broker/Topic: class added

broker/Topic: String Topics replaced by Topic class
broker/Topic#parseTopic: access set to private
broker/SubscriptionsStoreTest: topic tests moved to own class
broker/TopicTest: containsExactly used
broker/TopicTest: TopicAssert class added
broker/TopicTest$TopicAssert#containsToken: method added
broker/TopicTest$TopicAssert#matches: method added

broker/src/main/java/io/moquette/spi/impl/Qos0PublishHandler.java

@@ -5,6 +5,7 @@ import io.moquette.server.netty.NettyUtils;
 import io.moquette.spi.IMessagesStore;
 import io.moquette.spi.impl.subscriptions.Subscription;
 import io.moquette.spi.impl.subscriptions.SubscriptionsStore;
+import io.moquette.spi.impl.subscriptions.Topic;
 import io.moquette.spi.security.IAuthorizator;
 import io.netty.channel.Channel;
 import io.netty.handler.codec.mqtt.MqttPublishMessage;
@@ -33,7 +34,7 @@ class Qos0PublishHandler extends QosPublishHandler {
 
     void receivedPublishQos0(Channel channel, MqttPublishMessage msg) {
         // verify if topic can be write
-        final String topic = msg.variableHeader().topicName();
+        final Topic topic = new Topic(msg.variableHeader().topicName());
         if (checkWriteOnTopic(topic, channel)) {
             return;
         }