public OnLineResource getOnlineResource() {
if (online == null) {
OnLineResourceImpl impl = new OnLineResourceImpl();
try {
impl.setLinkage(new URI(uri));
} catch (URISyntaxException e) {
throw new IllegalArgumentException(e);
}
online = impl;
}
return online;
}
private void styleFactoryExample() throws Exception {
// styleFactoryExample start
//
// We are using the GeoTools styleFactory that allows access to get/set methods
org.geotools.styling.StyleFactory sf = CommonFactoryFinder.getStyleFactory();
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2();
StyledLayerDescriptor sld = sf.createStyledLayerDescriptor();
sld.setName("sld");
sld.setTitle("Example");
sld.setAbstract("Example Style Layer Descriptor");
UserLayer layer = sf.createUserLayer();
layer.setName("layer");
//
// define constraint limited what features the sld applies to
FeatureTypeConstraint constraint =
sf.createFeatureTypeConstraint("Feature", Filter.INCLUDE, null);
layer.layerFeatureConstraints().add(constraint);
//
// create a "user defined" style
Style style = sf.createStyle();
style.setName("style");
style.getDescription().setTitle("User Style");
style.getDescription().setAbstract("Definition of Style");
//
// define feature type styles used to actually define how features are rendered
FeatureTypeStyle featureTypeStyle = sf.createFeatureTypeStyle();
// RULE 1
// first rule to draw cities
Rule rule1 = sf.createRule();
rule1.setName("rule1");
rule1.getDescription().setTitle("City");
rule1.getDescription().setAbstract("Rule for drawing cities");
rule1.setFilter(ff.less(ff.property("POPULATION"), ff.literal(50000)));
//
// create the graphical mark used to represent a city
Stroke stroke = sf.stroke(ff.literal("#000000"), null, null, null, null, null, null);
Fill fill = sf.fill(null, ff.literal(Color.BLUE), ff.literal(1.0));
// OnLineResource implemented by gt-metadata - so no factory!
OnLineResourceImpl svg = new OnLineResourceImpl(new URI("file:city.svg"));
svg.freeze(); // freeze to prevent modification at runtime
OnLineResourceImpl png = new OnLineResourceImpl(new URI("file:city.png"));
png.freeze(); // freeze to prevent modification at runtime
//
// List of symbols is considered in order with the rendering engine choosing
// the first one it can handle. Allowing for svg, png, mark order
List<GraphicalSymbol> symbols = new ArrayList<GraphicalSymbol>();
symbols.add(sf.externalGraphic(svg, "svg", null)); // svg preferred
symbols.add(sf.externalGraphic(png, "png", null)); // png preferred
symbols.add(sf.mark(ff.literal("circle"), fill, stroke)); // simple circle backup plan
Expression opacity = null; // use default
Expression size = ff.literal(10);
Expression rotation = null; // use default
AnchorPoint anchor = null; // use default
Displacement displacement = null; // use default
// define a point symbolizer of a small circle
Graphic city = sf.graphic(symbols, opacity, size, rotation, anchor, displacement);
PointSymbolizer pointSymbolizer =
sf.pointSymbolizer("point", ff.property("the_geom"), null, null, city);
rule1.symbolizers().add(pointSymbolizer);
featureTypeStyle.rules().add(rule1);
//
// RULE 2 Default
List<GraphicalSymbol> dotSymbols = new ArrayList<GraphicalSymbol>();
dotSymbols.add(sf.mark(ff.literal("circle"), null, null));
Graphic dotGraphic = sf.graphic(dotSymbols, null, ff.literal(3), null, null, null);
PointSymbolizer dotSymbolizer = sf.pointSymbolizer("dot", null, null, null, dotGraphic);
List<org.opengis.style.Symbolizer> symbolizers = new ArrayList<org.opengis.style.Symbolizer>();
symbolizers.add(dotSymbolizer);
Filter other = null; // null will mark this rule as "other" accepting all remaining features
Rule rule2 =
sf.rule("default", null, null, Double.MIN_VALUE, Double.MAX_VALUE, symbolizers, other);
featureTypeStyle.rules().add(rule2);
style.featureTypeStyles().add(featureTypeStyle);
layer.userStyles().add(style);
sld.layers().add(layer);
// styleFactoryExample end
}