/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.micode.notes.gtask.data;//包名，继承于Task，主要用于记录数据的变化。

import android.database.Cursor;
import android.util.Log;

import net.micode.notes.tool.GTaskStringUtils;

import org.json.JSONException;
import org.json.JSONObject;


public class MetaData extends Task {//创建一个继承 Task 的类MataData
    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

    private String mRelatedGid = null;//创建私有变量mRelatedGid，并初始化为null

    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
        try {
            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
        } catch (JSONException e) {//捕捉异常
            Log.e(TAG, "failed to put related gid");
        }
        setNotes(metaInfo.toString());
        setName(GTaskStringUtils.META_NOTE_NAME);//设置gtask的名字
    }

    public String getRelatedGid() {
        return mRelatedGid;
    }//获取相关联的Gid

    @Override
    public boolean isWorthSaving() {
        return getNotes() != null;
    }//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

    @Override
    public void setContentByRemoteJSON(JSONObject js) {//使用远程json数据对象设置元数据内容
        super.setContentByRemoteJSON(js);
        if (getNotes() != null) {//如果数据非空，获取jsono metainfo和相关gid
            try {
                JSONObject metaInfo = new JSONObject(getNotes().trim());
                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
            } catch (JSONException e) {//catch中的代码是进行异常处理的
                Log.w(TAG, "failed to get related gid");
                mRelatedGid = null;
            }
        }
    }

    @Override
    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
        // this function should not be called
        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
    }

    @Override
    public JSONObject getLocalJSONFromContent() {//从元数据内容中获取本地json对象，抛出异常
        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
    }

    @Override
    public int getSyncAction(Cursor c) {
        throw new IllegalAccessError("MetaData:getSyncAction should not be called");//非法参数异常
    }

}