org.geotools.renderer.style.svg

Class SVGGraphicFactory

Object

SVGGraphicFactory

All Implemented Interfaces:

ExternalGraphicFactory, GraphicCache, Factory

public class SVGGraphicFactory
extends Object
implements Factory, ExternalGraphicFactory, GraphicCache

External graphic factory accepting an Expression that can be evaluated to a URL pointing to a SVG file. The format must be image/svg+xml, thought for backwards compatibility image/svg-xml and image/svg are accepted as well.

Author:

Andrea Aime - TOPP

Constructor Summary

Constructors

Constructor and Description
SVGGraphicFactory()
SVGGraphicFactory(Map<RenderingHints.Key,Object> hints)

Method Summary

Modifier and Type	Method and Description
void	clearCache() Clear the graphic cache.
Icon	getIcon(Feature feature, Expression url, String format, int size) Turns the specified URL into an Icon, eventually using the Feature attributes to evaluate CQL expressions embedded in the url.
Map<RenderingHints.Key,?>	getImplementationHints() Map of hints (maybe unmodifiable) used by this factory to customize its use.
static void	resetCache() Forcefully drops the SVG cache
protected RenderableSVG	toRenderableSVG(String svgfile, URL svgUrl)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SVGGraphicFactory

public SVGGraphicFactory()

SVGGraphicFactory

public SVGGraphicFactory(Map<RenderingHints.Key,Object> hints)

Method Detail

getImplementationHints

public Map<RenderingHints.Key,?> getImplementationHints()

Description copied from interface: Factory

Map of hints (maybe unmodifiable) used by this factory to customize its use. This map is not guaranteed to contains all the hints supplied by the user; it may be only a subset. Consequently, hints provided here are usually not suitable for creating new factories, unless the implementation make some additional garantees.

The primary purpose of this method is to determine if an existing factory instance can be reused for a set of user-supplied hints. This method is invoked by FactoryRegistry in order to compare this factory's hints against user's hints. This is dependency introspection only; FactoryRegistry never invokes this method for creating new factories.

Keys are usually static constants from the Hints class, while values are instances of some key-dependent class. The key set must contains at least all hints impacting functionality. While the key set may contains all hints supplied by the user, it is recommended to limit the set to only the hints used by this particular factory instance. A minimal set will helps FactoryRegistry to compare only hints that matter and avoid the creation of unnecessary instances of this factory.

The hint values may be different than the one supplied by the user. If a user supplied a hint as a Class object, this method shall replace it by the actual instance used, if possible.

Implementations of this method are usually quite simple. For example if a datum authority factory uses an ordinary datum factory, its method could be implemented as below (note that we should not check if the datum factory is null, since key with null value is the expected behaviour in this case). Example:

 Map hints = new HashMap();
 hints.put(Hints.DATUM_FACTORY, datumFactory);
 return hints;
 

Specified by:

getImplementationHints in interface Factory

Returns:

The map of hints, or an empty map if none.

getIcon

public Icon getIcon(Feature feature,
                    Expression url,
                    String format,
                    int size)
             throws Exception

Description copied from interface: ExternalGraphicFactory

Turns the specified URL into an Icon, eventually using the Feature attributes to evaluate CQL expressions embedded in the url.
The size parameter defines the size of the image (so that vector based symbols can be drawn at the specified size directly), or may be zero or negative if the size was not specified (in that case the "natural" size of the image will be used, which is the size in pixels for raster images, and 16 for any format that does not have a specific size, according to the SLD spec).
null will be returned if this factory cannot handle the provided url.

Specified by:

getIcon in interface ExternalGraphicFactory

Throws:

Exception

toRenderableSVG

protected RenderableSVG toRenderableSVG(String svgfile,
                                        URL svgUrl)
                                 throws SAXException,
                                        IOException

Throws:

SAXException

IOException

resetCache

public static void resetCache()

Forcefully drops the SVG cache

clearCache

public void clearCache()

Description copied from interface: GraphicCache

Clear the graphic cache.

Specified by:

clearCache in interface GraphicCache