/// <summary>
/// Creates a new <see cref="WKBHexFileReader"/> given the
/// <see cref="WKBReader"/> to use to parse the geometries.
/// </summary>
/// <param name="wkbReader">The geometry reader to use</param>
public WKBHexFileReader(WKBReader wkbReader)
{
if (wkbReader == null)
{
throw new ArgumentNullException("wkbReader");
}
Limit = -1;
_wkbReader = wkbReader;
}
/// <summary>
/// Reads a sequence of geometries.<br/>
/// If an <see cref="Offset"/> is specified, geometries read up to the offset count are skipped.
/// If a <see cref="Limit"/> is specified, no more than <see cref="Limit"/> geometries are read.
/// </summary>
/// <param name="streamReader">The stream reader to use.</param>
/// <exception cref="IOException">Thrown if an I/O exception was encountered</exception>
/// <exception cref="ParseException">Thrown if an error occured reading a geometry</exception>
private ReadOnlyCollection <Geometry> Read(StreamReader streamReader)
{
var geoms = new List <Geometry>();
int count = 0;
while (!IsAtEndOfFile(streamReader) && !IsAtLimit(geoms))
{
string line = streamReader.ReadLine();
if (string.IsNullOrEmpty(line))
{
continue;
}
var g = _wkbReader.Read(WKBReader.HexToBytes(line));
if (count >= Offset)
{
geoms.Add(g);
}
count++;
}
return(geoms.AsReadOnly());
}