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add event api javadocs v1

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This commit is contained in:
Matt Worzala 2021-06-08 16:58:48 -04:00
parent 3fae5ed35f
commit d38c0368fc
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10 changed files with 270 additions and 8 deletions
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1
src/main/java/net/minestom/server/event/CancellableEvent.java
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@ -2,6 +2,7 @@ package net.minestom.server.event;
/**
* Represents an {@link Event} which can be cancelled.
* Called using {@link EventDispatcher#callCancellable(CancellableEvent, Runnable)}.
*/
public interface CancellableEvent extends Event {

2
src/main/java/net/minestom/server/event/Event.java
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@ -5,7 +5,7 @@ import net.minestom.server.event.handler.EventHandler;
/**
* Event which can be listened to by an {@link EventHandler}.
* <p>
* Called using {@link EventHandler#callEvent(Class, Event)}.
* Called using {@link EventDispatcher#call(Event)}.
*/
public interface Event {
}

26
src/main/java/net/minestom/server/event/EventFilter.java
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@ -11,6 +11,20 @@ import org.jetbrains.annotations.Nullable;
import java.util.function.Function;
/**
* Represents a filter for a specific {@link Event} type.
* <p>
* The handler represents a "target" of the event. This can be used
* to create filters for all events of a specific type using information
* about the target.
* <p>
* For example, the target of a {@link PlayerEvent} is a {@link Player} so
* you could create a player event filter which checks if the target player
* is in creative mode.
*
* @param <E> The event type to filter
* @param <H> The handler type to filter on.
*/
public interface EventFilter<E extends Event, H> {
EventFilter<Event, ?> ALL = from(Event.class, null);
@ -35,7 +49,19 @@ public interface EventFilter<E extends Event, H> {
};
}
/**
* Gets the handler for the given event instance, or null if the event
* type has no handler.
*
* @param event The event instance
* @return The handler, if it exists for the given event
*/
@Nullable H getHandler(@NotNull E event);
/**
* The event type to filter on.
*
* @return The event type.
*/
@NotNull Class<E> getEventType();
}

35
src/main/java/net/minestom/server/event/EventListener.java
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@ -9,6 +9,13 @@ import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Consumer;
import java.util.function.Predicate;
/**
* Represents an event listener (handler) in an event graph.
* <p>
* A listener is responsible for executing some action based on an event triggering.
*
* @param <T> The event type being handled.
*/
public interface EventListener<T extends Event> {
@NotNull Class<T> getEventType();
@ -20,6 +27,15 @@ public interface EventListener<T extends Event> {
return new EventListener.Builder<>(eventType);
}
/**
* Create an event listener without any special options. The given listener will be executed
* if the event passes all parent filtering.
*
* @param eventType The event type to handle
* @param listener The handler function
* @param <T> The event type to handle
* @return An event listener with the given properties
*/
@Contract(pure = true)
static <T extends Event> @NotNull EventListener<T> of(@NotNull Class<T> eventType, @NotNull Consumer<@NotNull T> listener) {
return new EventListener<>() {
@ -47,24 +63,43 @@ public interface EventListener<T extends Event> {
this.eventType = eventType;
}
/**
* Adds a filter to the executor of this listener. The executor will only
* be called if this condition passes on the given event.
*/
@Contract(value = "_ -> this")
public @NotNull EventListener.Builder<T> filter(Predicate<T> filter) {
this.filters.add(filter);
return this;
}
/**
* Removes this listener after it has been executed the given number of times.
*
* @param expireCount The number of times to execute
*/
@Contract(value = "_ -> this")
public @NotNull EventListener.Builder<T> expireCount(int expireCount) {
this.expireCount = expireCount;
return this;
}
/**
* Expires this listener when it passes the given condition. The expiration will
* happen before the event is executed.
*
* @param expireWhen The condition to test
*/
@Contract(value = "_ -> this")
public @NotNull EventListener.Builder<T> expireWhen(Predicate<T> expireWhen) {
this.expireWhen = expireWhen;
return this;
}
/**
* Sets the handler for this event listener. This will be executed if the listener passes
* all conditions.
*/
@Contract(value = "_ -> this")
public @NotNull EventListener.Builder<T> handler(Consumer<T> handler) {
this.handler = handler;

199
src/main/java/net/minestom/server/event/EventNode.java
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@ -16,26 +16,67 @@ import java.util.function.BiPredicate;
import java.util.function.Consumer;
import java.util.function.Predicate;
/**
* Represents a single node in an event graph.
* <p>
* A node may contain any number of children and/or listeners. When an event is called,
* the node will filter it based on the parameters given at creation and then propagate
* it down to child nodes and listeners if it passes.
*
* @param <T> The event type accepted by this node
*/
public class EventNode<T extends Event> {
/**
* Creates an event node which accepts any event type with no filtering.
*
* @param name The name of the node
* @return An event node with no filtering
*/
@Contract(value = "_ -> new", pure = true)
public static @NotNull EventNode<Event> all(@NotNull String name) {
return type(name, EventFilter.ALL);
}
@Contract(value = "_, _, _ -> new", pure = true)
public static <E extends Event, V> @NotNull EventNode<E> type(@NotNull String name,
@NotNull EventFilter<E, V> filter,
@NotNull BiPredicate<E, V> predicate) {
return create(name, filter, predicate);
}
/**
* Creates an event node which accepts any event of the given type. The type is provided
* by the {@link EventFilter}.
* <p>
* For example, you could create an event filter which only accepts player events with the following
* <p><pre>
* var playerEventNode = EventNode.type("demo", EventFilter.PLAYER);
* </pre>
*
* @param name The name of the event node
* @param filter The event type filter to apply
* @param <E> The resulting event type of the node
* @return A node with just an event type filter
*/
@Contract(value = "_, _ -> new", pure = true)
public static <E extends Event, V> @NotNull EventNode<E> type(@NotNull String name,
@NotNull EventFilter<E, V> filter) {
return create(name, filter, null);
}
/**
* Creates an event node which accepts any event of the given type which passes
* the provided condition. The condition is based on the event object itself.
* <p>
* For example, you could create an event filter which only accepts player events
* where the player is in the pos x/z quadrant of the world.
* <p><pre>
* var playerInPosXZNode = EventNode.event("abc", EventFilter.PLAYER, event -> {
* var position = event.getPlayer().getPosition();
* return position.getX() > 0 && position.getZ() > 0;
* });
* </pre>
*
* @param name The name of the event node
* @param filter The event type filter to apply
* @param predicate The event condition
* @param <E> The resulting event type of the node
* @return A node with an event type filter as well as a condition on the event.
*/
@Contract(value = "_, _, _ -> new", pure = true)
public static <E extends Event, V> @NotNull EventNode<E> event(@NotNull String name,
@NotNull EventFilter<E, V> filter,
@ -43,6 +84,52 @@ public class EventNode<T extends Event> {
return create(name, filter, (e, h) -> predicate.test(e));
}
/**
* Creates an event node which accepts any event of the given type which passes
* the provided condition. The condition is based on the event object as well as
* the event handler type defined in the {@link EventFilter}.
* <p>
* For example, you could create an event filter which only accepts player events
* where the player is in the pos x/z quadrant of the world.
* <p><pre>
* var playerInPosXZNode = EventNode.type("abc", EventFilter.PLAYER, (event, player) -> {
* var position = player.getPosition();
* return position.getX() > 0 && position.getZ() > 0;
* });
* </pre>
*
* @param name The name of the event node
* @param filter The event type filter to apply
* @param predicate The event condition
* @param <E> The resulting event type of the node
* @param <V> The handler type of the event filter
* @return A node with an event type filter as well as a condition on the event.
*/
@Contract(value = "_, _, _ -> new", pure = true)
public static <E extends Event, V> @NotNull EventNode<E> type(@NotNull String name,
@NotNull EventFilter<E, V> filter,
@NotNull BiPredicate<E, V> predicate) {
return create(name, filter, predicate);
}
/**
* Creates an event node which accepts any event of the given type which passes
* the provided condition. The condition is based on the event handler defined
* by the {@link EventFilter}.
* <p>
* For example, you could create an event filter which only accepts player events
* where the player is in creative mode.
* <p><pre>
* var playerIsCreative = EventNode.value("abc", EventFilter.PLAYER, Player::isCreative);
* </pre>
*
* @param name The name of the event node
* @param filter The event type filter to apply
* @param predicate The event condition
* @param <E> The resulting event type of the node
* @param <V> The handler type of the event filter
* @return A node with an event type filter as well as a condition on the event.
*/
@Contract(value = "_, _, _ -> new", pure = true)
public static <E extends Event, V> @NotNull EventNode<E> value(@NotNull String name,
@NotNull EventFilter<E, V> filter,
@ -50,6 +137,18 @@ public class EventNode<T extends Event> {
return create(name, filter, (e, h) -> predicate.test(h));
}
/**
* Creates an event node which accepts any event of the given type which has a handler who
* has the given tag.
*
* The {@link EventFilter}'s resulting event type must be {@link TagReadable}.
*
* @param name The name of the event node
* @param filter The event type filter to apply
* @param tag The tag which must be contained on the event handler
* @param <E> The resulting event type of the node
* @return A node with an event type filter as well as a handler with the provided tag
*/
@Contract(value = "_, _, _ -> new", pure = true)
public static <E extends Event> @NotNull EventNode<E> tag(@NotNull String name,
@NotNull EventFilter<E, ? extends TagReadable> filter,
@ -57,6 +156,17 @@ public class EventNode<T extends Event> {
return create(name, filter, (e, h) -> h.hasTag(tag));
}
/**
* Creates an event node which accepts any event of the given type which has a handler who
* has an applicable tag. An applicable tag means that it passes the given condition.
*
* @param name The name of the event node
* @param filter The event type filter to apply
* @param tag The tag which must be contained on the event handler
* @param consumer The condition to test against the tag, if it exists.
* @param <E> The resulting event type of the node
* @return A node with an event type filter as well as a handler with the provided tag
*/
@Contract(value = "_, _, _, _ -> new", pure = true)
public static <E extends Event, V> @NotNull EventNode<E> tag(@NotNull String name,
@NotNull EventFilter<E, ? extends TagReadable> filter,
@ -106,6 +216,15 @@ public class EventNode<T extends Event> {
return predicate.test(event, value);
}
/**
* Executes the given event on this node. The event must pass all conditions before
* it will be forwarded to the listeners.
* <p>
* Calling an event on a node will execute all child nodes, however, an event may be
* called anywhere on the event graph and it will propagate down from there only.
*
* @param event the event to execute
*/
public void call(@NotNull T event) {
final var eventClass = event.getClass();
if (!eventType.isAssignableFrom(eventClass)) {
@ -140,6 +259,13 @@ public class EventNode<T extends Event> {
}
}
/**
* Execute a cancellable event with a callback to execute if the event is successful.
* Event conditions and propagation is the same as {@link #call(Event)}.
*
* @param event The event to execute
* @param successCallback A callback if the event is not cancelled
*/
public void callCancellable(@NotNull T event, @NotNull Runnable successCallback) {
call(event);
if (!(event instanceof CancellableEvent) || !((CancellableEvent) event).isCancelled()) {
@ -168,11 +294,24 @@ public class EventNode<T extends Event> {
return parent;
}
/**
* Returns an unmodifiable view of the children in this node.
*
* @see #addChild(EventNode)
* @see #removeChild(EventNode)
*/
@Contract(pure = true)
public @NotNull Set<@NotNull EventNode<T>> getChildren() {
return Collections.unmodifiableSet(children);
}
/**
* Locates all child nodes with the given name and event type recursively starting at this node.
*
* @param name The event node name to filter for
* @param eventType The event node type to filter for
* @return All matching event nodes
*/
@Contract(pure = true)
public <E extends T> @NotNull List<EventNode<E>> findChildren(@NotNull String name, Class<E> eventType) {
if (children.isEmpty()) {
@ -190,11 +329,26 @@ public class EventNode<T extends Event> {
}
}
/**
* Locates all child nodes with the given name and event type recursively starting at this node.
*
* @param name The event name to filter for
* @return All matching event nodes
*/
@Contract(pure = true)
public @NotNull List<EventNode<T>> findChildren(@NotNull String name) {
return findChildren(name, eventType);
}
/**
* Replaces all children matching the given name and type recursively starting from this node.
* <p>
* Node: The callee may not be replaced by this call.
*
* @param name The event name to filter for
* @param eventType The event node type to filter for
* @param eventNode The replacement node
*/
public <E extends T> void replaceChildren(@NotNull String name, @NotNull Class<E> eventType, @NotNull EventNode<E> eventNode) {
if (children.isEmpty()) {
return;
@ -211,10 +365,24 @@ public class EventNode<T extends Event> {
}
}
/**
* Replaces all children matching the given name and type recursively starting from this node.
* <p>
* Node: The callee may not be replaced by this call.
*
* @param name The node name to filter for
* @param eventNode The replacement node
*/
public void replaceChildren(@NotNull String name, @NotNull EventNode<T> eventNode) {
replaceChildren(name, eventType, eventNode);
}
/**
* Recursively removes children with the given name and type starting at this node.
*
* @param name The node name to filter for
* @param eventType The node type to filter for
*/
public <E extends T> void removeChildren(@NotNull String name, @NotNull Class<E> eventType) {
if (children.isEmpty()) {
return;
@ -230,10 +398,21 @@ public class EventNode<T extends Event> {
}
}
/**
* Recursively removes children with the given name starting at this node.
*
* @param name The node name to filter for
*/
public void removeChildren(@NotNull String name) {
removeChildren(name, eventType);
}
/**
* Directly adds a child node to this node.
*
* @param child The child to add
* @return this, can be used for chaining
*/
@Contract(value = "_ -> this")
public @NotNull EventNode<T> addChild(@NotNull EventNode<? extends T> child) {
synchronized (GLOBAL_CHILD_LOCK) {
@ -257,6 +436,12 @@ public class EventNode<T extends Event> {
return this;
}
/**
* Directly removes the given child from this node.
*
* @param child The child to remove
* @return this, can be used for chaining
*/
@Contract(value = "_ -> this")
public @NotNull EventNode<T> removeChild(@NotNull EventNode<? extends T> child) {
synchronized (GLOBAL_CHILD_LOCK) {

3
src/main/java/net/minestom/server/event/trait/EntityEvent.java
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@ -4,6 +4,9 @@ import net.minestom.server.entity.Entity;
import net.minestom.server.event.Event;
import org.jetbrains.annotations.NotNull;
/**
* Represents any event called on an {@link Entity}.
*/
public interface EntityEvent extends Event {
/**

3
src/main/java/net/minestom/server/event/trait/InstanceEvent.java
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@ -4,6 +4,9 @@ import net.minestom.server.event.Event;
import net.minestom.server.instance.Instance;
import org.jetbrains.annotations.NotNull;
/**
* Represents any event targeting an {@link Instance}.
*/
public interface InstanceEvent extends Event {
/**

3
src/main/java/net/minestom/server/event/trait/InventoryEvent.java
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@ -4,6 +4,9 @@ import net.minestom.server.event.Event;
import net.minestom.server.inventory.Inventory;
import org.jetbrains.annotations.Nullable;
/**
* Represents any event inside an {@link Inventory}.
*/
public interface InventoryEvent extends Event {
/**

3
src/main/java/net/minestom/server/event/trait/ItemEvent.java
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@ -4,6 +4,9 @@ import net.minestom.server.event.Event;
import net.minestom.server.item.ItemStack;
import org.jetbrains.annotations.NotNull;
/**
* Represents any event called about an {@link ItemStack}.
*/
public interface ItemEvent extends Event {
@NotNull ItemStack getItemStack();
}

3
src/main/java/net/minestom/server/event/trait/PlayerEvent.java
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@ -3,6 +3,9 @@ package net.minestom.server.event.trait;
import net.minestom.server.entity.Player;
import org.jetbrains.annotations.NotNull;
/**
* Represents any event called on a {@link Player}.
*/
public interface PlayerEvent extends EntityEvent {
/**