# OSGeo::FDO::Commands::SpatialContext::ISpatialContextReaderImp Class Reference
[OSGeo::FDO::Commands::SpatialContext]

Inheritance diagram for OSGeo::FDO::Commands::SpatialContext::ISpatialContextReaderImp:

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List of all members.

## Detailed Description

The ISpatialContextReaderImp class is a concrete implementation of ISpatialContextReader. The ISpatialContextReader interface provides forward-only, read-only functionality for enumerating spatial contexts. A reference to an ISpatialContextReader is returned from the GetSpatialContexts command. The initial position of the ISpatialContextReader interface is prior to the first item. Thus, you must call ReadNext to begin accessing any data.

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## Public Member Functions
System::String * | GetCoordinateSystem ()
| Gets the name of the coordinate system of the spatial context currently being read. If the result is a null or empty string, the coordinate system is unknown to the spatial context.
System::String * | GetCoordinateSystemWkt ()
| Gets the name of the coordinate system in OpenGIS SRS WKT format of the spatial context currently being read. If the result is an empty string, the coordinate system WKT description is not available.
System::String * | GetDescription ()
| Gets the description of the spatial context currently being read.
System::Byte | GetExtent ()[]
| Gets the extent of the spatial context currently being read as a byte array in FGF format.
OSGeo::FDO::Commands::SpatialContext::SpatialContextExtentType | GetExtentType ()
| Gets the extent type of the spatial context currently being read.
System::String * | GetName ()
| Gets the name of the spatial context currently being read.
System::Double | GetXYTolerance ()
| Gets the tolerance value for XY ordinates of the spatial context currently being read. Tolerances are used in some geometric tests, mostly for equality between coordinates. This occurs frequently in spatial queries, especially with "on boundary" or "just touching" conditions. It is also an objective amount that can be used when formulating step distances for parametric curve interpolation.
System::Double | GetZTolerance ()
| Gets the tolerance value for Z ordinates of the spatial context currently being read. Tolerances are used in some geometric tests, mostly for equality between coordinates. This occurs a frequently in spatial queries, especially with "on boundary" or "just touching" conditions. It is also an objective amount that can be used when formulating step distances for parametric curve interpolation.
System::Boolean | IsActive ()
| Returns true if the spatial context currently being read is the active spatial context.
System::Boolean | ReadNext ()
| Advances the reader to the next item. The default position of the reader is prior to the first item. Thus, you must call ReadNext to begin accessing any data.