add VersionUtils

lib/src/main/java/me/hsgamer/mcserverupdater/util/VersionUtils.java

@@ -0,0 +1,23 @@
+package me.hsgamer.mcserverupdater.util;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class VersionUtils {
+    private static final Pattern VERSION_REGEX = Pattern.compile("(\\d+)\\.(\\d+)(\\.(\\d+))?");
+
+    public static boolean isAtLeast(String version, int major, int minor) {
+        Matcher matcher = VERSION_REGEX.matcher(version);
+        if (!matcher.find()) {
+            return false;
+        }
+        int majorVersion = Integer.parseInt(matcher.group(2));
+        int minorVersion = Integer.parseInt(matcher.group(4));
+
+        return majorVersion > major || (majorVersion == major && minorVersion >= minor);
+    }
+
+    public static boolean isMojmapDefault(String version) {
+        return isAtLeast(version, 20, 5);
+    }
+}