5MI/MetaData.java

// 多行注释，说明版权信息和许可证
/*
 * 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.
 */

// 导入所需的类
package net.micode.notes.gtask.data;

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

import net.micode.notes.tool.GTaskStringUtils;

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

// MetaData类继承自Task类，用于处理与任务相关的元数据
public class MetaData extends Task {
    // 类的标签，用于日志记录
    private final static String TAG = MetaData.class.getSimpleName();

    // 用于存储相关任务的全局唯一标识符
    private String mRelatedGid = null;

    // 设置元数据信息
    public void setMeta(String gid, JSONObject metaInfo) {
        try {
            // 将全局唯一标识符添加到元数据信息中
            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
        } catch (JSONException e) {
            // 如果添加失败，记录错误日志
            Log.e(TAG, "failed to put related gid");
        }
        // 设置任务的备注信息为元数据的字符串表示
        setNotes(metaInfo.toString());
        // 设置任务的名称为特定的元数据任务名称
        setName(GTaskStringUtils.META_NOTE_NAME);
    }

    // 获取相关任务的全局唯一标识符
    public String getRelatedGid() {
        return mRelatedGid;
    }

    // 重写isWorthSaving方法，判断任务是否值得保存
    @Override
    public boolean isWorthSaving() {
        // 如果任务的备注信息不为空，则认为值得保存
        return getNotes() != null;
    }

    // 从远程JSON对象设置内容
    @Override
    public void setContentByRemoteJSON(JSONObject js) {
        // 首先调用父类的设置内容方法
        super.setContentByRemoteJSON(js);
        // 如果备注信息不为空
        if (getNotes() != null) {
            try {
                // 将备注信息转换为JSON对象，并获取全局唯一标识符
                JSONObject metaInfo = new JSONObject(getNotes().trim());
                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
            } catch (JSONException e) {
                // 如果转换失败，记录警告日志，并设置全局唯一标识符为null
                Log.w(TAG, "failed to get related gid");
                mRelatedGid = null;
            }
        }
    }

    // 从本地JSON对象设置内容，此方法不应该被调用
    @Override
    public void setContentByLocalJSON(JSONObject js) {
        // 如果被调用，抛出异常
        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
    }

    // 从内容获取本地JSON对象，此方法不应该被调用
    @Override
    public JSONObject getLocalJSONFromContent() {
        // 如果被调用，抛出异常
        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
    }

    // 获取同步操作，此方法不应该被调用
    @Override
    public int getSyncAction(Cursor c) {
        // 如果被调用，抛出异常
        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
    }
}