Android Open Source - netmbuddy D B Helper

From Project

Back to project page netmbuddy.
License

The source code is released under:
------- Default ------- Copyright (C) 2012, 2013, 2014 Younghyung Cho. <yhcting77@gmail.com> All rights reserved. This file is part of NetMBuddy This program is licensed under the FreeBSD license R...
If you think the Android project netmbuddy listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

/******************************************************************************
 * Copyright (C) 2012, 2013, 2014//from ww  w .  j  a va 2  s  .  c o  m
 * Younghyung Cho. <yhcting77@gmail.com>
 * All rights reserved.
 *
 * This file is part of NetMBuddy
 *
 * This program is licensed under the FreeBSD license
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation
 * are those of the authors and should not be interpreted as representing
 * official policies, either expressed or implied, of the FreeBSD Project.
 *****************************************************************************/

package free.yhc.netmbuddy.db;

import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.os.Process;
import free.yhc.netmbuddy.model.YTVideoFeed;
import free.yhc.netmbuddy.utils.Utils;

public class DBHelper {
    private static final boolean DBG = false;
    private static final Utils.Logger P = new Utils.Logger(DBHelper.class);

    private static final int MSG_WHAT_CLOSE         = 0;
    private static final int MSG_WHAT_CHECK_EXIST   = 1;

    private BGHandler               mBgHandler  = null;
    private CheckDupDoneReceiver    mDupRcvr    = null;

    public interface CheckDupDoneReceiver {
        void checkDupDone(DBHelper helper, CheckDupArg arg,
                          boolean[] results, Err err);
    }

    public static enum Err {
        NO_ERR
    }

    public static class CheckDupArg {
        public final Object                 tag;
        public final YTVideoFeed.Entry[]    ents;
        public CheckDupArg(Object aTag, YTVideoFeed.Entry[] aEnts) {
            tag = aTag;
            ents = aEnts;
        }
    }

    private static class BGThread extends HandlerThread {
        BGThread() {
            super("DBHelper.BGThread",Process.THREAD_PRIORITY_BACKGROUND);
        }

        @Override
        protected void
        onLooperPrepared() {
            super.onLooperPrepared();
        }
    }

    private static class BGHandler extends Handler {
        private final DBHelper  _mHelper;

        private boolean         _mClosed  = false;

        BGHandler(Looper    looper,
                  DBHelper  helper) {
            super(looper);
            _mHelper = helper;
        }

        private boolean[]
        checkDup(YTVideoFeed.Entry[] entries) {
            // TODO
            // Should I check "entries[i].available" flag???
            boolean[] r = new boolean[entries.length];
            for (int i = 0; i < r.length; i++)
                r[i] = DB.get().containsVideo(entries[i].media.videoId);
            return r;
        }

        private void
        sendCheckDupDone(final CheckDupArg arg, final boolean[] results, final Err err) {
            Utils.getUiHandler().post(new Runnable() {
                @Override
                public void
                run() {
                    CheckDupDoneReceiver rcvr = _mHelper.getCheckDupDoneReceiver();
                    if (!_mClosed && null != rcvr)
                        rcvr.checkDupDone(_mHelper, arg, results, err);
                }
            });
            return;
        }

        private void
        handleCheckDup(CheckDupArg arg) {
            sendCheckDupDone(arg, checkDup(arg.ents), Err.NO_ERR);
        }

        void
        close() {
            removeMessages(MSG_WHAT_CHECK_EXIST);
            sendEmptyMessage(MSG_WHAT_CLOSE);
        }

        @Override
        public void
        handleMessage(Message msg) {
            if (_mClosed)
                return;

            switch (msg.what) {
            case MSG_WHAT_CLOSE:
                _mClosed = true;
                ((HandlerThread)getLooper().getThread()).quit();
                break;

            case MSG_WHAT_CHECK_EXIST:
                handleCheckDup((CheckDupArg)msg.obj);
                break;
            }
        }
    }

    CheckDupDoneReceiver
    getCheckDupDoneReceiver() {
        return mDupRcvr;
    }

    // ======================================================================
    //
    //
    //
    // ======================================================================
    public void
    setCheckDupDoneReceiver(CheckDupDoneReceiver rcvr) {
        mDupRcvr = rcvr;
    }

    public void
    checkDupAsync(CheckDupArg arg) {
        Message msg = mBgHandler.obtainMessage(MSG_WHAT_CHECK_EXIST, arg);
        mBgHandler.sendMessage(msg);
    }

    public DBHelper() {
    }

    public void
    open() {
        HandlerThread hThread = new BGThread();
        hThread.start();
        mBgHandler = new BGHandler(hThread.getLooper(), this);
    }

    public void
    close() {
        // TODO
        // Stop running thread!
        // Need to check that below code works as expected perfectly.
        // "interrupting thread" is quite annoying and unpredictable job!
        if (null != mBgHandler) {
            mBgHandler.close();
            mBgHandler = null;
        }
    }
}
Java Source Code List
