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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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/**
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* gtask同步任务的元数据管理类
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* 存储和管理笔记与gtask同步时的元数据信息
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* MetaData是什么?描述便签属性的信息，比如创建时间、修改时间、便签ID等，而不是便签的正文内容。
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* gid是什么?google为每个同步任务分配的唯一标识，分给远端，保证同步的一致性
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* JSON是什么?一种数据封装格式，用于封装MetaData，可读性强，可被用户或其他应用读取/编辑
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*
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* 继承Task类，专门用于存储同步元数据
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*/
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public class MetaData extends Task {
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/**
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* MetaData.class拿到MetaData的class对象
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* getSimpleName返回类名不含包名的简短形式，这里就是’MetaData‘
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*/
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private final static String TAG = MetaData.class.getSimpleName();
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//存储当前元数据关联的gid
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private String mRelatedGid = null;
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/**
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*设置元数据的核心方法
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* 将关联的gtask ID封装到JSON对象中，并设置为Task的笔记内容和名称
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* @param gid 相当于远端的身份证号
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* @param metaInfo JSONObject对象，用来存储MetaData的JSON格式数据结构。
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*/
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public void setMeta(String gid, JSONObject metaInfo) {
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try {
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metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
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} catch (JSONException e) {
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Log.e(TAG, "failed to put related gid");
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}
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setNotes(metaInfo.toString());
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setName(GTaskStringUtils.META_NOTE_NAME);
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}
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/**
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* 获取当前元数据关联的gtask ID
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* @return 关联的远端gtask ID(返回null时，未关联）
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*/
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public String getRelatedGid() {
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return mRelatedGid;
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}
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//笔记内容不为空就保存
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@Override
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public boolean isWorthSaving() {
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return getNotes() != null;
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}
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/**
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* 从远端gtask返回的JSON数据设置当前元数据内容
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* @param js 远端gtask返回的JSON对象
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*/
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@Override
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public void setContentByRemoteJSON(JSONObject js) {
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//调用父类方法，初始化task基础属性
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super.setContentByRemoteJSON(js);
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if (getNotes() != null) {
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try {
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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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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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/**不会将元数据单独保存为JSON文件并保存到本地，
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* 而是将MetaData和正文一起存储在本地的SQLite数据库，
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* 为了防止用户篡改信息，比如便签的创建时间，导致APP读取数据时出现异常
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*/
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@Override
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public void setContentByLocalJSON(JSONObject js) {
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// this function should not be called
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throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
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}
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//不支持生成本地JSON
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@Override
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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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//无需计算同步动作
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@Override
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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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