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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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java
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// 导入所需的包和类
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package net.micode.notes.gtask.data;
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import android.database.Cursor; // 用于数据库查询结果的游标
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import android.util.Log; // 用于记录日志
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import net.micode.notes.tool.GTaskStringUtils; // 自定义的工具类，可能包含一些字符串处理的静态方法
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import org.json.JSONException; // JSON处理时可能抛出的异常
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import org.json.JSONObject; // JSON对象类
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// MetaData类，继承自Task类
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public class MetaData extends Task {
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// 定义日志标签，用于记录日志时区分来源
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private final static String TAG = MetaData.class.getSimpleName();
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// 定义一个私有成员变量，用于存储与元数据相关的GID
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private String mRelatedGid = null;
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// 设置元数据的方法，接收GID和包含元数据的JSONObject
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public void setMeta(String gid, JSONObject metaInfo) {
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try {
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// 将GID添加到metaInfo中，作为元数据的一部分
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metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
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} catch (JSONException e) {
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// 如果添加GID时发生JSON异常，则记录错误日志
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Log.e(TAG, "failed to put related gid");
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}
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// 将metaInfo转换为字符串，并设置为任务的笔记内容
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setNotes(metaInfo.toString());
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// 设置任务的名称为一个特定的字符串，表示这是一个元数据任务
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setName(GTaskStringUtils.META_NOTE_NAME);
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}
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// 获取与元数据相关的GID的方法
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public String getRelatedGid() {
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return mRelatedGid;
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}
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// 重写isWorthSaving方法，判断该元数据是否值得保存
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// 在这里，如果笔记内容不为空，则认为值得保存
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@Override
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public boolean isWorthSaving() {
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return getNotes() != null;
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}
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// 重写setContentByRemoteJSON方法，用于从远程JSON对象设置内容
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// 在这里，首先从远程JSON中恢复元数据，并尝试从中提取GID
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@Override
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public void setContentByRemoteJSON(JSONObject js) {
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super.setContentByRemoteJSON(js); // 调用父类的方法处理其他内容
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if (getNotes() != null) {
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try {
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// 将笔记内容（JSON字符串）转换为JSONObject
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JSONObject metaInfo = new JSONObject(getNotes().trim());
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// 从metaInfo中提取GID
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mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
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} catch (JSONException e) {
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// 如果提取GID时发生JSON异常，则记录警告日志，并将GID设置为null
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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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// 重写setContentByLocalJSON方法，但在这里抛出异常，表示该方法不应被调用
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// 因为元数据通常是从远程获取的，而不是从本地JSON设置的
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@Override
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public void setContentByLocalJSON(JSONObject js) {
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throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
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}
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// 重写getLocalJSONFromContent方法，但在这里抛出异常，表示该方法不应被调用
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// 因为元数据通常不需要转换为本地JSON表示
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@Override
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public JSONObject getLocalJSONFromContent() {
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throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
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}
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// 重写getSyncAction方法，但在这里抛出异常，表示该方法不应被调用
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// 因为元数据的同步逻辑可能与其他任务类型不同，或者根本不需要同步
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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");
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}
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}
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