Simplify sleep Command

Simplify further command additions

BauSystem_Main/src/de/steamwar/bausystem/world/ScriptListener.java

@@ -32,7 +32,6 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.BookMeta;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.logging.Level;
 
@@ -40,7 +39,35 @@ public class ScriptListener implements Listener {
 
     private static final String scriptPrefix = "§eScriptSystem§8» §7";
 
-    @EventHandler
+    private static final List<ScriptCommand> scriptCommands = new ArrayList<>();
+
+    static {
+        scriptCommands.add(new ScriptCommand() {
+            @Override
+            public String command() {
+                return "sleep";
+            }
+
+            @Override
+            public boolean execute(ScriptExecutor scriptExecutor, String[] args) {
+                int sleepTime = 1;
+                if (args.length > 0) {
+                    try {
+                        sleepTime = Integer.parseInt(args[0]);
+                        if (sleepTime <= 0) {
+                            scriptExecutor.player.sendMessage(scriptPrefix + "Sleep kleiner gleich 0, default 1 GameTick");
+                            sleepTime = 1;
+                        }
+                    } catch (NumberFormatException e) {
+                        scriptExecutor.player.sendMessage(scriptPrefix + "Sleep ohne Zahl, default 1 GameTick");
+                    }
+                }
+                Bukkit.getScheduler().runTaskLater(BauSystem.getPlugin(), scriptExecutor::resume, sleepTime);
+                return false;
+            }
+        });
+    }
+
     public void onLeftClick(PlayerInteractEvent event) {
         if(event.getAction() != Action.LEFT_CLICK_AIR && event.getAction() != Action.LEFT_CLICK_BLOCK)
             return;
@@ -75,9 +102,11 @@ public class ScriptListener implements Listener {
             for(String page : bookMeta.getPages()) {
                 for (String command : page.split("\n")) {
                     if (command.startsWith("#")) continue;
+                    if (command.trim().isEmpty()) continue;
                     commands.add(command);
                 }
             }
+            if (commands.isEmpty()) return;
             resume();
         }
 
@@ -89,24 +118,11 @@ public class ScriptListener implements Listener {
             while (index < commands.size()) {
                 String command = commands.get(index++);
 
-                if (command.contains(" ")) {
-                    String[] strings = command.split(" ");
-                    if (strings.length > 0) {
-                        if (strings[0].equalsIgnoreCase("sleep")) {
-                            int sleepTime = 1;
-                            if (strings.length > 1) {
-                                try {
-                                    sleepTime = Integer.parseInt(strings[1]);
-                                    if (sleepTime <= 0) {
-                                        player.sendMessage(scriptPrefix + "Sleep kleiner gleich 0, default 1 GameTick");
-                                        sleepTime = 1;
-                                    }
-                                } catch (NumberFormatException e) {
-                                    player.sendMessage(scriptPrefix + "Sleep ohne Zahl, default 1 GameTick");
-                                }
-                            }
-                            Bukkit.getScheduler().runTaskLater(BauSystem.getPlugin(), this::resume, sleepTime);
-                            break;
+                for (ScriptCommand scriptCommand : scriptCommands) {
+                    if (command.toLowerCase().startsWith(scriptCommand.command())) {
+                        String[] args = command.substring(scriptCommand.command().length() + 1).split(" ");
+                        if (!scriptCommand.execute(this, args)) {
+                            return;
                         }
                     }
                 }
@@ -114,8 +130,6 @@ public class ScriptListener implements Listener {
                 PlayerCommandPreprocessEvent preprocessEvent = new PlayerCommandPreprocessEvent(player, "/" + command);
                 Bukkit.getServer().getPluginManager().callEvent(preprocessEvent);
                 if (preprocessEvent.isCancelled()) {
-                    player.sendMessage(scriptPrefix + "Befehl konnte nicht ausgeführt werden:");
-                    player.sendMessage(scriptPrefix + command);
                     continue;
                 }
 
@@ -126,4 +140,15 @@ public class ScriptListener implements Listener {
 
     }
 
+    private interface ScriptCommand {
+
+        String command();
+
+        /**
+         * Should return {@code true} if execution should not stop, {@code false} otherwise.
+         */
+        boolean execute(ScriptExecutor scriptExecutor, String[] args);
+
+    }
+
 }