| 1 | package com.hammurapi.eventbus; |
| 2 | |
| 3 | import com.hammurapi.extract.CommutativeAnd; |
| 4 | import com.hammurapi.extract.Predicate; |
| 5 | import com.hammurapi.extract.True; |
| 6 | |
| 7 | /** |
| 8 | * Base class for event handlers. |
| 9 | * @author Pavel Vlasov |
| 10 | * |
| 11 | * @param <E> |
| 12 | * @param <P> |
| 13 | * @param <C> |
| 14 | */ |
| 15 | public abstract class AbstractEventHandler<E, P extends Comparable<P>, C, H extends EventBus.Handle<E,P,C>, S extends EventStore<E,P,C,H,S>> implements EventHandler<E, P, C, H, S> { |
| 16 | |
| 17 | private boolean oneOff; |
| 18 | private Mode mode = Mode.POST; |
| 19 | private Predicate<E, C> predicate; |
| 20 | |
| 21 | public AbstractEventHandler() { |
| 22 | // Default constructor. |
| 23 | } |
| 24 | |
| 25 | public AbstractEventHandler( |
| 26 | int cardinality, |
| 27 | P priority, |
| 28 | C context, |
| 29 | boolean consumes, |
| 30 | boolean oneOff, |
| 31 | Mode mode, |
| 32 | Predicate<E, C> predicate) { |
| 33 | super(); |
| 34 | this.cardinality = cardinality; |
| 35 | this.priority = priority; |
| 36 | this.context = context; |
| 37 | this.consumes = consumes; |
| 38 | this.oneOff = oneOff; |
| 39 | this.mode = mode; |
| 40 | if (predicate == null) { |
| 41 | this.predicate = True.getInstance(); |
| 42 | } else { |
| 43 | this.predicate = predicate; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | public AbstractEventHandler( |
| 48 | int cardinality, |
| 49 | P priority, |
| 50 | C context, |
| 51 | boolean consumes, |
| 52 | boolean oneOff, |
| 53 | Mode mode, |
| 54 | Predicate<E, C>... predicates) { |
| 55 | this(cardinality, priority, context, consumes, oneOff, mode, wrap(predicates)); |
| 56 | } |
| 57 | |
| 58 | private static <E,C> Predicate<E, C> wrap(Predicate<E, C>[] predicates) { |
| 59 | if (predicates.length==0) { |
| 60 | return True.getInstance(); |
| 61 | } |
| 62 | |
| 63 | if (predicates.length==1) { |
| 64 | return predicates[0]; |
| 65 | } |
| 66 | |
| 67 | return new CommutativeAnd<E,C>(0, null, predicates); |
| 68 | } |
| 69 | |
| 70 | private boolean consumes = true; |
| 71 | private P priority; |
| 72 | private int cardinality = 1; |
| 73 | private C context; |
| 74 | |
| 75 | public void setCardinality(int cardinality) { |
| 76 | this.cardinality = cardinality; |
| 77 | } |
| 78 | |
| 79 | public void setConsumes(boolean consumes) { |
| 80 | this.consumes = consumes; |
| 81 | } |
| 82 | |
| 83 | public void setContext(C context) { |
| 84 | this.context = context; |
| 85 | } |
| 86 | |
| 87 | public void setPriority(P priority) { |
| 88 | this.priority = priority; |
| 89 | } |
| 90 | |
| 91 | @Override |
| 92 | public boolean consumes() { |
| 93 | return consumes; |
| 94 | } |
| 95 | |
| 96 | @Override |
| 97 | public P getPriority() { |
| 98 | return priority; |
| 99 | } |
| 100 | |
| 101 | @Override |
| 102 | public int getCardinality() { |
| 103 | return cardinality; |
| 104 | } |
| 105 | |
| 106 | @Override |
| 107 | public void reset() { |
| 108 | // NOP, override if needed. |
| 109 | } |
| 110 | |
| 111 | @Override |
| 112 | public C getContext() { |
| 113 | return context; |
| 114 | } |
| 115 | |
| 116 | @Override |
| 117 | public String toString() { |
| 118 | return "AbstractEventHandler("+super.toString()+") [consumes=" + consumes + ", priority=" |
| 119 | + priority + ", cardinality=" + cardinality + ", context=" |
| 120 | + context + "]"; |
| 121 | } |
| 122 | |
| 123 | @Override |
| 124 | public boolean isOneOff() { |
| 125 | return oneOff; |
| 126 | } |
| 127 | |
| 128 | public void setOneOff(boolean oneOff) { |
| 129 | this.oneOff = oneOff; |
| 130 | } |
| 131 | |
| 132 | @Override |
| 133 | public Mode getMode() { |
| 134 | return mode; |
| 135 | } |
| 136 | |
| 137 | public void setMode(Mode mode) { |
| 138 | this.mode = mode; |
| 139 | } |
| 140 | |
| 141 | @Override |
| 142 | public Predicate<E, C> getPredicate() { |
| 143 | return predicate; |
| 144 | } |
| 145 | |
| 146 | public void setPredicate(Predicate<E, C> predicate) { |
| 147 | this.predicate = predicate; |
| 148 | } |
| 149 | |
| 150 | } |