/// <inheritdoc/>
protected override NodeRecord CreateNodeRecord(NodeMetaData data)
{
var nodeRecord = new OctreeNodeRecord(data.Identifier,
new Bounds(data.BoundsCenter, data.BoundsSize), data.PointCount);
return(nodeRecord);
}
public static IndexData ReadFromFile(string filePath)
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException($"Index file under {filePath} not found.");
}
var size = new FileInfo(filePath).Length;
int treeType;
NodeMetaData[] data;
using (var mmf = MemoryMappedFile.CreateFromFile(filePath, FileMode.Open))
{
using (var accessor = mmf.CreateViewAccessor(0, size))
{
accessor.Read(0, out treeType);
accessor.Read(sizeof(int), out int itemCount);
data = new NodeMetaData[itemCount];
long pos = sizeof(int) * 2;
for (var i = 0; i < itemCount; ++i)
{
data[i] = NodeMetaData.Read(accessor, ref pos);
}
}
}
return(new IndexData((TreeType)treeType, data));
}
public static IndexData ReadFromFile(string filePath, long offset, long size)
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException($"Index file under {filePath} not found.");
}
int treeType;
NodeMetaData[] data;
using (var mmf = MemoryMappedFile.CreateFromFile(File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.Read), null, 0L, MemoryMappedFileAccess.Read, HandleInheritability.None, false))
{
using (var accessor = mmf.CreateViewAccessor(offset, size, MemoryMappedFileAccess.Read))
{
accessor.Read(0, out treeType);
accessor.Read(sizeof(int), out int itemCount);
data = new NodeMetaData[itemCount];
long pos = sizeof(int) * 2;
for (var i = 0; i < itemCount; ++i)
{
data[i] = NodeMetaData.Read(accessor, ref pos);
}
}
}
return(new IndexData((TreeType)treeType, data));
}
public IndexData(TreeType treeType, List <NodeRecord> records)
{
TreeType = treeType;
Data = new NodeMetaData[records.Count];
for (var i = 0; i < records.Count; ++i)
{
var record = records[i];
Data[i] = new NodeMetaData
{
Identifier = record.Identifier,
PointCount = record.PointCount,
BoundsCenter = record.Bounds.center,
BoundsSize = record.Bounds.size
};
}
}
public static NodeMetaData Read(MemoryMappedViewAccessor accessor, ref long position)
{
accessor.Read(position, out byte idLength);
position += sizeof(byte);
var idBytes = new byte[idLength];
accessor.ReadArray(position, idBytes, 0, idLength);
var identifier = Encoding.ASCII.GetString(idBytes);
position += idLength;
accessor.Read(position, out int pointCount);
position += sizeof(int);
accessor.Read(position, out float cX);
position += sizeof(float);
accessor.Read(position, out float cY);
position += sizeof(float);
accessor.Read(position, out float cZ);
position += sizeof(float);
accessor.Read(position, out float sX);
position += sizeof(float);
accessor.Read(position, out float sY);
position += sizeof(float);
accessor.Read(position, out float sZ);
position += sizeof(float);
var result = new NodeMetaData
{
Identifier = identifier,
PointCount = pointCount,
BoundsCenter = new Vector3(cX, cY, cZ),
BoundsSize = new Vector3(sX, sY, sZ)
};
return(result);
}
/// <summary> /// Creates and returns new node record associated with tree type. /// </summary> /// <param name="data">Metadata of the node.</param> protected abstract NodeRecord CreateNodeRecord(NodeMetaData data);
