code: private ManagedSchema getManagedSchemaFromSchemaMap(String tableName,
        String entityName) {
      return getManagedSchemaMap().get(
          getManagedSchemaMapKey(tableName, entityName));
    }
docs: Get the managed schema from the managedSchemaMap, using the
  getManagedSchemaMap() accessor.
  
  @param tableName
  The table name of the managed schema
  @param entityName
  The entity name of the managed schema
  @return The ManagedSchema instance, or null if one doesn't exist.