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@ -123,34 +123,35 @@ public class SqlNote {
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private ArrayList<SqlData> mDataList;
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public SqlNote(Context context) {
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mContext = context;
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mContentResolver = context.getContentResolver();
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mIsCreate = true;
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mId = INVALID_ID;
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mAlertDate = 0;
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mBgColorId = ResourceParser.getDefaultBgId(context);
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mCreatedDate = System.currentTimeMillis();
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mHasAttachment = 0;
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mModifiedDate = System.currentTimeMillis();
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mParentId = 0;
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mSnippet = "";
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mType = Notes.TYPE_NOTE;
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mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
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mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
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mOriginParent = 0;
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mVersion = 0;
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mDiffNoteValues = new ContentValues();
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mDataList = new ArrayList<SqlData>();
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//初始化成员变量
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mContext = context;// 上下文
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mContentResolver = context.getContentResolver();// 获取内容解析器
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mIsCreate = true; // 是否为新建笔记
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mId = INVALID_ID; // 笔记ID
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mAlertDate = 0; // 提醒时间
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mBgColorId = ResourceParser.getDefaultBgId(context); // 背景颜色ID
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mCreatedDate = System.currentTimeMillis(); // 创建时间
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mHasAttachment = 0; // 是否有附件
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mModifiedDate = System.currentTimeMillis(); // 修改时间
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mParentId = 0; // 所属父笔记ID
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mSnippet = ""; // 笔记摘要
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mType = Notes.TYPE_NOTE; // 笔记类型
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mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID; // 小部件ID
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mWidgetType = Notes.TYPE_WIDGET_INVALIDE; // 小部件类型
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mOriginParent = 0; // 原始的父笔记ID
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mVersion = 0; // 笔记版本
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mDiffNoteValues = new ContentValues(); // 存储笔记差异内容的 ContentValues 对象
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mDataList = new ArrayList<SqlData>(); // 存储笔记数据的 ArrayList
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}
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public SqlNote(Context context, Cursor c) {
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mContext = context;
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mContentResolver = context.getContentResolver();
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mIsCreate = false;
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loadFromCursor(c);
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loadFromCursor(c); // 从Cursor加载笔记数据
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mDataList = new ArrayList<SqlData>();
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if (mType == Notes.TYPE_NOTE)
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loadDataContent();
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loadDataContent(); // 加载笔记内容
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mDiffNoteValues = new ContentValues();
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}
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@ -158,10 +159,10 @@ public class SqlNote {
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mContext = context;
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mContentResolver = context.getContentResolver();
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mIsCreate = false;
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loadFromCursor(id);
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loadFromCursor(id); // 根据ID从数据库中加载笔记数据
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mDataList = new ArrayList<SqlData>();
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if (mType == Notes.TYPE_NOTE)
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loadDataContent();
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loadDataContent(); // 加载笔记内容
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mDiffNoteValues = new ContentValues();
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}
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@ -175,7 +176,7 @@ public class SqlNote {
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}, null);
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if (c != null) {
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c.moveToNext();
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loadFromCursor(c);
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loadFromCursor(c);// 从Cursor加载笔记数据
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} else {
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Log.w(TAG, "loadFromCursor: cursor = null");
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}
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@ -186,43 +187,45 @@ public class SqlNote {
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}
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private void loadFromCursor(Cursor c) {
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mId = c.getLong(ID_COLUMN);
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mAlertDate = c.getLong(ALERTED_DATE_COLUMN);
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mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);
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mCreatedDate = c.getLong(CREATED_DATE_COLUMN);
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mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);
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mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);
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mParentId = c.getLong(PARENT_ID_COLUMN);
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mSnippet = c.getString(SNIPPET_COLUMN);
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mType = c.getInt(TYPE_COLUMN);
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mWidgetId = c.getInt(WIDGET_ID_COLUMN);
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mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
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mVersion = c.getLong(VERSION_COLUMN);
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mId = c.getLong(ID_COLUMN); // 加载ID数据
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mAlertDate = c.getLong(ALERTED_DATE_COLUMN); // 加载提醒日期数据
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mBgColorId = c.getInt(BG_COLOR_ID_COLUMN); // 加载背景颜色ID数据
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mCreatedDate = c.getLong(CREATED_DATE_COLUMN); // 加载创建日期数据
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mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN); // 加载附件存在标记数据
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mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN); // 加载修改日期数据
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mParentId = c.getLong(PARENT_ID_COLUMN); // 加载父级ID数据
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mSnippet = c.getString(SNIPPET_COLUMN); // 加载摘要数据
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mType = c.getInt(TYPE_COLUMN); // 加载类型数据
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mWidgetId = c.getInt(WIDGET_ID_COLUMN); // 加载小部件ID数据
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mWidgetType = c.getInt(WIDGET_TYPE_COLUMN); // 加载小部件类型数据
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mVersion = c.getLong(VERSION_COLUMN); // 加载版本号数据
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}
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private void loadDataContent() {
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Cursor c = null;
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mDataList.clear();
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mDataList.clear();// 清空数据列表
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try {
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// 通过ContentResolver从Content Provider查询数据内容
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c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
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"(note_id=?)", new String[] {
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String.valueOf(mId)
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}, null);
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if (c != null) {
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if (c.getCount() == 0) {
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// 数据内容为空
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Log.w(TAG, "it seems that the note has not data");
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return;
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}
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while (c.moveToNext()) {
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while (c.moveToNext()) {// 遍历Cursor，创建SqlData对象并添加到数据列表中
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SqlData data = new SqlData(mContext, c);
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mDataList.add(data);
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}
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} else {
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Log.w(TAG, "loadDataContent: cursor = null");
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}
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} finally {
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} finally { // Cursor为空
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if (c != null)
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c.close();
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c.close();// 关闭Cursor
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}
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}
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@ -441,22 +444,25 @@ public class SqlNote {
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}
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public void commit(boolean validateVersion) {
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if (mIsCreate) {
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if (mIsCreate) {// 判断当前对象是否为新建对象。如果是，则执行以下代码块。
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if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
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// 如果当前对象的id为无效id，并且mDiffNoteValues中包含NoteColumns.ID这个键，则移除该键值对。
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mDiffNoteValues.remove(NoteColumns.ID);
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}
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// 通过ContentResolver向Notes表中插入一条记录，第一部分是插入的uri。
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Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
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try {
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try {// 试图从uri的路径段中获取note的id。
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// 将获取到的id转换为long类型并赋值给mId。如果转换失败，会抛出NumberFormatException异常。
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mId = Long.valueOf(uri.getPathSegments().get(1));
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} catch (NumberFormatException e) {
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// 记录错误日志，创建note失败。抛出ActionFailureException异常，异常信息为create note failed。
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Log.e(TAG, "Get note id error :" + e.toString());
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throw new ActionFailureException("create note failed");
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}
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if (mId == 0) {
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if (mId == 0) {// 如果mId仍然为0，抛出一个IllegalStateException异常，创建thread id失败。
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throw new IllegalStateException("Create thread id failed");
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}
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// 如果mType等于Notes.TYPE_NOTE，执行以下代码块。
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if (mType == Notes.TYPE_NOTE) {
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for (SqlData sqlData : mDataList) {
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sqlData.commit(mId, false, -1);
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@ -464,24 +470,28 @@ public class SqlNote {
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}
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} else {
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if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
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Log.e(TAG, "No such note");
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Log.e(TAG, "No such note");// 打印错误日志"No such note
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// 抛出异常IllegalStateException
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throw new IllegalStateException("Try to update note with invalid id");
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}
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if (mDiffNoteValues.size() > 0) {
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mVersion ++;
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int result = 0;
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if (!validateVersion) {
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//更新Notes表中的记录，将mDiffNoteValues中的键值对更新到Notes表中
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result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
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+ NoteColumns.ID + "=?)", new String[] {
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String.valueOf(mId)
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});
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} else {
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// 更新Notes表中的记录，将mDiffNoteValues中的键值对更新到Notes表中
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result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
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+ NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
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new String[] {
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String.valueOf(mId), String.valueOf(mVersion)
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});
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}
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// 如果result为0，即没有更新记录，则打印警告日志
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if (result == 0) {
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Log.w(TAG, "there is no update. maybe user updates note when syncing");
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}
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