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@ -36,12 +36,16 @@ import net.micode.notes.data.NotesDatabaseHelper.TABLE;
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public class NotesProvider extends ContentProvider {
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// 创建一个UriMatcher对象，用于匹配URI
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private static final UriMatcher mMatcher;
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// 创建一个NotesDatabaseHelper对象，用于操作数据库
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private NotesDatabaseHelper mHelper;
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// 创建一个TAG，用于标记日志
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private static final String TAG = "NotesProvider";
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// 创建一个URI码，用于表示不同的URI
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private static final int URI_NOTE = 1;
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private static final int URI_NOTE_ITEM = 2;
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private static final int URI_DATA = 3;
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@ -50,6 +54,7 @@ public class NotesProvider extends ContentProvider {
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private static final int URI_SEARCH = 5;
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private static final int URI_SEARCH_SUGGEST = 6;
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// 静态初始化，创建一个UriMatcher对象，用于匹配URI
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static {
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
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@ -81,6 +86,7 @@ public class NotesProvider extends ContentProvider {
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@Override
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public boolean onCreate() {
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// 获取NotesDatabaseHelper实例
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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return true;
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}
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@ -88,99 +94,136 @@ public class NotesProvider extends ContentProvider {
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@Override
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public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
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String sortOrder) {
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// 初始化游标
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Cursor c = null;
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// 获取可读的数据库
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SQLiteDatabase db = mHelper.getReadableDatabase();
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// 初始化id
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String id = null;
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// 根据uri匹配模式
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switch (mMatcher.match(uri)) {
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// 查询note表
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case URI_NOTE:
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// 查询note表，并设置查询条件
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
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sortOrder);
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break;
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// 查询note表中的某一行
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case URI_NOTE_ITEM:
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// 获取id
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id = uri.getPathSegments().get(1);
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// 查询note表，并设置查询条件
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c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);
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break;
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// 查询data表
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case URI_DATA:
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// 查询data表，并设置查询条件
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
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sortOrder);
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break;
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// 查询data表中的某一行
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case URI_DATA_ITEM:
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// 获取id
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id = uri.getPathSegments().get(1);
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// 查询data表，并设置查询条件
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c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);
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break;
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// 查询搜索建议
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case URI_SEARCH:
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case URI_SEARCH_SUGGEST:
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// 检查排序，查询条件，查询参数是否有效
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if (sortOrder != null || projection != null) {
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throw new IllegalArgumentException(
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"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
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}
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// 初始化搜索字符串
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String searchString = null;
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// 根据uri匹配模式，获取搜索字符串
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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// 如果uri中包含路径段，则获取路径段
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if (uri.getPathSegments().size() > 1) {
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searchString = uri.getPathSegments().get(1);
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}
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} else {
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// 从uri中获取查询参数
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searchString = uri.getQueryParameter("pattern");
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}
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// 如果搜索字符串为空，则返回空游标
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if (TextUtils.isEmpty(searchString)) {
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return null;
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}
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try {
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// 将搜索字符串格式化
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searchString = String.format("%%%s%%", searchString);
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// 查询note表，并设置查询条件
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c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
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new String[] { searchString });
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} catch (IllegalStateException ex) {
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Log.e(TAG, "got exception: " + ex.toString());
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}
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break;
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// 未知uri
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 如果游标不为空，则设置通知uri
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if (c != null) {
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c.setNotificationUri(getContext().getContentResolver(), uri);
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}
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// 返回游标
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return c;
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}
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@Override
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@Override
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public Uri insert(Uri uri, ContentValues values) {
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// 获取可写的数据库
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SQLiteDatabase db = mHelper.getWritableDatabase();
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// 定义变量
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long dataId = 0, noteId = 0, insertedId = 0;
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// 根据uri匹配
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switch (mMatcher.match(uri)) {
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// 匹配到note uri
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case URI_NOTE:
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// 插入note
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);
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break;
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// 匹配到data uri
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case URI_DATA:
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// 判断note id是否存在
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if (values.containsKey(DataColumns.NOTE_ID)) {
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noteId = values.getAsLong(DataColumns.NOTE_ID);
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} else {
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Log.d(TAG, "Wrong data format without note id:" + values.toString());
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}
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// 插入data
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insertedId = dataId = db.insert(TABLE.DATA, null, values);
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break;
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// 匹配到其他uri
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// Notify the note uri
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// 通知note uri
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if (noteId > 0) {
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getContext().getContentResolver().notifyChange(
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ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
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}
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// Notify the data uri
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// 通知data uri
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if (dataId > 0) {
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getContext().getContentResolver().notifyChange(
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ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
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}
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// 返回插入的id
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return ContentUris.withAppendedId(uri, insertedId);
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}
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@Override
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public int delete(Uri uri, String selection, String[] selectionArgs) {
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int count = 0;
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@ -228,28 +271,34 @@ public class NotesProvider extends ContentProvider {
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}
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@Override
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public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
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public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
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int count = 0;
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean updateData = false;
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 增加版本号
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increaseNoteVersion(-1, selection, selectionArgs);
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count = db.update(TABLE.NOTE, values, selection, selectionArgs);
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break;
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case URI_NOTE_ITEM:
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// 获取id
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id = uri.getPathSegments().get(1);
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// 增加版本号
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
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count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs);
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break;
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case URI_DATA:
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// 更新数据
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count = db.update(TABLE.DATA, values, selection, selectionArgs);
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updateData = true;
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break;
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case URI_DATA_ITEM:
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// 获取id
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id = uri.getPathSegments().get(1);
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// 更新数据
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count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs);
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updateData = true;
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@ -260,18 +309,22 @@ public class NotesProvider extends ContentProvider {
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if (count > 0) {
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if (updateData) {
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// 通知更新数据
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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// 通知更新笔记
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getContext().getContentResolver().notifyChange(uri, null);
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}
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return count;
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}
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private String parseSelection(String selection) {
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private String parseSelection(String selection) {
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// 解析选择语句，返回一个字符串
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
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}
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private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
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// 增加笔记的版本
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StringBuilder sql = new StringBuilder(120);
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sql.append("UPDATE ");
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sql.append(TABLE.NOTE);
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@ -299,7 +352,7 @@ public class NotesProvider extends ContentProvider {
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@Override
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public String getType(Uri uri) {
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// TODO Auto-generated method stub
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// 获取URI的类型
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return null;
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}
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}
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dingxinnan