org.mariotaku.twidere.loader.Twitter4JActivitiesLoader.java Source code

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Here is the source code for org.mariotaku.twidere.loader.Twitter4JActivitiesLoader.java

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/*
 *            Twidere - Twitter client for Android
 * 
 * Copyright (C) 2012 Mariotaku Lee <mariotaku.lee@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.mariotaku.twidere.loader;

import static org.mariotaku.twidere.util.Utils.getTwitterInstance;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.mariotaku.twidere.Constants;
import org.mariotaku.twidere.util.SerializationUtil;

import twitter4j.Activity;
import twitter4j.Paging;
import twitter4j.ResponseList;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.content.AsyncTaskLoader;

public abstract class Twitter4JActivitiesLoader extends AsyncTaskLoader<List<Activity>> implements Constants {

    private final Twitter mTwitter;
    private final long mAccountId;
    private final List<Activity> mData;
    private final boolean mIsFirstLoad, mIsHomeTab;
    private final String mClassName;

    public Twitter4JActivitiesLoader(final Context context, final long account_id, final List<Activity> data,
            final String class_name, final boolean is_home_tab) {
        super(context);
        mTwitter = getTwitterInstance(context, account_id, true);
        mAccountId = account_id;
        mIsFirstLoad = data == null;
        mIsHomeTab = is_home_tab;
        mClassName = class_name;
        mData = data != null ? data : new ArrayList<Activity>();
    }

    public long getAccountId() {
        return mAccountId;
    }

    public List<Activity> getData() {
        return mData;
    }

    public Twitter getTwitter() {
        return mTwitter;
    }

    @Override
    public List<Activity> loadInBackground() {
        if (mIsFirstLoad && mIsHomeTab && mClassName != null) {
            try {
                final File f = new File(getContext().getCacheDir(), mClassName + "." + getAccountId());
                @SuppressWarnings("unchecked")
                final List<Activity> cached_activities = (List<Activity>) SerializationUtil.read(f.getPath());
                return cached_activities;
            } catch (final IOException e) {
            } catch (final ClassNotFoundException e) {
            } catch (final ClassCastException e) {
            }
        }
        ResponseList<Activity> activities = null;
        try {
            final Paging paging = new Paging();
            final SharedPreferences prefs = getContext().getSharedPreferences(SHARED_PREFERENCES_NAME,
                    Context.MODE_PRIVATE);
            final int load_item_limit = prefs.getInt(PREFERENCE_KEY_LOAD_ITEM_LIMIT,
                    PREFERENCE_DEFAULT_LOAD_ITEM_LIMIT);
            paging.setCount(load_item_limit > 100 ? 100 : load_item_limit);
            activities = getActivities(paging);
        } catch (final TwitterException e) {
            e.printStackTrace();
        }
        if (activities != null) {
            Collections.sort(activities);
        }
        return activities;
    }

    @Override
    protected void onStartLoading() {
        forceLoad();
    }

    abstract ResponseList<Activity> getActivities(Paging paging) throws TwitterException;

    public static void writeSerializableStatuses(final Object instance, final Context context,
            final List<Activity> data, final Bundle args) {
        if (instance == null || context == null || data == null || args == null)
            return;
        final long account_id = args.getLong(INTENT_KEY_ACCOUNT_ID, -1);
        try {
            final FileOutputStream fos = new FileOutputStream(
                    new File(context.getCacheDir(), instance.getClass().getSimpleName() + "." + account_id));
            final ObjectOutputStream os = new ObjectOutputStream(fos);
            os.writeObject(data);
            os.close();
            fos.close();
        } catch (final IOException e) {
        }
    }

}