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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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* 元数据任务类，继承自基础Task类
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*
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* 功能说明：
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* - 用于处理与Google Task相关的元数据信息
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* - 存储关联任务ID(gid)和元信息JSON数据
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* - 作为特殊类型的任务，不参与常规的同步操作
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*
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* 注意事项：
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* - 此类重写了部分父类方法并直接抛出异常，因为元数据不应通过常规方式操作
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* - 主要用于在笔记和Google Task之间建立关联关系
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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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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 ID
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* @param metaInfo 要存储的元信息JSON对象
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*
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* 说明：
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* - 将gid存入JSON对象中
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* - 设置固定的任务名称标识此为元数据任务
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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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public String getRelatedGid() {
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return mRelatedGid;
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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数据设置内容
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* @param js 包含远程数据的JSON对象
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*
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* 说明：
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* - 解析notes字段中的JSON数据获取关联gid
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* - 如果解析失败会清空已存储的gid
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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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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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/**
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* (禁止使用)从本地JSON设置内容
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* @throws IllegalAccessError 始终抛出，因为元数据不应通过本地JSON设置
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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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* (禁止使用)获取本地JSON内容
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* @throws IllegalAccessError 始终抛出，因为元数据不应转换为本地JSON
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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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* (禁止使用)获取同步动作
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* @throws IllegalAccessError 始终抛出，因为元数据不应参与常规同步
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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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