Package org.geotools.gml

Reads GML files and translates them into Java objects.

Note that the final OGC simple geometry types used by these classes are the ones developed by Vivid Solutions as part of the Java Topology Suite. However, this not the only type of Java object that may be generated by using this suite of filters. For example, you could implement a GMLGeometryHandler to create custom geometry types or to store OGC simple types in your own custom format. The illustration shows how this works.

GMLDocumentFilter reads in an arbitrary XML file, extracts all GML-namespace associate elements, and translates them into primitive geometry calls, handled by the GMLGeometryHandler. Essentially, GMLDocumentFilter handles all coordinate parsing so that handlers further down the chain never see any character data within GML objects.

GMLGeometryFilter implements a GMLGeometryHandler and uses the SubHandlers to create finished JTS-based geometries. This is the only object that GMLGeometryFilter passes on down the chain from the GML namespace. All other XML is passed through without modification.

Interface Summary

Interface	Description
GMLHandlerFeature	LEVEL4 saxGML4j GML handler: Gets features.
GMLHandlerGeometry	LEVEL2 saxGML4j GML handler: Gets basic alerts from GMLFilterDocument.
GMLHandlerJTS	LEVEL3 saxGML4j GML handler: Gets JTS objects.

Class Summary

Class	Description
GMLFilterDocument	LEVEL1 saxGML4j GML filter: Sends basic alerts for GML types to GMLFilterGeometry.
GMLFilterFeature	LEVEL3 GML filter: translates JTS elements and attribute data into features.
GMLFilterGeometry	LEVEL2 saxGML4j GML filter: translates coordinates and GML events into OGC simple types.
GMLReceiver
SubHandler	Specifies how a generic OGC simple geometry handler should behave.
SubHandlerBox	Creates a simple OGC box.
SubHandlerFactory	Creates the appropriate SubHandler element for a given OGC simple geometry type.
SubHandlerLinearRing	Creates a simple OGC LinearRing (a closed LineString).
SubHandlerLineString	Creates a simple OGC LineString element.
SubHandlerMulti	Creates a MultiPoint, MultiLineString, or MultiPolygon geometry as required by the internal functions.
SubHandlerPoint	Creates an OGC simple point.
SubHandlerPolygon	Creates a Polygon geometry.
TestHandler	Simple test implementation of GMLHandlerJTS.

Exception Summary

Exception	Description
GMLException	An exception used to represent any GML related errors.