From cf9d040ecac063a544edd5dee4e4bddd0fd4ac3c Mon Sep 17 00:00:00 2001 From: pzlebpfvx <3035027729@qq.com> Date: Tue, 31 Dec 2024 10:27:27 +0800 Subject: [PATCH] ADD file via upload --- NotesProvider.java | 386 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 386 insertions(+) create mode 100644 NotesProvider.java diff --git a/NotesProvider.java b/NotesProvider.java new file mode 100644 index 0000000..8aae48c --- /dev/null +++ b/NotesProvider.java @@ -0,0 +1,386 @@ +/* + * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package net.micode.notes.data; + + +import android.app.SearchManager; +import android.content.ContentProvider; +import android.content.ContentUris; +import android.content.ContentValues; +import android.content.Intent; +import android.content.UriMatcher; +import android.database.Cursor; +import android.database.sqlite.SQLiteDatabase; +import android.net.Uri; +import android.text.TextUtils; +import android.util.Log; + +import net.micode.notes.R; +import net.micode.notes.data.Notes.DataColumns; +import net.micode.notes.data.Notes.NoteColumns; +import net.micode.notes.data.NotesDatabaseHelper.TABLE; + +/** + * 笔记内容提供者类,用于管理笔记数据的访问 + */ +public class NotesProvider extends ContentProvider { + // URI匹配器 + private static final UriMatcher mMatcher; + + // 数据库帮助类实例 + private NotesDatabaseHelper mHelper; + + // 日志标签 + private static final String TAG = "NotesProvider"; + + // URI匹配类型常量 + private static final int URI_NOTE = 1; // 笔记URI + private static final int URI_NOTE_ITEM = 2; // 单条笔记URI + private static final int URI_DATA = 3; // 数据URI + private static final int URI_DATA_ITEM = 4; // 单条数据URI + private static final int URI_SEARCH = 5; // 搜索URI + private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI + + // 静态初始化URI匹配规则 + static { + // 创建URI匹配器实例 + mMatcher = new UriMatcher(UriMatcher.NO_MATCH); + // 添加各种URI匹配规则 + mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); + mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); + mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); + mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); + mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); + mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); + mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); + } + + /** + * 搜索结果的投影列 + * x'0A'表示sqlite中的换行符'\n' + * 为了在搜索结果中显示更多信息,我们会去除标题和内容中的换行符和空格 + */ + private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," + + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," + + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," + + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," + + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," + + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," + + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; + + /** + * 笔记搜索的SQL查询语句 + */ + private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION + + " FROM " + TABLE.NOTE + + " WHERE " + NoteColumns.SNIPPET + " LIKE ?" + + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; + + /** + * 内容提供者创建时的回调方法 + */ + @Override + public boolean onCreate() { + // 初始化数据库帮助类 + mHelper = NotesDatabaseHelper.getInstance(getContext()); + return true; + } + + /** + * 查询数据的方法 + */ + @Override + public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, + String sortOrder) { + // 初始化游标 + Cursor c = null; + // 获取可读数据库实例 + SQLiteDatabase db = mHelper.getReadableDatabase(); + String id = null; + // 根据URI类型执行不同的查询操作 + switch (mMatcher.match(uri)) { + case URI_NOTE: + // 查询所有笔记 + c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, + sortOrder); + break; + case URI_NOTE_ITEM: + // 查询单条笔记 + id = uri.getPathSegments().get(1); + c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + + parseSelection(selection), selectionArgs, null, null, sortOrder); + break; + case URI_DATA: + // 查询所有数据 + c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, + sortOrder); + break; + case URI_DATA_ITEM: + // 查询单条数据 + id = uri.getPathSegments().get(1); + c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + + parseSelection(selection), selectionArgs, null, null, sortOrder); + break; + case URI_SEARCH: + case URI_SEARCH_SUGGEST: + // 检查查询参数 + if (sortOrder != null || projection != null) { + throw new IllegalArgumentException( + "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); + } + + // 获取搜索字符串 + String searchString = null; + if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { + if (uri.getPathSegments().size() > 1) { + searchString = uri.getPathSegments().get(1); + } + } else { + searchString = uri.getQueryParameter("pattern"); + } + + // 如果搜索字符串为空则返回null + if (TextUtils.isEmpty(searchString)) { + return null; + } + + try { + // 格式化搜索字符串并执行查询 + searchString = String.format("%%%s%%", searchString); + c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, + new String[] { searchString }); + } catch (IllegalStateException ex) { + Log.e(TAG, "got exception: " + ex.toString()); + } + break; + default: + throw new IllegalArgumentException("Unknown URI " + uri); + } + // 设置通知URI + if (c != null) { + c.setNotificationUri(getContext().getContentResolver(), uri); + } + return c; + } + + /** + * 插入数据的方法 + */ + /** + * 插入数据到数据库中 + * @param uri 要插入数据的URI + * @param values 要插入的数据 + * @return 插入数据后生成的URI + */ + @Override + public Uri insert(Uri uri, ContentValues values) { + // 获取可写数据库实例 + SQLiteDatabase db = mHelper.getWritableDatabase(); + // 初始化数据ID、笔记ID和插入ID + long dataId = 0, noteId = 0, insertedId = 0; + switch (mMatcher.match(uri)) { + case URI_NOTE: + // 插入笔记数据 + insertedId = noteId = db.insert(TABLE.NOTE, null, values); + break; + case URI_DATA: + // 插入笔记内容数据 + if (values.containsKey(DataColumns.NOTE_ID)) { + // 从values中获取笔记ID + noteId = values.getAsLong(DataColumns.NOTE_ID); + } else { + // 记录错误日志:缺少笔记ID + Log.d(TAG, "Wrong data format without note id:" + values.toString()); + } + // 插入数据并获取插入ID + insertedId = dataId = db.insert(TABLE.DATA, null, values); + break; + default: + // 未知URI异常 + throw new IllegalArgumentException("Unknown URI " + uri); + } + // 通知笔记URI发生变化 + if (noteId > 0) { + getContext().getContentResolver().notifyChange( + ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); + } + + // 通知数据URI发生变化 + if (dataId > 0) { + getContext().getContentResolver().notifyChange( + ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); + } + + return ContentUris.withAppendedId(uri, insertedId); + } + + /** + * 删除数据的方法 + */ + @Override + public int delete(Uri uri, String selection, String[] selectionArgs) { + // 初始化删除计数 + int count = 0; + String id = null; + // 获取可写数据库实例 + SQLiteDatabase db = mHelper.getWritableDatabase(); + boolean deleteData = false; + // 根据URI类型执行不同的删除操作 + switch (mMatcher.match(uri)) { + case URI_NOTE: + // 删除笔记,确保只删除ID大于0的笔记 + selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; + count = db.delete(TABLE.NOTE, selection, selectionArgs); + break; + case URI_NOTE_ITEM: + // 删除单条笔记 + id = uri.getPathSegments().get(1); + /** + * ID小于0的是系统文件夹,不允许删除 + */ + long noteId = Long.valueOf(id); + if (noteId <= 0) { + break; + } + count = db.delete(TABLE.NOTE, + NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); + break; + case URI_DATA: + // 删除所有数据 + count = db.delete(TABLE.DATA, selection, selectionArgs); + deleteData = true; + break; + case URI_DATA_ITEM: + // 删除单条数据 + id = uri.getPathSegments().get(1); + count = db.delete(TABLE.DATA, + DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); + deleteData = true; + break; + default: + throw new IllegalArgumentException("Unknown URI " + uri); + } + // 如果有数据被删除,发送通知 + if (count > 0) { + if (deleteData) { + getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); + } + getContext().getContentResolver().notifyChange(uri, null); + } + return count; + } + + /** + * 更新数据的方法 + */ + @Override + public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { + // 初始化更新计数 + int count = 0; + String id = null; + // 获取可写数据库实例 + SQLiteDatabase db = mHelper.getWritableDatabase(); + boolean updateData = false; + // 根据URI类型执行不同的更新操作 + switch (mMatcher.match(uri)) { + case URI_NOTE: + // 更新笔记 + increaseNoteVersion(-1, selection, selectionArgs); + count = db.update(TABLE.NOTE, values, selection, selectionArgs); + break; + case URI_NOTE_ITEM: + // 更新单条笔记 + id = uri.getPathSegments().get(1); + increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); + count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + + parseSelection(selection), selectionArgs); + break; + case URI_DATA: + // 更新所有数据 + count = db.update(TABLE.DATA, values, selection, selectionArgs); + updateData = true; + break; + case URI_DATA_ITEM: + // 更新单条数据 + id = uri.getPathSegments().get(1); + count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + + parseSelection(selection), selectionArgs); + updateData = true; + break; + default: + throw new IllegalArgumentException("Unknown URI " + uri); + } + + // 如果有数据被更新,发送通知 + if (count > 0) { + if (updateData) { + getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); + } + getContext().getContentResolver().notifyChange(uri, null); + } + return count; + } + + /** + * 解析选择条件的辅助方法 + */ + private String parseSelection(String selection) { + return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); + } + + /** + * 增加笔记版本号的方法 + */ + private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { + // 构建SQL更新语句 + StringBuilder sql = new StringBuilder(120); + sql.append("UPDATE "); + sql.append(TABLE.NOTE); + sql.append(" SET "); + sql.append(NoteColumns.VERSION); + sql.append("=" + NoteColumns.VERSION + "+1 "); + + // 添加WHERE子句 + if (id > 0 || !TextUtils.isEmpty(selection)) { + sql.append(" WHERE "); + } + if (id > 0) { + sql.append(NoteColumns.ID + "=" + String.valueOf(id)); + } + if (!TextUtils.isEmpty(selection)) { + String selectString = id > 0 ? parseSelection(selection) : selection; + for (String args : selectionArgs) { + selectString = selectString.replaceFirst("\\?", args); + } + sql.append(selectString); + } + + // 执行SQL语句 + mHelper.getWritableDatabase().execSQL(sql.toString()); + } + + /** + * 获取MIME类型的方法 + */ + @Override + public String getType(Uri uri) { + // TODO Auto-generated method stub + return null; + } + +}