v2.0.1 - Hex color support

Common/src/main/java/net/frankheijden/serverutils/common/utils/HexUtils.java

@@ -0,0 +1,43 @@
+package net.frankheijden.serverutils.common.utils;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Provides basic conversion between the hex format <#FFFFFF> and bukkit hex format &x&F&F&F&F&F&F.
+ */
+public class HexUtils {
+
+    private static final Pattern hexPattern = Pattern.compile("<(#[0-9a-fA-F]{6})>");
+    private static final char COLOR_CHAR = '&';
+
+    /**
+     * Prefixes each character provided with the color character {@link #COLOR_CHAR}.
+     * @param color The color to prefix with the color character.
+     * @return The prefixed color.
+     */
+    public static String convertHexColor(String color) {
+        StringBuilder sb = new StringBuilder(2 * (color.length() + 1)).append(COLOR_CHAR).append("x");
+        for (char c : color.toCharArray()) {
+            sb.append(COLOR_CHAR).append(c);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * Converts the input string to a bukkit readable color string.
+     * The accepted hex format is `<#FFFFFF>`.
+     * @param str The input string.
+     * @return The output converted hex string.
+     */
+    public static String convertHexString(String str) {
+        StringBuffer sb = new StringBuffer(str.length());
+        Matcher matcher = hexPattern.matcher(str);
+        while (matcher.find()) {
+            String hex = matcher.group();
+            matcher.appendReplacement(sb, convertHexColor(hex.substring(2, hex.length() - 1)));
+        }
+        matcher.appendTail(sb);
+        return sb.toString();
+    }
+}