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/*
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* 单个便签项
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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.model;//包名
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import android.content.ContentProviderOperation;//批量的更新、插入、删除数据
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import android.content.ContentProviderResult;//操作结果
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import android.content.ContentUris;//添加或者修改uri后面的ID
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import android.content.ContentValues;//存储基本数据类型的数据
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import android.content.Context;// 获取调用内容
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import android.content.OperationApplicationException;//操作数据容错
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import android.net.Uri;//Uri相关操作，标识唯一的资源
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import android.os.RemoteException;//异常处理
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import android.util.Log;//输出日志，比如说出错、警告等
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import net.micode.notes.data.Notes;//小米便签一些属性的操作
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import net.micode.notes.data.Notes.CallNote;//调用操作
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import net.micode.notes.data.Notes.DataColumns;//数据栏
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import net.micode.notes.data.Notes.NoteColumns;//笔记栏
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import net.micode.notes.data.Notes.TextNote;//操作区
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import java.util.ArrayList;//导入Java,util,ArrayList
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public class Note {//定义note类，处理单个便签
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private ContentValues mNoteDiffValues;//声明一个ContentValues私有变量ContentValues，用来存储note与上次修改后的改动
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private NoteData mNoteData;//声明一个私有变量NoteData，用来记录单个便签的基本信息
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private static final String TAG = "Note";//设置软件标签
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/**
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* Create a new note id for adding a new note to databases
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*/
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public static synchronized long getNewNoteId(Context context, long folderId) {
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//Create a new note in the database
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/*
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* 作用：为新便签在数据库里边创建一个新的ID
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* 实现：创建一个内容集合，存入创建便签的时间，最后修改的时间，再根据当前便签所处的上下文和文件夹的ID，从内容解析器中得到的路径uri里面
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* 获取新的便签的ID。最后判断ID是否合法，然后返回
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* 参数：@context：便签所处的上下文
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* @folderId：所处的便签文件夹ID
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* @return：新创建便签的ID
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*/
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ContentValues values = new ContentValues();
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long createdTime = System.currentTimeMillis();
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values.put(NoteColumns.CREATED_DATE, createdTime);
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values.put(NoteColumns.MODIFIED_DATE, createdTime);
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values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
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values.put(NoteColumns.LOCAL_MODIFIED, 1);
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values.put(NoteColumns.PARENT_ID, folderId);
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Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
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long noteId = 0;
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try {
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noteId = Long.valueOf(uri.getPathSegments().get(1));
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} catch (NumberFormatException e) {
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Log.e(TAG, "Get note id error :" + e.toString());
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noteId = 0;
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}
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if (noteId == -1) {
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throw new IllegalStateException("Wrong note id:" + noteId);
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}
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return noteId;
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}
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public Note() {//定义两个变量用来存储便签的数据，一个是存储便签属性、一个是存储便签内容
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mNoteDiffValues = new ContentValues();
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mNoteData = new NoteData();
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}
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public void setNoteValue(String key, String value) {
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/*
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* 作用：设置便签的属性
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* 实现：通过传入key，指定修改便签的属性；传入value，指定修改的值，通过属性管理器mNoteDiffValues写入。最后，改变最后修改时间
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* 参数：@key：要修改的属性
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* @value：要修改的值
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*/
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mNoteDiffValues.put(key, value);
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mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
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mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
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}
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public void setTextData(String key, String value) {//设置数据库表格的标签文本内容的数据
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mNoteData.setTextData(key, value);
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}
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public void setTextDataId(long id) {//设置文本数据的ID
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mNoteData.setTextDataId(id);
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}
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public long getTextDataId() {//获取文本数据的ID
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return mNoteData.mTextDataId;
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}
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public void setCallDataId(long id) {//设置电话号码数据的ID
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mNoteData.setCallDataId(id);
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}
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public void setCallData(String key, String value) {//设置电话号码的数据
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mNoteData.setCallData(key, value);
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}
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public boolean isLocalModified() {//判断便签是否进行了本地修改
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return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
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}
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public boolean syncNote(Context context, long noteId) {//判断对修改过的便签是否进行同步
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if (noteId <= 0) {
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throw new IllegalArgumentException("Wrong note id:" + noteId);
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}
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if (!isLocalModified()) {
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return true;
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}
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/**
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* In theory, once data changed, the note should be updated on {@link NoteColumns#LOCAL_MODIFIED} and
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* {@link NoteColumns#MODIFIED_DATE}. For data safety, though update note fails, we also update the
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* note data info
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*/
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if (context.getContentResolver().update(
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ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
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null) == 0) {
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Log.e(TAG, "Update note error, should not happen");
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// Do not return, fall through
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}
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mNoteDiffValues.clear();
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if (mNoteData.isLocalModified()
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&& (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
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return false;
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}
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return true;
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}
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private class NoteData {//定义一个基本的便签内容的数据类，主要包含文本数据和电话号码数据
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private long mTextDataId;//文本数据id
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private ContentValues mTextDataValues;//文本数据内容
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private long mCallDataId;//电话号码数据ID
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private ContentValues mCallDataValues;//电话号码数据内容
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private static final String TAG = "NoteData";//默认构造函数
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public NoteData() {//NoteData的构造函数，初始化四个变量
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mTextDataValues = new ContentValues();
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mCallDataValues = new ContentValues();
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mTextDataId = 0;
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mCallDataId = 0;
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}
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boolean isLocalModified() {//判断是否本地修改
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return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
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}
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void setTextDataId(long id) {//设置文本数据的ID
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if(id <= 0) {
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throw new IllegalArgumentException("Text data id should larger than 0");
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}
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mTextDataId = id;
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}
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void setCallDataId(long id) {//设置电话号码对应的id
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if (id <= 0) {
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throw new IllegalArgumentException("Call data id should larger than 0");
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}
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mCallDataId = id;
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}
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void setCallData(String key, String value) {//设置电话号码数据内容，并且保存修改时间
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mCallDataValues.put(key, value);
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mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
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mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
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}
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void setTextData(String key, String value) {//设置文本数据
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mTextDataValues.put(key, value);
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mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
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mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
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}
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Uri pushIntoContentResolver(Context context, long noteId) {//使用uri将数据添加到数据库
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/**
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* Check for safety
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*/
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if (noteId <= 0) {//判断数据是否合法
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throw new IllegalArgumentException("Wrong note id:" + noteId);
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}
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ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
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ContentProviderOperation.Builder builder = null;
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if(mTextDataValues.size() > 0) {//把文本数据存入DataColumns
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mTextDataValues.put(DataColumns.NOTE_ID, noteId);
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if (mTextDataId == 0) {//文本数据ID为零，意味着这个id是新建默认的id
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mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE);
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Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
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mTextDataValues);
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try {
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setTextDataId(Long.valueOf(uri.getPathSegments().get(1)));
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} catch (NumberFormatException e) {
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Log.e(TAG, "Insert new text data fail with noteId" + noteId);
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mTextDataValues.clear();
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return null;
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}
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} else {
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builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
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Notes.CONTENT_DATA_URI, mTextDataId));
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builder.withValues(mTextDataValues);
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operationList.add(builder.build());
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}
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mTextDataValues.clear();
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}
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if(mCallDataValues.size() > 0) {//电话号码同步
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mCallDataValues.put(DataColumns.NOTE_ID, noteId);
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if (mCallDataId == 0) {//将电话号码的id设定为uri提供的id
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mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE);
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Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
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mCallDataValues);
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try {
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setCallDataId(Long.valueOf(uri.getPathSegments().get(1)));
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} catch (NumberFormatException e) {
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Log.e(TAG, "Insert new call data fail with noteId" + noteId);
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mCallDataValues.clear();
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return null;
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}
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} else {//当电话号码不为新建时，更新电话号码ID
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builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
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Notes.CONTENT_DATA_URI, mCallDataId));
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builder.withValues(mCallDataValues);
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operationList.add(builder.build());
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}
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mCallDataValues.clear();
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}
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if (operationList.size() > 0) {//存储过程中如果遇到异常，通过如下进行处理
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try {//抛出远程异常，并写回日志
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ContentProviderResult[] results = context.getContentResolver().applyBatch(
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Notes.AUTHORITY, operationList);
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return (results == null || results.length == 0 || results[0] == null) ? null
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: ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);
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} catch (RemoteException e) {//捕捉操作异常并写回日志
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Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
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return null;
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} catch (OperationApplicationException e) {
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Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));//异常日志
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return null;
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}
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}
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return null;
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}
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}
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}
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