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package net.micode.notes.data;
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import android.app.SearchManager;
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import android.content.ContentProvider;
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import android.content.ContentUris;
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import android.content.ContentValues;
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import android.content.Intent;
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import android.content.UriMatcher;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.net.Uri;
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import android.text.TextUtils;
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import android.util.Log;
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import net.micode.notes.R;
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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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public class NotesProvider extends ContentProvider {
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// 定义 UriMatcher 以匹配不同的 URI
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private static final UriMatcher mMatcher;
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// 数据库帮助类的实例
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private NotesDatabaseHelper mHelper;
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private static final String TAG = "NotesProvider"; // 日志标签
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// 定义 URI 常量
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private static final int URI_NOTE = 1; // 笔记 URI
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private static final int URI_NOTE_ITEM = 2; // 单个笔记项 URI
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private static final int URI_DATA = 3; // 数据 URI
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private static final int URI_DATA_ITEM = 4; // 单个数据项 URI
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private static final int URI_SEARCH = 5; // 搜索 URI
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private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议 URI
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// 静态初始化块，初始化 UriMatcher
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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); // 匹配笔记 URI
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 匹配单个笔记项 URI
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 匹配数据 URI
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 匹配单个数据项 URI
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 匹配搜索 URI
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 匹配搜索建议 URI
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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 URI
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}
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/**
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* x'0A' 表示 SQLite 中的换行符 '\n'。对于搜索结果中的标题和内容，
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* 我们将修剪 '\n' 和空白，以显示更多信息。
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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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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
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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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// 用于搜索笔记的 SQL 查询语句
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private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
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+ " FROM " + TABLE.NOTE // 从笔记表中选择
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 根据摘要搜索
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+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除垃圾箱中的笔记
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 确保笔记类型是常规笔记
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@Override
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public boolean onCreate() {
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// 初始化数据库助手
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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return true; // 返回成功创建
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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; // 声明游标
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SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库
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String id = null; // 声明 ID 变量
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// 根据 URI 匹配执行不同的查询
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 查询所有笔记
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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: // 查询单个笔记项
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id = uri.getPathSegments().get(1); // 获取 URI 中的 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: // 查询所有数据
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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: // 查询单个数据项
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id = uri.getPathSegments().get(1); // 获取 URI 中的 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: // 搜索笔记
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case URI_SEARCH_SUGGEST: // 搜索建议
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// 不允许同时指定排序、选择、选择参数或投影
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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; // 声明搜索字符串
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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// 获取搜索建议中的搜索字符串
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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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// 获取查询参数中的模式
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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，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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// 格式化搜索字符串以用于 LIKE 查询
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searchString = String.format("%%%s%%", searchString);
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c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
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new String[] { searchString }); // 执行原始查询
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} catch (IllegalStateException ex) {
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Log.e(TAG, "got exception: " + ex.toString()); // 记录异常
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}
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri); // 未知 URI 异常
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}
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// 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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return c; // 返回结果游标
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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(); // 获取可写数据库
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long dataId = 0, noteId = 0, insertedId = 0; // 声明 ID 变量
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 插入新笔记
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);
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break;
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case URI_DATA: // 插入新数据
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if (values.containsKey(DataColumns.NOTE_ID)) { // 确保包含笔记 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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insertedId = dataId = db.insert(TABLE.DATA, null, values);
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri); // 未知 URI 异常
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}
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// 通知笔记 URI 更新
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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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// 通知数据 URI 更新
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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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return ContentUris.withAppendedId(uri, insertedId); // 返回插入的 URI
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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; // 记录受影响行数
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String id = null; // 声明 ID 字符串
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SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
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boolean deleteData = false; // 是否删除数据项标志
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 删除所有笔记
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 添加限制条件
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count = db.delete(TABLE.NOTE, selection, selectionArgs); // 执行删除操作
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break;
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case URI_NOTE_ITEM: // 删除单个笔记项
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id = uri.getPathSegments().get(1); // 获取 URI 中的 ID
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long noteId = Long.valueOf(id);
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if (noteId <= 0) { // 系统文件夹 ID 小于等于 0，不允许删除
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break;
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}
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count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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break;
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case URI_DATA: // 删除所有数据
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count = db.delete(TABLE.DATA, selection, selectionArgs); // 执行删除操作
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deleteData = true;
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break;
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case URI_DATA_ITEM: // 删除单个数据项
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id = uri.getPathSegments().get(1); // 获取 URI 中的 ID
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count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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deleteData = true;
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri); // 未知 URI 异常
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}
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if (count > 0) {
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if (deleteData) { // 如果删除了数据项，通知笔记 URI 更新
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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getContext().getContentResolver().notifyChange(uri, null); // 通知 URI 更新
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}
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return count; // 返回受影响行数
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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; // 记录受影响行数
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String id = null; // 声明 ID 字符串
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SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
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boolean updateData = false; // 是否更新数据项标志
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 更新所有笔记
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increaseNoteVersion(-1, selection, selectionArgs); // 增加笔记版本号
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count = db.update(TABLE.NOTE, values, selection, selectionArgs); // 执行更新操作
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break;
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case URI_NOTE_ITEM: // 更新单个笔记项
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id = uri.getPathSegments().get(1); // 获取 URI 中的 ID
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 根据 ID 增加笔记版本号
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count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs); // 执行更新操作
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break;
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case URI_DATA: // 更新所有数据
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count = db.update(TABLE.DATA, values, selection, selectionArgs); // 执行更新操作
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updateData = true;
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break;
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case URI_DATA_ITEM: // 更新单个数据项
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id = uri.getPathSegments().get(1); // 获取 URI 中的 ID
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count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs); // 执行更新操作
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updateData = true;
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri); // 未知 URI 异常
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}
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if (count > 0) {
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if (updateData) { // 如果更新了数据项，通知笔记 URI 更新
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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getContext().getContentResolver().notifyChange(uri, null); // 通知 URI 更新
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}
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return count; // 返回受影响行数
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}
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private String parseSelection(String selection) {
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); // 解析限制条件
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}
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private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
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StringBuilder sql = new StringBuilder(120); // 构建 SQL 语句
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sql.append("UPDATE "); // 更新操作
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sql.append(TABLE.NOTE); // 笔记表
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sql.append(" SET ");
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sql.append(NoteColumns.VERSION); // 增加版本号操作
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sql.append("=" + NoteColumns.VERSION + "+1 ");
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if (id > 0 || !TextUtils.isEmpty(selection)) { // 如果指定了 ID 或选择条件，添加限制条件
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sql.append(" WHERE ");
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}
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if (id > 0) {
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sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 添加 ID 等于指定值的限制
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}
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if (!TextUtils.isEmpty(selection)) {
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String selectString = id > 0 ? parseSelection(selection) : selection; // 解析限制条件
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for (String args : selectionArgs) {
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selectString = selectString.replaceFirst("\\?", args); // 替换参数中的占位符
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}
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sql.append(selectString); // 添加限制条件
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}
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mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行 SQL 语句
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}
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@Override
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public String getType(Uri uri) {
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return null; // 返回类型为 null
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}
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