Java tutorial
/* * Copyright (C) 2013 Chris Lacy * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package org.tweetalib.android; import android.util.Log; import org.appdotnet4j.model.AdnUser; import org.asynctasktex.AsyncTaskEx; import org.socialnetlib.android.AppdotnetApi; import org.tweetalib.android.model.TwitterUser; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import twitter4j.Twitter; import twitter4j.TwitterException; import twitter4j.User; public class TwitterFetchUser { private FetchUserWorkerCallbacks mCallbacks; private final HashMap<Long, TwitterUser> mUserIdHashMap; private final HashMap<String, TwitterUser> mUserScreenNameHashMap; private Integer mFetchUserCallbackHandle; private final HashMap<Integer, FinishedCallback> mFinishedCallbackMap; /* * */ public void clearCallbacks() { if (mFinishedCallbackMap != null) { mFinishedCallbackMap.clear(); } } /* * */ public interface FetchUserWorkerCallbacks { public AppdotnetApi getAppdotnetApi(); public Twitter getTwitterInstance(); } /* * */ public interface FinishedCallbackInterface { public void finished(TwitterFetchResult result, TwitterUser user); } /* * */ public abstract class FinishedCallback implements FinishedCallbackInterface { static final int kInvalidHandle = -1; public FinishedCallback() { mHandle = kInvalidHandle; } private int mHandle; } /* * */ public TwitterFetchUser() { mFinishedCallbackMap = new HashMap<Integer, FinishedCallback>(); mFetchUserCallbackHandle = 0; mUserIdHashMap = new HashMap<Long, TwitterUser>(); mUserScreenNameHashMap = new HashMap<String, TwitterUser>(); } /* * */ public void setWorkerCallbacks(FetchUserWorkerCallbacks callbacks) { mCallbacks = callbacks; } /* * */ FinishedCallback getFetchStatusesCallback(Integer callbackHandle) { return mFinishedCallbackMap.get(callbackHandle); } /* * */ void removeFetchStatusesCallback(FinishedCallback callback) { if (mFinishedCallbackMap.containsValue(callback)) { mFinishedCallbackMap.remove(callback.mHandle); } } /* * */ Twitter getTwitterInstance() { return mCallbacks.getTwitterInstance(); } AppdotnetApi getAppdotnetApi() { return mCallbacks.getAppdotnetApi(); } /* * */ public void setUser(TwitterUser twitterUser) { if (twitterUser == null) { return; } if (!mUserIdHashMap.containsKey(twitterUser.getId())) { mUserIdHashMap.put(twitterUser.getId(), twitterUser); } if (!mUserScreenNameHashMap.containsKey(twitterUser.getScreenName())) { mUserScreenNameHashMap.put(twitterUser.getScreenName(), twitterUser); } } public void setUser(User user, boolean forceUpdate) { Long userId = Long.valueOf(user.getId()); TwitterUser twitterUser = new TwitterUser(user); if (forceUpdate || !mUserIdHashMap.containsKey(userId)) { mUserIdHashMap.put(userId, twitterUser); } if (forceUpdate || !mUserIdHashMap.containsKey(twitterUser.getScreenName())) { mUserScreenNameHashMap.put(twitterUser.getScreenName(), twitterUser); } } public void setUser(AdnUser user, boolean forceUpdate) { Long userId = Long.valueOf(user.mId); TwitterUser twitterUser = new TwitterUser(user); if (forceUpdate || !mUserIdHashMap.containsKey(userId)) { mUserIdHashMap.put(userId, twitterUser); } if (forceUpdate || !mUserIdHashMap.containsKey(twitterUser.getScreenName())) { mUserScreenNameHashMap.put(twitterUser.getScreenName(), twitterUser); } } /* * */ public TwitterUser getUser(Long userId, FinishedCallback callback, ConnectionStatus connectionStatus) { TwitterUser user = mUserIdHashMap.get(userId); if (callback != null) { trigger(userId, callback, connectionStatus); } return user; } public TwitterUser getUser(String screenName, FinishedCallback callback, ConnectionStatus connectionStatus) { TwitterUser user = mUserScreenNameHashMap.get(screenName); if (callback != null) { trigger(screenName, callback, connectionStatus); } return user; } public List<TwitterUser> getCachedUsers() { return new ArrayList<TwitterUser>(mUserIdHashMap.values()); } public TwitterUser getCachedUser(Long userId) { if (!mUserIdHashMap.containsKey(userId)) { return null; } return mUserIdHashMap.get(userId); } /* * */ public void verifyUser(FinishedCallback callback, ConnectionStatus connectionStatus) { if (connectionStatus != null && !connectionStatus.isOnline()) { if (callback != null) { callback.finished(new TwitterFetchResult(false, connectionStatus.getErrorMessageNoConnection()), null); } return; } mFinishedCallbackMap.put(mFetchUserCallbackHandle, callback); new FetchUserTask().execute(AsyncTaskEx.PRIORITY_HIGH, "Validate User", new FetchUserTaskInput(mFetchUserCallbackHandle, connectionStatus)); mFetchUserCallbackHandle += 1; } /* * */ private void trigger(Long userId, FinishedCallback callback, ConnectionStatus connectionStatus) { if (connectionStatus != null && !connectionStatus.isOnline()) { if (callback != null) { callback.finished(new TwitterFetchResult(false, connectionStatus.getErrorMessageNoConnection()), null); } return; } assert (!mFinishedCallbackMap.containsValue(callback)); mFinishedCallbackMap.put(mFetchUserCallbackHandle, callback); new FetchUserTask().execute(AsyncTaskEx.PRIORITY_HIGH, "Fetch User", new FetchUserTaskInput(userId, mFetchUserCallbackHandle, connectionStatus)); mFetchUserCallbackHandle += 1; } private void trigger(String screenName, FinishedCallback callback, ConnectionStatus connectionStatus) { if (connectionStatus != null && !connectionStatus.isOnline()) { if (callback != null) { callback.finished(new TwitterFetchResult(false, connectionStatus.getErrorMessageNoConnection()), null); } return; } assert (!mFinishedCallbackMap.containsValue(callback)); mFinishedCallbackMap.put(mFetchUserCallbackHandle, callback); new FetchUserTask().execute(AsyncTaskEx.PRIORITY_HIGH, "Fetch User", new FetchUserTaskInput(screenName, mFetchUserCallbackHandle, connectionStatus)); mFetchUserCallbackHandle += 1; } /* * */ public void cancel(FinishedCallback callback) { removeFetchStatusesCallback(callback); } /* * */ class FetchUserTaskInput { FetchUserTaskInput(Long userId, Integer callbackHandle, ConnectionStatus connectionStatus) { mCallbackHandle = callbackHandle; mUserId = userId; mConnectionStatus = connectionStatus; } FetchUserTaskInput(String screenName, Integer callbackHandle, ConnectionStatus connectionStatus) { mCallbackHandle = callbackHandle; mScreenName = screenName; mConnectionStatus = connectionStatus; } FetchUserTaskInput(Integer callbackHandle, ConnectionStatus connectionStatus) { mCallbackHandle = callbackHandle; mVerifyCredentials = true; mConnectionStatus = connectionStatus; } final Integer mCallbackHandle; Boolean mVerifyCredentials; Long mUserId; String mScreenName; final ConnectionStatus mConnectionStatus; } /* * */ class FetchUserTaskOutput { FetchUserTaskOutput(TwitterFetchResult fetchResult, Integer callbackHandle, TwitterUser user) { mFetchResult = fetchResult; mCallbackHandle = callbackHandle; mUser = user; } final TwitterFetchResult mFetchResult; final Integer mCallbackHandle; final TwitterUser mUser; } /* * */ class FetchUserTask extends AsyncTaskEx<FetchUserTaskInput, Void, FetchUserTaskOutput> { @Override protected FetchUserTaskOutput doInBackground(FetchUserTaskInput... inputArray) { TwitterUser result = null; FetchUserTaskInput input = inputArray[0]; if (input.mConnectionStatus != null && !input.mConnectionStatus.isOnline()) { return new FetchUserTaskOutput( new TwitterFetchResult(false, input.mConnectionStatus.getErrorMessageNoConnection()), input.mCallbackHandle, null); } String errorDescription = null; Twitter twitter = getTwitterInstance(); if (twitter != null) { try { User user = null; if (input.mVerifyCredentials != null && input.mVerifyCredentials.booleanValue()) { Log.d("api-call", "verifyCredentials"); user = twitter.verifyCredentials(); } else { Log.d("api-call", "showUser"); if (input.mUserId != null) { user = twitter.showUser(input.mUserId); } else if (input.mScreenName != null) { user = twitter.showUser(input.mScreenName); } } result = new TwitterUser(user); setUser(result); } catch (TwitterException e) { e.printStackTrace(); errorDescription = e.getErrorMessage(); Log.e("api-call", errorDescription, e); if (e.getRateLimitStatus() != null && e.getRateLimitStatus().getRemaining() <= 0) { errorDescription += "\nTry again in " + e.getRateLimitStatus().getSecondsUntilReset() + " " + "seconds"; } } } else { AppdotnetApi api = getAppdotnetApi(); if (api != null && input.mUserId != null) { result = api.getAdnUser(input.mUserId); setUser(result); } } return new FetchUserTaskOutput(new TwitterFetchResult(errorDescription == null, errorDescription), input.mCallbackHandle, result); } @Override protected void onPostExecute(FetchUserTaskOutput output) { FinishedCallback callback = getFetchStatusesCallback(output.mCallbackHandle); if (callback != null) { callback.finished(output.mFetchResult, output.mUser); removeFetchStatusesCallback(callback); } super.onPostExecute(output); } } }