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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;//声名一个包，包名包含多个层次，每个层次用'.'分割,这是data包，用倒置的域名开头
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import android.database.Cursor;//引用android.database.Cursor类，基于数据库服务的类
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import android.util.Log;//日志工具类，常用的方法有：Log.v() Log.d() Log.i() Log.w() Log.e()
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import net.micode.notes.tool.GTaskStringUtils;//引用tool包中的GTaskStringUtils工具类。
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import org.json.JSONException;//引用JSON使用失败异常处理类
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import org.json.JSONObject;//引用JSON对象库类，JsonObject是一种数据格式。其格式为{"key1":value1,"key2",value2....};key必须是字符串。
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public class MetaData extends Task {//创建一个继承于Task的类MetaData,主要用于记录数据的变化
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private final static String TAG = MetaData.class.getSimpleName();//调用getSimpleName()函数,得到类的简写名称存入字符串TAG中
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private String mRelatedGid = null;//创建私有变量mRelatedGid，并初始化为null。
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public void setMeta(String gid, JSONObject metaInfo) {//调用JSONObject库函数put ()，Task类中的setNotes ()和setName ()函数，实现设置数据，即生成元数据库
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try {//执行
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metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);//将这对键值放入metaInfo这个jsonobject对象中
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} catch (JSONException e) {//捕捉异常并进行异常处理放入TAG
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Log.e(TAG, "failed to put related gid");//输出错误信息，TAG为类名，即该类无法放入相关联gid信息
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}
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setNotes(metaInfo.toString());//设置便签，将json类的metaInfo转为string
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setName(GTaskStringUtils.META_NOTE_NAME);//设置GTask的名字
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}
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public String getRelatedGid() {
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return mRelatedGid;//获取相关联的Gid
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}
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@Override// @Override 注解是用来指定方法重写的
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public boolean isWorthSaving() {
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return getNotes() != null;
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}//如果getNotes不等于null就返回真，如果便签内容非空，getNotes就不为null
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@Override//表示重写
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public void setContentByRemoteJSON(JSONObject js) {//调用父类Task中的setContentByRemoteJSON ()函数，使用远程json数据对象设置元数据内容
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super.setContentByRemoteJSON(js);//调用函数
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if (getNotes() != null) {//如果数据非空
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try {//执行
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JSONObject metaInfo = new JSONObject(getNotes().trim());//创建新json对象，调用trim方法去掉首尾空格
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mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);//获取关联gid，且为字符串类型
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} catch (JSONException e) {//进行异常处理
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Log.w(TAG, "failed to get related gid");//输出警告信息
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mRelatedGid = null;
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}
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}
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}
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@Override//表示重写
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public void setContentByLocalJSON(JSONObject js) {//使用本地json数据对象设置元数据内容，一般不会用到，若用到，则抛出异常
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// this function should not be called
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throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");//抛出非法参数异常
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}
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@Override//表示重写
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public JSONObject getLocalJSONFromContent() {//从元数据内容中获取本地json对象
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throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");//抛出非法参数异常
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}
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@Override//表示重写
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public int getSyncAction(Cursor c) {//获取同步动作状态
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throw new IllegalAccessError("MetaData:getSyncAction should not be called");//抛出非法参数异常
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}
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}
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