package org.geotools.tutorial.function;
import java.util.Iterator;
import java.util.Set;
import org.geotools.factory.FactoryCreator;
import org.geotools.factory.FactoryFinder;
import org.geotools.factory.FactoryRegistry;
import org.geotools.factory.GeoTools;
import org.geotools.factory.Hints;
import org.geotools.filter.FunctionFactory;
import org.geotools.resources.LazySet;
import org.opengis.filter.FilterFactory;
public class ExampleFinder extends FactoryFinder {
private static FactoryCreator registry;
private static FactoryRegistry getServiceRegistry() {
assert Thread.holdsLock(ExampleFinder.class);
if (registry == null) {
Class<?> categories[] = new Class<?>[] { FunctionFactory.class };
registry = new FactoryCreator( categories);
}
return registry;
}
/**
* Returns a set of all available implementations for the {@link FilterFactory} interface.
*
* @param hints An optional map of hints, or {@code null} if none.
* @return Set of available filter factory implementations.
*/
public static synchronized Set<FunctionFactory> getFilterFactories(Hints hints) {
hints = mergeSystemHints(hints);
Iterator<FunctionFactory> serviceProviders = getServiceRegistry().getServiceProviders(
FunctionFactory.class, null, hints);
return new LazySet<FunctionFactory>(serviceProviders);
}
/** Allow the classpath to be rescanned */
public static synchronized void scanForPlugins() {
if (registry != null) {
registry.scanForPlugins();
}
}
}