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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.database.Cursor;
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import android.util.Log;
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import net.micode.notes.tool.GTaskStringUtils;
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import org.json.JSONException;
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import org.json.JSONObject;
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public class MetaData extends Task {
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// 日志标记，用于在日志输出中识别该类
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private final static String TAG = MetaData.class.getSimpleName();
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// 存储相关的 Gid
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private String mRelatedGid = null;
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// 设置元数据
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public void setMeta(String gid, JSONObject metaInfo) {
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try {
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// 将 Gid 放入元信息的 JSON 对象中
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metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
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} catch (JSONException e) {
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// 记录放入 Gid 失败的错误日志
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Log.e(TAG, "failed to put related gid");
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}
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// 将元信息转换为字符串并设置为笔记
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setNotes(metaInfo.toString());
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// 设置名称为元笔记名称
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setName(GTaskStringUtils.META_NOTE_NAME);
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}
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// 获取相关的 Gid
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public String getRelatedGid() {
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return mRelatedGid;
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}
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@Override
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// 判断是否值得保存
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public boolean isWorthSaving() {
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return getNotes()!= null;
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}
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@Override
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// 根据远程 JSON 数据设置内容
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public void setContentByRemoteJSON(JSONObject js) {
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super.setContentByRemoteJSON(js);
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if (getNotes()!= null) {
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try {
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// 将笔记内容解析为 JSON 对象，并从中获取相关的 Gid
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JSONObject metaInfo = new JSONObject(getNotes().trim());
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mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
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} catch (JSONException e) {
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// 记录获取 Gid 失败的警告日志，并将相关 Gid 设为 null
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Log.w(TAG, "failed to get related gid");
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mRelatedGid = null;
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}
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}
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}
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@Override
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// 不允许调用此方法，会抛出异常
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public void setContentByLocalJSON(JSONObject js) {
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// 此函数不应该被调用
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throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
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}
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@Override
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// 不允许调用此方法，会抛出异常
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public JSONObject getLocalJSONFromContent() {
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throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
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}
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@Override
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// 不允许调用此方法，会抛出异常
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public int getSyncAction(Cursor c) {
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throw new IllegalAccessError("MetaData:getSyncAction should not be called");
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}
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}
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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.data;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.util.Log;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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// 数据库名称
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private static final String DB_NAME = "note.db";
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// 数据库版本号
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private static final int DB_VERSION = 4;
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public interface TABLE {
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// 存储笔记的表名
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public static final String NOTE = "note";
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// 存储数据的表名
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public static final String DATA = "data";
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}
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// 日志标记，用于在日志输出中识别该类
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private static final String TAG = "NotesDatabaseHelper";
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// 单例模式的实例
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private static NotesDatabaseHelper mInstance;
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// 创建笔记表的 SQL 语句
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private static final String CREATE_NOTE_TABLE_SQL =
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"CREATE TABLE " + TABLE.NOTE + "(" +
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NoteColumns.ID + " INTEGER PRIMARY KEY," +
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
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")";
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// 创建数据存储表的 SQL 语句
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private static final String CREATE_DATA_TABLE_SQL =
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"CREATE TABLE " + TABLE.DATA + "(" +
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DataColumns.ID + " INTEGER PRIMARY KEY," +
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DataColumns.MIME_TYPE + " TEXT NOT NULL," +
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA1 + " INTEGER," +
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DataColumns.DATA2 + " INTEGER," +
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
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")";
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// 创建数据表的笔记 ID 索引的 SQL 语句
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private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
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"CREATE INDEX IF NOT EXISTS note_id_index ON " +
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TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
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// 当笔记移动到文件夹时，增加文件夹中笔记计数的触发器
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER increase_folder_count_on_update "+
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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// 当笔记从文件夹中移出时，减少文件夹中笔记计数的触发器
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER decrease_folder_count_on_update " +
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
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" END";
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// 当插入新笔记到文件夹时，增加文件夹中笔记计数的触发器
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
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"CREATE TRIGGER increase_folder_count_on_insert " +
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" AFTER INSERT ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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// 当从文件夹中删除笔记时，减少文件夹中笔记计数的触发器
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER decrease_folder_count_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0;" +
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" END";
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// 当插入数据类型为 {@link DataConstants#NOTE} 时，更新笔记内容的触发器
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
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"CREATE TRIGGER update_note_content_on_insert " +
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" AFTER INSERT ON " + TABLE.DATA +
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" WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";
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// 当数据类型为 {@link DataConstants#NOTE} 的数据更新时，更新笔记内容的触发器
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_update " +
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" AFTER UPDATE ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";
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// 当数据类型为 {@link DataConstants#NOTE} 的数据删除时，更新笔记内容的触发器
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_delete " +
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" AFTER delete ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=''" +
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
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" END";
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// 当笔记被删除时，删除属于该笔记的数据的触发器
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private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
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"CREATE TRIGGER delete_data_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.DATA +
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" WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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// 当文件夹被删除时，删除属于该文件夹的笔记的触发器
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private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
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"CREATE TRIGGER folder_delete_notes_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.NOTE +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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// 当文件夹被移动到回收站时，移动属于该文件夹的笔记到回收站的触发器
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private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
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"CREATE TRIGGER folder_move_notes_on_trash " +
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" AFTER UPDATE ON " + TABLE.NOTE +
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" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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// 构造函数，接收上下文作为参数
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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION);
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}
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// 创建笔记表
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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reCreateNoteTableTriggers(db);
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createSystemFolder(db);
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Log.d(TAG, "note table has been created");
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}
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// 重新创建笔记表的触发器
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
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db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}
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// 创建系统文件夹
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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// 创建通话记录文件夹
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/**
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* call record foler for call notes
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*/
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values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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||||
db.insert(TABLE.NOTE, null, values);
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||||
// 创建根文件夹
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/**
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||||
* root folder which is default folder
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||||
*/
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||||
values.clear();
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||||
values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
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||||
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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||||
db.insert(TABLE.NOTE, null, values);
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||||
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||||
// 创建临时文件夹
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/**
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* temporary folder which is used for moving note
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*/
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||||
values.clear();
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||||
values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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// 创建回收站文件夹
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/**
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* create trash folder
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||||
*/
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||||
values.clear();
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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}
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||||
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// 创建数据存储表
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||||
public void createDataTable(SQLiteDatabase db) {
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db.execSQL(CREATE_DATA_TABLE_SQL);
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reCreateDataTableTriggers(db);
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db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
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||||
Log.d(TAG, "data table has been created");
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||||
}
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||||
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||||
// 重新创建数据存储表的触发器
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||||
private void reCreateDataTableTriggers(SQLiteDatabase db) {
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||||
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
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||||
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
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||||
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
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||||
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||||
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
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||||
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
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||||
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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||||
}
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||||
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||||
// 单例模式的实例获取方法
|
||||
static synchronized NotesDatabaseHelper getInstance(Context context) {
|
||||
if (mInstance == null) {
|
||||
mInstance = new NotesDatabaseHelper(context);
|
||||
}
|
||||
return mInstance;
|
||||
}
|
||||
|
||||
// 数据库创建时调用
|
||||
@Override
|
||||
public void onCreate(SQLiteDatabase db) {
|
||||
createNoteTable(db);
|
||||
createDataTable(db);
|
||||
}
|
||||
|
||||
// 数据库升级时调用
|
||||
@Override
|
||||
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
|
||||
boolean reCreateTriggers = false;
|
||||
boolean skipV2 = false;
|
||||
|
||||
if (oldVersion == 1) {
|
||||
upgradeToV2(db);
|
||||
skipV2 = true; // 此升级包含从 v2 到 v3 的升级
|
||||
oldVersion++;
|
||||
}
|
||||
|
||||
if (oldVersion == 2 &&!skipV2) {
|
||||
upgradeToV3(db);
|
||||
reCreateTriggers = true;
|
||||
oldVersion++;
|
||||
}
|
||||
|
||||
if (oldVersion == 3) {
|
||||
upgradeToV4(db);
|
||||
oldVersion++;
|
||||
}
|
||||
|
||||
if (reCreateTriggers) {
|
||||
reCreateNoteTableTriggers(db);
|
||||
reCreateDataTableTriggers(db);
|
||||
}
|
||||
|
||||
if (oldVersion!= newVersion) {
|
||||
throw new IllegalStateException("Upgrade notes database to version " + newVersion
|
||||
+ "fails");
|
||||
}
|
||||
}
|
||||
|
||||
// 从版本 1 升级到版本 2 的操作
|
||||
private void upgradeToV2(SQLiteDatabase db) {
|
||||
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
|
||||
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
|
||||
createNoteTable(db);
|
||||
createDataTable(db);
|
||||
}
|
||||
|
||||
// 从版本 2 升级到版本 3 的操作
|
||||
private void upgradeToV3(SQLiteDatabase db) {
|
||||
// 删除未使用的触发器
|
||||
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
|
||||
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
|
||||
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
|
||||
// 为笔记表添加 gtask id 列
|
||||
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
|
||||
+ " TEXT NOT NULL DEFAULT ''");
|
||||
// 添加一个回收站系统文件夹
|
||||
ContentValues values = new ContentValues();
|
||||
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
||||
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
||||
db.insert(TABLE.NOTE, null, values);
|
||||
}
|
||||
|
||||
// 从版本 3 升级到版本 4 的操作
|
||||
private void upgradeToV4(SQLiteDatabase db) {
|
||||
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
||||
+ " INTEGER NOT NULL DEFAULT 0");
|
||||
}
|
||||
}
|
||||
Loading…
Reference in new issue