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**********************MetaData***********
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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; //包
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//导入所需的类
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import android.database.Cursor; //处理数据库查询的Cursor类
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import android.util.Log; //日志记录类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 //声明MetaData类,这个类extends了Task类,即继承了Task类的所有属性和方法
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{
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private final static String TAG = MetaData.class.getSimpleName();
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//定义了一个私有静态常量字符串 TAG,用于标识日志记录的来源。TAG 的值是 MetaData 类的简单名称
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private String mRelatedGid = null;
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//声明了一个私有字符串变量 mRelatedGid,用于存储关联的 GID(Google 任务 ID)
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public void setMeta(String gid, JSONObject metaInfo) {
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//定义了一个公共方法 setMeta,接受两个参数:一个字符串 gid 和一个 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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//通过调用 JSONObject 的 put 方法,将 GID 存储到传入的 metaInfo 中。如果出现 JSON 解析异常,则记录错误日志,failed to put related gid
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setNotes(metaInfo.toString());
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setName(GTaskStringUtils.META_NOTE_NAME);
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}
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//然后,将转换后的 metaInfo 对象转换为字符串,并将其设置为任务的注释(notes),同时设置任务的名称为预定义的 META_NOTE_NAME。
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public String getRelatedGid() {
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return mRelatedGid; //定义公共方法 getRelatedGid,用于获取关联的 GID
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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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//重写了父类的方法 isWorthSaving,用于判断任务是否值得保存。如果任务的注释不为 null,则返回 true
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@Override
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public void setContentByRemoteJSON(JSONObject js) {
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//重写了父类的方法 setContentByRemoteJSON,用于从远程 JSON 数据设置任务的内容
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super.setContentByRemoteJSON(js); //首先调用父类的方法来设置任务的内容
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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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} //然后,从任务的注释中提取关联的 GID,如果提取失败则记录警告日志"failed to get related gid"
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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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//重写了父类的方法 setContentByLocalJSON,但是抛出了一个非法访问错误,表示这个方法不应该被调用
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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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//重写了父类的方法 getLocalJSONFromContent,也抛出了一个非法访问错误。
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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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//重写了父类的方法 getSyncAction,同样抛出了一个非法访问错误。
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}
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