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@ -34,33 +34,48 @@ import net.micode.notes.data.Notes.DataColumns;
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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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* 笔记应用的内容提供者实现
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* 功能：
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* 1. 提供对笔记数据的CRUD操作
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* 2. 支持全局搜索和搜索建议
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* 3. 管理数据变更通知
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*/
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public class NotesProvider extends ContentProvider {
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// URI匹配器，用于解析不同类型的URI请求
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private static final UriMatcher mMatcher;
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// 数据库帮助类实例
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private NotesDatabaseHelper mHelper;
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// 日志标签
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private static final String TAG = "NotesProvider";
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// URI匹配类型常量
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private static final int URI_NOTE = 1;// 笔记集合操作
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private static final int URI_NOTE_ITEM = 2;// 单条笔记操作
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private static final int URI_DATA = 3;// 笔记数据集合操作
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private static final int URI_DATA_ITEM = 4;// 单条笔记数据操作
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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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private static final int URI_SEARCH = 5;// 搜索请求
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private static final int URI_SEARCH_SUGGEST = 6;// 搜索建议请求
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// 静态初始化块，配置URI匹配规则
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static {
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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// 笔记表操作URI
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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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// 数据表操作URI
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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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// 搜索相关URI
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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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}
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/**
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* 搜索结果的投影(列)定义：
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* - 替换换行符为空格以便显示
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* - 配置搜索建议所需的各列数据
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* - 包含跳转所需的Intent信息
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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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@ -72,52 +87,71 @@ public class NotesProvider extends ContentProvider {
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+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
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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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* 笔记搜索查询SQL：
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* - 从笔记表查询
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* - 按内容片段匹配
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* - 排除回收站中的笔记
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* - 只查询普通笔记类型
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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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/**
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* 内容提供者初始化
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* @return 是否初始化成功
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*/
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@Override
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public boolean onCreate() {
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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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* 查询方法
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* @param uri 请求的URI
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* @param projection 要返回的列
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* @param selection 筛选条件
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* @param selectionArgs 筛选参数
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* @param sortOrder 排序方式
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* @return 查询结果的Cursor
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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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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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// 根据URI类型执行不同查询
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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case URI_NOTE:// 查询笔记表
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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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case URI_NOTE_ITEM:// 查询单条笔记
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id = uri.getPathSegments().get(1);
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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:// 查询数据表
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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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case URI_DATA_ITEM:// 查询单条数据
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id = uri.getPathSegments().get(1);
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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:// 处理搜索请求
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case URI_SEARCH_SUGGEST:// 处理搜索建议请求
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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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String searchString = null;
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// 从URI获取搜索关键词
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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if (uri.getPathSegments().size() > 1) {
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searchString = uri.getPathSegments().get(1);
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@ -131,7 +165,9 @@ public class NotesProvider extends ContentProvider {
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}
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try {
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// 构造模糊查询参数
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searchString = String.format("%%%s%%", searchString);
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// 执行原始SQL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 +177,28 @@ 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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// 设置内容监听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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return c;
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}
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/**
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* 插入数据
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* @param uri 内容URI
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* @param values 要插入的值
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* @return 新插入数据的URI
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*/
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@Override
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public Uri insert(Uri uri, ContentValues values) {
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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类型执行不同插入操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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case URI_NOTE:// 插入笔记
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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:// 插入笔记数据
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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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@ -166,7 +209,7 @@ 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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// Notify the note uri 发送数据变更通知
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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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@ -177,39 +220,47 @@ public class NotesProvider extends ContentProvider {
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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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// 返回新插入数据的URI
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return ContentUris.withAppendedId(uri, insertedId);
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}
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/**
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* 删除数据
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* @param uri 内容URI
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* @param selection 筛选条件
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* @param selectionArgs 筛选参数
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* @return 删除的记录数
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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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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean deleteData = false;
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// 根据URI类型执行不同删除操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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case URI_NOTE:// 删除笔记(排除系统文件夹)
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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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: // 删除单条笔记
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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
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*/
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long noteId = Long.valueOf(id);
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// 系统文件夹不允许删除
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if (noteId <= 0) {
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break;
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}
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count = db.delete(TABLE.NOTE,
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NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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break;
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case URI_DATA:
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case URI_DATA:// 删除笔记数据
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count = db.delete(TABLE.DATA, selection, selectionArgs);
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deleteData = true;
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break;
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case URI_DATA_ITEM:
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case URI_DATA_ITEM: // 删除单条笔记数据
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id = uri.getPathSegments().get(1);
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count = db.delete(TABLE.DATA,
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DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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@ -218,6 +269,7 @@ 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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// 发送数据变更通知
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if (count > 0) {
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if (deleteData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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@ -226,29 +278,37 @@ public class NotesProvider extends ContentProvider {
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}
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return count;
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}
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/**
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* 更新数据
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* @param uri 内容URI
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* @param values 要更新的值
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* @param selection 筛选条件
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* @param selectionArgs 筛选参数
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* @return 更新的记录数
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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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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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// 根据URI类型执行不同更新操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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case URI_NOTE:// 更新笔记
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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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case URI_NOTE_ITEM: // 更新单条笔记
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id = uri.getPathSegments().get(1);
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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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case URI_DATA:// 更新笔记数据
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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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case URI_DATA_ITEM:// 更新单条笔记数据
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id = uri.getPathSegments().get(1);
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count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs);
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@ -257,7 +317,7 @@ public class NotesProvider extends ContentProvider {
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|
|
default:
|
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 发送数据变更通知
|
|
|
|
|
if (count > 0) {
|
|
|
|
|
if (updateData) {
|
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
|
|
@ -266,11 +326,20 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
}
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 解析selection条件，添加AND连接
|
|
|
|
|
* @param selection 原始条件
|
|
|
|
|
* @return 处理后的条件
|
|
|
|
|
*/
|
|
|
|
|
private String parseSelection(String selection) {
|
|
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 增加笔记版本号
|
|
|
|
|
* @param id 笔记ID
|
|
|
|
|
* @param selection 筛选条件
|
|
|
|
|
* @param selectionArgs 筛选参数
|
|
|
|
|
*/
|
|
|
|
|
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
|
|
|
|
|
StringBuilder sql = new StringBuilder(120);
|
|
|
|
|
sql.append("UPDATE ");
|
|
|
|
|
@ -278,7 +347,7 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
sql.append(" SET ");
|
|
|
|
|
sql.append(NoteColumns.VERSION);
|
|
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 ");
|
|
|
|
|
|
|
|
|
|
// 添加条件
|
|
|
|
|
if (id > 0 || !TextUtils.isEmpty(selection)) {
|
|
|
|
|
sql.append(" WHERE ");
|
|
|
|
|
}
|
|
|
|
|
@ -287,18 +356,23 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
}
|
|
|
|
|
if (!TextUtils.isEmpty(selection)) {
|
|
|
|
|
String selectString = id > 0 ? parseSelection(selection) : selection;
|
|
|
|
|
// 替换参数占位符
|
|
|
|
|
for (String args : selectionArgs) {
|
|
|
|
|
selectString = selectString.replaceFirst("\\?", args);
|
|
|
|
|
}
|
|
|
|
|
sql.append(selectString);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 执行版本号更新
|
|
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 获取URI对应的MIME类型
|
|
|
|
|
* @param uri 内容URI
|
|
|
|
|
* @return MIME类型字符串
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public String getType(Uri uri) {
|
|
|
|
|
// TODO Auto-generated method stub
|
|
|
|
|
// TODO Auto-generated method stub当前实现中未使用，返回null
|
|
|
|
|
return null;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
