Added check of not empty subtopics in splitTopics method

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

@@ -1,5 +1,6 @@
 package org.dna.mqtt.moquette.messaging.spi.impl;
 
+import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -11,7 +12,21 @@ import java.util.List;
 public class SubscriptionsStore {
     
     protected static class Token {
-
+    
+        static final Token EMPTY = new Token("");
+        static final Token MULTI = new Token("#");
+        static final Token SINGLE = new Token("+");
+        
+        String name;
+        
+        protected Token(String s) {
+            name = s;
+        }
+        
+        protected String name() {
+            return name;
+        }
+        
         @Override
         public int hashCode() {
             int hash = 7;
@@ -33,14 +48,6 @@ public class SubscriptionsStore {
             }
             return true;
         }
-        String name;
-        protected Token(String s) {
-            name = s;
-        }
-        
-        protected String name() {
-            return name;
-        }
     }
 
     private List<Subscription> subscriptions = new ArrayList<Subscription>();
@@ -70,10 +77,20 @@ public class SubscriptionsStore {
         return subscriptions.size();
     }
     
-    protected List<Token> splitTopic(String topic) {
+    protected List<Token> splitTopic(String topic) throws ParseException {
         List res = new ArrayList<Token>();
-        for (String s : topic.split("/")) {
+        String[] splitted = topic.split("/");
-            res.add(new Token(s));
+        
+        for (int i=0; i<splitted.length; i++) {
+            String s = splitted[i];
+            if (s.isEmpty()) {
+                if (i != 0){
+                    throw new ParseException("Bad format of topic, expetec toppic name between separators", i);
+                }
+                res.add(Token.EMPTY);
+            } else {
+                res.add(new Token(s));
+            }
         }
         
         return res;

parser/src/test/java/org/dna/mqtt/moquette/messaging/spi/impl/SubscriptionsStoreTest.java

@@ -1,11 +1,12 @@
 package org.dna.mqtt.moquette.messaging.spi.impl;
 
+import java.text.ParseException;
 import java.util.Arrays;
 import java.util.List;
 import org.dna.mqtt.moquette.messaging.spi.impl.SubscriptionsStore.Token;
-import org.junit.Test;
 import static org.junit.Assert.*;
 import org.junit.Before;
+import org.junit.Test;
 
 /**
  *
@@ -24,9 +25,18 @@ public class SubscriptionsStoreTest {
     }
 
     @Test
-    public void testSplitTopic() {
+    public void testSplitTopic() throws ParseException {
-        List<Token> result = store.splitTopic("finance/stock/ibm");
+        List tokens = store.splitTopic("finance/stock/ibm");
-        assertEqualsSeq(asArray("finance", "stock", "ibm"), result);
+        assertEqualsSeq(asArray("finance", "stock", "ibm"), tokens);
+        
+        tokens = store.splitTopic("/finance/stock/ibm");
+        assertEqualsSeq(asArray(Token.EMPTY, "finance", "stock", "ibm"), tokens);
+    }
+    
+    
+    @Test(expected = ParseException.class)
+    public void testSplitTopicTwinsSlashAvoided() throws ParseException {
+        store.splitTopic("/finance//stock/ibm");
     }
     
     private static Token[] asArray(Object... l) {