/// <summary>
/// Deserializes the given block shape of data.
/// </summary>
/// <param name="stream"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <param name="decompress"></param>
/// <returns></returns>
internal CHBlockCoordinates DeserializeBlockShape(Stream stream, long offset, int length, bool decompress)
{
CHBlockCoordinates value = null;
if (decompress)
{ // decompress the data.
var buffer = new byte[length];
stream.Seek(offset, SeekOrigin.Begin);
stream.Read(buffer, 0, length);
var memoryStream = new MemoryStream(buffer);
var gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress);
value = (CHBlockCoordinates)_runtimeTypeModel.Deserialize(gZipStream, null, typeof(CHBlockCoordinates));
}
else
{
value = (CHBlockCoordinates)_runtimeTypeModel.Deserialize(
new CappedStream(stream, offset, length), null,
typeof(CHBlockCoordinates));
}
return(value);
}
/// <summary>
/// Does the v2 serialization.
/// </summary>
/// <param name="stream"></param>
/// <param name="graph"></param>
/// <returns></returns>
protected override void DoSerialize(LimitedStream stream,
DynamicGraphRouterDataSource <CHEdgeData> graph)
{
// sort the graph.
var sortedGraph = graph;
// create the regions.
var regions = new SortedDictionary <ulong, List <uint> >();
for (uint newVertexId = 1; newVertexId < sortedGraph.VertexCount + 1; newVertexId++)
{
// add to the CHRegions.
float latitude, longitude;
sortedGraph.GetVertex(newVertexId, out latitude, out longitude);
var tile = Tile.CreateAroundLocation(new GeoCoordinate(
latitude, longitude), _regionZoom);
List <uint> regionVertices;
if (!regions.TryGetValue(tile.Id, out regionVertices))
{
regionVertices = new List <uint>();
regions.Add(tile.Id, regionVertices);
}
regionVertices.Add(newVertexId);
}
// serialize the sorted graph.
// [START_OF_BLOCKS][START_OF_SHAPES][START_OF_REVERSE][START_OF_TAGS][[SIZE_OF_REGION_INDEX][REGION_INDEX][REGIONS]]
// [[SIZE_OF_BLOCK_INDEX][BLOCK_INDEX][BLOCKS]]
// [[SIZE_OF_SHAPE_INDEX][SHAPE_INDEX][SHAPES]]
// [[SIZE_OF_REVERSE_INDEX][REVERSE_INDEX][REVERSE]]
// [TAGS]
// START_OF_BLOCKS: 4bytes
// START_OF_SHAPES: 4bytes
// START_OF_STAGS: 4bytes
// START_OF_REVERSE 4bytes
// SIZE_OF_REGION_INDEX: 4bytes
// REGION_INDEX: see SIZE_OF_REGION_INDEX
// REGIONS: see START_OF_BLOCKS - 4bytes
// SIZE_OF_BLOCK_INDEX: 4bytes
// BLOCK_INDEX: see SIZE_OF_BLOCK_INDEX.
// BLOCKS: from START_OF_BLOCKS + 4bytes + SIZE_OF_BLOCKS_INDEX until END.
// serialize regions and build their index.
var chRegionIndex = new CHVertexRegionIndex();
chRegionIndex.LocationIndex = new int[regions.Count];
chRegionIndex.RegionIds = new ulong[regions.Count];
var memoryStream = new MemoryStream();
int regionIdx = 0;
foreach (var region in regions)
{
// serialize.
var chRegion = new CHVertexRegion();
chRegion.Vertices = region.Value.ToArray();
_runtimeTypeModel.Serialize(memoryStream, chRegion);
// set index.
chRegionIndex.LocationIndex[regionIdx] = (int)memoryStream.Position;
chRegionIndex.RegionIds[regionIdx] = region.Key;
regionIdx++;
}
stream.Seek(INDEX_SIZE, SeekOrigin.Begin); // move to beginning of [REGION_INDEX]
_runtimeTypeModel.Serialize(stream, chRegionIndex); // write region index.
var sizeRegionIndex = (int)(stream.Position - INDEX_SIZE); // now at beginning of [REGIONS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write regions.
memoryStream.Dispose();
var startOfBlocks = (int)stream.Position; // now at beginning of [SIZE_OF_BLOCK_INDEX]
// serialize the blocks and build their index.
memoryStream = new MemoryStream();
var blocks = new List <CHBlock>();
var blockLocations = new List <int>();
var blockShapeLocations = new List <int>();
var blockReverseLocations = new List <int>();
var blockShapes = new List <CHBlockCoordinates>();
var reverseNeighbours = new Dictionary <uint, List <uint> >();
uint vertexId = 1;
while (vertexId < sortedGraph.VertexCount + 1)
{
uint blockId = vertexId;
var blockArcs = new List <CHArc>();
var blockArcCoordinates = new List <CHArcCoordinates>();
var blockVertices = new List <CHVertex>();
while (vertexId < blockId + _blockVertexSize &&
vertexId < sortedGraph.VertexCount + 1)
{ // create this block.
var chVertex = new CHVertex();
float latitude, longitude;
sortedGraph.GetVertex(vertexId, out latitude, out longitude);
chVertex.Latitude = latitude;
chVertex.Longitude = longitude;
chVertex.ArcIndex = (ushort)(blockArcs.Count);
List <uint> reverse = null;
foreach (var sortedArc in sortedGraph.GetEdges(vertexId))
{
var chArc = new CHArc();
chArc.TargetId = sortedArc.Neighbour;
chArc.Meta = sortedArc.EdgeData.Meta;
chArc.Value = sortedArc.EdgeData.Value;
chArc.Weight = sortedArc.EdgeData.Weight;
blockArcs.Add(chArc);
var chArcCoordinates = new CHArcCoordinates();
chArcCoordinates.Coordinates = sortedArc.Intermediates.ToSimpleArray();
blockArcCoordinates.Add(chArcCoordinates);
if (sortedArc.EdgeData.RepresentsNeighbourRelations)
{
if (!reverseNeighbours.TryGetValue(sortedArc.Neighbour, out reverse))
{
reverse = new List <uint>();
reverseNeighbours[sortedArc.Neighbour] = reverse;
}
reverse.Add(vertexId);
}
}
chVertex.ArcCount = (ushort)(blockArcs.Count - chVertex.ArcIndex);
blockVertices.Add(chVertex);
vertexId++; // move to the next vertex.
}
// create block.
var block = new CHBlock();
block.Arcs = blockArcs.ToArray();
block.Vertices = blockVertices.ToArray(); // TODO: get rid of the list and create an array to begin with.
blocks.Add(block);
var blockCoordinates = new CHBlockCoordinates();
blockCoordinates.Arcs = blockArcCoordinates.ToArray();
// write blocks.
var blockStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockStream, block);
var compressed = GZipStream.CompressBuffer(blockStream.ToArray());
blockStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockLocations.Add((int)memoryStream.Position);
blockShapes.Add(blockCoordinates);
}
var blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockLocations.ToArray();
stream.Seek(startOfBlocks + 4, SeekOrigin.Begin); // move to beginning of [BLOCK_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write block index.
int sizeBlockIndex = (int)(stream.Position - (startOfBlocks + 4)); // now at beginning of [BLOCKS]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write blocks.
memoryStream.Dispose();
// write shapes and index.
memoryStream = new MemoryStream();
var startOfShapes = stream.Position;
foreach (var blockCoordinates in blockShapes)
{
// write shape blocks.
var blockShapeStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockShapeStream, blockCoordinates);
var compressed = GZipStream.CompressBuffer(blockShapeStream.ToArray());
blockShapeStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockShapeLocations.Add((int)memoryStream.Position);
}
blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockShapeLocations.ToArray();
stream.Seek(startOfShapes + 4, SeekOrigin.Begin); // move to beginning of [SHAPE_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write shape index.
int sizeShapeIndex = (int)(stream.Position - (startOfShapes + 4)); // now at beginning of [SHAPE]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write shapes.
memoryStream.Dispose();
// build reverse blocks.
var blockReverses = new List <CHBlockReverse>();
List <uint> storedReverses = null;
uint currentVertexId = 0;
for (int i = 0; i < blocks.Count; i++)
{
var blockReverse = new CHBlockReverse();
blockReverse.Vertices = new CHArcReverse[blocks[i].Vertices.Length];
for (int j = 0; j < blocks[i].Vertices.Length; j++)
{
currentVertexId++;
var blockReverseArc = new CHArcReverse();
blockReverseArc.Neighbours = new uint[0];
if (reverseNeighbours.TryGetValue(currentVertexId, out storedReverses))
{
blockReverseArc.Neighbours = storedReverses.ToArray();
}
blockReverse.Vertices[j] = blockReverseArc;
}
blockReverses.Add(blockReverse);
}
// write reverse and index.
memoryStream = new MemoryStream();
var startOfReverses = stream.Position;
foreach (var blockReverse in blockReverses)
{
// write reverse blocks.
var blockReverseStream = new MemoryStream();
_runtimeTypeModel.Serialize(blockReverseStream, blockReverse);
var compressed = GZipStream.CompressBuffer(blockReverseStream.ToArray());
blockReverseStream.Dispose();
memoryStream.Write(compressed, 0, compressed.Length);
blockReverseLocations.Add((int)memoryStream.Position);
}
blockIndex = new CHBlockIndex();
blockIndex.BlockLocationIndex = blockReverseLocations.ToArray();
stream.Seek(startOfReverses + 4, SeekOrigin.Begin); // move to beginning of [REVERSE_INDEX]
_runtimeTypeModel.Serialize(stream, blockIndex); // write reverse index.
int sizeReverseIndex = (int)(stream.Position - (startOfReverses + 4)); // now at beginning of [REVERSE]
memoryStream.Seek(0, SeekOrigin.Begin);
memoryStream.WriteTo(stream); // write reverses.
memoryStream.Dispose();
// write tags after reverses.
int tagsPosition = (int)stream.Position;
TagIndexSerializer.SerializeBlocks(stream, graph.TagsIndex, 10);
stream.Seek(startOfBlocks, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeBlockIndex), 0, 4); // write start position of blocks.
stream.Seek(startOfShapes, SeekOrigin.Begin); // move to [SIZE_OF_BLOCK_INDEX]
stream.Write(BitConverter.GetBytes(sizeShapeIndex), 0, 4); // write start position of blocks.
stream.Seek(startOfReverses, SeekOrigin.Begin); // move to [SIZE_OF_REVERSE_INDEX]
stream.Write(BitConverter.GetBytes(sizeReverseIndex), 0, 4); // write start position of blocks.
// write index.
stream.Seek(0, SeekOrigin.Begin); // move to beginning
stream.Write(BitConverter.GetBytes(startOfBlocks), 0, 4); // write start position of blocks.
stream.Write(BitConverter.GetBytes(startOfShapes), 0, 4); // write start position of shapes.
stream.Write(BitConverter.GetBytes(startOfReverses), 0, 4); // write start position of shapes.
stream.Write(BitConverter.GetBytes(tagsPosition), 0, 4);
stream.Write(BitConverter.GetBytes(sizeRegionIndex), 0, 4); // write size of region index.
stream.Flush();
}
