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@ -35,35 +35,65 @@ import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.data.NotesDatabaseHelper.TABLE;
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/**
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* 小米便签内容提供者
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* 实现了ContentProvider接口，提供便签数据的增删改查功能
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* 支持便签和文件夹的管理，以及搜索和搜索建议功能
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*/
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public class NotesProvider extends ContentProvider {
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/**
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* URI匹配器，用于将请求的URI映射到对应的处理逻辑
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*/
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private static final UriMatcher mMatcher;
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/**
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* 数据库帮助类实例，用于获取数据库连接
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*/
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private NotesDatabaseHelper mHelper;
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/**
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* 日志标签，用于在日志系统中标识本类的日志信息
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*/
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private static final String TAG = "NotesProvider";
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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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private static final int URI_DATA_ITEM = 4;
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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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/**
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* URI类型常量，用于标识不同的请求类型
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* - URI_NOTE：查询所有便签和文件夹
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* - URI_NOTE_ITEM：查询单个便签或文件夹
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* - URI_DATA：查询所有便签数据
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* - URI_DATA_ITEM：查询单个便签数据
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* - URI_SEARCH：搜索便签
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* - URI_SEARCH_SUGGEST：搜索建议
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*/
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private static final int URI_NOTE = 1; // 所有便签和文件夹
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private static final int URI_NOTE_ITEM = 2; // 单个便签或文件夹
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private static final int URI_DATA = 3; // 所有便签数据
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private static final int URI_DATA_ITEM = 4; // 单个便签数据
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private static final int URI_SEARCH = 5; // 搜索便签
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private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议
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static {
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// 初始化URI匹配器，设置各种URI模式对应的处理类型
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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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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 匹配所有便签和文件夹
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 匹配单个便签或文件夹
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 匹配所有便签数据
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 匹配单个便签数据
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 匹配搜索请求
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 匹配搜索建议
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 匹配带参数的搜索建议
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}
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/**
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* x'0A' represents the '\n' character in sqlite. For title and content in the search result,
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* we will trim '\n' and white space in order to show more information.
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* 搜索结果的投影列定义
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* x'0A'代表SQLite中的'\n'字符。在搜索结果中，我们会去除'\n'和空白字符以显示更多信息
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* 定义了搜索建议需要的列：
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* - ID：便签ID
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* - SUGGEST_COLUMN_INTENT_EXTRA_DATA：用于传递便签ID
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* - SUGGEST_COLUMN_TEXT_1和TEXT_2：搜索建议显示的文本
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* - SUGGEST_COLUMN_ICON_1：搜索建议显示的图标
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* - SUGGEST_COLUMN_INTENT_ACTION：点击搜索建议时的动作
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* - SUGGEST_COLUMN_INTENT_DATA：点击搜索建议时的数据类型
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*/
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private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
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+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
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@ -73,65 +103,94 @@ public class NotesProvider extends ContentProvider {
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+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
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+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
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/**
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* 便签搜索查询语句
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* 用于根据关键词搜索便签，只搜索未删除的普通便签
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*/
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private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
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+ " FROM " + TABLE.NOTE
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
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+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 模糊匹配关键词
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+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除回收站中的便签
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 只搜索普通便签
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/**
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* 内容提供者创建时调用，初始化数据库帮助类实例
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* @return 初始化是否成功，始终返回true
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*/
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@Override
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public boolean onCreate() {
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// 获取数据库帮助类的单例实例
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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return true;
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}
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/**
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* 查询便签数据
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* @param uri 请求的URI
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* @param projection 返回的列
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* @param selection 查询条件
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* @param selectionArgs 查询条件参数
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* @param sortOrder 排序方式
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* @return 查询结果游标
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* @throws IllegalArgumentException 当请求的URI无效或参数不符合要求时抛出
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*/
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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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Cursor c = null;
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// 获取只读数据库连接
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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// 根据URI类型执行不同的查询逻辑
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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case URI_NOTE: // 查询所有便签和文件夹
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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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case URI_NOTE_ITEM:
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id = uri.getPathSegments().get(1);
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case URI_NOTE_ITEM: // 查询单个便签或文件夹
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id = uri.getPathSegments().get(1); // 从URI中获取ID
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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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case URI_DATA:
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case URI_DATA: // 查询所有便签数据
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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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case URI_DATA_ITEM:
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id = uri.getPathSegments().get(1);
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case URI_DATA_ITEM: // 查询单个便签数据
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id = uri.getPathSegments().get(1); // 从URI中获取ID
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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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case URI_SEARCH:
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case URI_SEARCH_SUGGEST:
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case URI_SEARCH: // 搜索便签
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case URI_SEARCH_SUGGEST: // 搜索建议
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// 搜索请求不允许指定排序方式和投影列
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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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// 获取搜索关键词
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String searchString = null;
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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// 从URI路径中获取搜索关键词
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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查询参数中获取搜索关键词
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searchString = uri.getQueryParameter("pattern");
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}
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// 如果搜索关键词为空，返回null
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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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// 构建模糊查询字符串
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searchString = String.format("%%%s%%", searchString);
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// 执行搜索查询
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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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@ -141,21 +200,33 @@ public class NotesProvider extends ContentProvider {
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 设置内容变更通知URI，当数据发生变化时通知观察者
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if (c != null) {
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c.setNotificationUri(getContext().getContentResolver(), uri);
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}
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return c;
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}
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/**
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* 插入便签数据
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* @param uri 请求的URI
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* @param values 要插入的数据
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* @return 插入数据的URI，包含新插入数据的ID
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* @throws IllegalArgumentException 当请求的URI无效时抛出
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*/
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@Override
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public Uri insert(Uri uri, ContentValues values) {
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// 获取可写数据库连接
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SQLiteDatabase db = mHelper.getWritableDatabase();
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long dataId = 0, noteId = 0, insertedId = 0;
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// 根据URI类型执行不同的插入逻辑
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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case URI_NOTE: // 插入便签或文件夹
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);
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break;
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case URI_DATA:
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case URI_DATA: // 插入便签数据
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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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@ -166,37 +237,49 @@ public class NotesProvider extends ContentProvider {
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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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// 通知便签URI数据变更
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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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// 通知数据URI数据变更
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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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// 返回包含新插入数据ID的URI
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return ContentUris.withAppendedId(uri, insertedId);
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}
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/**
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* 删除便签数据
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* @param uri 请求的URI
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* @param selection 删除条件
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* @param selectionArgs 删除条件参数
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* @return 删除的行数
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* @throws IllegalArgumentException 当请求的URI无效时抛出
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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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String id = null;
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// 获取可写数据库连接
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean deleteData = false;
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// 根据URI类型执行不同的删除逻辑
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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case URI_NOTE: // 删除便签或文件夹
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 排除系统文件夹
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count = db.delete(TABLE.NOTE, selection, selectionArgs);
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break;
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case URI_NOTE_ITEM:
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case URI_NOTE_ITEM: // 删除单个便签或文件夹
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id = uri.getPathSegments().get(1);
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/**
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* ID that smaller than 0 is system folder which is not allowed to
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|
|
|
|
* trash
|
|
|
|
|
* ID小于0的是系统文件夹，不允许删除
|
|
|
|
|
*/
|
|
|
|
|
long noteId = Long.valueOf(id);
|
|
|
|
|
if (noteId <= 0) {
|
|
|
|
|
@ -205,11 +288,11 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
count = db.delete(TABLE.NOTE,
|
|
|
|
|
NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
|
|
break;
|
|
|
|
|
case URI_DATA:
|
|
|
|
|
case URI_DATA: // 删除便签数据
|
|
|
|
|
count = db.delete(TABLE.DATA, selection, selectionArgs);
|
|
|
|
|
deleteData = true;
|
|
|
|
|
break;
|
|
|
|
|
case URI_DATA_ITEM:
|
|
|
|
|
case URI_DATA_ITEM: // 删除单个便签数据
|
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
|
count = db.delete(TABLE.DATA,
|
|
|
|
|
DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
|
|
@ -218,6 +301,8 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
default:
|
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 通知数据变更
|
|
|
|
|
if (count > 0) {
|
|
|
|
|
if (deleteData) {
|
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
|
|
@ -227,28 +312,40 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 更新便签数据
|
|
|
|
|
* @param uri 请求的URI
|
|
|
|
|
* @param values 要更新的数据
|
|
|
|
|
* @param selection 更新条件
|
|
|
|
|
* @param selectionArgs 更新条件参数
|
|
|
|
|
* @return 更新的行数
|
|
|
|
|
* @throws IllegalArgumentException 当请求的URI无效时抛出
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
|
|
|
|
|
int count = 0;
|
|
|
|
|
String id = null;
|
|
|
|
|
// 获取可写数据库连接
|
|
|
|
|
SQLiteDatabase db = mHelper.getWritableDatabase();
|
|
|
|
|
boolean updateData = false;
|
|
|
|
|
|
|
|
|
|
// 根据URI类型执行不同的更新逻辑
|
|
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
|
|
case URI_NOTE:
|
|
|
|
|
increaseNoteVersion(-1, selection, selectionArgs);
|
|
|
|
|
case URI_NOTE: // 更新便签或文件夹
|
|
|
|
|
increaseNoteVersion(-1, selection, selectionArgs); // 增加便签版本号
|
|
|
|
|
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
|
|
|
|
|
break;
|
|
|
|
|
case URI_NOTE_ITEM:
|
|
|
|
|
case URI_NOTE_ITEM: // 更新单个便签或文件夹
|
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
|
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
|
|
|
|
|
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 增加便签版本号
|
|
|
|
|
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
|
|
|
|
|
+ parseSelection(selection), selectionArgs);
|
|
|
|
|
break;
|
|
|
|
|
case URI_DATA:
|
|
|
|
|
case URI_DATA: // 更新便签数据
|
|
|
|
|
count = db.update(TABLE.DATA, values, selection, selectionArgs);
|
|
|
|
|
updateData = true;
|
|
|
|
|
break;
|
|
|
|
|
case URI_DATA_ITEM:
|
|
|
|
|
case URI_DATA_ITEM: // 更新单个便签数据
|
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
|
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
|
|
|
|
|
+ parseSelection(selection), selectionArgs);
|
|
|
|
|
@ -258,6 +355,7 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 通知数据变更
|
|
|
|
|
if (count > 0) {
|
|
|
|
|
if (updateData) {
|
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
|
|
@ -267,17 +365,28 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 解析选择条件，将额外的条件添加到现有条件中
|
|
|
|
|
* @param selection 原选择条件
|
|
|
|
|
* @return 解析后的选择条件
|
|
|
|
|
*/
|
|
|
|
|
private String parseSelection(String selection) {
|
|
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 增加便签版本号
|
|
|
|
|
* @param id 便签ID，如果为-1则更新所有符合条件的便签
|
|
|
|
|
* @param selection 更新条件
|
|
|
|
|
* @param selectionArgs 更新条件参数
|
|
|
|
|
*/
|
|
|
|
|
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
|
|
|
|
|
StringBuilder sql = new StringBuilder(120);
|
|
|
|
|
sql.append("UPDATE ");
|
|
|
|
|
sql.append(TABLE.NOTE);
|
|
|
|
|
sql.append(" SET ");
|
|
|
|
|
sql.append(NoteColumns.VERSION);
|
|
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 ");
|
|
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 "); // 版本号自增1
|
|
|
|
|
|
|
|
|
|
if (id > 0 || !TextUtils.isEmpty(selection)) {
|
|
|
|
|
sql.append(" WHERE ");
|
|
|
|
|
@ -293,9 +402,15 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
sql.append(selectString);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 执行SQL语句
|
|
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 获取URI对应的MIME类型
|
|
|
|
|
* @param uri 请求的URI
|
|
|
|
|
* @return MIME类型，目前未实现，返回null
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public String getType(Uri uri) {
|
|
|
|
|
// TODO Auto-generated method stub
|
|
|
|
|
|
