Add support for OFSTJSON when fetching fields (#342)

Author: yeesian

src/ogr/feature.jl

@@ -515,6 +515,7 @@ const _FETCHFIELD = Dict{Union{OGRFieldType,OGRFieldSubType},Function}(
     OFSTBoolean => asbool,
     OFSTInt16 => asint16,
     OFSTFloat32 => assingle,
+    OFSTJSON => asstring,
 )
 
 """

test/test_feature.jl

@@ -244,6 +244,10 @@ end
                 AG.setsubtype!(fielddefn, AG.OFSTFloat32)
                 return AG.addfielddefn!(layer, fielddefn)
             end
+            AG.createfielddefn("jsonsubfield", AG.OFTString) do fielddefn
+                AG.setsubtype!(fielddefn, AG.OFSTJSON)
+                return AG.addfielddefn!(layer, fielddefn)
+            end
             AG.createfielddefn("uint1616subfield", AG.OFTInteger) do fielddefn
                 return AG.addfielddefn!(layer, fielddefn)
             end
@@ -255,6 +259,7 @@ end
                 return AG.addfielddefn!(layer, fielddefn)
             end
             AG.createfeature(layer) do feature
+                geojsonstring = "{ \"type\": \"Polygon\", \"coordinates\": [ [ [ 4, 44 ], [ 5, 44 ], [ 5, 45 ], [ 4, 45 ], [ 4, 44 ] ] ] }"
                 AG.setfield!(feature, 0, Int64(1))
                 AG.setfield!(feature, 1, Float64(1.0))
                 AG.setfield!(feature, 2, Int32[1, 2])
@@ -270,9 +275,10 @@ end
                 AG.setfield!(feature, 12, Int8(1))
                 AG.setfield!(feature, 13, Float32(1.0))
                 AG.setfield!(feature, 14, Float16(1.0))
-                AG.setfield!(feature, 15, UInt16(1.0))
-                AG.setfield!(feature, 16, UInt32(1.0))
-                AG.setfield!(feature, 17, EnumValue)
+                AG.setfield!(feature, 15, geojsonstring)
+                AG.setfield!(feature, 16, UInt16(1.0))
+                AG.setfield!(feature, 17, UInt32(1.0))
+                AG.setfield!(feature, 18, EnumValue)
                 for i in 1:AG.nfield(feature)
                     @test !AG.isfieldnull(feature, i - 1)
                     @test AG.isfieldsetandnotnull(feature, i - 1)
@@ -289,9 +295,10 @@ end
                 @test AG.getfield(feature, 12) === Int16(1) # Widened from Int8
                 @test AG.getfield(feature, 13) === Float32(1.0)
                 @test AG.getfield(feature, 14) === Float32(1.0) # Widened from Float16
-                @test AG.getfield(feature, 15) === Int32(1) # Widened from UInt16
-                @test AG.getfield(feature, 16) === Int64(1) # Widened from UInt32
-                @test AG.getfield(feature, 17) === false  # Enum is lost
+                @test AG.getfield(feature, 15) === geojsonstring
+                @test AG.getfield(feature, 16) === Int32(1) # Widened from UInt16
+                @test AG.getfield(feature, 17) === Int64(1) # Widened from UInt32
+                @test AG.getfield(feature, 18) === false  # Enum is lost
 
                 AG.addfeature(layer) do newfeature
                     AG.setfrom!(newfeature, feature)