Implemented FilterTree

src/de/steamwar/bungeecore/chat/ChatFilter.java

@@ -0,0 +1,4 @@
+package de.steamwar.bungeecore.chat;
+
+public class ChatFilter {
+}

src/de/steamwar/bungeecore/chat/FilterTree.java

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+/*
+ *   This file is a part of the SteamWar software.
+ *
+ *   Copyright (C) 2024  SteamWar.de-Serverteam
+ *
+ *   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.steamwar.bungeecore.chat;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class FilterTree {
+    /**
+     * Root of this prefix tree
+     */
+    final private TreeNode root = new TreeNode();
+
+    /**
+     * Embeds the given word into the tree
+     *
+     * @param word  the word to embed
+     * @param value the value given to this word
+     */
+    public void addWord(@NotNull String word, int value) {
+        char[] chars = word.toCharArray();
+
+        TreeNode current = root;
+        for (char c : chars) {
+            if (current.children.containsKey(c)) {
+                current = current.children.get(c);
+            } else {
+                TreeNode next = new TreeNode();
+                current.children.put(c, next);
+                current = next;
+            }
+        }
+
+        current.value = value;
+    }
+
+    /**
+     * Uses the tree to find the value that should be assigned to
+     * the given word
+     *
+     * @param word the word to evaluate
+     * @return the value assigned to the given word
+     */
+    public int evaluateWord(@NotNull String word) {
+        char[] chars = word.toCharArray();
+
+        int value = 0;
+        TreeNode current = root;
+        for (char c : chars) {
+            if (current.children.containsKey(c)) {
+                current = current.children.get(c);
+                value += current.value;
+            } else {
+                break;
+            }
+        }
+
+        return value;
+    }
+
+    static class TreeNode {
+        final Map<Character, TreeNode> children = new HashMap<>();
+        int value;
+    }
+}