protected override byte[] LoadHgtDataFromFile(HgtCellCoords coords, string filePath)
{
using (var fileStream = File.Open(filePath,FileMode.Open,FileAccess.Read,FileShare.Read))
{
return LoadHgtDataFromStream(fileStream);
}
}
protected override async Task<byte[]> LoadHgtDataFromFileAsync(HgtCellCoords coords, string filePath)
{
using (var fileStream = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
return await LoadHgtDataFromStreamAsync(fileStream);
}
}
private IHgtDataCell buildCellFor(HgtCellCoords coords)
{
try
{
return _cellFactory.GetCellFor(coords);
}
catch (HgtFileException)
{
return HgtDataCellInvalid.Invalid;
}
}
protected override async Task<byte[]> LoadHgtDataFromFileAsync(HgtCellCoords coords, string filePath)
{
using (var zipArchive = ZipFile.OpenRead(filePath))
{
var entry = zipArchive.Entries.Single();
long length = entry.Length;
if (!HgtUtils.IsDataLengthValid(length))
throw new HgtFileInvalidException(coords, string.Format("Invalid length - {0} bytes", length));
using (var zipStream = entry.Open())
{
return await LoadHgtDataFromStreamAsync(zipStream);
}
}
}
private async Task<double> buildAndCacheCellAndReturnElevationAsync(HgtCellCoords coords, double latitude, double longitude)
{
IHgtDataCell ret;
try
{
ret = await _cellFactory.GetCellForAsync(coords);
}
catch (HgtFileException)
{
ret = HgtDataCellInvalid.Invalid;
}
var cell = _cache.GetOrAdd(coords, ret);
return await cell.GetElevationAsync(latitude, longitude);
}
public IHgtDataCell GetCellFor(HgtCellCoords coords)
{
var path = _pathResolver.FindFilePath(coords);
FileStream file = null;
try
{
int fileSize = (int)new FileInfo(path).Length;
file = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read);
return new HgtDataCellInFile(file, HgtUtils.PointsPerCellFromDataLength(fileSize), coords);
}
catch (Exception)
{
if (file != null) file.Dispose();
throw;
}
}
private string findPathForFile(HgtCellCoords coords)
{
string filename = coordsToFilename(coords);
string[] potentialPaths =
{
Path.Combine(_directory, filename),
Path.Combine(_directory, "Eurasia", filename),
Path.Combine(_directory, "Africa", filename),
Path.Combine(_directory, "South_America", filename),
Path.Combine(_directory, "North_America", filename),
Path.Combine(_directory, "Islands", filename),
};
var path = potentialPaths.FirstOrDefault(File.Exists);
if (path != null) return path;
var foundfile = new DirectoryInfo(_directory).EnumerateFiles(filename, SearchOption.AllDirectories)
.FirstOrDefault();
if (foundfile != null) return foundfile.FullName;
else throw new HgtFileNotFoundException(coords);
}
protected HgtDataCellBase(int pointsPerCell, HgtCellCoords coords)
{
_pointsPerCell = pointsPerCell;
_coords = coords;
}
protected abstract string coordsToFilename(HgtCellCoords coords);
public string FindFilePath(HgtCellCoords coords)
{
return _cache.GetOrAdd(coords, findPathForFile);
}
{
}
}
}
public HgtFileInvalidException(HgtCellCoords coords, string reason)
: base(coords, string.Format("Invalid file ({2}) for coordinates [{0}, {1}]", coords.Lat, coords.Lon, reason))
{
}
protected abstract Task<byte[]> LoadHgtDataFromFileAsync(HgtCellCoords coords, [NotNull] string filePath);
protected override string coordsToFilename(HgtCellCoords coords)
{
return coords.ToBaseName() + ".hgt";
}
internal HgtDataCellInFile([NotNull] FileStream file, int fileSize, HgtCellCoords coords)
: base(fileSize, coords)
{
_file = file;
}
public Task<IHgtDataCell> GetCellForAsync(HgtCellCoords coords)
{
return Task.FromResult(GetCellFor(coords));
}
public HgtFileNotFoundException(HgtCellCoords coords)
: base(coords, string.Format("Cannot find file for coordinates [{0}, {1}]", coords.Lat, coords.Lon))
{
}
protected HgtFileException(HgtCellCoords coords, [NotNull] string message)
: base(message)
{
_coords = coords;
}
public HgtFileException(HgtCellCoords coords, string message, Exception innerException)
: base(message, innerException)
{
_coords = coords;
}
public async Task<IHgtDataCell> GetCellForAsync(HgtCellCoords coords)
{
var data = await _loader.LoadFromFileAsync(coords);
return new HgtDataCellInMemory(data, HgtUtils.PointsPerCellFromDataLength(data.Length), coords);
}
public Task<byte[]> LoadFromFileAsync(HgtCellCoords coords)
{
var filePath = _pathResolver.FindFilePath(coords);
return LoadHgtDataFromFileAsync(coords, filePath);
}
public IHgtDataCell GetCellFor(HgtCellCoords coords)
{
var data = _loader.LoadFromFile(coords);
return new HgtDataCellInMemory(data, HgtUtils.PointsPerCellFromDataLength(data.Length), coords);
}
protected abstract byte[] LoadHgtDataFromFile(HgtCellCoords coords, [NotNull] string filePath);
internal HgtDataCellInMemory([NotNull] byte[] hgtData, int pointsPerCell, HgtCellCoords coords) : base(pointsPerCell, coords)
{
_hgtData = hgtData;
}
public byte[] LoadFromFile(HgtCellCoords coords)
{
var filePath = _pathResolver.FindFilePath(coords);
return LoadHgtDataFromFile(coords, filePath);
}
