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package org.wordpress.android.ui.reader.actions;
import org.wordpress.android.models.ReaderBlog;
import org.wordpress.android.models.ReaderComment;
/**
* classes in this package serve as a middleman between local data and server data - used by
* reader activities/fragments/adapters that wish to perform actions on posts, blogs & topics,
* or wish to get the latest data from the server.
*
* methods in this package which change state (like, follow, etc.) are generally optimistic
* and work like this:
*
* 1. caller asks method to send a network request which changes state
* 2. method changes state in local data and returns to caller *before* network request completes
* 3. caller can access local state change without waiting for the network request
* 4. if the network request fails, the method restores the previous state of the local data
* 5. if caller passes a listener, it can be alerted to the actual success/failure of the request
*
* note that all methods MUST be called from the UI thread in order to guarantee that listeners
* are alerted on the UI thread
*/
public class ReaderActions {
private ReaderActions() {
throw new AssertionError();
}
/*
* listener when a specific action is performed (liking a post, etc.)
*/
public interface ActionListener {
void onActionResult(boolean succeeded);
}
/*
* helper routine for telling an action listener the call succeeded or failed w/o having to null check
*/
public static void callActionListener(ActionListener actionListener, boolean succeeded) {
if (actionListener != null) {
actionListener.onActionResult(succeeded);
}
}
/*
* listener when the failure status code is required
*/
public interface OnRequestListener {
void onSuccess();
void onFailure(int statusCode);
}
/*
* listener when submitting a comment
*/
public interface CommentActionListener {
void onActionResult(boolean succeeded, ReaderComment newComment);
}
/*
* result when updating data (getting latest posts or comments for a post, etc.)
*/
public enum UpdateResult {
HAS_NEW, // new posts/comments/etc. have been retrieved
CHANGED, // no new posts/comments, but existing ones have changed
UNCHANGED, // no new or changed posts/comments
FAILED; // request failed
public boolean isNewOrChanged() {
return (this == HAS_NEW || this == CHANGED);
}
}
public interface UpdateResultListener {
void onUpdateResult(UpdateResult result);
}
/*
* used by adapters to notify when more data should be loaded
*/
public interface DataRequestedListener {
void onRequestData();
}
/*
* used by blog preview when requesting latest info about a blog
*/
public interface UpdateBlogInfoListener {
void onResult(ReaderBlog blogInfo);
}
}
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