protected DynamicRTree(SerializationInfo info, StreamingContext context)
{
byte[] data = (byte[])info.GetValue("data", typeof(byte[]));
MemoryStream buffer = new MemoryStream(data);
DynamicRTree tree = FromStream(buffer);
Root = tree.Root;
}
/// <summary>
/// Reads a node from a stream recursively
/// </summary>
/// <param name="tree">R-Tree instance</param>
/// <param name="br">Binary reader reference</param>
private static Node ReadNode(DynamicRTree tree, BinaryReader br)
{
if (br.BaseStream.Position == br.BaseStream.Length)
{
return(null);
}
Node node;
bool isLeaf = br.ReadBoolean();
if (isLeaf)
{
node = tree.CreateLeafNode();
}
else
{
node = tree.CreateIndexNode();
}
node.Box = new SharpMap.Converters.Geometries.BoundingBox(br.ReadDouble(), br.ReadDouble(), br.ReadDouble(), br.ReadDouble());
if (isLeaf)
{
LeafNode leaf = node as LeafNode;
int featureCount = br.ReadInt32();
for (int i = 0; i < featureCount; i++)
{
RTreeIndexEntry entry = new RTreeIndexEntry();
entry.Box = new SharpMap.Converters.Geometries.BoundingBox(br.ReadDouble(), br.ReadDouble(), br.ReadDouble(), br.ReadDouble());
entry.Id = br.ReadUInt32();
leaf.Add(entry);
}
}
else
{
IndexNode index = node as IndexNode;
uint childNodes = br.ReadUInt32();
for (int c = 0; c < childNodes; c++)
{
Node child = ReadNode(tree, br);
if (child != null)
{
index.Add(child);
}
}
}
return(node);
}
/// <summary>
/// Loads an R-Tree structure from a stream
/// </summary>
/// <param name="filename">Stream which holds the R-Tree spatial index</param>
/// <returns>A <see cref="DynamicRTree"/> instance which had been persisted to the <see cref="System.IO.Stream">stream</see>.</returns>
public static DynamicRTree FromStream(Stream data)
{
DynamicRTree tree = new DynamicRTree();
using (System.IO.BinaryReader br = new System.IO.BinaryReader(data))
{
System.Version fileVersion = new System.Version(br.ReadInt32(), br.ReadInt32(), br.ReadInt32(), br.ReadInt32());
if (fileVersion != IndexFileVersion) //Check fileindex version
{
throw new ObsoleteFileFormatException(IndexFileVersion, fileVersion, "Invalid index file version. Please rebuild the spatial index by deleting the index.");
}
tree.Root = ReadNode(tree, br);
}
return(tree);
}
