gg_wfs.h File Reference

WFS support. More...

Go to the source code of this file.

Typedefs
typedef struct gaia_wfs_catalog	gaiaWFScatalog
typedef gaiaWFScatalog *	gaiaWFScatalogPtr
typedef struct gaia_wfs_item	gaiaWFSitem
typedef gaiaWFSitem *	gaiaWFSitemPtr
typedef struct gaia_wfs_schema	gaiaWFSschema
typedef gaiaWFSschema *	gaiaWFSschemaPtr
typedef struct gaia_wfs_column	gaiaWFScolumn
typedef gaiaWFScolumn *	gaiaWFScolumnPtr

Functions
SPATIALITE_DECLARE int	load_from_wfs (sqlite3 *sqlite, const char *path_or_url, const char *alt_describe_uri, const char *layer_name, int swap_axes, const char *table, const char *pk_column_name, int spatial_index, int *rows, char **err_msg, void(*progress_callback)(int, void *), void *callback_ptr)
	Loads data from some WFS source. More...
SPATIALITE_DECLARE int	load_from_wfs_paged (sqlite3 *sqlite, const char *path_or_url, const char *alt_describe_uri, const char *layer_name, int swap_axes, const char *table, const char *pk_column_name, int spatial_index, int page_size, int *rows, char **err_msg, void(*progress_callback)(int, void *), void *callback_ptr)
	Loads data from some WFS source (using WFS paging) More...
SPATIALITE_DECLARE gaiaWFScatalogPtr	create_wfs_catalog (const char *path_or_url, char **err_msg)
	Creates a Catalog for some WFS service. More...
SPATIALITE_DECLARE void	destroy_wfs_catalog (gaiaWFScatalogPtr handle)
	Destroys a WFS-Catalog object freeing any allocated resource. More...
SPATIALITE_DECLARE const char *	get_wfs_base_request_url (gaiaWFScatalogPtr handle)
	Return the base URL for any WFS-GetFeature call. More...
SPATIALITE_DECLARE const char *	get_wfs_base_describe_url (gaiaWFScatalogPtr handle)
	Return the base URL for any WFS-DescribeFeatureType call. More...
SPATIALITE_DECLARE char *	get_wfs_request_url (gaiaWFScatalogPtr handle, const char *name, const char *version, int srid, int max_features)
	Return a GetFeature URL (GET) More...
SPATIALITE_DECLARE char *	get_wfs_describe_url (gaiaWFScatalogPtr handle, const char *name, const char *version)
	Return a DescribeFeatureType URL (GET) More...
SPATIALITE_DECLARE int	get_wfs_catalog_count (gaiaWFScatalogPtr handle)
	Return the total count of items (aka Layers) defined within a WFS-Catalog object. More...
SPATIALITE_DECLARE gaiaWFSitemPtr	get_wfs_catalog_item (gaiaWFScatalogPtr handle, int index)
	Return the pointer to some specific Layer defined within a WFS-Catalog object. More...
SPATIALITE_DECLARE const char *	get_wfs_item_name (gaiaWFSitemPtr handle)
	Return the name corresponding to some WFS-Item (aka Layer) object. More...
SPATIALITE_DECLARE const char *	get_wfs_item_title (gaiaWFSitemPtr handle)
	Return the title corresponding to some WFS-Item (aka Layer) object. More...
SPATIALITE_DECLARE const char *	get_wfs_item_abstract (gaiaWFSitemPtr handle)
	Return the abstract corresponding to some WFS-Item (aka Layer) object. More...
SPATIALITE_DECLARE int	get_wfs_layer_srid_count (gaiaWFSitemPtr handle)
	Return the total count of SRIDs supported by a WFS-Item object. More...
SPATIALITE_DECLARE int	get_wfs_layer_srid (gaiaWFSitemPtr handle, int index)
	Return one of the SRIDs supported by a WFS-Item object. More...
SPATIALITE_DECLARE int	get_wfs_keyword_count (gaiaWFSitemPtr handle)
	Return the total count of Keywords associated to a WFS-Item object. More...
SPATIALITE_DECLARE const char *	get_wfs_keyword (gaiaWFSitemPtr handle, int index)
	Return one of the Keywords supported by a WFS-Item object. More...
SPATIALITE_DECLARE gaiaWFSschemaPtr	create_wfs_schema (const char *path_or_url, const char *layer_name, char **err_msg)
	Creates a Schema representing some WFS Layer. More...
SPATIALITE_DECLARE void	destroy_wfs_schema (gaiaWFSschemaPtr handle)
	Destroys a WFS-schema object freeing any allocated resource. More...
SPATIALITE_DECLARE int	get_wfs_schema_geometry_info (gaiaWFSschemaPtr handle, const char **name, int *type, int *srid, int *dims, int *nullable)
	Return the infos describing some WFS-GeometryColumn object. More...
SPATIALITE_DECLARE int	get_wfs_schema_column_count (gaiaWFSschemaPtr handle)
	Return the total count of items (aka Columns) defined within a WFS-Schema object. More...
SPATIALITE_DECLARE gaiaWFScolumnPtr	get_wfs_schema_column (gaiaWFSschemaPtr handle, int index)
	Return the pointer to some specific Column defined within a WFS-Schema object. More...
SPATIALITE_DECLARE int	get_wfs_schema_column_info (gaiaWFScolumnPtr handle, const char **name, int *type, int *nullable)
	Return the infos describing some WFS-Column object. More...
SPATIALITE_DECLARE void	reset_wfs_http_connection (void)
	Resets the libxml2 "nano HTTP": useful when changing the HTTP_PROXY settings. More...

Detailed Description

WFS support.

Function Documentation

SPATIALITE_DECLARE gaiaWFScatalogPtr create_wfs_catalog	(	const char *	path_or_url,
		char **	err_msg
	)

Creates a Catalog for some WFS service.

Parameters

path_or_url	pointer to some WFS-GetCapabilities XML Document (could be a pathname or an URL).
err_msg	on completion will contain an error message (if any)

Returns

the pointer to the corresponding WFS-Catalog object: NULL on failure

See Also

destroy_wfs_catalog, get_wfs_catalog_count, get_wfs_catalog_item, load_from_wfs, reset_wfs_http_connection

Note

an eventual error message returned via err_msg requires to be deallocated by invoking free().
you are responsible to destroy (before or after) any WFS-Catalog returned by create_wfs_catalog().

SPATIALITE_DECLARE gaiaWFSschemaPtr create_wfs_schema	(	const char *	path_or_url,
		const char *	layer_name,
		char **	err_msg
	)

Creates a Schema representing some WFS Layer.

Parameters

path_or_url	pointer to some WFS-DescribeFeatureType XML Document (could be a pathname or an URL).
err_msg	on completion will contain an error message (if any)

Returns

the pointer to the corresponding WFS-Schema object: NULL on failure

See Also

destroy_wfs_schema,get_wfs_schema_column_count, get_wfs_schema_column_info, get_wfs_schema_geometry_info

Note

an eventual error message returned via err_msg requires to be deallocated by invoking free().
you are responsible to destroy (before or after) any WFS-Schema returned by create_wfs_schema().

SPATIALITE_DECLARE void destroy_wfs_catalog

(

gaiaWFScatalogPtr

handle

)

Destroys a WFS-Catalog object freeing any allocated resource.

Parameters

handle

the pointer to a valid WFS-Catalog returned by a previous call to create_wfs_catalog()

See Also

create_wfs_catalog

SPATIALITE_DECLARE void destroy_wfs_schema

(

gaiaWFSschemaPtr

handle

)

Destroys a WFS-schema object freeing any allocated resource.

Parameters

handle

the pointer to a valid WFS-Catalog returned by a previous call to create_wfs_schema()

See Also

create_wfs_schema

SPATIALITE_DECLARE const char* get_wfs_base_describe_url

(

gaiaWFScatalogPtr

handle

)

Return the base URL for any WFS-DescribeFeatureType call.

Parameters

handle

the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().

Returns

the base URL for any WFS-DescribeFeatureType call: NULL is undefined

See Also

create_wfs_catalog, get_wfs_base_request_url, get_wfs_describe_url

SPATIALITE_DECLARE const char* get_wfs_base_request_url

(

gaiaWFScatalogPtr

handle

)

Return the base URL for any WFS-GetFeature call.

Parameters

handle

the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().

Returns

the base URL for any WFS-GetFeature call: NULL is undefined

See Also

create_wfs_catalog, get_wfs_base_describe_url, get_wfs_request_url

SPATIALITE_DECLARE int get_wfs_catalog_count

(

gaiaWFScatalogPtr

handle

)

Return the total count of items (aka Layers) defined within a WFS-Catalog object.

Parameters

handle

the pointer to a valid WFS-Catalog returned by a previous call to create_wfs_catalog()

Returns

the total count of items (aka Layers) defined within a WFS-Catalog object: a negative number if the WFS-Catalog isn't valid

See Also

create_wfs_catalog, get_wfs_catalog_item

SPATIALITE_DECLARE gaiaWFSitemPtr get_wfs_catalog_item	(	gaiaWFScatalogPtr	handle,
		int	index
	)

Return the pointer to some specific Layer defined within a WFS-Catalog object.

Parameters

handle	the pointer to a valid WFS-Catalog returned by a previous call to create_wfs_catalog()
index	the relative index identifying the required WFS-Layer (the first Item in the WFS-Catalaog object has index ZERO).

Returns

the pointer to the required WFS-Layer object: NULL if the passed index isn't valid

See Also

create_wfs_catalog, get_wfs_catalog_count, get_wfs_item_name, get_wfs_item_title, get_wfs_item_abstract, get_wfs_layer_srid_count, get_wfs_layer_srid, get_wfs_keyword_count, get_wfs_keyword

SPATIALITE_DECLARE char* get_wfs_describe_url	(	gaiaWFScatalogPtr	handle,
		const char *	name,
		const char *	version
	)

Return a DescribeFeatureType URL (GET)

Parameters

handle	the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().
name	the NAME uniquely identifying the required WFS layer.
version	could be "1.0.0" or "1.1.0"; if NULL or invalid "1.1.0" will be assumed.

Returns

the DescribeFeatureType URL: NULL if any error is found.

See Also

get_wfs_base_describe_url, get_wfs_request_url

Note

you are responsible to destroy (before or after) any allocated memory returned by get_wfs_describe_url().

SPATIALITE_DECLARE const char* get_wfs_item_abstract

(

gaiaWFSitemPtr

handle

)

Return the abstract corresponding to some WFS-Item (aka Layer) object.

Parameters

handle

the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().

Returns

the abstract corresponding to the WFS-Layer object

See Also

get_wfs_item_name, get_wfs_item_title, get_wfs_layer_srid_count, get_wfs_layer_srid, get_wfs_keyword_count, get_wfs_keyword

SPATIALITE_DECLARE const char* get_wfs_item_name

(

gaiaWFSitemPtr

handle

)

Return the name corresponding to some WFS-Item (aka Layer) object.

Parameters

handle

the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().

Returns

the name corresponding to the WFS-Layer object

See Also

get_wfs_layer_title, get_wfs_layer_abstract, get_wfs_layer_srid_count, get_wfs_layer_srid, get_wfs_keyword_count, get_wfs_keyword

SPATIALITE_DECLARE const char* get_wfs_item_title

(

gaiaWFSitemPtr

handle

)

Return the title corresponding to some WFS-Item (aka Layer) object.

Parameters

handle

the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().

Returns

the title corresponding to the WFS-Layer object

See Also

get_wfs_item_name, get_wfs_item_abstract, get_wfs_layer_srid_count, get_wfs_layer_srid, get_wfs_keyword_count, get_wfs_keyword

SPATIALITE_DECLARE const char* get_wfs_keyword	(	gaiaWFSitemPtr	handle,
		int	index
	)

Return one of the Keywords supported by a WFS-Item object.

Parameters

handle	the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().
index	the relative index identifying the required Keyword (the first Keyword associated to a WFS-Item object has index ZERO).

Returns

the Keyword value: NULL if the required Keyword isn't defined.

See Also

get_wfs_item_name, get_wfs_item_title, get_wfs_item_abstract, get_wfs_layer_srid_count, get_wfs_layer_srid, get_wfs_layer_keyword

SPATIALITE_DECLARE int get_wfs_keyword_count

(

gaiaWFSitemPtr

handle

)

Return the total count of Keywords associated to a WFS-Item object.

Parameters

handle

the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().

Returns

the total count of Keyword associated to a WFS-Item object: a negative number if the WFS-Item isn't valid

See Also

get_wfs_item_name, get_wfs_item_title, get_wfs_item_abstract, get_wfs_layer_srid_count, get_wfs_layer_srid, get_wfs_layer_keyword

SPATIALITE_DECLARE int get_wfs_layer_srid	(	gaiaWFSitemPtr	handle,
		int	index
	)

Return one of the SRIDs supported by a WFS-Item object.

Parameters

handle	the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().
index	the relative index identifying the required SRID (the first SRID value supported by a WFS-Item object has index ZERO).

Returns

the SRID-value: a negative number if the required SRID-value isn't defined.

See Also

get_wfs_item_name, get_wfs_item_title, get_wfs_item_abstract, get_wfs_layer_srid_count, get_wfs_keyword_count, get_wfs_keyword

SPATIALITE_DECLARE int get_wfs_layer_srid_count

(

gaiaWFSitemPtr

handle

)

Return the total count of SRIDs supported by a WFS-Item object.

Parameters

handle

the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().

Returns

the total count of SRIDs supported by a WFS-Item object: a negative number if the WFS-Item isn't valid

See Also

get_wfs_item_name, get_wfs_item_title, get_wfs_item_abstract, get_wfs_layer_srid, get_wfs_keyword_count, get_wfs_keyword

SPATIALITE_DECLARE char* get_wfs_request_url	(	gaiaWFScatalogPtr	handle,
		const char *	name,
		const char *	version,
		int	srid,
		int	max_features
	)

Return a GetFeature URL (GET)

Parameters

handle	the pointer to a valid WFS-Item returned by a previous call to get_wfs_catalog_item().
name	the NAME uniquely identifying the required WFS layer.
version	could be "1.0.0" or "1.1.0"; if NULL or invalid "1.1.0" will be assumed.
srid	the preferred SRS to be used for WFS geometries; if negative or mismatching will be simply ignored.
max_features	the WFS MAXFEATURES argument; any negative or zero value will be ignored.

Returns

the GetFeature URL: NULL if any error is found.

See Also

get_wfs_base_request_url, get_wfs_describe_url

Note

you are responsible to destroy (before or after) any allocated memory returned by get_wfs_request_url().

SPATIALITE_DECLARE gaiaWFScolumnPtr get_wfs_schema_column	(	gaiaWFSschemaPtr	handle,
		int	index
	)

Return the pointer to some specific Column defined within a WFS-Schema object.

Parameters

handle	the pointer to a valid WFS-Schema returned by a previous call to create_wfs_schema()
index	the relative index identifying the required WFS-Column (the first Item in the WFS-Schema object has index ZERO).

Returns

the pointer to the required WFS-Column object: NULL if the passed index isn't valid

See Also

create_wfs_schema, get_wfs_schema_geometry_info, get_wfs_schema_column_count, get_wfs_schema_column_info

SPATIALITE_DECLARE int get_wfs_schema_column_count

(

gaiaWFSschemaPtr

handle

)

Return the total count of items (aka Columns) defined within a WFS-Schema object.

Parameters

handle

the pointer to a valid WFS-Schema returned by a previous call to create_wfs_schema()

Returns

the total count of items (aka Columns) defined within a WFS-Schema object: a negative number if the WFS-Schema isn't valid

See Also

create_wfs_schema, get_wfs_schema_geometry_info, get_wfs_schema_column, get_wfs_schema_column_info

SPATIALITE_DECLARE int get_wfs_schema_column_info	(	gaiaWFScolumnPtr	handle,
		const char **	name,
		int *	type,
		int *	nullable
	)

Return the infos describing some WFS-Column object.

Parameters

handle	the pointer to a valid WFS-Column returned by a previous call to get_wfs_schema_column().
name	on completion will contain a pointer to the Column name
type	on completion will contain the datatype set for the Column; could be one of SQLITE_TEXT, SQLITE_INTEGER or SQLITE_FLOAT
nullable	on completion will contain a Boolean value; if TRUE the Column may contain NULL-values.

Returns

TRUE on success, FALSE if any error is encountered

See Also

get_wfs_schema_column, get_wfs_schema_geometry_info

SPATIALITE_DECLARE int get_wfs_schema_geometry_info	(	gaiaWFSschemaPtr	handle,
		const char **	name,
		int *	type,
		int *	srid,
		int *	dims,
		int *	nullable
	)

Return the infos describing some WFS-GeometryColumn object.

Parameters

handle	the pointer to a valid WFS-Schema returned by a previous call to create_wfs_schema().
name	on completion will contain a pointer to the GeometryColumn name
type	on completion will contain the GeometryType set for the Column; could be one of GAIA_POINT, GAIA_LINESTRING, GAIA_POLYGON, GAIA_MULTIPOINT, GAIA_MULTILINESTRING, GAIA_MULTIPOLYGON or GAIA_GEOMETRYCOLLECTION
srid	on completion will contain the SRID-value set for the GeometryColumn
dims	on completion will contain the dimensions (2 or 3) set for the GeometryColumn
nullable	on completion will contain a Boolean value; if TRUE the Column may contain NULL-values.

Returns

TRUE on success, FALSE if any error is encountered or if the WFS-Schema hasn't any Geometry-Column defined.

See Also

create_wfs_schema, get_wfs_schema_column_count, get_wfs_schema_column, get_wfs_schema_column_info

SPATIALITE_DECLARE int load_from_wfs	(	sqlite3 *	sqlite,
		const char *	path_or_url,
		const char *	alt_describe_uri,
		const char *	layer_name,
		int	swap_axes,
		const char *	table,
		const char *	pk_column_name,
		int	spatial_index,
		int *	rows,
		char **	err_msg,
		void(*)(int, void *)	progress_callback,
		void *	callback_ptr
	)

Loads data from some WFS source.

Parameters

sqlite	handle to current DB connection
path_or_url	pointer to some WFS-GetFeature XML Document (could be a pathname or an URL).
alt_describe_uri	an alternative URI for DescribeFeatureType to be used if no one is found within the XML document returned by GetFeature.
layer_name	the name of the WFS layer.
swap_axes	if TRUE the X and Y axes will be swapped
table	the name of the table to be created
pk_column	name of the Primary Key column; if NULL or mismatching then "PK_UID" will be assumed by default.
spatial_index	if TRUE an R*Tree Spatial Index will be created
rows	on completion will contain the total number of actually imported rows
err_msg	on completion will contain an error message (if any)
progress_callback	pointer to a callback function to be invoked immediately after processing each WFS page (could be NULL)
callback_ptr	an arbitrary pointer (to be passed as the second argument by the callback function).

See Also

create_wfs_catalog, load_from_wfs_paged, reset_wfs_http_connection

Returns

0 on failure, any other value on success

Note

an eventual error message returned via err_msg requires to be deallocated by invoking free()
please note: this one simply is a convenience method, and exactly corresponds to load_from_wfs_paged() setting a negative page size.

SPATIALITE_DECLARE int load_from_wfs_paged	(	sqlite3 *	sqlite,
		const char *	path_or_url,
		const char *	alt_describe_uri,
		const char *	layer_name,
		int	swap_axes,
		const char *	table,
		const char *	pk_column_name,
		int	spatial_index,
		int	page_size,
		int *	rows,
		char **	err_msg,
		void(*)(int, void *)	progress_callback,
		void *	callback_ptr
	)

Loads data from some WFS source (using WFS paging)

Parameters

sqlite	handle to current DB connection
path_or_url	pointer to some WFS-GetFeature XML Document (could be a pathname or an URL).
alt_describe_uri	an alternative URI for DescribeFeatureType to be used if no one is found within the XML document returned by GetFeature.
layer_name	the name of the WFS layer.
swap_axes	if TRUE the X and Y axes will be swapped
table	the name of the table to be created
pk_column	name of the Primary Key column; if NULL or mismatching then "PK_UID" will be assumed by default.
spatial_index	if TRUE an R*Tree Spatial Index will be created
page_size	max number of features for each single WFS call; if zero or negative a single monolithic page is assumed (i.e. paging will not be applied).
rows	on completion will contain the total number of actually imported rows
err_msg	on completion will contain an error message (if any)
progress_callback	pointer to a callback function to be invoked immediately after processing each WFS page (could be NULL)
callback_ptr	an arbitrary pointer (to be passed as the second argument by the callback function).

See Also

create_wfs_catalog, load_from_wfs, reset_wfs_http_connection

Returns

0 on failure, any other value on success

Note

an eventual error message returned via err_msg requires to be deallocated by invoking free()

the progress_callback function must have this signature: void myfunct(int count, void *ptr);
and will cyclically report how many features have been processed since the initial call start.

SPATIALITE_DECLARE void reset_wfs_http_connection

(

void

)

Resets the libxml2 "nano HTTP": useful when changing the HTTP_PROXY settings.

See Also

create_wfs_catalog, load_from_wfs, load_from_wfs_paged