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