jtulach@26: package api;
jtulach@26: 
jtulach@210: import java.util.ArrayList;
jtulach@26: import java.util.Collection;
jtulach@210: import java.util.HashSet;
jtulach@210: import java.util.List;
jtulach@26: import java.util.Set;
jtulach@26: 
jtulach@26: /** Factory to create various types of lookup instances.
jtulach@26:  *
jtulach@26:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jtulach@26:  * @version 1.0
jtulach@26:  */
jtulach@26: public final class Lookups {
jtulach@26:     private Lookups() {
jtulach@26:     }
jtulach@26:     
jtulach@210:     public static Lookup fixed(final Object... instances) {
jtulach@210:         return new Lookup() {
jtulach@210:             @Override
jtulach@210:             public <T> T lookup(Class<T> clazz) {
jtulach@210:                 for (Object obj : instances) {
jtulach@210:                     if (clazz.isInstance(obj)) {
jtulach@210:                         return clazz.cast(obj);
jtulach@210:                     }
jtulach@210:                 }
jtulach@210:                 return null;
jtulach@210:             }
jtulach@210: 
jtulach@210:             @Override
jtulach@210:             public <T> Collection<? extends T> lookupAll(Class<T> clazz) {
jtulach@210:                 List<T> result = new ArrayList<T>();
jtulach@210:                 for (Object obj : instances) {
jtulach@210:                     if (clazz.isInstance(obj)) {
jtulach@210:                         result.add(clazz.cast(obj));
jtulach@210:                     }
jtulach@210:                 }
jtulach@210:                 return result;
jtulach@210:             }
jtulach@210: 
jtulach@210:             @Override
jtulach@210:             public <T> Set<Class<? extends T>> lookupAllClasses(Class<T> clazz) {
jtulach@210:                 Set<Class<? extends T>> result = new HashSet<Class<? extends T>>();
jtulach@210:                 for (Object obj : instances) {
jtulach@210:                     if (clazz.isInstance(obj)) {
jtulach@210:                         result.add(obj.getClass().asSubclass(clazz));
jtulach@210:                     }
jtulach@210:                 }
jtulach@210:                 return result;
jtulach@210:             }
jtulach@210:         };
jtulach@26:     }
jtulach@26: }