Add simple scoreboard API

src/main/java/cn/nukkit/Nukkit.java

@@ -42,7 +42,7 @@ public class Nukkit {
 
     public final static Properties GIT_INFO = getGitInfo();
     public final static String VERSION = getVersion();
-    public final static String API_VERSION = "1.0.14";
+    public final static String API_VERSION = "1.0.15";
     public final static String CODENAME = "";
     @Deprecated
     public final static String MINECRAFT_VERSION = ProtocolInfo.MINECRAFT_VERSION;

src/main/java/cn/nukkit/network/protocol/ProtocolInfo.java

@@ -126,6 +126,11 @@ public interface ProtocolInfo {
     byte SERVER_SETTINGS_RESPONSE_PACKET = 0x67;
     byte SHOW_PROFILE_PACKET = 0x68;
     byte SET_DEFAULT_GAME_TYPE_PACKET = 0x69;
+    byte REMOVE_OBJECTIVE_PACKET = 0x6a;
+    byte SET_DISPLAY_OBJECTIVE_PACKET = 0x6b;
+    byte SET_SCORE_PACKET = 0x6c;
+    byte LAB_TABLE_PACKET = 0x6d;
+    byte UPDATE_BLOCK_SYNCED_PACKET = 0x6e;
     byte MOVE_ENTITY_DELTA_PACKET = 0x6f;
     byte SET_SCOREBOARD_IDENTITY_PACKET = 0x70;
     byte SET_LOCAL_PLAYER_AS_INITIALIZED_PACKET = 0x71;

src/main/java/cn/nukkit/network/protocol/RemoveObjectivePacket.java

@@ -0,0 +1,26 @@
+package cn.nukkit.network.protocol;
+
+import lombok.ToString;
+
+@ToString
+public class RemoveObjectivePacket extends DataPacket {
+
+    public static final byte NETWORK_ID = ProtocolInfo.REMOVE_OBJECTIVE_PACKET;
+
+    public String objectiveId;
+
+    @Override
+    public byte pid() {
+        return NETWORK_ID;
+    }
+
+    @Override
+    public void decode() {
+    }
+
+    @Override
+    public void encode() {
+        this.reset();
+        this.putString(this.objectiveId);
+    }
+}

src/main/java/cn/nukkit/network/protocol/SetDisplayObjectivePacket.java

@@ -0,0 +1,35 @@
+package cn.nukkit.network.protocol;
+
+import cn.nukkit.scoreboard.Scoreboard;
+import lombok.ToString;
+
+@ToString
+public class SetDisplayObjectivePacket extends DataPacket {
+
+    public static final byte NETWORK_ID = ProtocolInfo.SET_DISPLAY_OBJECTIVE_PACKET;
+
+    public Scoreboard.DisplaySlot displaySlot;
+    public String objectiveId;
+    public String displayName;
+    public String criteria;
+    public Scoreboard.SortOrder sortOrder;
+
+    @Override
+    public byte pid() {
+        return NETWORK_ID;
+    }
+
+    @Override
+    public void decode() {
+    }
+
+    @Override
+    public void encode() {
+        this.reset();
+        this.putString(this.displaySlot.getType());
+        this.putString(this.objectiveId);
+        this.putString(this.displayName);
+        this.putString(this.criteria);
+        this.putVarInt(this.sortOrder.ordinal());
+    }
+}

src/main/java/cn/nukkit/network/protocol/SetScorePacket.java

@@ -0,0 +1,117 @@
+package cn.nukkit.network.protocol;
+
+import it.unimi.dsi.fastutil.objects.ObjectArrayList;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+
+import java.util.List;
+
+@ToString
+public class SetScorePacket extends DataPacket {
+
+    public static final byte NETWORK_ID = ProtocolInfo.SET_SCORE_PACKET;
+
+    public Action action;
+    public final List<ScoreInfo> infos = new ObjectArrayList<>();
+
+    @Override
+    public byte pid() {
+        return NETWORK_ID;
+    }
+
+    @Override
+    public void decode() {
+    }
+
+    @Override
+    public void encode() {
+        this.reset();
+        this.putByte((byte) this.action.ordinal());
+        this.putUnsignedVarInt(this.infos.size());
+
+        for (ScoreInfo info : this.infos) {
+            this.putVarLong(info.scoreboardId);
+            this.putString(info.objectiveId);
+            this.putLInt(info.score);
+
+            if (this.action == Action.SET) {
+                this.putByte((byte) info.type.ordinal());
+
+                switch (info.type) {
+                    case PLAYER:
+                    case ENTITY:
+                        this.putEntityUniqueId(info.entityId);
+                        break;
+                    case FAKE:
+                        this.putString(info.name);
+                        break;
+                    default:
+                        throw new IllegalArgumentException("Invalid score info type");
+                }
+            }
+        }
+    }
+
+    public enum Action {
+        SET,
+        REMOVE
+    }
+
+    @Getter
+    @EqualsAndHashCode
+    @ToString
+    public static class ScoreInfo {
+
+        private final long scoreboardId;
+        private final String objectiveId;
+        private final int score;
+        private final ScorerType type;
+        private final String name;
+        private final long entityId;
+
+        /**
+         * Score info for fake player
+         * @param scoreboardId
+         * @param objectiveId
+         * @param score score
+         * @param name line text
+         */
+        public ScoreInfo(long scoreboardId, String objectiveId, int score, String name) {
+            this.scoreboardId = scoreboardId;
+            this.objectiveId = objectiveId;
+            this.score = score;
+            this.type = ScorerType.FAKE;
+            this.name = name;
+            this.entityId = -1;
+        }
+
+        /**
+         * Score info for player/entity
+         * @param scoreboardId
+         * @param objectiveId
+         * @param type entity type; PLAYER or ENTITY
+         * @param score score
+         * @param entityId entity id
+         */
+        public ScoreInfo(long scoreboardId, String objectiveId, int score, ScorerType type, long entityId) {
+            if (type != ScorerType.PLAYER && type != ScorerType.ENTITY) {
+                throw new IllegalArgumentException("Scorer type must be either PLAYER or ENTITY");
+            }
+
+            this.scoreboardId = scoreboardId;
+            this.objectiveId = objectiveId;
+            this.score = score;
+            this.type = type;
+            this.name = null;
+            this.entityId = entityId;
+        }
+
+        public enum ScorerType {
+            INVALID,
+            PLAYER,
+            ENTITY,
+            FAKE
+        }
+    }
+}