@Override
public Comment getComment(String commentId) {
FirebaseSyncRequester<Comment> commentRequester = newFirebaseSyncRequesterForComment(commentId);
if (!commentRequester.exists()) {
throw new IllegalArgumentException("Comment does not exist");
}
return commentRequester.get();
}
@Override
public String[] getCategories() {
Firebase fb = new Firebase(FIREBASE_CATEGORIES_URL);
FirebaseSyncRequester<Map> categoriesRequester = new FirebaseSyncRequester<>(fb, Map.class);
Map<String, Boolean> categoryMap = categoriesRequester.get();
return categoryMap.keySet().toArray(new String[categoryMap.size()]);
}
@Override
public Comment downvoteComment(String commentId) {
Firebase commentFirebaseRef = newFirebaseRefForComment(commentId);
FirebaseSyncRequester<Comment> commentRequester =
new FirebaseSyncRequester<>(commentFirebaseRef, Comment.class);
Comment downvotedComment = null;
if (commentRequester.exists()) {
downvotedComment = newDownvotedComment(commentRequester.get());
commentFirebaseRef.setValue(newDownvotedComment(downvotedComment));
} else {
throw new IllegalArgumentException("Comment with id " + commentId + " does not exist");
}
return downvotedComment;
}
@Override
public Comment deleteComment(String commentId) {
Firebase firebaseCommentRef = newFirebaseRefForComment(commentId);
FirebaseSyncRequester<Comment> commentRequester =
new FirebaseSyncRequester<>(firebaseCommentRef, Comment.class);
Comment commentToReturn = null;
if (commentRequester.exists()) {
final CountDownLatch latch = new CountDownLatch(1);
firebaseCommentRef.removeValue(
new Firebase.CompletionListener() {
@Override
public void onComplete(FirebaseError firebaseError, Firebase firebase) {
if (firebaseError != null) {
throw firebaseError.toException();
}
latch.countDown();
}
});
try {
latch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
commentToReturn = commentRequester.get();
} else {
throw new IllegalArgumentException("Comment with id " + commentId + " does not exist.");
}
return commentToReturn;
}
/**
* Determines if the post that was passed to FirebaseCommentProvider#startCheckingIfPostExists()
* does exists. This method waits for the post to be downloaded.
*
* @return true if it exists, false otherwise
*/
private boolean finishCheckingIfPostExists() {
return requesterForCheckingPost.exists();
}
