operation.setOperand(feedMapping);
operation.setOperator(Operator.ADD);
// Save the field mapping.
FeedMappingReturnValue result =
feedMappingService.mutate(new FeedMappingOperation[] {operation});
for (FeedMapping savedFeedMapping : result.getValue()) {
System.out.printf(
"Feed mapping with id %d and placeholderType %d was saved for feed with id %d.\n",
savedFeedMapping.getFeedMappingId(), savedFeedMapping.getPlaceholderType(),
savedFeedMapping.getFeedId());