From 515248fa99f100a64e0e7f92c9ee60ab6f4c80ad Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Mon, 30 Jul 2018 20:49:43 -0400
Subject: [PATCH] Expand the remapping stuff.

---
 .../protocol/remap/EntityIdRemapper.java      |  2 +-
 .../remap/Minecraft18EntityIdRemapper.java    | 40 +++++++++++++++++++
 ...emapper.java => NoopEntityIdRemapper.java} |  6 +--
 3 files changed, 44 insertions(+), 4 deletions(-)
 create mode 100644 src/main/java/com/velocitypowered/proxy/protocol/remap/Minecraft18EntityIdRemapper.java
 rename src/main/java/com/velocitypowered/proxy/protocol/remap/{DummyEntityIdRemapper.java => NoopEntityIdRemapper.java} (73%)

diff --git a/src/main/java/com/velocitypowered/proxy/protocol/remap/EntityIdRemapper.java b/src/main/java/com/velocitypowered/proxy/protocol/remap/EntityIdRemapper.java
index 8ba085948..ad277d762 100644
--- a/src/main/java/com/velocitypowered/proxy/protocol/remap/EntityIdRemapper.java
+++ b/src/main/java/com/velocitypowered/proxy/protocol/remap/EntityIdRemapper.java
@@ -24,6 +24,6 @@ public interface EntityIdRemapper {
     void setServerEntityId(int id);
 
     static EntityIdRemapper getMapper(int eid, int protocolVersion) {
-        return DummyEntityIdRemapper.INSTANCE;
+        return NoopEntityIdRemapper.INSTANCE;
     }
 }
diff --git a/src/main/java/com/velocitypowered/proxy/protocol/remap/Minecraft18EntityIdRemapper.java b/src/main/java/com/velocitypowered/proxy/protocol/remap/Minecraft18EntityIdRemapper.java
new file mode 100644
index 000000000..e1d186b01
--- /dev/null
+++ b/src/main/java/com/velocitypowered/proxy/protocol/remap/Minecraft18EntityIdRemapper.java
@@ -0,0 +1,40 @@
+package com.velocitypowered.proxy.protocol.remap;
+
+import com.velocitypowered.proxy.protocol.ProtocolConstants;
+import io.netty.buffer.ByteBuf;
+
+public class Minecraft18EntityIdRemapper implements EntityIdRemapper {
+    private final int clientId;
+    private int serverId;
+
+    public Minecraft18EntityIdRemapper(int clientId, int serverId) {
+        this.clientId = clientId;
+        this.serverId = serverId;
+    }
+
+    @Override
+    public ByteBuf remap(ByteBuf original, ProtocolConstants.Direction direction) {
+        if (clientId == serverId) {
+            // If these are equal (i.e. first connection), no remapping is required.
+            return original.retain();
+        }
+
+        // TODO: Implement.
+        throw new UnsupportedOperationException("1.8 doesn't allow switching servers.");
+    }
+
+    @Override
+    public int getClientEntityId() {
+        return clientId;
+    }
+
+    @Override
+    public int getServerEntityId() {
+        return serverId;
+    }
+
+    @Override
+    public void setServerEntityId(int id) {
+        this.serverId = id;
+    }
+}
diff --git a/src/main/java/com/velocitypowered/proxy/protocol/remap/DummyEntityIdRemapper.java b/src/main/java/com/velocitypowered/proxy/protocol/remap/NoopEntityIdRemapper.java
similarity index 73%
rename from src/main/java/com/velocitypowered/proxy/protocol/remap/DummyEntityIdRemapper.java
rename to src/main/java/com/velocitypowered/proxy/protocol/remap/NoopEntityIdRemapper.java
index bd60ff333..f5a3b68f0 100644
--- a/src/main/java/com/velocitypowered/proxy/protocol/remap/DummyEntityIdRemapper.java
+++ b/src/main/java/com/velocitypowered/proxy/protocol/remap/NoopEntityIdRemapper.java
@@ -3,10 +3,10 @@ package com.velocitypowered.proxy.protocol.remap;
 import com.velocitypowered.proxy.protocol.ProtocolConstants;
 import io.netty.buffer.ByteBuf;
 
-public class DummyEntityIdRemapper implements EntityIdRemapper {
-    public static final DummyEntityIdRemapper INSTANCE = new DummyEntityIdRemapper();
+public class NoopEntityIdRemapper implements EntityIdRemapper {
+    public static final NoopEntityIdRemapper INSTANCE = new NoopEntityIdRemapper();
 
-    private DummyEntityIdRemapper() {
+    private NoopEntityIdRemapper() {
 
     }