package org.daisy.pipeline.braille.tex.impl;
   
   import java.net.URI;
   import java.util.Locale;
   
   import org.daisy.pipeline.braille.common.Provider;
   import static org.daisy.pipeline.braille.common.Provider.util.dispatch;
   import static org.daisy.pipeline.braille.common.Provider.util.memoize;
   import static org.daisy.pipeline.braille.common.Provider.util.varyLocale;
  import org.daisy.pipeline.braille.common.ResourceRegistry;
  
  import org.daisy.pipeline.braille.tex.TexHyphenatorTablePath;
  
  import org.osgi.service.component.annotations.Component;
  import org.osgi.service.component.annotations.Reference;
  import org.osgi.service.component.annotations.ReferenceCardinality;
  import org.osgi.service.component.annotations.ReferencePolicy;
  
  @Component(
  	name = "org.daisy.pipeline.braille.tex.impl.TexHyphenatorTableRegistry",
  	service = {
  		TexHyphenatorTableRegistry.class
  	}
  )
  public class TexHyphenatorTableRegistry extends ResourceRegistry<TexHyphenatorTablePath> implements Provider<Locale,URI> {
  	
  	@Reference(
  		name = "TexHyphenatorTablePath",
  		unbind = "-",
  		service = TexHyphenatorTablePath.class,
  		cardinality = ReferenceCardinality.MULTIPLE,
  		policy = ReferencePolicy.STATIC
  	)
  	protected void _register(TexHyphenatorTablePath path) {
  		register(path);
  		provider.invalidateCache();
  	}
  	
  	protected void _unregister (TexHyphenatorTablePath path) {
  		unregister(path);
  		provider.invalidateCache();
  	}
  	
  	/**
  	 * Try to find a table based on the given locale.
  	 * An automatic fallback mechanism is used: if nothing is found for
  	 * language-COUNTRY-variant, then language-COUNTRY is searched, then language.
  	 */
  	public Iterable<URI> get(Locale locale) {
  		return provider.get(locale);
  	}
  	
  	private final Provider.util.MemoizingProvider<Locale,URI> provider
  		= memoize(
  			varyLocale(
  				dispatch(paths.values())));
  	
  }