Description Noel Grandin 2005-12-06 07:01:39 EST

package noel.bugs;

import java.util.HashMap;
import java.util.Map;

/**
 * Without the cast on the relevant line, the SUN compiler (JDK1.5.0_06) will flag an error.
 * 
 * With the cast, Eclipse issues a warning that the cast is unnecessary. But as far as I can
 * tell, the cast really is necessary.
 */
public class EclipseGenericsBug {

	public static class DatabaseObject {
	}
	
	public static class ObjectFormUI<T extends DatabaseObject>  {
	}
	
	private static final Map<Class<? extends DatabaseObject>, Class<? extends ObjectFormUI>> uiMap 
		= new HashMap<Class<? extends DatabaseObject>, Class<? extends ObjectFormUI>>();
	
	private EclipseGenericsBug() {
	}
	
	public static <T extends DatabaseObject> Class<? extends ObjectFormUI<T>> getUI(Class<T> persistentClass) {
		// >>>>>> THIS LINE IS THE CRITICAL ONE <<<<<<<
		return (Class<? extends ObjectFormUI<T>>) uiMap.get(persistentClass);
		// >>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<
	}

}