/// <summary>
/// This create new method implies that this provider has the priority for creating a new file.
/// An instance of the dataset should be created and then returned. By this time, the filename
/// will already be checked to see if it exists, and deleted if the user wants to overwrite it.
/// </summary>
/// <param name="filename">The string filename for the new instance</param>
/// <param name="featureType">Point, Line, Polygon etc. Sometimes this will be specified, sometimes it will be "Unspecified"</param>
/// <param name="inRam">Boolean, true if the dataset should attempt to store data entirely in ram</param>
/// <param name="progressHandler">An IProgressHandler for status messages.</param>
/// <returns>An IRaster</returns>
public virtual IFeatureSet CreateNew(string filename, FeatureTypes featureType, bool inRam, IProgressHandler progressHandler)
{
if (featureType == FeatureTypes.Point)
{
PointShapefile ps = new PointShapefile();
ps.Filename = filename;
return ps;
}
else if (featureType == FeatureTypes.Line)
{
LineShapefile ls = new LineShapefile();
ls.Filename = filename;
return ls;
}
else if (featureType == FeatureTypes.Polygon)
{
PolygonShapefile ps = new PolygonShapefile();
ps.Filename = filename;
return ps;
}
else if (featureType == FeatureTypes.MultiPoint)
{
MultiPointShapefile mps = new MultiPointShapefile();
mps.Filename = filename;
return mps;
}
return null;
}
/// <summary>
/// This will return the correct shapefile type by reading the filename.
/// </summary>
/// <param name="filename">A string specifying the file with the extension .shp to open.</param>
/// <param name="progressHandler">recieves progress messages and overrides the ProgressHandler on the DataManager.DefaultDataManager</param>
/// <returns>A correct shapefile object which is exclusively for reading the .shp data</returns>
public new static Shapefile OpenFile(string filename, IProgressHandler progressHandler)
{
ShapefileHeader head = new ShapefileHeader();
head.Open(filename);
PointShapefile psf;
LineShapefile lsf;
PolygonShapefile pgsf;
MultiPointShapefile mpsf;
switch (head.ShapeType)
{
case ShapeTypes.MultiPatch:
throw new NotImplementedException("This shape type is not yet supported.");
// break;
case ShapeTypes.MultiPoint:
mpsf = new MultiPointShapefile();
mpsf.Open(filename, progressHandler);
return mpsf;
case ShapeTypes.MultiPointM:
mpsf = new MultiPointShapefile();
mpsf.Open(filename, progressHandler);
return mpsf;
case ShapeTypes.MultiPointZ:
mpsf = new MultiPointShapefile();
mpsf.Open(filename, progressHandler);
return mpsf;
case ShapeTypes.NullShape:
throw new NotImplementedException("This shape type is not yet supported.");
// break;
case ShapeTypes.Point:
// Instantiate a new object to handle the point shapefile
psf = new PointShapefile();
// Open the geometric components of the data (but not the dbf components)
psf.Open(filename, progressHandler);
return psf;
case ShapeTypes.PointM:
// Instantiate a new object to handle the point shapefile
psf = new PointShapefile();
// Open the geometric components of the data (but not the dbf components)
psf.Open(filename, progressHandler);
return psf;
case ShapeTypes.PointZ:
// Instantiate a new object to handle the point shapefile
psf = new PointShapefile();
// Open the geometric components of the data (but not the dbf components)
psf.Open(filename, progressHandler);
return psf;
case ShapeTypes.Polygon:
pgsf = new PolygonShapefile();
pgsf.Open(filename, progressHandler);
return pgsf;
case ShapeTypes.PolygonM:
pgsf = new PolygonShapefile();
pgsf.Open(filename, progressHandler);
return pgsf;
case ShapeTypes.PolygonZ:
pgsf = new PolygonShapefile();
pgsf.Open(filename, progressHandler);
return pgsf;
case ShapeTypes.PolyLine:
lsf = new LineShapefile();
lsf.Open(filename, progressHandler);
return lsf;
case ShapeTypes.PolyLineM:
lsf = new LineShapefile();
lsf.Open(filename, progressHandler);
return lsf;
case ShapeTypes.PolyLineZ:
lsf = new LineShapefile();
lsf.Open(filename, progressHandler);
return lsf;
}
return null;
}