130 lines
4.5 KiB
Java
130 lines
4.5 KiB
Java
/*
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* Super Lead rope mod
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* Copyright (C) 2025 R3944Realms
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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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* 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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* 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 top.r3944realms.lib39.util.riding;
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import net.minecraft.world.entity.Entity;
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import net.minecraft.world.entity.EntityType;
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import org.jetbrains.annotations.Contract;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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import top.r3944realms.lib39.util.lang.Pair;
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import java.util.*;
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import java.util.function.Function;
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/**
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* The type Riding saver.
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*/
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@SuppressWarnings("unused")
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public class RidingSaver {
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/**
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* 保存骑乘关系
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*
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* @param entity the entity
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* @return the riding relationship
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*/
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@Contract("null -> new")
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public static @NotNull RidingRelationship save(@Nullable Entity entity) {
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return save(entity, true);
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}
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/**
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* 保存骑乘关系
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*
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* @param entity the entity
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* @param findRoot the find root
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* @return the riding relationship
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*/
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@Contract("null, _ -> new")
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public static @NotNull RidingRelationship save(@Nullable Entity entity, boolean findRoot) {
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if (entity == null) {
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return new RidingRelationship(Collections.emptyList(), null, null);
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}
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Entity rootEntity = findRoot ? RidingFinder.findRootVehicle(entity) : entity;
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if (rootEntity == null) {
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return new RidingRelationship(Collections.emptyList(), null, null);
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}
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RidingRelationship rootRelationship = new RidingRelationship();
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rootRelationship.setEntityId(rootEntity.getUUID());
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rootRelationship.setVehicleId(null);
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rootRelationship.setPassengers(new ArrayList<>());
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Queue<Pair<Entity, RidingRelationship>> queue = new LinkedList<>();
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queue.offer(Pair.of(rootEntity, rootRelationship));
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Set<UUID> processedEntities = new HashSet<>();
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processedEntities.add(rootEntity.getUUID());
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while (!queue.isEmpty()) {
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Pair<Entity, RidingRelationship> current = queue.poll();
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Entity currentEntity = current.first;
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RidingRelationship currentRelation = current.second;
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List<Entity> passengers = currentEntity.getPassengers();
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if (!passengers.isEmpty()) {
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for (Entity passenger : passengers) {
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UUID passengerId = passenger.getUUID();
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if (!processedEntities.contains(passengerId)) {
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processedEntities.add(passengerId);
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// ⬇ 构建子关系
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RidingRelationship passengerRelation = new RidingRelationship();
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passengerRelation.setEntityId(passengerId);
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passengerRelation.setVehicleId(currentEntity.getUUID());
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passengerRelation.setPassengers(new ArrayList<>());
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currentRelation.addPassenger(passengerRelation);
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queue.offer(Pair.of(passenger, passengerRelation));
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} else {
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throw new RidingCycleException(
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passengerId,
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currentEntity.getUUID()
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);
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}
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}
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}
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}
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return rootRelationship;
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}
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// 传入一个实体提供器 Function<UUID, Entity>，通常在服务器侧就是 level::getEntity
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private static Function<UUID, Entity> entityProvider;
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/**
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* Sets entity provider.
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*
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* @param provider the provider
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*/
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public static void setEntityProvider(Function<UUID, Entity> provider) {
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entityProvider = provider;
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}
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/**
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* 根据UUID获取EntityType
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*/
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private static @Nullable EntityType<?> getEntityType(UUID entityId) {
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if (entityProvider == null) return null;
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Entity entity = entityProvider.apply(entityId);
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if (entity == null) return null;
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return entity.getType();
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}
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}
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