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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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* 元数据管理类，用于处理与Google Task同步相关的元数据信息
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* 继承自Task类，主要管理关联任务ID和元数据的存储与解析
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*/
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public class MetaData extends Task {
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// 日志标签
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private final static String TAG = MetaData.class.getSimpleName();
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// 关联的Google Task服务器ID
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private String mRelatedGid = null;
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/**
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* 设置元数据信息
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* @param gid 关联的Google Task服务器ID
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* @param metaInfo 需要存储的元数据JSON对象
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* 将gid存入metaInfo后，序列化为字符串存储到notes字段
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* 并设置固定名称标识为元数据笔记
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*/
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public void setMeta(String gid, JSONObject metaInfo) {
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try {
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// 将关联的GTask ID注入元数据头部
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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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// 序列化元数据到笔记内容字段
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setNotes(metaInfo.toString());
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// 设置固定名称标识为元数据笔记
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setName(GTaskStringUtils.META_NOTE_NAME);
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}
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/**
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* 获取关联的GTask ID
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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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/**
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* 判断是否需要保存（当notes字段有内容时需保存）
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*/
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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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* 通过远程JSON数据设置内容
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* 解析notes字段中的元数据并提取关联的GTask ID
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*/
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@Override
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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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// 反序列化notes字段内容
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JSONObject metaInfo = new JSONObject(getNotes().trim());
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// 提取关联的GTask ID
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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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// 以下方法在元数据管理中不应被调用，直接抛出异常
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/**
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* 元数据不应通过本地JSON设置内容
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* @throws IllegalAccessError 始终抛出，标识非法调用
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*/
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@Override
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public void setContentByLocalJSON(JSONObject js) {
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throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
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}
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/**
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* 元数据不需要生成本地JSON内容
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* @throws IllegalAccessError 始终抛出，标识非法调用
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*/
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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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/**
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* 元数据不处理本地数据库同步操作
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* @throws IllegalAccessError 始终抛出，标识非法调用
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*/
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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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} |
