From c784f7b25223f13a5e955e94f4c6725a2a79af0f Mon Sep 17 00:00:00 2001
From: jascotty2 <jascottytechie@gmail.com>
Date: Tue, 27 Aug 2019 08:28:57 -0500
Subject: [PATCH] add nms reflection util, add release info to serverversion

---
 .../core/compatibility/ServerVersion.java     | 33 ++++---
 .../java/com/songoda/core/utils/NMSUtil.java  | 85 +++++++++++++++++++
 2 files changed, 106 insertions(+), 12 deletions(-)
 create mode 100644 src/main/java/com/songoda/core/utils/NMSUtil.java

diff --git a/src/main/java/com/songoda/core/compatibility/ServerVersion.java b/src/main/java/com/songoda/core/compatibility/ServerVersion.java
index c68ef722..d98bef4b 100644
--- a/src/main/java/com/songoda/core/compatibility/ServerVersion.java
+++ b/src/main/java/com/songoda/core/compatibility/ServerVersion.java
@@ -10,23 +10,32 @@ public enum ServerVersion {
     private final static String serverPackagePath = Bukkit.getServer().getClass().getPackage().getName();
     private final static String serverPackageVersion = serverPackagePath.substring(serverPackagePath.lastIndexOf('.') + 1).toUpperCase();
     private static ServerVersion serverVersion = UNKNOWN;
+    private static String serverReleaseVersion;
+
     static {
-        for (ServerVersion version : values())
-            if (serverPackageVersion.startsWith(version.name()))
+        for (ServerVersion version : values()) {
+            if (serverPackageVersion.startsWith(version.name())) {
                 serverVersion = version;
+                serverReleaseVersion = serverPackageVersion.substring(version.name().length() + 2);
+            }
+        }
     }
 
-	public boolean isLessThan(ServerVersion other) {
-		return this.ordinal() < other.ordinal();
-	}
+    public boolean isLessThan(ServerVersion other) {
+        return this.ordinal() < other.ordinal();
+    }
 
-	public boolean isGreaterThan(ServerVersion other) {
-		return this.ordinal() > other.ordinal();
-	}
+    public boolean isGreaterThan(ServerVersion other) {
+        return this.ordinal() > other.ordinal();
+    }
 
-	public static String getServerVersionString() {
-		return serverPackageVersion;
-	}
+    public static String getServerVersionString() {
+        return serverPackageVersion;
+    }
+
+    public static String getVersionReleaseNumber() {
+        return serverReleaseVersion;
+    }
 
     public static ServerVersion getServerVersion() {
         return serverVersion;
@@ -47,4 +56,4 @@ public enum ServerVersion {
     public static boolean isServerVersionBelow(ServerVersion version) {
         return serverVersion.ordinal() < version.ordinal();
     }
-}
\ No newline at end of file
+}
diff --git a/src/main/java/com/songoda/core/utils/NMSUtil.java b/src/main/java/com/songoda/core/utils/NMSUtil.java
new file mode 100644
index 00000000..7075848b
--- /dev/null
+++ b/src/main/java/com/songoda/core/utils/NMSUtil.java
@@ -0,0 +1,85 @@
+package com.songoda.core.utils;
+
+import com.songoda.core.compatibility.ServerVersion;
+import org.bukkit.entity.Player;
+
+import java.lang.reflect.Field;
+
+public class NMSUtil {
+
+    public static Class<?> getNMSClass(String className) {
+        try {
+            String fullName = "net.minecraft.server." + ServerVersion.getServerVersionString() + "." + className;
+            Class<?> clazz = Class.forName(fullName);
+            return clazz;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static Class<?> getCraftClass(String className) {
+        try {
+            String fullName = "org.bukkit.craftbukkit." + ServerVersion.getServerVersionString() + "." + className;
+            Class<?> clazz = Class.forName(fullName);
+            return clazz;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static Field getField(Class<?> clazz, String name, boolean declared) {
+        try {
+            Field field;
+
+            if (declared) {
+                field = clazz.getDeclaredField(name);
+            } else {
+                field = clazz.getField(name);
+            }
+
+            field.setAccessible(true);
+            return field;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static Object getFieldObject(Object object, Field field) {
+        try {
+            return field.get(object);
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static void setField(Object object, String fieldName, Object fieldValue, boolean declared) {
+        try {
+            Field field;
+
+            if (declared) {
+                field = object.getClass().getDeclaredField(fieldName);
+            } else {
+                field = object.getClass().getField(fieldName);
+            }
+
+            field.setAccessible(true);
+            field.set(object, fieldValue);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void sendPacket(Player player, Object packet) {
+        try {
+            Object handle = player.getClass().getMethod("getHandle").invoke(player);
+            Object playerConnection = handle.getClass().getField("playerConnection").get(handle);
+            playerConnection.getClass().getMethod("sendPacket", getNMSClass("Packet")).invoke(playerConnection, packet);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}