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using System.Globalization;

using System.Threading;

using GeoAPI.Geometries;

using GeoAPI.Utilities;

namespace GeoAPI

{

public static class GeometryServicesExtensions

{

private static readonly ThreadSafeStore<string, IGeometryFactory> _store;

static GeometryServicesExtensions()

{

_store = new ThreadSafeStore<string, IGeometryFactory>( t => GeometryServiceProvider.Instance.CreateGeometryFactory(GetSrid(t)));

}

private static int _userSrid = 100000000;

private static int GetSrid(string oid)

{

if (string.IsNullOrEmpty(oid))

return GeometryServiceProvider.Instance.DefaultSRID;

int srid;

if (int.TryParse(oid, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out srid))

return srid;

Interlocked.Increment(ref _userSrid);

return _userSrid;

}

public static IGeometryFactory CreateGeometryFactory(this IGeometryServices self, string oid)

{

return _store.Get(oid);

}

}

}