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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;//包名，继承于Task，主要用于记录数据的变化。
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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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public class MetaData extends Task {//创建一个继承 Task 的类MataData
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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，设置数据，即生成元数据库
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try {
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metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
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} catch (JSONException e) {//捕捉异常
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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);//设置gtask的名字
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}
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public String getRelatedGid() {
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return mRelatedGid;
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}//获取相关联的Gid
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@Override
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public boolean isWorthSaving() {
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return getNotes() != null;
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}//判断是否值得存放，即当前数据是否有效，若数据非空则返回真值
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@Override
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public void setContentByRemoteJSON(JSONObject js) {//使用远程json数据对象设置元数据内容
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super.setContentByRemoteJSON(js);
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if (getNotes() != null) {//如果数据非空，获取jsono metainfo和相关gid
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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) {//catch中的代码是进行异常处理的
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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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@Override
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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");
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}
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@Override
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public JSONObject getLocalJSONFromContent() {//从元数据内容中获取本地json对象，抛出异常
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throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
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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");//非法参数异常
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}
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}
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