/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * 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.
 */
//本文件实现便签的数据库,实现了对便签的相关属性包括：Anthority, Tag，以及数据，联系人的信息进行保存管理，实现了对若干属性的定义，并定义了DataColumns，DataColumns接口，可用于其余类的实现，在便签管理中实现TextNote,CallNote两个类，用于对便签内容的保存。
package net.micode.notes.data;

import android.net.Uri;
//uri是统一资源标志符（Uniform Resource Identifier），而在这个类中定义了各种Uri常量，以便在其他的类中调用。Uri用处很多，涉及到安卓权限，比如通过Uri可以： 直接拨打电话、调出拨打电话界面、调WEB浏览器、卸载、安装、播放、调用发邮件、直接发邮件等系统功能
public class Notes {
//    Notes类，定义一些基本标识符。该类不对标识符进行任何操作，仅仅只是定义，供其他类调用
    public static final String AUTHORITY = "micode_notes";
//    定义了一个权限名，这里是为了符合Uri的格式而定义的。
    public static final String TAG = "Notes";
//    设置标签，表示APP的名称是Notes
    public static final int TYPE_NOTE     = 0;
//    以下三个常量对NoteColumns.TYPE的值进行设置时会用到
    public static final int TYPE_FOLDER   = 1;
    public static final int TYPE_SYSTEM   = 2;
//    下列ID是系统文件的标识{1.根目录（默认文件夹）2.临时文件夹 3.通话记录}
    /**
     * Following IDs are system folders' identifiers
     * {@link Notes#ID_ROOT_FOLDER } is default folder
     * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
     * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
     */

    public static final int ID_ROOT_FOLDER = 0;
//    根文件夹ID=0
    public static final int ID_TEMPARAY_FOLDER = -1;
//    临时文件夹ID=-1
    public static final int ID_CALL_RECORD_FOLDER = -2;
//    通话记录文件夹id=-2
    public static final int ID_TRASH_FOLER = -3;
//    垃圾文件夹id=-3

    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
//    . 定义ID：通知日期，背景颜色，小部件ID，小部件类型，文件夹ID，来电类型
    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";

    public static final int TYPE_WIDGET_INVALIDE      = -1;
    public static final int TYPE_WIDGET_2X            = 0;
    public static final int TYPE_WIDGET_4X            = 1;

    public static class DataConstants {
//        建立DataContants类：存放textnotes和callnotes地址
        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
//        定义变量NOTE，用来识别text_note的存放地址
        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
//        定义变量CALL_NOTE，用来标志call_note的存放地址
    }

    /**
     * Uri to query all notes and folders
     */
    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
//    定义了Uri常量，便于以后调用系统查询功能（查询所有note和文件夹）
    /**
     * Uri to query data
//     * 查询所有笔记和文件夹的uri
     */
    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
//    调用AUTHORITY的方法，操作data数据
    public interface NoteColumns {
//    定义一个接口类，这里是由若干属性（string）组织成的集合，在之后的NotesDatabaseHelper数据库创建、查询、修改中使用，这里储存的就是关于便签属性的信息，比如创建时间、修改时间、提醒时间等信息。
        /**
         * The unique ID for a row
         * <P> Type: INTEGER (long) </P>
         */
        public static final String ID = "_id";
//    这些常量主要是定义便签的属性的。

        /**
         * The parent's id for note or folder
         * <P> Type: INTEGER (long) </P>
         */
        public static final String PARENT_ID = "parent_id";
//    父节点id的字符串

        /**
         * Created data for note or folder
         * <P> Type: INTEGER (long) </P>
         */
        public static final String CREATED_DATE = "created_date";
//    创建note和文件夹时的数据，如创建时间等

        /**
         * Latest modified date
         * <P> Type: INTEGER (long) </P>
         */
        public static final String MODIFIED_DATE = "modified_date";
//    最近更新的时间等数据


        /**
         * Alert date
         * <P> Type: INTEGER (long) </P>
         */
        public static final String ALERTED_DATE = "alert_date";
//    提醒时间等数据
        /**
         * Folder's name or text content of note
         * <P> Type: TEXT </P>
         */
        public static final String SNIPPET = "snippet";
// 文件夹的名称或便签的内容等数据
        /**
         * Note's widget id
         * <P> Type: INTEGER (long) </P>
         */
        public static final String WIDGET_ID = "widget_id";
//    语句：小部件的ID
        /**
         * Note's widget type
         * <P> Type: INTEGER (long) </P>
         */
        public static final String WIDGET_TYPE = "widget_type";
//    便签背景颜色备注id
        /**
         * Note's background color's id
         * <P> Type: INTEGER (long) </P>
         */
        public static final String BG_COLOR_ID = "bg_color_id";
//    便签背景颜色的ID
        /**
         * For text note, it doesn't has attachment, for multi-media
         * note, it has at least one attachment
         * <P> Type: INTEGER </P>
         */
        public static final String HAS_ATTACHMENT = "has_attachment";
//    标识是否有附件
        /**
         * Folder's count of notes
         * <P> Type: INTEGER (long) </P>
         */
        public static final String NOTES_COUNT = "notes_count";
//    通过对相应标签字符串的定义，方便以后准确的引用
        /**
         * The file type: folder or note
         * <P> Type: INTEGER </P>
         */
        public static final String TYPE = "type";
//    类型：是便签还是文件夹
        /**
         * The last sync id
         * <P> Type: INTEGER (long) </P>
         */
        public static final String SYNC_ID = "sync_id";
//    最后一次同步的ID
        /**
         * Sign to indicate local modified or not
         * <P> Type: INTEGER </P>
         */
        public static final String LOCAL_MODIFIED = "local_modified";
//    表示是否修改本地的信号
        /**
         * Original parent id before moving into temporary folder
         * <P> Type : INTEGER </P>
         */
        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
//    移动到临时文件夹之前的父节点的ID
        /**
         * The gtask id
         * <P> Type : TEXT </P>
         */
        public static final String GTASK_ID = "gtask_id";
//    后台任务的ID
        /**
         * The version code
         * <P> Type : INTEGER (long) </P>
         */
        public static final String VERSION = "version";
    }
//    版本代号
    public interface DataColumns {
//    定义了接口类，在数据库的创建、查询中需要DataColumns的所有信息，主要存储便签数据的信息
        /**
         * The unique ID for a row
         * <P> Type: INTEGER (long) </P>
         */
        public static final String ID = "_id";
//    主要是定义存储便签内容数据的
        /**
         * The MIME type of the item represented by this row.
         * <P> Type: Text </P>
         */
        public static final String MIME_TYPE = "mime_type";
//    这一行表示的项目的MIME类型。MIME是设定某种扩展名的文件用一种应用程序来打开的方式类型，当该扩展名文件被访问的时候，浏览器会自动使用指定应用程序来打开
        /**
         * The reference id to note that this data belongs to
         * <P> Type: INTEGER (long) </P>
         */
        public static final String NOTE_ID = "note_id";
//    标签id
        /**
         * Created data for note or folder
         * <P> Type: INTEGER (long) </P>
         */
        public static final String CREATED_DATE = "created_date";
//    note或folder的创建时间
        /**
         * Latest modified date
         * <P> Type: INTEGER (long) </P>
         */
        public static final String MODIFIED_DATE = "modified_date";
//    标记最后一次修改日期
        /**
         * Data's content
         * <P> Type: TEXT </P>
         */
        public static final String CONTENT = "content";
//    数据包含的内容

        /**
         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
         * integer data type
         * <P> Type: INTEGER </P>
         */
        public static final String DATA1 = "data1";
//    继承于DataColumns的一个类，用来组织文本内容的结构
        /**
         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
         * integer data type
         * <P> Type: INTEGER </P>
         */
        public static final String DATA2 = "data2";

        /**
         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
         * TEXT data type
         * <P> Type: TEXT </P>
         */
        public static final String DATA3 = "data3";

        /**
         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
         * TEXT data type
         * <P> Type: TEXT </P>
         */
        public static final String DATA4 = "data4";

        /**
         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
         * TEXT data type
         * <P> Type: TEXT </P>
         */
        public static final String DATA5 = "data5";
    }

    public static final class TextNote implements DataColumns {
//        文本数据（TextNote）通过关键字implements来实现接口，继承了DataColumns的所有定义常量
        /**
         * Mode to indicate the text in check list mode or not
         * <P> Type: Integer 1:check list mode 0: normal mode </P>
         */
        public static final String MODE = DATA1;

        public static final int MODE_CHECK_LIST = 1;
//        便签模式 列表模式和文字模式
        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
//        修改CONTENT_TYPE属性，即内容类型
        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
//        内容项目类型
        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
    }
//    访问该content_provider的URI，parse方法返回的是一个URI类型。通过这个uri可以访问一个网络上或者本地上的资源
    public static final class CallNote implements DataColumns {
//    通话数据（CallNote）继承了接口类，而后进行了格式适配
        /**
         * Call date for this record
         * <P> Type: INTEGER (long) </P>
         */
        public static final String CALL_DATE = DATA1;
//    在DATA1中存放的是通话时间信息
        /**
         * Phone number for this record
         * <P> Type: TEXT </P>
         */
        public static final String PHONE_NUMBER = DATA3;
//    在DATA3中放的是通话号码信息
        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
//    定义内容类型
        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";

        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
    }
}
