Missed in prev commit

parser/src/main/java/org/dna/mqtt/moquette/messaging/spi/impl/SubscriptionsStore.java

@@ -0,0 +1,39 @@
+package org.dna.mqtt.moquette.messaging.spi.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Represents a tree of published topics
+ *
+ * @author andrea
+ */
+public class SubscriptionsStore {
+
+    private List<Subscription> subscriptions = new ArrayList<Subscription>();
+
+    public void add(Subscription newSubscription) {
+        if (subscriptions.contains(newSubscription)) {
+            return;
+        }
+        subscriptions.add(newSubscription);
+    }
+
+    public List<Subscription> matches(String topic) {
+        List<Subscription> m = new ArrayList<Subscription>();
+        for (Subscription sub : subscriptions) {
+            if (sub.match(topic)) {
+                m.add(sub);
+            }
+        }
+        return m;
+    }
+
+    public boolean contains(Subscription sub) {
+        return subscriptions.contains(sub);
+    }
+
+    public int size() {
+        return subscriptions.size();
+    }
+}