feat: remove methods for function and constant manager + exception when registering a function or constant that already exists

Author: MEFRREEX

api/src/main/java/com/instancify/scriptify/api/script/constant/ScriptConstantManager.java

@@ -32,4 +32,11 @@ public interface ScriptConstantManager {
      * @param constant The constant to be registered
      */
     void register(ScriptConstant constant);
+
+    /**
+     * Removes an existing constant in the manager.
+     *
+     * @param name The name of the constant to remove
+     */
+    void remove(String name);
 }

api/src/main/java/com/instancify/scriptify/api/script/function/ScriptFunctionManager.java

@@ -32,4 +32,11 @@ public interface ScriptFunctionManager {
      * @param function The function to be registered
      */
     void register(ScriptFunction function);
+
+    /**
+     * Removes an existing function in the manager.
+     *
+     * @param name The name of the function to remove
+     */
+    void remove(String name);
 }

core/src/main/java/com/instancify/scriptify/core/script/constant/StandardConstantManager.java

@@ -24,6 +24,19 @@ public Map<String, ScriptConstant> getConstants() {
 
     @Override
     public void register(ScriptConstant constant) {
-        constants.put(constant.getName(), constant);
+        if (!constants.containsKey(constant.getName())) {
+            constants.put(constant.getName(), constant);
+        } else {
+            throw new IllegalStateException("The constant with this name already exists");
+        }
+    }
+
+    @Override
+    public void remove(String name) {
+        if (constants.containsKey(name)) {
+            constants.remove(name);
+        } else {
+            throw new IllegalArgumentException("The constant with this name does not exist");
+        }
     }
 }

core/src/main/java/com/instancify/scriptify/core/script/function/StandardFunctionManager.java

@@ -60,6 +60,19 @@ public Map<String, ScriptFunction> getFunctions() {
 
     @Override
     public void register(ScriptFunction function) {
-        functions.put(function.getName(), function);
+        if (!functions.containsKey(function.getName())) {
+            functions.put(function.getName(), function);
+        } else {
+            throw new IllegalStateException("The function with this name already exists");
+        }
+    }
+
+    @Override
+    public void remove(String name) {
+        if (functions.containsKey(name)) {
+            functions.remove(name);
+        } else {
+            throw new IllegalArgumentException("The function with this name does not exist");
+        }
     }
 }