150 lines
5.9 KiB
Java
150 lines
5.9 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016-2020.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.event.world;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import net.minecraft.entity.EntityClassification;
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import net.minecraft.world.biome.MobSpawnInfo;
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import net.minecraft.world.gen.feature.structure.Structure;
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import net.minecraftforge.eventbus.api.Event;
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import net.minecraftforge.eventbus.api.EventPriority;
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/**
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* This event fires when a Structure is gathering what mobs/creatures can spawn in it.
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*
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* In order to maintain the most compatibility possible with other mods' modifications to a structure,
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* the event should be assigned a {@link net.minecraftforge.eventbus.api.EventPriority} as follows:
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*
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* - Additions : {@link EventPriority#HIGH}
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* - Removals : {@link EventPriority#NORMAL}
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* - Any other modification : {@link EventPriority#LOW}
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*
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* Be aware that another mod could have done an operation beforehand, so an expected value out of a vanilla structure might not
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* always be the same, depending on other mods.
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*/
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public class StructureSpawnListGatherEvent extends Event
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{
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private final Structure<?> structure;
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private final Map<EntityClassification, List<MobSpawnInfo.Spawners>> entitySpawns = new HashMap<>();
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private final Map<EntityClassification, List<MobSpawnInfo.Spawners>> entitySpawnsUnmodifiableLists = new HashMap<>();
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private final Map<EntityClassification, List<MobSpawnInfo.Spawners>> entitySpawnsUnmodifiable = Collections.unmodifiableMap(entitySpawnsUnmodifiableLists);
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private boolean insideOnly;
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public StructureSpawnListGatherEvent(Structure<?> structure)
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{
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this.structure = structure;
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this.insideOnly = this.structure.getDefaultRestrictsSpawnsToInside();
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addEntitySpawns(EntityClassification.MONSTER, this.structure.getDefaultSpawnList());
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addEntitySpawns(EntityClassification.CREATURE, this.structure.getDefaultCreatureSpawnList());
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}
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/**
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* @return Structure to add or remove spawns to/from.
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*/
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public Structure<?> getStructure()
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{
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return structure;
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}
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/**
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* Change if entity spawn location checks are done against the entire bounds of the structure or only the inside the pieces of the structure.
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* @param insideOnly {@code true} to restrict the spawn checks to inside the pieces of the structure, {@code false} to allow spawns outside
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*/
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public void setInsideOnly(boolean insideOnly)
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{
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this.insideOnly = insideOnly;
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}
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/**
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* Checks if spawns for the structure are restricted to being inside the individual pieces of the structure.
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*/
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public boolean isInsideOnly()
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{
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return insideOnly;
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}
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/**
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* Gets an unmodifiable view of the the list representing the entity spawns for the given classification.
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* @param classification Entity Classification
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* @return The list of spawns for the given classification.
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*/
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public List<MobSpawnInfo.Spawners> getEntitySpawns(EntityClassification classification)
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{
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return this.entitySpawnsUnmodifiableLists.getOrDefault(classification, Collections.emptyList());
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}
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/**
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* Gets the internal spawn list for a given entity classification, or adds one if needed. (This includes adding it to the unmodifiable view)
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*/
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private List<MobSpawnInfo.Spawners> getOrCreateEntitySpawns(EntityClassification classification)
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{
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return this.entitySpawns.computeIfAbsent(classification, c -> {
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List<MobSpawnInfo.Spawners> spawners = new ArrayList<>();
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//If the classification isn't in entitySpawns yet, also add an unmodifiable view of the list to
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// the unmodifiable list spawn map
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this.entitySpawnsUnmodifiableLists.put(c, Collections.unmodifiableList(spawners));
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return spawners;
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});
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}
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/**
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* Adds a spawn to the list of spawns for the given classification.
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* @param classification Entity Classification
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* @param spawner Spawner
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*/
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public void addEntitySpawn(EntityClassification classification, MobSpawnInfo.Spawners spawner)
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{
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getOrCreateEntitySpawns(classification).add(spawner);
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}
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/**
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* Adds spawns to the list of spawns for the given classification.
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* @param classification Entity Classification
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* @param spawners Spawners to add
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*/
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public void addEntitySpawns(EntityClassification classification, List<MobSpawnInfo.Spawners> spawners)
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{
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getOrCreateEntitySpawns(classification).addAll(spawners);
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}
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/**
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* Removes a spawn from the list of spawns for the given classification.
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* @param classification Entity Classification
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* @param spawner Spawner
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*/
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public void removeEntitySpawn(EntityClassification classification, MobSpawnInfo.Spawners spawner)
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{
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if (this.entitySpawns.containsKey(classification))
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this.entitySpawns.get(classification).remove(spawner);
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}
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/**
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* Gets an unmodifiable view of the map of spawns based on entity classification that is used to fill in the various spawn lists for the structure.
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*/
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public Map<EntityClassification, List<MobSpawnInfo.Spawners>> getEntitySpawns()
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{
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return entitySpawnsUnmodifiable;
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}
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} |