/* * 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; import android.database.Cursor; import android.util.Log; import net.micode.notes.tool.GTaskStringUtils; import org.json.JSONException; import org.json.JSONObject; // 定义一个名为MetaData的类,它继承自Task类 public class MetaData extends Task { // 定义一个静态常量TAG,用于日志记录时标识这个类 private final static String TAG = MetaData.class.getSimpleName(); // 定义一个私有变量mRelatedGid,用于存储相关的gid(全局唯一标识符) private String mRelatedGid = null; // 定义一个方法,用于设置元数据 // 参数gid是全局唯一标识符,metaInfo是包含元数据的JSONObject public void setMeta(String gid, JSONObject metaInfo) { try { // 将gid添加到metaInfo中,键为GTaskStringUtils.META_HEAD_GTASK_ID metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid); } catch (JSONException e) { // 如果添加失败,则记录错误日志 Log.e(TAG, "failed to put related gid"); } // 调用setNotes方法,将metaInfo的字符串表示形式设置为任务的备注 setNotes(metaInfo.toString()); // 设置任务的名称为预设的元数据名称 setName(GTaskStringUtils.META_NOTE_NAME); } // 定义一个方法,用于获取相关的gid public String getRelatedGid() { return mRelatedGid; } // 重写isWorthSaving方法,判断这个MetaData对象是否值得保存 // 如果备注(即元数据)不为null,则认为值得保存 @Override public boolean isWorthSaving() { return getNotes() != null; } // 重写setContentByRemoteJSON方法,用于从远程JSON对象中设置内容 // 首先调用父类的同名方法,然后从备注中提取JSON对象,并获取gid @Override public void setContentByRemoteJSON(JSONObject js) { super.setContentByRemoteJSON(js); if (getNotes() != null) { try { JSONObject metaInfo = new JSONObject(getNotes().trim()); mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID); } catch (JSONException e) { // 如果获取gid失败,则记录警告日志,并将mRelatedGid设置为null Log.w(TAG, "failed to get related gid"); mRelatedGid = null; } } } // 重写setContentByLocalJSON方法,由于这个方法不应该被调用,所以抛出IllegalAccessError异常 @Override public void setContentByLocalJSON(JSONObject js) { // this function should not be called throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called"); } // 重写getLocalJSONFromContent方法,同样由于不应该被调用,抛出IllegalAccessError异常 @Override public JSONObject getLocalJSONFromContent() { throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called"); } // 重写getSyncAction方法,由于不应该被调用,抛出IllegalAccessError异常 // 这个方法通常用于同步操作,但在这个MetaData类中不适用 @Override public int getSyncAction(Cursor c) { throw new IllegalAccessError("MetaData:getSyncAction should not be called"); } }