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https://github.com/plexusorg/Plex-FAWE.git
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d1af6c38e7
9516002 Register platforms and commands in a more proper way (1766)
80 lines
2.3 KiB
Java
80 lines
2.3 KiB
Java
/*
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* WorldEdit, a Minecraft world manipulation toolkit
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* Copyright (C) sk89q <http://www.sk89q.com>
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* Copyright (C) WorldEdit team and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.sk89q.worldedit.util.lifecycle;
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import java.util.Objects;
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import java.util.Optional;
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import javax.annotation.Nullable;
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/**
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* A {@link Lifecycled} that can be directly called to {@linkplain #invalidate() invalidate} it or
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* set a {@linkplain #newValue(Object) new value}.
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*/
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public final class SimpleLifecycled<T> implements Lifecycled<T> {
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public static <T> SimpleLifecycled<T> valid(T value) {
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return new SimpleLifecycled<>(Objects.requireNonNull(value));
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}
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public static <T> SimpleLifecycled<T> invalid() {
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return new SimpleLifecycled<>(null);
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}
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private final LifecycledCallbackHandler<T> events = new LifecycledCallbackHandler<>(this);
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@Nullable
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private T value;
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private SimpleLifecycled(@Nullable T value) {
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this.value = value;
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}
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/**
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* Set the value of this lifecycled and fire the new value event.
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*
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* @param value the value
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*/
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public void newValue(T value) {
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// Ensure lifecycle constraints are upheld.
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invalidate();
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this.value = Objects.requireNonNull(value);
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events.fireOnNewValue();
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}
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/**
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* Remove the value of this lifecycled and fire the invalidated event.
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*/
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public void invalidate() {
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boolean fire = this.value != null;
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this.value = null;
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if (fire) {
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events.fireInvalidated();
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}
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}
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@Override
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public Optional<T> value() {
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return Optional.ofNullable(value);
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}
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@Override
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public Events<T> events() {
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return events;
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}
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}
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