module OGR::LayerMixins::CapabilityMethods
Helper methods for checking what the Layer
is capable of.
Public Instance Methods
@return [Boolean] true
if the Layer
supports altering the defintition
of an existing field on the current layer.
# File lib/ogr/extensions/layer/capability_methods.rb, line 77 def can_alter_field_definition? test_capability("AlterFieldDefn") end
@return [Boolean] true
if new Fields can be created on this Layer
.
# File lib/ogr/extensions/layer/capability_methods.rb, line 53 def can_create_field? test_capability("CreateField") end
@return [Boolean] true
if the Layer
supports creating new geometry
fields on the current layer.
# File lib/ogr/extensions/layer/capability_methods.rb, line 59 def can_create_geometry_field? test_capability("CreateGeomField") end
@return [Boolean] true
if the Layer
supports deleting Features.
# File lib/ogr/extensions/layer/capability_methods.rb, line 82 def can_delete_feature? test_capability("DeleteFeature") end
@return [Boolean] true
if the Layer
supports deleting existing fields
on the current layer.
# File lib/ogr/extensions/layer/capability_methods.rb, line 65 def can_delete_field? test_capability("DeleteField") end
@return [Boolean] true
if this layer can return a feature count
efficiently (i.e. without counting all of the features).
# File lib/ogr/extensions/layer/capability_methods.rb, line 36 def can_fast_feature_count? test_capability("FastFeatureCount") end
@return [Boolean] true
if this Layer
can return its extent
efficiently (i.e. without scanning all of the features.).
# File lib/ogr/extensions/layer/capability_methods.rb, line 42 def can_fast_get_extent? test_capability("FastGetExtent") end
@return [Boolean] true
if this layer can perform the
#next_feature_index= call efficiently.
# File lib/ogr/extensions/layer/capability_methods.rb, line 48 def can_fast_set_next_by_index? test_capability("FastSetNextByIndex") end
@return [Boolean] true
if this layer implements spatial filtering
efficiently. This can be used as a clue by the application whether it should build and maintain its own spatial index for features in this layer.
# File lib/ogr/extensions/layer/capability_methods.rb, line 30 def can_fast_spatial_filter? test_capability("FastSpatialFilter") end
@return [Boolean] true
if feature() is implemented in an optimized
manner for this layer (as opposed to using #next_feature and #reset_reading).
# File lib/ogr/extensions/layer/capability_methods.rb, line 12 def can_random_read? test_capability("RandomRead") end
@return [Boolean] true
if feature= is allowed on this layer.
# File lib/ogr/extensions/layer/capability_methods.rb, line 22 def can_random_write? test_capability("RandomWrite") end
@return [Boolean] true
if the Layer
supports reording fields on the
current layer.
# File lib/ogr/extensions/layer/capability_methods.rb, line 71 def can_reorder_fields? test_capability("ReorderFields") end
@return [Boolean] true
if create_feature is allowed on this layer.
# File lib/ogr/extensions/layer/capability_methods.rb, line 17 def can_sequential_write? test_capability("SequentialWrite") end
@return [Boolean] true
if :OFTString fields are guaranteed to be in
UTF-8.
# File lib/ogr/extensions/layer/capability_methods.rb, line 88 def strings_are_utf_8? test_capability("StringsAsUTF8") end
@return [Boolean] true
if this Layer
supports reading or writing
curve geometries.
# File lib/ogr/extensions/layer/capability_methods.rb, line 101 def supports_curve_geometries? test_capability("CurveGeometries") end
@return [Boolean] true
if this Layer
supports transactions. If not,
#start_transaction, #commit_transaction, and #rollback_transaction will not work in a meaningful manner.
# File lib/ogr/extensions/layer/capability_methods.rb, line 95 def supports_transactions? test_capability("Transactions") end