Changed String for guids to its value object

broker/src/main/java/io/moquette/spi/MessageGUID.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2012-2015 The original author or authors
+ * ------------------------------------------------------
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Apache License v2.0 which accompanies this distribution.
+ *
+ * The Eclipse Public License is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * The Apache License v2.0 is available at
+ * http://www.opensource.org/licenses/apache2.0.php
+ *
+ * You may elect to redistribute this code under either of these licenses.
+ */
+package io.moquette.spi;
+
+import java.io.Serializable;
+
+/**
+ * Value object for GUIDs of messages.
+ * */
+public class MessageGUID implements Serializable {
+    private final String guid;
+
+    public MessageGUID(String guid) {
+        this.guid = guid;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        MessageGUID that = (MessageGUID) o;
+
+        return guid != null ? guid.equals(that.guid) : that.guid == null;
+
+    }
+
+    @Override
+    public int hashCode() {
+        return guid != null ? guid.hashCode() : 0;
+    }
+
+    @Override
+    public String toString() {
+        return "MessageGUID{" +
+                "guid='" + guid + '\'' +
+                '}';
+    }
+}