Add Tristate type

base/src/main/java/de/staropensource/sosengine/base/classes/types/Tristate.java

@@ -0,0 +1,49 @@
+/*
+ * STAROPENSOURCE ENGINE SOURCE FILE
+ * Copyright (c) 2024 The StarOpenSource Engine Contributors
+ * Licensed under the GNU Affero General Public License v3
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.staropensource.sosengine.base.classes.types;
+
+/**
+ * tl;dr just a boolean but it can be UNSET too.
+ *
+ * @since 1-alpha1
+ */
+@SuppressWarnings({ "unused" })
+public enum Tristate {
+    /**
+     * Indicates that something is unset.
+     *
+     * @since 1-alpha1
+     */
+    UNSET,
+
+    /**
+     * Indicates that something is true.
+     *
+     * @since 1-alpha1
+     */
+    TRUE,
+
+    /**
+     * Indicates that something is false.
+     *
+     * @since 1-alpha1
+     */
+    FALSE
+}