Add Javadoc and remove all Checkstyle issues from API and natives.

api/src/main/java/com/velocitypowered/api/event/player/KickedFromServerEvent.java

@@ -11,7 +11,9 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
  * Fired when a player is kicked from a server. You may either allow Velocity to kick the player
- * (with an optional reason override) or redirect the player to a separate server.
+ * (with an optional reason override) or redirect the player to a separate server. By default,
+ * Velocity will notify the user (if they are already connected to a server) or disconnect them
+ * (if they are not on a server and no other servers are available).
  */
 public final class KickedFromServerEvent implements
     ResultedEvent<KickedFromServerEvent.ServerKickResult> {
@@ -22,6 +24,14 @@ public final class KickedFromServerEvent implements
   private final boolean duringServerConnect;
   private ServerKickResult result;
 
+  /**
+   * Creates a {@code KickedFromServerEvent} instance.
+   * @param player the player affected
+   * @param server the server the player disconnected from
+   * @param originalReason the reason for being kicked, optional
+   * @param duringServerConnect whether or not the player was kicked during the connection process
+   * @param fancyReason a fancy reason for being disconnected, used for the initial result
+   */
   public KickedFromServerEvent(Player player, RegisteredServer server,
       @Nullable Component originalReason, boolean duringServerConnect, Component fancyReason) {
     this.player = Preconditions.checkNotNull(player, "player");

api/src/main/java/com/velocitypowered/api/event/player/PlayerChatEvent.java

@@ -16,6 +16,11 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
   private final String message;
   private ChatResult result;
 
+  /**
+   * Constructs a PlayerChatEvent.
+   * @param player the player sending the message
+   * @param message the message being sent
+   */
   public PlayerChatEvent(Player player, String message) {
     this.player = Preconditions.checkNotNull(player, "player");
     this.message = Preconditions.checkNotNull(message, "message");
@@ -57,11 +62,10 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
     private static final ChatResult ALLOWED = new ChatResult(true, null);
     private static final ChatResult DENIED = new ChatResult(false, null);
 
-    // The server can not accept formatted text from clients!
     private @Nullable String message;
     private final boolean status;
 
-    protected ChatResult(boolean status, @Nullable String message) {
+    private ChatResult(boolean status, @Nullable String message) {
       this.status = status;
       this.message = message;
     }
@@ -76,10 +80,18 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
       return status ? "allowed" : "denied";
     }
 
+    /**
+     * Allows the message to be sent, without modification.
+     * @return the allowed result
+     */
     public static ChatResult allowed() {
       return ALLOWED;
     }
 
+    /**
+     * Prevents the message from being sent.
+     * @return the denied result
+     */
     public static ChatResult denied() {
       return DENIED;
     }
@@ -88,6 +100,11 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
       return Optional.ofNullable(message);
     }
 
+    /**
+     * Allows the message to be sent, but silently replaced with another.
+     * @param message the message to use instead
+     * @return a result with a new message
+     */
     public static ChatResult message(@NonNull String message) {
       Preconditions.checkNotNull(message, "message");
       return new ChatResult(true, message);

api/src/main/java/com/velocitypowered/api/event/player/PlayerModInfoEvent.java

@@ -6,7 +6,7 @@ import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.util.ModInfo;
 
 /**
- * This event is fired when the players ModInfo is changed.
+ * This event is fired when a Forge client sends its mods to the proxy while connecting to a server.
  */
 public final class PlayerModInfoEvent {
 

api/src/main/java/com/velocitypowered/api/event/player/ServerPreConnectEvent.java

@@ -2,6 +2,8 @@ package com.velocitypowered.api.event.player;
 
 import com.google.common.base.Preconditions;
 import com.velocitypowered.api.event.ResultedEvent;
+import com.velocitypowered.api.proxy.ConnectionRequestBuilder;
+import com.velocitypowered.api.proxy.ConnectionRequestBuilder.Status;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import java.util.Optional;
@@ -17,6 +19,11 @@ public final class ServerPreConnectEvent implements
   private final RegisteredServer originalServer;
   private ServerResult result;
 
+  /**
+   * Creates the ServerPreConnectEvent.
+   * @param player the player who is connecting to a server
+   * @param originalServer the server the player was trying to connect to
+   */
   public ServerPreConnectEvent(Player player, RegisteredServer originalServer) {
     this.player = Preconditions.checkNotNull(player, "player");
     this.originalServer = Preconditions.checkNotNull(originalServer, "originalServer");
@@ -80,10 +87,21 @@ public final class ServerPreConnectEvent implements
       return "denied";
     }
 
+    /**
+     * Returns a result that will prevent players from connecting to another server. If this result
+     * is used, then {@link ConnectionRequestBuilder#connect()}'s result will have the status
+     * {@link Status#CONNECTION_CANCELLED}.
+     * @return a result to deny conneections
+     */
     public static ServerResult denied() {
       return DENIED;
     }
 
+    /**
+     * Allows the player to connect to the specified server.
+     * @param server the new server to connect to
+     * @return a result to allow the player to connect to the specified server
+     */
     public static ServerResult allowed(RegisteredServer server) {
       Preconditions.checkNotNull(server, "server");
       return new ServerResult(server);

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

@@ -50,7 +50,16 @@ public interface TabList {
    */
   Collection<TabListEntry> getEntries();
 
-  // Necessary because the TabListEntry implementation isn't in the api
+  /**
+   * Builds a tab list entry.
+   *
+   * @deprecated Internal usage. Use {@link TabListEntry.Builder} instead.
+   * @param profile profile
+   * @param displayName display name
+   * @param latency latency
+   * @param gameMode game mode
+   * @return entry
+   */
   @Deprecated
   TabListEntry buildEntry(GameProfile profile, @Nullable Component displayName, int latency,
       int gameMode);

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

@@ -86,7 +86,7 @@ public interface TabListEntry {
   int getGameMode();
 
   /**
-   * Sets the game mode for {@code this} entry to the specified value
+   * Sets the game mode for {@code this} entry to the specified value.
    *
    * @param gameMode to change to
    * @return {@code this}, for chaining

api/src/main/java/com/velocitypowered/api/proxy/server/QueryResponse.java

@@ -195,33 +195,63 @@ public final class QueryResponse {
     private Builder() {
     }
 
+    /**
+     * Sets the hostname for the response.
+     * @param hostname the hostname to set
+     * @return this builder, for chaining
+     */
     public Builder hostname(String hostname) {
       this.hostname = Preconditions.checkNotNull(hostname, "hostname");
       return this;
     }
 
+    /**
+     * Sets the game version for the response.
+     * @param gameVersion the game version to set
+     * @return this builder, for chaining
+     */
     public Builder gameVersion(String gameVersion) {
       this.gameVersion = Preconditions.checkNotNull(gameVersion, "gameVersion");
       return this;
     }
 
+    /**
+     * Sets the map that will appear in the response.
+     * @param map the map to set
+     * @return this builder, for chaining
+     */
     public Builder map(String map) {
       this.map = Preconditions.checkNotNull(map, "map");
       return this;
     }
 
+    /**
+     * Sets the players that are currently claimed to be online.
+     * @param currentPlayers a non-negative number representing all players online
+     * @return this builder, for chaining
+     */
     public Builder currentPlayers(int currentPlayers) {
       Preconditions.checkArgument(currentPlayers >= 0, "currentPlayers cannot be negative");
       this.currentPlayers = currentPlayers;
       return this;
     }
 
+    /**
+     * Sets the maximum number of players this server purportedly can hold.
+     * @param maxPlayers a non-negative number representing the maximum number of builders
+     * @return this builder, for chaining
+     */
     public Builder maxPlayers(int maxPlayers) {
       Preconditions.checkArgument(maxPlayers >= 0, "maxPlayers cannot be negative");
       this.maxPlayers = maxPlayers;
       return this;
     }
 
+    /**
+     * Sets the host where this proxy is running.
+     * @param proxyHost the host where the proxy is running
+     * @return this instance, for chaining
+     */
     public Builder proxyHost(String proxyHost) {
       this.proxyHost = Preconditions.checkNotNull(proxyHost, "proxyHost");
       return this;
@@ -239,33 +269,62 @@ public final class QueryResponse {
       return this;
     }
 
+    /**
+     * Adds the specified players to the player list.
+     * @param players the players to add
+     * @return this builder, for chaining
+     */
     public Builder players(Collection<String> players) {
       this.players.addAll(Preconditions.checkNotNull(players, "players"));
       return this;
     }
 
+    /**
+     * Adds the specified players to the player list.
+     * @param players the players to add
+     * @return this builder, for chaining
+     */
     public Builder players(String... players) {
       this.players.addAll(Arrays.asList(Preconditions.checkNotNull(players, "players")));
       return this;
     }
 
+    /**
+     * Removes all players from the builder. This does not affect {@link #getCurrentPlayers()}.
+     * @return this builder, for chaining
+     */
     public Builder clearPlayers() {
       this.players.clear();
       return this;
     }
 
+    /**
+     * Sets the proxy version.
+     * @param proxyVersion the proxy version to set
+     * @return this builder, for chaining
+     */
     public Builder proxyVersion(String proxyVersion) {
       this.proxyVersion = Preconditions.checkNotNull(proxyVersion, "proxyVersion");
       return this;
     }
 
+    /**
+     * Adds the specified plugins to the plugins list.
+     * @param plugins the plugins to add
+     * @return this builder, for chaining
+     */
     public Builder plugins(Collection<PluginInformation> plugins) {
       this.plugins.addAll(Preconditions.checkNotNull(plugins, "plugins"));
       return this;
     }
 
+    /**
+     * Adds the specified plugins to the plugins list.
+     * @param plugins the plugins to add
+     * @return this builder, for chaining
+     */
     public Builder plugins(PluginInformation... plugins) {
-      this.plugins.addAll(Arrays.asList(Preconditions.checkNotNull(plugins, "plugins")));
+      this.plugins.addAll(Arrays.asList(plugins));
       return this;
     }
 

api/src/main/java/com/velocitypowered/api/proxy/server/ServerPing.java

@@ -29,6 +29,14 @@ public final class ServerPing {
     this(version, players, description, favicon, ModInfo.DEFAULT);
   }
 
+  /**
+   * Constructs a ServerPing instance.
+   * @param version the version of the server
+   * @param players the players on the server
+   * @param description the MOTD for the server
+   * @param favicon the server's favicon
+   * @param modinfo the mods this server runs
+   */
   public ServerPing(Version version, @Nullable Players players, Component description,
       @Nullable Favicon favicon, @Nullable ModInfo modinfo) {
     this.version = Preconditions.checkNotNull(version, "version");

api/src/main/java/com/velocitypowered/api/util/GameProfile.java

@@ -11,7 +11,8 @@ import java.util.UUID;
 public final class GameProfile {
 
   private final UUID id;
-  private final String undashedId, name;
+  private final String undashedId;
+  private final String name;
   private final List<Property> properties;
 
   public GameProfile(UUID id, String name, List<Property> properties) {
@@ -136,12 +137,21 @@ public final class GameProfile {
         + '}';
   }
 
+  /**
+   * Represents a Mojang profile property. Just like {@link GameProfile}, this class is immutable.
+   */
   public static final class Property {
 
     private final String name;
     private final String value;
     private final String signature;
 
+    /**
+     * Creates a profile property entry.
+     * @param name the name of the property
+     * @param value the value of the property
+     * @param signature the Mojang signature for the property
+     */
     public Property(String name, String value, String signature) {
       this.name = Preconditions.checkNotNull(name, "name");
       this.value = Preconditions.checkNotNull(value, "value");

native/src/main/java/com/velocitypowered/natives/util/NativeCodeLoader.java

@@ -76,10 +76,10 @@ public final class NativeCodeLoader<T> implements Supplier<T> {
   }
 
   static final BooleanSupplier MACOS = () ->
-      System.getProperty("os.name", "").equalsIgnoreCase("Mac OS X") &&
+      System.getProperty("os.name", "").equalsIgnoreCase("Mac OS X")
-          System.getProperty("os.arch").equals("x86_64");
+          && System.getProperty("os.arch").equals("x86_64");
   static final BooleanSupplier LINUX = () ->
-      System.getProperties().getProperty("os.name", "").equalsIgnoreCase("Linux") &&
+      System.getProperties().getProperty("os.name", "").equalsIgnoreCase("Linux")
-          System.getProperty("os.arch").equals("amd64");
+          && System.getProperty("os.arch").equals("amd64");
   static final BooleanSupplier ALWAYS = () -> true;
 }

native/src/main/java/com/velocitypowered/natives/util/Natives.java

@@ -43,7 +43,7 @@ public class Natives {
     };
   }
 
-  public static final NativeCodeLoader<VelocityCompressorFactory> compressor = new NativeCodeLoader<>(
+  public static final NativeCodeLoader<VelocityCompressorFactory> compress = new NativeCodeLoader<>(
       ImmutableList.of(
           new NativeCodeLoader.Variant<>(NativeCodeLoader.MACOS,
               copyAndLoadNative("/macosx/velocity-compress.dylib"), "native (macOS)",

native/src/test/java/com/velocitypowered/natives/compression/VelocityCompressorTest.java

@@ -20,13 +20,13 @@ class VelocityCompressorTest {
 
   @BeforeAll
   static void checkNatives() {
-    Natives.compressor.getLoadedVariant();
+    Natives.compress.getLoadedVariant();
   }
 
   @Test
   @EnabledOnOs({MAC, LINUX})
   void nativeIntegrityCheck() throws DataFormatException {
-    VelocityCompressor compressor = Natives.compressor.get().create(Deflater.DEFAULT_COMPRESSION);
+    VelocityCompressor compressor = Natives.compress.get().create(Deflater.DEFAULT_COMPRESSION);
     if (compressor instanceof JavaVelocityCompressor) {
       compressor.dispose();
       fail("Loaded regular compressor");

native/src/test/java/com/velocitypowered/natives/encryption/VelocityCipherTest.java

@@ -28,7 +28,7 @@ class VelocityCipherTest {
   void nativeIntegrityCheck() throws GeneralSecurityException {
     VelocityCipherFactory factory = Natives.cipher.get();
     if (factory == JavaVelocityCipher.FACTORY) {
-      fail("Loaded regular compressor");
+      fail("Loaded regular cipher");
     }
     check(factory);
   }

proxy/src/main/java/com/velocitypowered/proxy/connection/MinecraftConnection.java

@@ -248,7 +248,7 @@ public class MinecraftConnection extends ChannelInboundHandlerAdapter {
     }
 
     int level = server.getConfiguration().getCompressionLevel();
-    VelocityCompressor compressor = Natives.compressor.get().create(level);
+    VelocityCompressor compressor = Natives.compress.get().create(level);
     MinecraftCompressEncoder encoder = new MinecraftCompressEncoder(threshold, compressor);
     MinecraftCompressDecoder decoder = new MinecraftCompressDecoder(threshold, compressor);
 

proxy/src/main/java/com/velocitypowered/proxy/network/ConnectionManager.java

@@ -39,7 +39,7 @@ public final class ConnectionManager {
 
   public void logChannelInformation() {
     LOGGER.info("Connections will use {} channels, {} compression, {} ciphers", this.transportType,
-        Natives.compressor.getLoadedVariant(), Natives.cipher.getLoadedVariant());
+        Natives.compress.getLoadedVariant(), Natives.cipher.getLoadedVariant());
   }
 
   public void bind(final InetSocketAddress address) {