[DescriptionStringIndex];
public string GetUnit(IArray<string> strings) => strings[UnitStringIndex];
public string GetEntity(IArray<string> strings) => strings[EntityStringIndex];
}
public struct PropSet
{
public int NameStringIndex;
public int DescriptionStringIndex;
public string GetName(IArray<string> strings) => strings[NameStringIndex];
public string GetDescriptions(IArray<string> strings) => strings[DescriptionStringIndex];
}
public struct PropVal
{
public int ValueStringIndex;
public int PropDescIndex;
public string GetValue(IArray<string> strings) => strings[ValueStringIndex];
public PropDesc GetDescriptor(IArray<PropDesc> xs) => xs[PropDescIndex];
}
}
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