| 1 | package com.hammurapi.eventbus; |
| 2 | |
| 3 | import java.io.Serializable; |
| 4 | import java.util.Arrays; |
| 5 | |
| 6 | import com.hammurapi.eventbus.AbstractEventBus.Handle; |
| 7 | import com.hammurapi.extract.Predicate; |
| 8 | |
| 9 | /** |
| 10 | * Handler which maps input tuples like {{E1, E2, E5}, {E4, E3}} to {E1, E2, E3, E4, E5} |
| 11 | * @author Pavel Vlasov |
| 12 | * |
| 13 | * @param <E> |
| 14 | * @param <P> |
| 15 | * @param <C> |
| 16 | */ |
| 17 | public class MappingEventHandler<E, P extends Comparable<P>, C, K, H extends EventBus.Handle<E, P, C>, S extends EventStore<E,P,C,H,S>> implements JoinEventHandler<E, P, C, K, H, S>, Serializable { |
| 18 | |
| 19 | private EventHandlerWrapper<E, P, C, K, H, S> target; |
| 20 | private Mapper<Handle<E,P,C,K>>[] mappers; |
| 21 | |
| 22 | public MappingEventHandler(EventHandlerWrapper<E, P, C, K, H, S> target, Mapper<Handle<E,P,C,K>>[] mappers) { |
| 23 | this.target = target; |
| 24 | this.mappers = mappers; |
| 25 | } |
| 26 | |
| 27 | @Override |
| 28 | public boolean consumes() { |
| 29 | return target.consumes(); |
| 30 | } |
| 31 | |
| 32 | @Override |
| 33 | public int getCardinality() { |
| 34 | return mappers.length; |
| 35 | } |
| 36 | |
| 37 | @Override |
| 38 | public C getContext() { |
| 39 | return target.getContext(); |
| 40 | } |
| 41 | |
| 42 | @Override |
| 43 | public P getPriority() { |
| 44 | return target.getPriority(); |
| 45 | } |
| 46 | |
| 47 | @SuppressWarnings("unchecked") |
| 48 | @Override |
| 49 | public void post( |
| 50 | final EventDispatchContext<E,P,C,H,S> context, |
| 51 | InferenceContext<E,P,C,K,H,S> inferenceContext, |
| 52 | final Handle<E,P,C,K>[]... handles) { |
| 53 | |
| 54 | Handle<E,P,C,K>[] targetInput = new Handle[target.getCardinality()]; |
| 55 | for (int i=0; i<mappers.length; ++i) { |
| 56 | mappers[i].map(handles[i], targetInput); |
| 57 | } |
| 58 | |
| 59 | EventDispatchJoinContext<E,P,C,H,S> mappingContext = new EventDispatchJoinContextFilter<E,P,C,H,S>(context) { |
| 60 | |
| 61 | public void consumeJoin(E event) { |
| 62 | for (int i=0; i<handles.length; ++i) { |
| 63 | for (Handle<E,P,C,K> h: handles[i]) { |
| 64 | if (event==h.getEvent()) { |
| 65 | ((EventDispatchJoinContext<E, P, C, H, S>) context).consumeJoin(i); |
| 66 | return; |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | }; |
| 71 | |
| 72 | @Override |
| 73 | public void consumeJoin(int index) { |
| 74 | for (int i=0; i<mappers.length; ++i) { |
| 75 | for (int idx: mappers[i].getIndexMap()) { |
| 76 | if (idx==index) { |
| 77 | ((EventDispatchJoinContext<E, P, C, H, S>) context).consumeJoin(i); |
| 78 | return; |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | }; |
| 85 | |
| 86 | target.post(mappingContext, inferenceContext, targetInput); |
| 87 | } |
| 88 | |
| 89 | @Override |
| 90 | public void reset() { |
| 91 | target.reset(); |
| 92 | } |
| 93 | |
| 94 | @Override |
| 95 | public String toString() { |
| 96 | return "MappingEventHandler [target=" + target + ", mappers=" + Arrays.toString(mappers) + "]"; |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public boolean isOneOff() { |
| 101 | return target.isOneOff(); |
| 102 | } |
| 103 | |
| 104 | @Override |
| 105 | public Mode getMode() { |
| 106 | return target.getMode(); |
| 107 | } |
| 108 | |
| 109 | @Override |
| 110 | public Predicate<E, C> getPredicate() { |
| 111 | throw new UnsupportedOperationException(); // TODO - Map target predicate if needed. |
| 112 | } |
| 113 | |
| 114 | |
| 115 | } |