[Java] Add bitset support to JsonPrinter. Issue #560.

Author: mjpt777

sbe-tool/src/main/java/uk/co/real_logic/sbe/json/JsonTokenListener.java

@@ -106,6 +106,29 @@ public void onBitSet(
         final int toIndex,
         final int actingVersion)
     {
+        final Token typeToken = tokens.get(fromIndex + 1);
+        final long encodedValue = readEncodingAsLong(buffer, bufferIndex, typeToken, actingVersion);
+
+        property(fieldToken);
+
+        output.append("{ ");
+        for (int i = fromIndex + 1; i < toIndex; i++)
+        {
+            output.append('"').append(tokens.get(i).name()).append("\": ");
+
+            final long bitPosition = tokens.get(i).encoding().constValue().longValue();
+            final boolean flag = (encodedValue & (1L << bitPosition)) != 0;
+
+            output.append(Boolean.toString(flag));
+
+            if (i < (toIndex - 1))
+            {
+                output.append(", ");
+            }
+        }
+        output.append(" }");
+
+        next();
     }
 
     public void onBeginComposite(

sbe-tool/src/test/java/uk/co/real_logic/sbe/json/JsonPrinterTest.java

@@ -61,6 +61,7 @@ public void exampleMessagePrintedAsJson() throws Exception
             "    \"code\": \"A\",\n" +
             "    \"someNumbers\": [0, 1, 2, 3, 4],\n" +
             "    \"vehicleCode\": \"abcdef\",\n" +
+            "    \"extras\": { \"sunRoof\": false, \"sportsPack\": true, \"cruiseControl\": true },\n" +
             "    \"capacity\": 2000,\n" +
             "    \"numCylinders\": 4,\n" +
             "    \"maxRpm\": 9000,\n" +