From cf09a70fb88966a3da8d236fd1fe9bcce0515896 Mon Sep 17 00:00:00 2001
From: Lars Simon Winzer <lars.winzer@stud.unibas.ch>
Date: Wed, 8 Apr 2026 16:49:47 +0200
Subject: [PATCH] Add: Change CommandHandler to abstract class and add support
 for pre-execution checks

---
 .../command/execution/CommandHandler.java      | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/command/execution/CommandHandler.java b/src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/command/execution/CommandHandler.java
index 0fdae3c..f6c1a58 100644
--- a/src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/command/execution/CommandHandler.java
+++ b/src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/command/execution/CommandHandler.java
@@ -1,7 +1,21 @@
 package ch.unibas.dmi.dbis.cs108.casono.server.network.command.execution;
 
+import ch.unibas.dmi.dbis.cs108.casono.server.network.command.execution.checks.HandlerCheck;
 import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.Request;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
-public interface CommandHandler<T extends Request> {
-    void execute(T request);
+public abstract class CommandHandler<T extends Request> {
+    private final List<HandlerCheck> checks = new ArrayList<>();
+
+    protected final void addCheck(HandlerCheck check) {
+        checks.add(check);
+    }
+
+    public final List<HandlerCheck> getChecks() {
+        return Collections.unmodifiableList(checks);
+    }
+
+    public void execute(T request) {}
 }