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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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* 元数据实体类，继承自Task，用于存储与Google Tasks相关的元数据信息
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* 主要处理元数据的JSON解析、关联GID管理等逻辑
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*/
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public class MetaData extends Task {
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private final static String TAG = MetaData.class.getSimpleName();
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// 关联的Google Tasks的GID（全局唯一标识符）
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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 Tasks的GID
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* @param metaInfo 包含元数据的JSON对象
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*/
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public void setMeta(String gid, JSONObject metaInfo) {
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try {
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// 在元数据JSON中添加GID头部信息
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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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// 将元数据JSON转为字符串存储到便签内容中
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setNotes(metaInfo.toString());
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// 设置元数据对应的便签名称（固定为预定义常量）
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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Google Tasks的GID
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* @return 关联的GID，若无则返回null
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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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* 判断元数据是否值得保存（当前逻辑：只要便签内容不为空则值得保存）
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* @return 便签内容不为null时返回true，否则false
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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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* 从远程JSON数据中解析并设置元数据内容（供同步模块调用）
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* @param js 包含远程数据的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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super.setContentByRemoteJSON(js); // 先调用父类解析逻辑
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if (getNotes() != null) {
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try {
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// 解析便签内容中的元数据JSON
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JSONObject metaInfo = new JSONObject(getNotes().trim());
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// 提取关联的GID
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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; // 解析失败时清空GID
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}
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}
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}
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/**
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* 本地JSON内容设置方法（禁止调用）
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* @throws IllegalAccessError 始终抛出异常，表明该方法不允许使用
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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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/**
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* 获取本地JSON内容方法（禁止调用）
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* @throws IllegalAccessError 始终抛出异常，表明该方法不允许使用
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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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* 获取同步操作类型（禁止调用）
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* @param c 数据库游标（未使用）
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* @throws IllegalAccessError 始终抛出异常，表明该方法不允许使用
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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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}
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