public void Delete(IGISFeature feature)
{
if (feature == null)
throw new ArgumentNullException("feature", "A valid feature is required to be added.");
if (_features == null)
throw new NullReferenceException("Cannot delete feature from the InMemoryLayer. The internal list reference is NULL.");
InMemoryGISFeature mc = FindByKeyValue(_features, feature.Attributes.GetValue(KeyFieldName));
if (mc != null)
{
_features.Remove(mc);
}
}
public void Add(IGISFeature feature)
{
if (feature == null)
throw new ArgumentNullException("feature", "A valid feature is required to be added.");
if (_features == null)
throw new NullReferenceException("Cannot add feature to the InMemoryLayer. The internal list reference is NULL.");
if(FindByKeyValue(_features, feature.Attributes.GetValue(KeyFieldName)) != null)
throw new ArgumentException("Cannot add feature. A feature with the same key already exists.");
InMemoryGISFeature newFeature = CreateFeature();
_features.Add(newFeature);
newFeature.Shape = feature.Shape;
foreach (string key in feature.Attributes.GetKeys())
{
newFeature.Attributes.SetValue(key, feature.Attributes.GetValue(key));
}
}
public static void ReadGISFeature(IGISFeature feature, TextReader reader)
{
if (feature == null)
throw new ArgumentNullException("feature", "A valid feature reference is required.");
if (reader == null)
throw new ArgumentNullException("reader", "A valid reader object is required.");
JsonTextReader jreader = new JsonTextReader(reader);
ReadGISFeature(feature, jreader);
}
public static void ReadGISFeature(IGISFeature feature, JsonTextReader jreader)
{
if (feature == null)
throw new ArgumentNullException("feature", "A valid feature reference is required.");
if (jreader == null)
throw new ArgumentNullException("jreader", "A valid JSON reader object is required.");
if (jreader.MoveToContent() && jreader.TokenClass == JsonTokenClass.Object)
{
jreader.ReadToken(JsonTokenClass.Object);
//Read the 'Feature' as the type
jreader.ReadMember(); //reads 'type'
jreader.ReadString(); //reads 'Feature'
//Read the 'geometry'
jreader.ReadMember(); //reads 'geometry'
feature.Shape = Read(jreader); //reads the geometry value
//Read the 'properties'
jreader.ReadMember(); //reads 'properties'
ReadGISAttributes(feature.Attributes, jreader);
jreader.ReadToken(JsonTokenClass.EndObject);
}
}
public static void Write(IGISFeature feature, TextWriter writer)
{
if (feature == null)
return;
if (writer == null)
throw new ArgumentNullException("writer", "A valid text writer object is required.");
JsonTextWriter jwriter = new JsonTextWriter(writer);
Write(feature, jwriter);
}
public static void Write(IGISFeature feature, JsonTextWriter jwriter)
{
if (feature == null)
return;
if (jwriter == null)
throw new ArgumentNullException("jwriter", "A valid JSON writer object is required.");
jwriter.WriteStartObject();
jwriter.WriteMember("type");
jwriter.WriteString("Feature");
jwriter.WriteMember("geometry");
Write(feature.Shape, jwriter);
jwriter.WriteMember("properties");
Write(feature.Attributes, jwriter);
jwriter.WriteEndObject();
}
