Merge pull request #480 from thatsIch/uuid

Fixes #473, catches outdated player names and checks if all entries are UUIDs before converted and thus prevents the server crashing.

src/main/java/appeng/util/UUIDMatcher.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of Applied Energistics 2.
+ * Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
+ *
+ * Applied Energistics 2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Applied Energistics 2 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
+ */
+
+package appeng.util;
+
+
+/**
+ * Regex wrapper for UUIDs to not rely on try catch
+ */
+public final class UUIDMatcher
+{
+	/**
+	 * String which is the regular expression for UUIDs
+	 */
+	private static final String UUID_REGEX = "[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}";
+
+	/**
+	 * Checks if a potential UUID is an UUID by applying a regular expression on it.
+	 *
+	 * @param potential to be checked potential UUID
+	 *
+	 * @return true, if the potential UUID is indeed an UUID
+	 */
+	public boolean isUUID( String potential )
+	{
+		return potential.matches( UUID_REGEX );
+	}
+}