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A plugin API for Minecraft: Java Edition
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/*
* This file is part of SpongeAPI, licensed under the MIT License (MIT).
*
* Copyright (c) SpongePowered
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.spongepowered.api.event;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.spongepowered.api.util.CopyableBuilder;
import org.spongepowered.api.util.annotation.DoNotStore;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.StringJoiner;
import java.util.function.Supplier;
/**
* Provides context for an event outside of the direct chain of causes present
* in the event's {@link Cause}.
*/
@DoNotStore
public final class EventContext {
private static final EventContext EMPTY_CONTEXT = new EventContext(ImmutableMap.of());
/**
* Gets an empty context.
*
* @return The empty context
*/
public static EventContext empty() {
return EventContext.EMPTY_CONTEXT;
}
/**
* Creates a new {@link EventContext} from the given map of entries.
*
* @param entries The context entries
* @return The new EventContext
*/
public static EventContext of(Map, Object> entries) {
Objects.requireNonNull(entries, "Context entries cannot be null");
for (Map.Entry, Object> entry : entries.entrySet()) {
Objects.requireNonNull(entry.getValue(), "Entries cannot contain null values");
}
return new EventContext(entries);
}
/**
* Creates a new builder for creating an {@link EventContext}.
*
* @return The new builder
*/
public static Builder builder() {
return new Builder();
}
private final Map, Object> entries;
EventContext(Map, Object> values) {
this.entries = ImmutableMap.copyOf(values);
}
/**
* Gets the value corresponding to the given key from the context.
*
* @param key The key
* @param The type of the value stored with the key
* @return The context value, if found
*/
@SuppressWarnings("unchecked")
public Optional get(EventContextKey key) {
Objects.requireNonNull(key, "EventContextKey cannot be null");
return Optional.ofNullable((T) this.entries.get(key));
}
/**
* Gets the value corresponding to the given key from the context.
*
* @param key The key
* @param The type of the value stored with the key
* @return The context value, if found
*/
@SuppressWarnings("unchecked")
public Optional get(Supplier> key) {
Objects.requireNonNull(key, "EventContextKey cannot be null");
return Optional.ofNullable((T) this.entries.get(key.get()));
}
/**
* Gets the value corresponding to the given key from the context.
*
* If the key is not available, {@link NoSuchElementException} will be
* thrown.
*
* @param key The key
* @param The type of the value stored with the key
* @return The context value, if found
*/
public T require(EventContextKey key) {
final Optional optional = this.get(key);
if (optional.isPresent()) {
return optional.get();
}
throw new NoSuchElementException(String.format("Could not retrieve value for key '%s'", key.toString()));
}
/**
* Gets the value corresponding to the given key from the context.
*
* If the key is not available, {@link NoSuchElementException} will be
* thrown.
*
* @param key The key
* @param The type of the value stored with the key
* @return The context value, if found
*/
public T require(Supplier> key) {
final Optional optional = this.get(key);
if (optional.isPresent()) {
return optional.get();
}
throw new NoSuchElementException(String.format("Could not retrieve value for key '%s'", key.get().toString()));
}
/**
* Gets whether the provided {@link EventContextKey} is included in this
* context.
*
* @param key The context key to check
* @return True if the key is used and there is an entry for it
*/
public boolean containsKey(EventContextKey key) {
return this.entries.containsKey(key);
}
/**
* Gets whether the provided {@link EventContextKey} is included in this
* context.
*
* @param key The context key to check
* @return True if the key is used and there is an entry for it
*/
public boolean containsKey(Supplier> key) {
return this.entries.containsKey(key.get());
}
/**
* Gets all {@link EventContextKey}s present in this context.
*
* @return All present keys
*/
public Set> keySet() {
return this.entries.keySet();
}
/**
* Gets this event context as a {@link Map} of EventContextKeys to Objects.
*
* @return A map view of this context
*/
public Map, Object> asMap() {
return this.entries;
}
@Override
public boolean equals(@Nullable Object object) {
if (object == this) {
return true;
}
if (!(object instanceof EventContext)) {
return false;
}
final EventContext ctx = (EventContext) object;
for (Map.Entry, Object> entry : this.entries.entrySet()) {
final Object other = ctx.entries.get(entry.getKey());
if (other == null) {
return false;
}
if (!entry.getValue().equals(other)) {
return false;
}
}
return true;
}
@Override
public int hashCode() {
return this.entries.hashCode();
}
@Override
public String toString() {
final StringJoiner joiner = new StringJoiner(", ");
for (Map.Entry, Object> entry : this.entries.entrySet()) {
joiner.add("\"" + entry.getKey().toString() + "\"=" + entry.getValue().toString());
}
return "Context[" + joiner.toString() + "]";
}
public static final class Builder implements org.spongepowered.api.util.Builder, CopyableBuilder {
private final Map, Object> entries = Maps.newHashMap();
Builder() {
}
/**
* Adds the given context key value pair to the context.
*
* @param key The key
* @param The type of the value stored with the key
* @param value The value
* @return This builder, for chaining
*/
public Builder add(EventContextKey key, T value) {
Objects.requireNonNull(value, "Context object cannot be null");
if (this.entries.containsKey(key)) {
throw new IllegalArgumentException("Duplicate context keys: " + key.toString());
}
this.entries.put(key, value);
return this;
}
/**
* Adds the given context key value pair to the context.
*
* @param key The key
* @param The type of the value stored with the key
* @param value The value
* @return This builder, for chaining
*/
public Builder add(Supplier> key, T value) {
Objects.requireNonNull(value, "Context object cannot be null");
final EventContextKey suppliedKey = key.get();
Objects.requireNonNull(suppliedKey, "Supplied key cannot be null!");
if (this.entries.containsKey(suppliedKey)) {
throw new IllegalArgumentException("Duplicate context keys!");
}
this.entries.put(suppliedKey, value);
return this;
}
@Override
public Builder from(EventContext value) {
this.entries.putAll(value.entries);
return this;
}
@Override
public Builder reset() {
this.entries.clear();
return this;
}
/**
* Creates a new {@link EventContext}.
*
* @return The EventContext
*/
@Override
public EventContext build() {
return new EventContext(this.entries);
}
}
}