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hashCodes are not allowed to change, however bukkit used a value that does change, the entityId. When an entity is teleported dimensions, the entity reference is replaced with a new one with a new entity ID. For hashCode, we can simply use the UUID's hashCode to keep the hashCode from changing. equals() is ok to use getEntityId() because equals() should only be true if both the left and right are the same reference. Since entity ids can not duplicate during runtime, this check is essentially the same as this.getHandle() == other.getHandle() However, replaced it too to make it clearer of intent.
50 lines
1.9 KiB
Diff
50 lines
1.9 KiB
Diff
From 19d1d25ea22f4d7d817dd9ab4194257099b4f27c Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sun, 10 Jun 2018 20:20:15 -0400
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Subject: [PATCH] Fix CraftEntity hashCode
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hashCodes are not allowed to change, however bukkit used a value
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that does change, the entityId.
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When an entity is teleported dimensions, the entity reference is
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replaced with a new one with a new entity ID.
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For hashCode, we can simply use the UUID's hashCode to keep
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the hashCode from changing.
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equals() is ok to use getEntityId() because equals() should only
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be true if both the left and right are the same reference.
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Since entity ids can not duplicate during runtime, this
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check is essentially the same as this.getHandle() == other.getHandle()
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However, replaced it too to make it clearer of intent.
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diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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index 1571e4eb5..22a1a4965 100644
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--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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@@ -503,14 +503,15 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
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return false;
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}
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final CraftEntity other = (CraftEntity) obj;
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- return (this.getEntityId() == other.getEntityId());
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+ return (this.getHandle() == other.getHandle()); // Paper - while logically the same, this is clearer
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}
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+ // Paper - Fix hashCode. entity ID's are not static.
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+ // A CraftEntity can change reference to a new entity with a new ID, and hash codes should never change
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@Override
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public int hashCode() {
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- int hash = 7;
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- hash = 29 * hash + this.getEntityId();
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- return hash;
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+ return getUniqueId().hashCode();
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+ // Paper end
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}
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public void setMetadata(String metadataKey, MetadataValue newMetadataValue) {
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--
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2.17.1
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