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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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package net.micode.notes.tool;
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import android.content.Context;
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import android.database.Cursor;
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import android.os.Environment;
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import android.text.TextUtils;
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import android.text.format.DateFormat;
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import android.util.Log;
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.PrintStream;
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public class BackupUtils {
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private static final String TAG = "BackupUtils";
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// Singleton stuff
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private static BackupUtils sInstance;
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//ynchronized 关键字，代表这个方法加锁,防止多进程混乱
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if (sInstance == null) {
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//如果当前备份不存在，则新声明一个
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sInstance = new BackupUtils(context);
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}
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return sInstance;
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}
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// 当前 SD 卡未挂载
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public static final int STATE_SD_CARD_UNMOUONTED = 0;
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// 文件不存在
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public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
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// 数据格式损坏（可能被其他程序修改）
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public static final int STATE_DATA_DESTROIED = 2;
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// 运行时异常导致备份/恢复失败
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public static final int STATE_SYSTEM_ERROR = 3;
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// 备份或重新储存成功？？？
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public static final int STATE_SUCCESS = 4;
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//文本提取
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private TextExport mTextExport;
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//初始化类，将该类设置为context接口格式，提供了访问资源、启动组件、获取系统服务、管理文件、执行权限检查等。
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private BackupUtils(Context context) {
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mTextExport = new TextExport(context);
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}
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// 获取外部存储的根目录，便于进行api操作
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private static boolean externalStorageAvailable() {
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return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
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}
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// mTextExport是一个静态内部类,提供了导出功能
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public int exportToText() {
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return mTextExport.exportToText();
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}
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public String getExportedTextFileName() {
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return mTextExport.mFileName;
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}
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public String getExportedTextFileDir() {
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return mTextExport.mFileDirectory;
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}
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private static class TextExport {
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private static final String[] NOTE_PROJECTION = { //文本基础信息
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NoteColumns.ID,
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NoteColumns.MODIFIED_DATE,
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NoteColumns.SNIPPET, //文本片段
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NoteColumns.TYPE
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};
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//定义类级别的常量.p s f，下面的 数字代表在字符串中存储位置
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private static final int NOTE_COLUMN_ID = 0;
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private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
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private static final int NOTE_COLUMN_SNIPPET = 2;
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private static final String[] DATA_PROJECTION = { //数据基础信息，这个数据是啥数据？？？
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DataColumns.CONTENT,
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DataColumns.MIME_TYPE,
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DataColumns.DATA1,
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DataColumns.DATA2,
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DataColumns.DATA3,
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DataColumns.DATA4,
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};
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private static final int DATA_COLUMN_CONTENT = 0;
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private static final int DATA_COLUMN_MIME_TYPE = 1; //导出笔记时，先查询这条笔记的 DATA_COLUMN_MIME_TYPE 值，判断格式
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private static final int DATA_COLUMN_CALL_DATE = 2;
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private static final int DATA_COLUMN_PHONE_NUMBER = 4;
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private final String [] TEXT_FORMAT;
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private static final int FORMAT_FOLDER_NAME = 0;
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private static final int FORMAT_NOTE_DATE = 1;
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private static final int FORMAT_NOTE_CONTENT = 2;
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private Context mContext;
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private String mFileName;
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private String mFileDirectory;
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public TextExport(Context context) {
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TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);//从array.xml里获取字符串数组信息
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mContext = context;
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mFileName = "";
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mFileDirectory = "";
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}
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private String getFormat(int id) {
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return TEXT_FORMAT[id];
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}
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/**
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* Export the folder identified by folder id to text ，从文件夹流向便签
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*/
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private void exportFolderToText(String folderId, PrintStream ps) {
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// Query notes belong to this folder
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Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
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folderId //引用的别的类的啥？？父母ID
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}, null);
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if (notesCursor != null) { //遍历cursor的数据
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if (notesCursor.moveToFirst()) { //在开头
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do {
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// Print note's last modified date
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ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
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mContext.getString(R.string.format_datetime_mdhm), //R.string.xxx 是一个引用字符串资源的标识符，它直接指向资源文件中的字符串,用gststring执行
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notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE)))); //getXX，XX是结构
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// Query data belong to this note
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String noteId = notesCursor.getString(NOTE_COLUMN_ID);
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exportNoteToText(noteId, ps);
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} while (notesCursor.moveToNext()); //没有下一个就终止，代表数据遍历完毕
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}
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notesCursor.close();
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}
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}
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/**
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* Export note identified by id to a print stream，从便签流向文本流
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*/
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private void exportNoteToText(String noteId, PrintStream ps) {
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Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI,
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DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
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noteId
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}, null);
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if (dataCursor != null) {
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if (dataCursor.moveToFirst()) {
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do {
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String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
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if (DataConstants.CALL_NOTE.equals(mimeType)) { //有电话的note
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// Print phone number
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String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
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long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
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String location = dataCursor.getString(DATA_COLUMN_CONTENT);
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if (!TextUtils.isEmpty(phoneNumber)) {
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), //在导出内容时，把phoneNumber填充到 “笔记内容的格式模板” 并打印出来
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phoneNumber));
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}
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// Print call date
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
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.format(mContext.getString(R.string.format_datetime_mdhm),
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callDate)));
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// Print call attachment location
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if (!TextUtils.isEmpty(location)) {
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
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location));
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}
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} else if (DataConstants.NOTE.equals(mimeType)) {
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String content = dataCursor.getString(DATA_COLUMN_CONTENT);
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if (!TextUtils.isEmpty(content)) {
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
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content));
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}
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}
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} while (dataCursor.moveToNext());
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}
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dataCursor.close();
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}
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// print a line separator between note
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try {
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ps.write(new byte[] {
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Character.LINE_SEPARATOR, Character.LETTER_NUMBER
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});
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} catch (IOException e) {
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Log.e(TAG, e.toString());
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}
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}
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/**
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* Note will be exported as text which is user readable ,下面的是主函数
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*/
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public int exportToText() {
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//判断两个失败条件
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if (!externalStorageAvailable()) {
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Log.d(TAG, "Media was not mounted");
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return STATE_SD_CARD_UNMOUONTED;
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}
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PrintStream ps = getExportToTextPrintStream();
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if (ps == null) {
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Log.e(TAG, "get print stream error");
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return STATE_SYSTEM_ERROR;
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}
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// First export folder and its notes 输出在文件夹中的便签
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Cursor folderCursor = mContext.getContentResolver().query(
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Notes.CONTENT_NOTE_URI,
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NOTE_PROJECTION,
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"(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
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+ NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
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+ NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null); //xinxi
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if (folderCursor != null) {
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if (folderCursor.moveToFirst()) {
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do {
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// Print folder's name
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String folderName = "";
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if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) { //这个判断何意味，为啥一个cursor一个context
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folderName = mContext.getString(R.string.call_record_folder_name); //Context.getString 是 Android 中用于从资源文件中获取字符串的方法
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} else { //cursor.getString 是 Android 中用于从数据库中获取字符串类型数据的方法
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folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);
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}
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if (!TextUtils.isEmpty(folderName)) {
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ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
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}
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String folderId = folderCursor.getString(NOTE_COLUMN_ID);
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exportFolderToText(folderId, ps);
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} while (folderCursor.moveToNext());
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}
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folderCursor.close();
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}
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// Export notes in root's folder，输出根目录中的便签
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Cursor noteCursor = mContext.getContentResolver().query(
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Notes.CONTENT_NOTE_URI,
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NOTE_PROJECTION,
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NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
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+ "=0", null, null);
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if (noteCursor != null) {
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if (noteCursor.moveToFirst()) {
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do {
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ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
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mContext.getString(R.string.format_datetime_mdhm),
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noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
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// Query data belong to this note
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String noteId = noteCursor.getString(NOTE_COLUMN_ID);
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exportNoteToText(noteId, ps);
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} while (noteCursor.moveToNext());
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}
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noteCursor.close();
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}
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ps.close();
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return STATE_SUCCESS; //都能对应上
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}
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/**
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* Get a print stream pointed to the file {@generateExportedTextFile} ，
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*/
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private PrintStream getExportToTextPrintStream() {
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File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
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R.string.file_name_txt_format); //建一个指向 SD 卡指定目录的 TXT 导出文件
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if (file == null) {
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Log.e(TAG, "create file to exported failed");
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return null;
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}
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mFileName = file.getName();
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mFileDirectory = mContext.getString(R.string.file_path);
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PrintStream ps = null;
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try { //try catch语法
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FileOutputStream fos = new FileOutputStream(file);
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ps = new PrintStream(fos); //返回操作该文件的 PrintStream 输出流
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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return null;
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} catch (NullPointerException e) {
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e.printStackTrace();
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return null;
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}
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return ps;
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}
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}
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/**
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* Generate the text file to store imported data把笔记内容（比如之前的电话号码、笔记正文）写入到 TXT 文件中。
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*/
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private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
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StringBuilder sb = new StringBuilder();
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sb.append(Environment.getExternalStorageDirectory());
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sb.append(context.getString(filePathResId));
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File filedir = new File(sb.toString());
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sb.append(context.getString(
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fileNameFormatResId,
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DateFormat.format(context.getString(R.string.format_date_ymd),
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System.currentTimeMillis())));
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File file = new File(sb.toString()); //stringbuilder转成srting再写进file
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try {
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if (!filedir.exists()) {
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filedir.mkdir(); //文件目录
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}
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if (!file.exists()) {
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file.createNewFile(); //文件
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}
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return file;
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} catch (SecurityException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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}
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