/// <summary>
/// 存储shp对应的featuresource，可以将postgis原生featuresource转存为shapefile
/// </summary>
/// <param name="tablename"></param>
/// <returns></returns>
public Boolean SaveSHPFeatureSource(string tablename, string path, string filename)
{
if (this.featureSources.ContainsKey(tablename))
{
return(SHPGeoDataBase.SaveFeatureSource2File(this.featureSources[tablename], path, filename));
}
return(false);
}
//读取一个shapefile文件并将其中的第一个图层添加到当前SHPGeoDataBase
public override String AddFeatureSource(String path)
{
FeatureSource tmpSrc = SHPGeoDataBase.GetFeaturesource(this, path);
if (this.pathRef.ContainsKey(tmpSrc.schema.name))
{
return(null);
}
this.pathRef.Add(tmpSrc.schema.name, path);
this.featureSources.Add(tmpSrc.schema.name, tmpSrc);
return(tmpSrc.schema.name);
}
//给定路径，创建SHPGeoDataBase实例,并从数据库中读取所有图层的schema,必须不包含同名表，否则返回null
public static SHPGeoDataBase GetGeoDataBase(List <String> pathList)
{
SHPGeoDataBase resultDB = new SHPGeoDataBase();
foreach (String path in pathList)
{
FeatureSource tmpSrc = SHPGeoDataBase.GetFeaturesource(resultDB, path);
if (resultDB.pathRef.ContainsKey(tmpSrc.schema.name))
{
return(null);
}
resultDB.pathRef.Add(tmpSrc.schema.name, path);
resultDB.featureSources.Add(tmpSrc.schema.name, tmpSrc);
}
return(resultDB);
}
//get a ogr datasorce by path string
private static OSGeo.OGR.DataSource GetOGRDataSource(SHPGeoDataBase thisdb, String path)
{
OSGeo.OGR.Ogr.RegisterAll();
//to support chinese path
OSGeo.GDAL.Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES");
//to support chinese field name
OSGeo.GDAL.Gdal.SetConfigOption("SHAPE_ENCODING", "");
OSGeo.OGR.Driver dr = OSGeo.OGR.Ogr.GetDriverByName("ESRI shapefile");
if (dr == null)
{
return(null);
}
//第二参数为0表明只读模式
OSGeo.OGR.DataSource ds = dr.Open(path, 0);
thisdb.iDses.Add(path, ds);
return(ds);
}
/// <summary>
/// 给定shapefile的path，读取数据featuresource并加入到postgisgeodatabase中，返回该featuresource的表名字
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public string AddSHPFeatureSource(string path, string guid)
{
if (shpgeodb == null)
{
shpgeodb = SHPGeoDataBase.GetGeoDataBase(new List <string>());
}
string tablename = shpgeodb.AddFeatureSource(path);
if (this.featureSources.ContainsKey(tablename))
{
return(null);
}
var source = shpgeodb.featureSources[tablename];
source.schema.name = guid;
this.featureSources.Add(guid, source);
this.pathRef.Add(guid, guid);
return(tablename);
}
//从文件中读取数据
private static FeatureSource GetFeaturesource(SHPGeoDataBase thisdb, String path)
{
OSGeo.OGR.DataSource ds = GetOGRDataSource(thisdb, path);
//init schema
OSGeo.OGR.Layer layer = ds.GetLayerByIndex(0);
OSGeo.OGR.FeatureDefn fd = layer.GetLayerDefn();
Int32 sIndex = path.LastIndexOf("\\");
string sname = path.Substring(sIndex + 1, path.Length - sIndex - 1 - 4);
int fieldcount = fd.GetFieldCount();
Dictionary <String, FieldDefn> tmpField = new Dictionary <string, FieldDefn>();
for (int i = 0; i < fieldcount; ++i)
{
OSGeo.OGR.FieldDefn field = fd.GetFieldDefn(i);
tmpField.Add(field.GetName(), field);
}
GisSmartTools.RS.ReferenceSystem rfs;
OSGeo.OSR.SpatialReference osrrf = layer.GetSpatialRef();
if (osrrf.IsProjected() != 0)
{
rfs = new GisSmartTools.RS.SRS(osrrf);
}
else
{
rfs = new GisSmartTools.RS.GRS(osrrf);
}
Schema rs = new Schema(sname, layer.GetGeomType(), rfs, tmpField);
//get featurecollection
FeatureCollection fc = GetFeatureCollection(layer, rs);
//close file
//ds.Dispose();
return(new FeatureSource(rs, fc));
}
