Reimplement MC Version Checks and add Warning at Startup.

CommandPanels now warns the owner inside the console if the server runs an unsupported Version

src/me/rockyhawk/commandpanels/CommandPanels.java

@@ -112,6 +112,16 @@ public class CommandPanels extends JavaPlugin{
     public void onEnable() {
         Bukkit.getLogger().info("[CommandPanels] RockyHawk's CommandPanels v" + this.getDescription().getVersion() + " Plugin Loading...");
 
+        // Check if Server is not supported by this version of CP
+        if(MinecraftVersions.lessThanOrEqualTo("1.20.5")){
+            Bukkit.getLogger().warning("======================================================");
+            Bukkit.getLogger().warning("CommandPanels v" + this.getDescription().getVersion() + " is developed for Minecraft 1.20.5 and newer!");
+            Bukkit.getLogger().warning("You're running on: " + Bukkit.getServer().getVersion());
+            Bukkit.getLogger().warning("Please Upgrade the server or downgrade the plugin!");
+            Bukkit.getLogger().warning("You can find other versions of the plugin on: https://commandpanels.net/download");
+            Bukkit.getLogger().warning("======================================================");
+        }
+
         //register config files
         this.blockConfig = YamlConfiguration.loadConfiguration(new File(getDataFolder() + File.separator + "blocks.yml"));
         panelData.dataConfig = YamlConfiguration.loadConfiguration(new File(getDataFolder() + File.separator + "data.yml"));
@@ -519,17 +529,17 @@ public class CommandPanels extends JavaPlugin{
     }
 
     //returns true if the item is the MMO Item
-    public boolean isMMOItem(ItemStack itm, String type, String id){
+    public boolean isMMOItem(ItemStack itm, String type, String id) {
         try {
             if (getServer().getPluginManager().isPluginEnabled("MMOItems")) {
                 NBTItem nbt = NBTItem.get(itm);
-                if (nbt.getType().equalsIgnoreCase(type) && nbt.getString("MMOITEMS_ITEM_ID").equalsIgnoreCase(id)){
+                if (nbt.getType().equalsIgnoreCase(type) && nbt.getString("MMOITEMS_ITEM_ID").equalsIgnoreCase(id)) {
                     return true;
                 }
                 itm.getType();
             }
-        }catch (Exception ex){
+        } catch (Exception ex) {
-            debug(ex,null);
+            debug(ex, null);
         }
         return false;
     }

src/me/rockyhawk/commandpanels/MinecraftVersions.java

@@ -0,0 +1,105 @@
+package me.rockyhawk.commandpanels;
+
+import org.bukkit.Bukkit;
+
+import java.util.Arrays;
+
+public class MinecraftVersions {
+
+    /**
+     * Splits the MC Version in multiple parts and returns them.
+     *
+     * @return String[]
+     */
+    private static String[] getMinecraftVersionParts(){
+        String serverVersion = Bukkit.getServer().getVersion();
+        String[] versionParts = serverVersion.split(" "); // Splitting the version string by space
+        return versionParts[2].split("\\."); // Splitting the Minecraft version by dot
+    }
+
+    /**
+     * Gets the major MC version from the Server
+     * Example: Returns the 20 of 1.20.6.
+     *
+     * @return String
+     */
+    private static String getMajorVersion(){
+        String[] minecraftVersionParts = getMinecraftVersionParts();
+        // Returns the 20 of 1.20.6
+        return minecraftVersionParts[1];
+    }
+
+    /**
+     * Gets the minor MC version from the Server
+     * Example: Returns the 6 of 1.20.6.
+     *
+     * @return String
+     */
+    private static String getMinorVersion(){
+        String[] minecraftVersionParts = getMinecraftVersionParts();
+
+        // Returns the 6 of 1.20.6
+        return minecraftVersionParts[2];
+
+    }
+
+    /**
+     * Checks if the version of the Server is older or on the specified Version.
+     *
+     * @param specifiedVersion The version to check against
+     * @return String
+     */
+    public static boolean lessThanOrEqualTo(String specifiedVersion){
+        // Split the Version into its parts
+        String[] specifiedVersionParts = specifiedVersion.split("\\.");
+
+        // Get the parts from the Version of the Server.
+        // The .replace turns 1.20.4) into 1.20.4
+        int serverMajorVersion = Integer.parseInt(String.valueOf(getMajorVersion()).replace(")", ""));
+        int serverMinorVersion = Integer.parseInt(String.valueOf(getMinorVersion()).replace(")", ""));
+
+        // Get the parts from the specified version
+        int specifiedMajorVersion = Integer.parseInt(specifiedVersionParts[1]);
+        int specifiedMinorVersion = Integer.parseInt(specifiedVersionParts[2]);
+
+        // If Major version is less or equal than the specified version.
+        if(serverMajorVersion < specifiedMajorVersion){
+            return true;
+        } // If Major version equal and Minor Version is less or equal than specified version.
+        else if (serverMajorVersion == specifiedMajorVersion && serverMinorVersion <= specifiedMinorVersion) {
+            return true;
+        }else{
+            return false;
+        }
+    }
+
+    /**
+     * Checks if the version of the Server is newer or on the specified Version.
+     *
+     * @param specifiedVersion The version to check against
+     * @return String
+     */
+    public static boolean greaterThanOrEqualTo(String specifiedVersion){
+        // Split the Version into its parts
+        String[] specifiedVersionParts = specifiedVersion.split("\\.");
+
+        // Get the parts from the Version of the Server
+        // The .replace turns 1.20.4) into 1.20.4
+        int serverMajorVersion = Integer.parseInt(String.valueOf(getMajorVersion()).replace(")", ""));
+        int serverMinorVersion = Integer.parseInt(String.valueOf(getMinorVersion()).replace(")", ""));
+
+        // Get the parts from the specified version
+        int specifiedMajorVersion = Integer.parseInt(specifiedVersionParts[1]);
+        int specifiedMinorVersion = Integer.parseInt(specifiedVersionParts[2]);
+
+        // If Major version is less or equal than the specified version.
+        if(serverMajorVersion > specifiedMajorVersion){
+            return true;
+        } // If Major version equal and Minor Version is less or equal than specified version.
+        else if (serverMajorVersion == specifiedMajorVersion && serverMinorVersion >= specifiedMinorVersion) {
+            return true;
+        }else{
+            return false;
+        }
+    }
+}