/// <summary>
/// Creates ShapePageSet.Enumerator which can be used to cycle very large datasets.
/// </summary>
/// <param name="parent"></param>
public Enumerator(ShapeReader parent)
{
_source = parent._source;
_pageSize = parent.PageSize;
_envelope = parent.Envelope;
Reset();
}
/// <summary>
/// Update header extents from the geometries in a IShapeSource
/// </summary>
/// <param name="src"></param>
protected void UpdateExtents(IShapeSource src)
{
var sr = new ShapeReader(src);
Extent env = null;
foreach (var page in sr)
{
foreach (var shape in page)
{
Extent shapeExtent = shape.Value.Range.Extent;
if (env == null)
{
env = (Extent)shapeExtent.Clone();
}
else
{
env.ExpandToInclude(shapeExtent);
}
}
}
// Extents for an empty file are unspecified according to the specification, so do nothing
if (null == env)
{
return;
}
var sh = new ShapefileHeader(Filename);
sh.SetExtent(env);
sh.Save();
}
/// <summary>
/// Creates ShapePageSet.Enumerator which can be used to cycle very large datasets.
/// </summary>
/// <param name="parent"></param>
public Enumerator(ShapeReader parent)
{
_source = parent._source;
_count = -1;
_index = -1;
_pageSize = parent.PageSize;
_envelope = parent.Envelope;
}