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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.gtask.data;
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import android.appwidget.AppWidgetManager;
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import android.content.ContentResolver;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.net.Uri;
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import android.util.Log;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.gtask.exception.ActionFailureException;
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import net.micode.notes.tool.GTaskStringUtils;
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import net.micode.notes.tool.ResourceParser;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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import java.util.ArrayList;
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public class SqlNote {
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private static final String TAG/*私有静态常量*/ = SqlNote.class.getSimpleName();
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private static final int INVALID_ID = -99999;//无效的 ID
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public static final String[] PROJECTION_NOTE = new String[]
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//需要在查询中选择的笔记属性
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{
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NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
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NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
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NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
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NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
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NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
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NoteColumns.VERSION
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};
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public static final int ID_COLUMN = 0;//ID 属性在 PROJECTION_NOTE 数组中的下标为 0
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public static final int ALERTED_DATE_COLUMN = 1;
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public static final int BG_COLOR_ID_COLUMN = 2;
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public static final int CREATED_DATE_COLUMN = 3;
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public static final int HAS_ATTACHMENT_COLUMN = 4;
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public static final int MODIFIED_DATE_COLUMN = 5;
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public static final int NOTES_COUNT_COLUMN = 6;
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public static final int PARENT_ID_COLUMN = 7;
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public static final int SNIPPET_COLUMN = 8;
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public static final int TYPE_COLUMN = 9;
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public static final int WIDGET_ID_COLUMN = 10;
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public static final int WIDGET_TYPE_COLUMN = 11;
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public static final int SYNC_ID_COLUMN = 12;
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public static final int LOCAL_MODIFIED_COLUMN = 13;
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public static final int ORIGIN_PARENT_ID_COLUMN = 14;
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public static final int GTASK_ID_COLUMN = 15;
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public static final int VERSION_COLUMN = 16;
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private Context mContext;//上下文
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private ContentResolver mContentResolver;//ContentResolver 对象
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private boolean mIsCreate;//表示是否在数据库中创建新笔记
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private long mId;//笔记的 ID
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private long mAlertDate;//提醒日期
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private int mBgColorId;//背景颜色 ID
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private long mCreatedDate;//创建日期
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private int mHasAttachment;//是否有附件
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private long mModifiedDate;//修改日期
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private long mParentId;//父笔记 ID
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private String mSnippet;//笔记的摘要
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private int mType;//笔记类型
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private int mWidgetId;//小部件 ID
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private int mWidgetType;//小部件类型
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private long mOriginParent;//原始父笔记 ID
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private long mVersion;//版本号
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private ContentValues mDiffNoteValues;// ContentValues 类型的 mDiffNoteValues
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private ArrayList<SqlData> mDataList;//SqlData 对象的列表
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public SqlNote(Context context) {
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mContext = context;
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mContentResolver = context.getContentResolver();
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//将传入的上下文对象赋值给成员变量 mContext 和 mContentResolver
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mIsCreate = true;
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//将 mIsCreate 置为 true，表示该笔记是要被创建的
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mId = INVALID_ID;
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//mId 赋值为常量 INVALID_ID，表示该笔记的 ID 是无效的
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mAlertDate = 0;
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mBgColorId = ResourceParser.getDefaultBgId(context);//
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// 将 mBgColorId 设为默认背景颜色 ID；
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mCreatedDate = System.currentTimeMillis();
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// 将 mCreatedDate 和 mModifiedDate 设为当前时间戳。
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mHasAttachment = 0;
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//mHasAttachment 设为 0，表示该笔记没有附件
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mModifiedDate = System.currentTimeMillis();
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mParentId = 0;
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//mParentId 设为 0，表示该笔记的父 ID 是无效的
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mSnippet = "";//mSnippet 设为空字符串，表示该笔记没有摘要
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mType = Notes.TYPE_NOTE;
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mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;//该笔记没有小部件 ID
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mWidgetType = Notes.TYPE_WIDGET_INVALIDE;//该笔记不是小部件
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mOriginParent = 0;//该笔记没有原始父笔记
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mVersion = 0;//笔记的版本号是 0
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mDiffNoteValues = new ContentValues();
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//建一个空的 ContentValues 对象赋值给 mDiffNoteValues
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mDataList = new ArrayList<SqlData>();
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//创建一个空的 SqlData 对象列表 mDataList
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}
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public SqlNote(Context context, Cursor c)
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//将传入的 Cursor 对象中的数据加载到 SqlNote 对象中
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{
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mContext = context;
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mContentResolver = context.getContentResolver();
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//分别赋值为传入的上下文
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mIsCreate = false;//这是一个已经存在的笔记
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loadFromCursor(c);//从 Cursor 对象中读取数据并加载到 SqlNote 对象中
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mDataList = new ArrayList<SqlData>();//创建一个空的 SqlData 对象列表 mDataList
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if (mType == Notes.TYPE_NOTE)
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//如果该笔记是普通笔记，则调用 loadDataContent() 方法从数据库读取笔记内容和附件信息
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loadDataContent();
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mDiffNoteValues = new ContentValues();
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//创建一个空的 ContentValues 对象赋值给 mDiffNoteValues
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}
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public SqlNote(Context context, long id)
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//根据笔记 ID 加载笔记数据
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{
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mContext = context;
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mContentResolver = context.getContentResolver();//初始化
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mIsCreate = false;//已经存在的笔记
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loadFromCursor(id);
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mDataList = new ArrayList<SqlData>();
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if (mType == Notes.TYPE_NOTE)
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loadDataContent();
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mDiffNoteValues = new ContentValues();
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//创建一个空的 ContentValues 对象赋值给 mDiffNoteValues
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}
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private void loadFromCursor(long id)
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//根据给定的笔记 ID 从数据库中加载笔记信息
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{
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Cursor c = null;
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try {
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c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
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//查询指定 ID 的笔记数据
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new String[] {
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String.valueOf(id)
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}, null);//对获取数据进行判空
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if (c != null) {
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c.moveToNext();
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loadFromCursor(c);
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// 不为空，将游标移动到第一行，
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// 并调用 loadFromCursor(Cursor c) 方法将数据加载到 SqlNote 对象中
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} else {
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Log.w(TAG, "loadFromCursor: cursor = null");//为空，则打印一条警告日志
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}
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} finally {
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if (c != null)
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c.close();
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}
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}
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private void loadFromCursor(Cursor c)
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//从 Cursor 对象中加载笔记数据
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{
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mId = c.getLong(ID_COLUMN);//笔记的 ID
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mAlertDate = c.getLong(ALERTED_DATE_COLUMN);//提醒时间
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mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);//背景颜色 ID
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mCreatedDate = c.getLong(CREATED_DATE_COLUMN);//创建时间
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mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);//是否有附件
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mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);//修改时间
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mParentId = c.getLong(PARENT_ID_COLUMN);//父亲笔记的 ID
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mSnippet = c.getString(SNIPPET_COLUMN);//笔记片段
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mType = c.getInt(TYPE_COLUMN);//笔记类型
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mWidgetId = c.getInt(WIDGET_ID_COLUMN);//挂件 ID
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mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);//挂件类型
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mVersion = c.getLong(VERSION_COLUMN);//版本号
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}
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private void loadDataContent()
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//从数据库中读取笔记的内容和附件信息，并将其存储在 mDataList
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{
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Cursor c = null;
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mDataList.clear();
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//清空 mDataList 列表
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try {
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c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
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"(note_id=?)", new String[] {
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String.valueOf(mId)
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}, null);//判断获取到的 Cursor 对象是否为空
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if (c != null) {// 不为空，则判断游标中是否有数据
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if (c.getCount() == 0) {
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Log.w(TAG, "it seems that the note has not data");
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//无数据，则打印一条警告日志并返回
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return;
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}
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while (c.moveToNext()) {
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SqlData data = new SqlData(mContext, c);
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mDataList.add(data);
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}//遍历游标中的每一行数据，创建 SqlData 对象并添加到 mDataList 列表
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} else {
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Log.w(TAG, "loadDataContent: cursor = null");
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}
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} finally {
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if (c != null)
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c.close();
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}
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}
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public boolean setContent(JSONObject js)
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//据传入的 JSONObject 对象设置笔记的内容
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{
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try {
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JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
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if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
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Log.w(TAG, "cannot set system folder");
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} else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
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// for folder we can only update the snnipet and type
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String snippet = note.has(NoteColumns.SNIPPET) ? note
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.getString(NoteColumns.SNIPPET) : "";
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if (mIsCreate || !mSnippet.equals(snippet)) {
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mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
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}
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mSnippet = snippet;
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int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
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: Notes.TYPE_NOTE;
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if (mIsCreate || mType != type) {
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mDiffNoteValues.put(NoteColumns.TYPE, type);
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}
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mType = type;
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} else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
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JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
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long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
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if (mIsCreate || mId != id) {
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mDiffNoteValues.put(NoteColumns.ID, id);
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}
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mId = id;
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long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
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.getLong(NoteColumns.ALERTED_DATE) : 0;
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if (mIsCreate || mAlertDate != alertDate) {
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mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
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}
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mAlertDate = alertDate;
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int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note
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.getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext);
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if (mIsCreate || mBgColorId != bgColorId) {
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mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
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}
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mBgColorId = bgColorId;
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//系统文件夹或者文件夹类型的笔记，只能更新摘要和类型，而对于笔记类型的笔记，会解析出一系列字段，并将它们保存在一个 List 中
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long createDate = note.has(NoteColumns.CREATED_DATE) ? note
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.getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
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if (mIsCreate || mCreatedDate != createDate) {
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mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
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}
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mCreatedDate = createDate;
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int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
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.getInt(NoteColumns.HAS_ATTACHMENT) : 0;
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if (mIsCreate || mHasAttachment != hasAttachment) {
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mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
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}
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mHasAttachment = hasAttachment;
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long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
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.getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
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if (mIsCreate || mModifiedDate != modifiedDate) {
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mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
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}
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mModifiedDate = modifiedDate;
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long parentId = note.has(NoteColumns.PARENT_ID) ? note
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.getLong(NoteColumns.PARENT_ID) : 0;
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if (mIsCreate || mParentId != parentId) {
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mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
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}
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mParentId = parentId;
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String snippet = note.has(NoteColumns.SNIPPET) ? note
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.getString(NoteColumns.SNIPPET) : "";
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if (mIsCreate || !mSnippet.equals(snippet)) {
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mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
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}
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mSnippet = snippet;
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int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
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: Notes.TYPE_NOTE;
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if (mIsCreate || mType != type) {
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mDiffNoteValues.put(NoteColumns.TYPE, type);
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}
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mType = type;
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int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
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: AppWidgetManager.INVALID_APPWIDGET_ID;
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if (mIsCreate || mWidgetId != widgetId) {
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mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
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}
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mWidgetId = widgetId;
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int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note
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.getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE;
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if (mIsCreate || mWidgetType != widgetType) {
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mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
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}
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mWidgetType = widgetType;
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long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note
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.getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
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if (mIsCreate || mOriginParent != originParent) {
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mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
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}
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mOriginParent = originParent;
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//分别解析
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for (int i = 0; i < dataArray.length(); i++)
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{
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JSONObject data = dataArray.getJSONObject(i);
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SqlData sqlData = null;//未找到设置为null
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if (data.has(DataColumns.ID)) //根据数据块 ID 在 mDataList 中查找对应的 SqlData 对象
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{
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long dataId = data.getLong(DataColumns.ID);//赋值
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for (SqlData temp : mDataList) {
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if (dataId == temp.getId()) {
|
|
|
sqlData = temp;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if (sqlData == null) {
|
|
|
sqlData = new SqlData(mContext);
|
|
|
mDataList.add(sqlData);//没找到对像，则新建一个对象并添加到 mDataList 中
|
|
|
}
|
|
|
|
|
|
sqlData.setContent(data);
|
|
|
}
|
|
|
}
|
|
|
} catch (JSONException e) {
|
|
|
Log.e(TAG, e.toString());
|
|
|
e.printStackTrace();
|
|
|
return false;
|
|
|
}//当 JSON 解析出错时，将会抛出 JSONException 异常并被 catch 住
|
|
|
return true;
|
|
|
}
|
|
|
|
|
|
public JSONObject getContent()
|
|
|
//将 SqlData 对象转换为 JSONObject
|
|
|
{
|
|
|
try {
|
|
|
JSONObject js = new JSONObject();
|
|
|
//判断 SqlData 对象是否已经存入数据库中
|
|
|
|
|
|
if (mIsCreate) {
|
|
|
Log.e(TAG, "it seems that we haven't created this in database yet");
|
|
|
return null;
|
|
|
//未存储，返回 null
|
|
|
}
|
|
|
|
|
|
JSONObject note = new JSONObject();
|
|
|
if (mType == Notes.TYPE_NOTE) {
|
|
|
note.put(NoteColumns.ID, mId);
|
|
|
note.put(NoteColumns.ALERTED_DATE, mAlertDate);
|
|
|
note.put(NoteColumns.BG_COLOR_ID, mBgColorId);
|
|
|
note.put(NoteColumns.CREATED_DATE, mCreatedDate);
|
|
|
note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment);
|
|
|
note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);
|
|
|
note.put(NoteColumns.PARENT_ID, mParentId);
|
|
|
note.put(NoteColumns.SNIPPET, mSnippet);
|
|
|
note.put(NoteColumns.TYPE, mType);
|
|
|
note.put(NoteColumns.WIDGET_ID, mWidgetId);
|
|
|
note.put(NoteColumns.WIDGET_TYPE, mWidgetType);
|
|
|
note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);
|
|
|
js.put(GTaskStringUtils.META_HEAD_NOTE, note);
|
|
|
|
|
|
JSONArray dataArray = new JSONArray();
|
|
|
for (SqlData sqlData : mDataList) {
|
|
|
JSONObject data = sqlData.getContent();
|
|
|
if (data != null) {
|
|
|
dataArray.put(data);
|
|
|
}
|
|
|
}//根据 SqlData 对象的类型不同，分别构造 Note 和 Data 两个 JSONObject，
|
|
|
// 并放入 META_HEAD_NOTE 和 META_HEAD_DATA 字段中
|
|
|
js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
|
|
|
} else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
|
|
|
note.put(NoteColumns.ID, mId);
|
|
|
note.put(NoteColumns.TYPE, mType);
|
|
|
note.put(NoteColumns.SNIPPET, mSnippet);
|
|
|
js.put(GTaskStringUtils.META_HEAD_NOTE, note);
|
|
|
}
|
|
|
|
|
|
return js;//将其内容转换为 JSONObject 对象并返回
|
|
|
} catch (JSONException e) {
|
|
|
Log.e(TAG, e.toString());
|
|
|
e.printStackTrace();
|
|
|
}
|
|
|
return null;//遇到错误会打印日志并返回 null
|
|
|
}
|
|
|
|
|
|
public void setParentId(long id)
|
|
|
//设置 SqlData 对象的父节点 ID
|
|
|
{
|
|
|
mParentId = id;
|
|
|
mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
|
|
|
}
|
|
|
|
|
|
public void setGtaskId(String gid) {
|
|
|
mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
|
|
|
}
|
|
|
|
|
|
public void setSyncId(long syncId) {
|
|
|
mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
|
|
|
}
|
|
|
|
|
|
public void resetLocalModified() {
|
|
|
mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
|
|
|
}
|
|
|
|
|
|
public long getId() {
|
|
|
return mId;
|
|
|
}
|
|
|
|
|
|
public long getParentId() {
|
|
|
return mParentId;
|
|
|
}
|
|
|
|
|
|
public String getSnippet() {
|
|
|
return mSnippet;
|
|
|
}
|
|
|
|
|
|
public boolean isNoteType() {
|
|
|
return mType == Notes.TYPE_NOTE;
|
|
|
}
|
|
|
|
|
|
public void commit(boolean validateVersion)
|
|
|
//将 SqlData 对象中的属性变化保存到数据库中
|
|
|
{
|
|
|
if (mIsCreate)
|
|
|
//判断该对象是新创建的还是已经存在于数据库中
|
|
|
{
|
|
|
if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
|
|
|
mDiffNoteValues.remove(NoteColumns.ID);
|
|
|
}
|
|
|
|
|
|
Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
|
|
|
//新建的对象，则调用 insert 方法将其保存到数据库中
|
|
|
try {
|
|
|
mId = Long.valueOf(uri.getPathSegments().get(1));
|
|
|
} catch (NumberFormatException e) {
|
|
|
Log.e(TAG, "Get note id error :" + e.toString());
|
|
|
throw new ActionFailureException("create note failed");
|
|
|
}
|
|
|
if (mId == 0) {
|
|
|
throw new IllegalStateException("Create thread id failed");
|
|
|
}//对是否为新值进行判定
|
|
|
|
|
|
if (mType == Notes.TYPE_NOTE) {
|
|
|
for (SqlData sqlData : mDataList) {
|
|
|
sqlData.commit(mId, false, -1);
|
|
|
//validateVersion 参数指定为 false，mVersion 参数指定为 -1
|
|
|
}
|
|
|
}
|
|
|
} else {
|
|
|
if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
|
|
|
Log.e(TAG, "No such note");
|
|
|
throw new IllegalStateException("Try to update note with invalid id");
|
|
|
}
|
|
|
//判断当前对象的 ID 是否合法，如果不合法则抛出异常
|
|
|
if (mDiffNoteValues.size() > 0) {
|
|
|
mVersion ++;
|
|
|
int result = 0;
|
|
|
if (!validateVersion) {
|
|
|
result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
|
|
|
+ NoteColumns.ID + "=?)", new String[] {
|
|
|
String.valueOf(mId)
|
|
|
});
|
|
|
} else {
|
|
|
result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
|
|
|
+ NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
|
|
|
new String[] {
|
|
|
String.valueOf(mId), String.valueOf(mVersion)
|
|
|
});
|
|
|
}
|
|
|
if (result == 0) {
|
|
|
Log.w(TAG, "there is no update. maybe user updates note when syncing");
|
|
|
}
|
|
|
}//判断笔记是否被成功更新，并在更新失败时输出一些日志信息。
|
|
|
|
|
|
if (mType == Notes.TYPE_NOTE)//检查当前对象是否表示笔记对象
|
|
|
{
|
|
|
for (SqlData sqlData : mDataList) {
|
|
|
sqlData.commit(mId, validateVersion, mVersion);//对比参数，不对校验版本号
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// refresh local info
|
|
|
loadFromCursor(mId);//逐一转换为 SqlData 对象，并添加到 mDataList 变量中
|
|
|
if (mType == Notes.TYPE_NOTE)//加载笔记内容
|
|
|
loadDataContent();
|
|
|
|
|
|
mDiffNoteValues.clear();//清空 mDiffNoteValues 变量
|
|
|
mIsCreate = false;//标记设置为 false，表示当前对象已经存在于数据库中
|
|
|
}
|
|
|
}
|
