/**
* Use cursors to fetch upto jtwit.maxResults TODO More controlled paging??
*
* @param url API method to call
* @param screenName
* @param userId
* @return twitter-id numbers for friends/followers of screenName or userId Is affected by {@link
* #maxResults}
*/
private List<Number> getUserIDs(String url, String screenName, Long userId) {
Long cursor = -1L;
List<Number> ids = new ArrayList<Number>();
if (screenName != null && userId != null)
throw new IllegalArgumentException(
"cannot use both screen_name and user_id when fetching user_ids");
Map<String, String> vars = InternalUtils.asMap("screen_name", screenName, "user_id", userId);
while (cursor != 0 && !jtwit.enoughResults(ids)) {
vars.put("cursor", String.valueOf(cursor));
String json = http.getPage(url, vars, http.canAuthenticate());
try {
// it seems Twitter will occasionally return a raw array
JSONArray jarr;
if (json.charAt(0) == '[') {
jarr = new JSONArray(json);
cursor = 0L;
} else {
JSONObject jobj = new JSONObject(json);
jarr = (JSONArray) jobj.get("ids");
cursor = new Long(jobj.getString("next_cursor"));
}
for (int i = 0; i < jarr.length(); i++) {
ids.add(jarr.getLong(i));
}
if (jarr.length() == 0) {
// No more
break;
}
} catch (JSONException e) {
throw new TwitterException.Parsing(json, e);
}
}
return ids;
}
/**
* @return true if followerScreenName <i>is</i> following followedScreenName
* @throws TwitterException.E403 if one of the users has protected their updates and you don't
* have access. This can be counter-intuitive (and annoying) at times! Also throws E403 if one
* of the users has been suspended (we use the {@link SuspendedUser} exception sub-class for
* this).
* @throws TwitterException.E404 if one of the users does not exist
*/
public boolean isFollower(String followerScreenName, String followedScreenName) {
assert followerScreenName != null && followedScreenName != null;
try {
Map vars =
InternalUtils.asMap(
"source_screen_name", followerScreenName,
"target_screen_name", followedScreenName);
String page =
http.getPage(jtwit.TWITTER_URL + "/friendships/show.json", vars, http.canAuthenticate());
JSONObject jo = new JSONObject(page);
JSONObject trgt = jo.getJSONObject("relationship").getJSONObject("target");
boolean fby = trgt.getBoolean("followed_by");
return fby;
} catch (TwitterException.E403 e) {
if (e instanceof SuspendedUser) throw e;
// Should this be a suspended user exception instead?
// Let's ask Twitter
// TODO check rate limits - only do if we have spare capacity
String whoFirst =
followedScreenName.equals(jtwit.getScreenName())
? followerScreenName
: followedScreenName;
try {
// this could throw a SuspendedUser exception
show(whoFirst);
String whoSecond =
whoFirst.equals(followedScreenName) ? followerScreenName : followedScreenName;
if (whoSecond.equals(jtwit.getScreenName())) throw e;
show(whoSecond);
} catch (TwitterException.RateLimit e2) {
// ignore
}
// both shows worked?
throw e;
} catch (TwitterException e) {
// FIXME investigating a weird new bug
if (e.getMessage() != null
&& e.getMessage().contains("Two user ids or screen_names must be supplied"))
throw new TwitterException(
"WTF? inputs: follower="
+ followerScreenName
+ ", followed="
+ followedScreenName
+ ", call-by="
+ jtwit.getScreenName()
+ "; "
+ e.getMessage());
throw e;
}
}
/**
* Write the contents of the JSONObject as JSON text to a writer. For compactness, no whitespace
* is added.
*
* <p>Warning: This method assumes that the data structure is acyclical.
*
* @return The writer.
* @throws JSONException
*/
public Writer write(Writer writer) throws JSONException {
try {
boolean b = false;
Iterator keys = keys();
writer.write('{');
while (keys.hasNext()) {
if (b) {
writer.write(',');
}
Object k = keys.next();
writer.write(quote(k.toString()));
writer.write(':');
Object v = this.myHashMap.get(k);
if (v instanceof JSONObject) {
((JSONObject) v).write(writer);
} else if (v instanceof JSONArray) {
((JSONArray) v).write(writer);
} else {
writer.write(valueToString(v));
}
b = true;
}
writer.write('}');
return writer;
} catch (IOException e) {
throw new JSONException(e);
}
}
/**
* Low-level method for fetching e.g. your friends
*
* @param url
* @param screenName e.g. your screen-name
* @return
*/
private List<User> getUsers(String url, String screenName) {
Map<String, String> vars = InternalUtils.asMap("screen_name", screenName);
List<User> users = new ArrayList<User>();
Long cursor = -1L;
while (cursor != 0 && !jtwit.enoughResults(users)) {
vars.put("cursor", cursor.toString());
JSONObject jobj;
try {
jobj = new JSONObject(http.getPage(url, vars, http.canAuthenticate()));
users.addAll(User.getUsers(jobj.getString("users")));
cursor = new Long(jobj.getString("next_cursor"));
} catch (JSONException e) {
throw new TwitterException.Parsing(null, e);
}
}
return users;
}
/**
* Construct a JSONObject from a subset of another JSONObject. An array of strings is used to
* identify the keys that should be copied. Missing keys are ignored.
*
* @param jo A JSONObject.
* @param sa An array of strings.
* @exception JSONException If a value is a non-finite number.
*/
public JSONObject(JSONObject jo, String[] sa) throws JSONException {
this();
for (int i = 0; i < sa.length; i += 1) {
putOpt(sa[i], jo.opt(sa[i]));
}
}
