DataPersistLayer.java

/**
 * The MIT License (MIT)
 * Copyright (c) 2012-2014 唐虞科技(TangyuSoft) Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.tangyu.component.demo.service.remind;

import android.content.Context;
import android.content.SharedPreferences;

import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;

/**
 * The best way is save data to DB. And pass {@link android.content.ContentProvider} to communicate with it.<br>
 * It's avoiding some big question which is happen multiple threads or process read same db file.<br>
 * I will change to use {@link android.content.ContentProvider} it in follow update.
 * @author binliu on 1/8/14.
 */
public class DataPersistLayer {

    public final String KEY_PREFS_BASELINE = "baseline";

    public List<RemindData> generalTestData() {

        final long currentTimeMills = System.currentTimeMillis();
        final long baseline = prefs.getLong(KEY_PREFS_BASELINE, currentTimeMills);
        List<RemindData> result = new LinkedList<RemindData>();
        Calendar baselineCalendar = Calendar.getInstance();
        for (int i = 0; i <= 10; i++) {
            baselineCalendar.setTimeInMillis(baseline);
            RemindData data = new RemindData();
            baselineCalendar.add(Calendar.MINUTE, i - 5);
            data.setmRemindTime(baselineCalendar.getTimeInMillis());
            data.setmRemindId(i);
            result.add(data);
        }
        if (currentTimeMills == baseline) {
            SharedPreferences.Editor editor = prefs.edit();
            if (null != editor) {
                editor.putLong(KEY_PREFS_BASELINE, baseline);
                editor.commit();
            }
        }
        return result;
    }

    SharedPreferences prefs;
    public DataPersistLayer(Context context) {
        prefs = context.getSharedPreferences("status-saver", Context.MODE_PRIVATE);
    }

    /**
     * the best way is save data to DB. And pass {@link android.content.ContentProvider} to communicate with it.<br>
     *
     * it's avoiding some big question which is happen multiple threads or process read same db file.
     * @param remindDatas
     */
    public void saveStatus(List<RemindData> remindDatas){
        SharedPreferences.Editor editor = prefs.edit();
        if (editor != null) {
            for (RemindData rd : remindDatas) {
                editor.putInt("" + rd.getmRemindId(), rd.getmRemindState());
            }
        }
        editor.commit();
    }

    /**
     * the best way is save data to DB. And pass {@link android.content.ContentProvider} to communicate with it.<br>
     *
     * it's avoiding some big question which is happen multiple threads or process read same db file.
     * @param remindDatas
     */
    public void restoreStatus(List<RemindData> remindDatas) {
        for (RemindData data : remindDatas) {
            int status = prefs.getInt(data.getmRemindId() + "", RemindData.REMIND_STATE_INVALID);
            if (status != RemindData.REMIND_STATE_INVALID) {
                data.setmRemindState(status);
            }
        }
    }

    public void reset() {
        SharedPreferences.Editor editor = prefs.edit();
        if (null != editor) {
            editor.remove(KEY_PREFS_BASELINE);
            editor.commit();
        }
    }

    public boolean isInitState() {
        return prefs.getLong(KEY_PREFS_BASELINE, -1) == -1;
    }
}