Initial tablist implementation

api/src/main/java/com/velocitypowered/api/proxy/Player.java

@@ -6,6 +6,7 @@ import com.velocitypowered.api.proxy.messages.ChannelMessageSource;
 import com.velocitypowered.api.proxy.player.PlayerSettings;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import com.velocitypowered.api.util.GameProfile;
+import com.velocitypowered.api.proxy.player.TabList;
 import com.velocitypowered.api.util.MessagePosition;
 import com.velocitypowered.api.util.title.Title;
 import java.util.List;
@@ -88,14 +89,20 @@ public interface Player extends CommandSource, InboundConnection, ChannelMessage
      * Sets the tab list header and footer for the player.
      * @param header the header component
      * @param footer the footer component
+     * @deprecated Use {@link TabList#setHeaderAndFooter(Component, Component)}.
      */
+    @Deprecated
     void setHeaderAndFooter(Component header, Component footer);
 
     /**
      * Clears the tab list header and footer for the player.
+     * @deprecated Use {@link TabList#clearHeaderAndFooter()}.
      */
+    @Deprecated
     void clearHeaderAndFooter();
 
+    TabList getTabList();
+
     /**
      * Disconnects the player with the specified reason. Once this method is called, further calls to other {@link Player}
      * methods will become undefined.

api/src/main/java/com/velocitypowered/api/proxy/player/TabList.java

@@ -0,0 +1,37 @@
+package com.velocitypowered.api.proxy.player;
+
+import com.velocitypowered.api.proxy.Player;
+import com.velocitypowered.api.util.GameProfile;
+import net.kyori.text.Component;
+
+import java.util.Collection;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * Represents the tab list of a {@link Player}.
+ * TODO: Desetude
+ */
+public interface TabList {
+    /**
+     * Sets the tab list header and footer for the player.
+     * @param header the header component
+     * @param footer the footer component
+     */
+    void setHeaderAndFooter(Component header, Component footer);
+
+    /**
+     * Clears the tab list header and footer for the player.
+     */
+    void clearHeaderAndFooter();
+
+    void addEntry(TabListEntry entry);
+
+    Optional<TabListEntry> removeEntry(UUID uuid);
+
+    Collection<TabListEntry> getEntries();
+
+    //Necessary because the TabListEntry implementation isn't in the api
+    @Deprecated
+    TabListEntry buildEntry(GameProfile profile, Component displayName, int latency, int gameMode);
+}

api/src/main/java/com/velocitypowered/api/proxy/player/TabListEntry.java

@@ -0,0 +1,75 @@
+package com.velocitypowered.api.proxy.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.util.GameProfile;
+import net.kyori.text.Component;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.Optional;
+
+/**
+ * TODO: Desetude
+ */
+public interface TabListEntry {
+    TabList getTabList();
+
+    GameProfile getProfile();
+
+    Optional<Component> getDisplayName();
+
+    TabListEntry setDisplayName(@Nullable Component displayName);
+
+    int getLatency();
+
+    TabListEntry setLatency(int latency);
+
+    int getGameMode();
+
+    TabListEntry setGameMode(int gameMode);
+
+    static Builder builder() {
+        return new Builder();
+    }
+
+    class Builder {
+        private TabList tabList;
+        private GameProfile profile;
+        private Component displayName;
+        private int latency = 0;
+        private int gameMode = 0;
+
+        private Builder() {}
+
+        public Builder tabList(TabList tabList) {
+            this.tabList = tabList;
+            return this;
+        }
+
+        public Builder profile(GameProfile profile) {
+            this.profile = profile;
+            return this;
+        }
+
+        public Builder displayName(@Nullable Component displayName) {
+            this.displayName = displayName;
+            return this;
+        }
+
+        public Builder latency(int latency) {
+            this.latency = latency;
+            return this;
+        }
+
+        public Builder gameMode(int gameMode) {
+            this.gameMode = gameMode;
+            return this;
+        }
+
+        public TabListEntry build() {
+            Preconditions.checkState(tabList != null, "The Tablist must be set when building a TabListEntry");
+            Preconditions.checkState(profile != null, "The GameProfile must be set when building a TabListEntry");
+
+            return tabList.buildEntry(profile, displayName, latency, gameMode);
+        }
+    }
+}