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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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//元数据（Metadata），又称中介数据、中继数据，为描述数据的数据;主要是描述数据属性（property）的信息，用来支持如指示存储位置、历史数据、资源查找、文件记录等功能。元数据算是一种电子式目录，为了达到编制目录的目的，必须在描述并收藏数据的内容或特色，进而达成协助数据检索的目的。
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public class MetaData extends Task {//本类继承于Task,主要用于记录数据的变化。
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private final static String TAG = MetaData.class.getSimpleName();//通过调用getSimpleName ()函数实现
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//得到类的简写名称存入字符串TAG中
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private String mRelatedGid = null;
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//设置数据，即生成元数据库；通过调用JSONObject库函数put ()，Task类中的setNotes ()和setName ()函数实现
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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);//将这对键值放入metaInfo这个jsonobject对象中
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} catch (JSONException e) {
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Log.e(TAG, "failed to put related gid");//输出错误信息
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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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}//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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}//判断当前数据是否为空，若为空则返回真即值得保存
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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) {
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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");//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//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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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");//传递非法参数异常
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}
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@Override//从元数据内容中获取本地json对象，一般不会用到，若用到，则抛出异常
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public JSONObject getLocalJSONFromContent() {
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throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");//传递非法参数异常
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}
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@Override//获取同步动作状态，一般不会用到，若用到，则抛出异常
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public int getSyncAction(Cursor c) {
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throw new IllegalAccessError("MetaData:getSyncAction should not be called");//传递非法参数异常
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}
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}
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