jtulach@26: package api;
jtulach@26: 
jtulach@210: import java.util.ArrayList;
jtulach@26: import java.util.Collection;
jtulach@210: import java.util.Iterator;
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 2.0
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:             <T> Iterator<T> doLookup(Class<T> clazz) {
jtulach@210:                 ArrayList<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.iterator();
jtulach@210:             }
jtulach@210:         };
jtulach@26:     }
jtulach@26:     
jtulach@210:     public static Lookup dynamic(final Dynamic provider) {
jtulach@210:         return new Lookup() {
jtulach@210:             @Override
jtulach@210:             <T> Iterator<T> doLookup(Class<T> clazz) {
jtulach@210:                 ArrayList<T> result = new ArrayList<T>();
jtulach@210:                 provider.computeInstances(clazz, result);
jtulach@210:                 return result.iterator();
jtulach@210:             }
jtulach@210:         };
jtulach@26:     }
jtulach@26:     
jtulach@26:     public interface Dynamic {
jtulach@26:         public <T> void computeInstances(Class<T> requestedType, Collection<? super T> addInstancesTo);
jtulach@26:     }
jtulach@26: }