[Java] Generate javadoc for group encode properties as part of Issues #22 and #289.

Author: mjpt777

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/java/JavaGenerator.java

@@ -633,11 +633,13 @@ private CharSequence generateGroupEncoderProperty(final String groupName, final
 
         sb.append(String.format(
             "\n" +
-            indent + "    public %1$s %2$sCount(final int count)\n" +
+            "%1$s" +
+            indent + "    public %2$s %3$sCount(final int count)\n" +
             indent + "    {\n" +
-            indent + "        %2$s.wrap(parentMessage, buffer, count);\n" +
-            indent + "        return %2$s;\n" +
+            indent + "        %3$s.wrap(parentMessage, buffer, count);\n" +
+            indent + "        return %3$s;\n" +
             indent + "    }\n",
+            generateGroupEncodePropertyJavadoc(indent + INDENT, token, className),
             className,
             propertyName));
 

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/java/JavaUtil.java

@@ -318,7 +318,7 @@ public static String generateOptionEncodeJavadoc(final String indent, final Toke
     }
 
     /**
-     * Generate the Javadoc comment header for a bitset choice option decode method.
+     * Generate the Javadoc comment header for flyweight property.
      *
      * @param indent        level for the comment.
      * @param propertyToken for the property name.
@@ -341,4 +341,30 @@ public static String generateFlyweightPropertyJavadoc(
             indent + " * @return " + typeName + " : " + description + "\n" +
             indent + " */\n";
     }
+
+    /**
+     * Generate the Javadoc comment header for group encode property.
+     *
+     * @param indent        level for the comment.
+     * @param propertyToken for the property name.
+     * @param typeName      for the property type.
+     * @return a string representation of the Javadoc comment.
+     */
+    public static String generateGroupEncodePropertyJavadoc(
+        final String indent, final Token propertyToken, final String typeName)
+    {
+        final String description = propertyToken.description();
+        if (null == description || description.isEmpty())
+        {
+            return "";
+        }
+
+        return
+            indent + "/**\n" +
+            indent + " * " + description + "\n" +
+            indent + " *\n" +
+            indent + " * @param count of times the group will be encoded\n" +
+            indent + " * @return " + typeName + " : encoder for the group\n" +
+            indent + " */\n";
+    }
 }