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@ -122,8 +122,7 @@ public class SqlNote {
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private ArrayList<SqlData> mDataList;
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public SqlNote(Context context) {
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//初始化成员变量
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public SqlNote(Context context) {//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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@ -204,15 +203,13 @@ public class SqlNote {
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private void loadDataContent() {
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Cursor c = null;
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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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try {// 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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if (c.getCount() == 0) {// 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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@ -445,24 +442,22 @@ public class SqlNote {
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public void commit(boolean validateVersion) {
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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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if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {// 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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}// 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 {// 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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mId = Long.valueOf(uri.getPathSegments().get(1));// 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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} catch (NumberFormatException e) {// 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) {// 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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}// 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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@ -471,28 +466,28 @@ public class SqlNote {
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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");// 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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throw new IllegalStateException("Try to update note with invalid id"); // 抛出异常IllegalStateException
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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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result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("//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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+ 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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result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("// 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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+ 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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if (result == 0) {// 如果result为0,即没有更新记录,则打印警告日志
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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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}
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@ -502,9 +497,9 @@ public class SqlNote {
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sqlData.commit(mId, validateVersion, mVersion);
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}
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}
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}
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}// refresh local info
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// refresh local info
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loadFromCursor(mId);
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if (mType == Notes.TYPE_NOTE)
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loadDataContent();
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