From 6fc56872aa9a42a94bb7e5130926f68c65d44edc Mon Sep 17 00:00:00 2001 From: paq794u6l <2538776977@qq.com> Date: Thu, 18 Apr 2024 19:09:17 +0800 Subject: [PATCH] Delete 'src/data/NotesProvider.java' --- src/data/NotesProvider.java | 363 ------------------------------------ 1 file changed, 363 deletions(-) delete mode 100644 src/data/NotesProvider.java diff --git a/src/data/NotesProvider.java b/src/data/NotesProvider.java deleted file mode 100644 index cbbfa75..0000000 --- a/src/data/NotesProvider.java +++ /dev/null @@ -1,363 +0,0 @@ -/* - * 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; -//为存储和获取数据提供接口。可以在不同应用程序之间共享数据 -//ContentProvider提供的方法 -//query：查询 -//insert：插入 -//update：更新 -//delete：删除 -//getType：得到数据类型 - -public class NotesProvider extends ContentProvider {//包含了对数据的查询、插入、删除和更新操作 - //UriMatcher用于匹配Uri - private static final UriMatcher mMatcher; - - private NotesDatabaseHelper mHelper; - - private static final String TAG = "NotesProvider"; - - private static final int URI_NOTE = 1; - private static final int URI_NOTE_ITEM = 2; - private static final int URI_DATA = 3; - private static final int URI_DATA_ITEM = 4; - - private static final int URI_SEARCH = 5; - private static final int URI_SEARCH_SUGGEST = 6; - - static { - //创建UriMatcher时，调用UriMatcher（UriMatcher.NO_MATCH）表示不匹配任何路径的返回码 - mMatcher = new UriMatcher(UriMatcher.NO_MATCH); - //把需要匹配Uri路径全部给注册上 - 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); - } - - /** - * x'0A' represents the '\n' character in sqlite. For title and content in the search result, - * we will trim '\n' and white space in order to show more information. - */ - //声明NOTES_SEARCH_PROJECTION - 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; - - //声明NOTES_SNIPPET_SEARCH_QUERY - 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; - - @Override - //Context只有在onCreate()中才能被初始化 - //对mHelper进行实例化 - //通过调用getContext()获取当前的上下文， - // 用NotesDatabaseHelper.getInstance(getContext())方法获取一个数据库的帮助类的实例 - public boolean onCreate() { - //将得到的数据库帮助类实例赋值给成员变量mHelper，以便在后续的方法中使用 - mHelper = NotesDatabaseHelper.getInstance(getContext()); - return true; - } - - @Override - //查询Uri在数据库中对应的位置 - //query方法用于查询数据。 - //它接收一个Uri参数，这个Uri参数用于指定要查询的数据。通过查询数据库并返回一个Cursor对象，可以获取到相应的数据。 - public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { - Cursor c = null; - //获取可读数据库 - SQLiteDatabase db = mHelper.getReadableDatabase(); - String id = null; - //匹配查找Uri - switch (mMatcher.match(uri)) { - //对于不同的匹配值，在数据库中查找相应的条目 - case URI_NOTE: - c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, - sortOrder); - break; - case URI_NOTE_ITEM: - id = uri.getPathSegments().get(1); - c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id - + parseSelection(selection), selectionArgs, null, null, sortOrder); - break; - case URI_DATA: - c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, - sortOrder); - break; - case URI_DATA_ITEM: - 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: - if (sortOrder != null || projection != null) { - //不合法的参数异常 - throw new IllegalArgumentException( - "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); - } - - String searchString = null; - if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { - if (uri.getPathSegments().size() > 1) { - //getPathSegments()方法得到一个string的List - //在uri.getPathSegments().get(1)为第二个元素 - searchString = uri.getPathSegments().get(1); - } - } else { - searchString = uri.getQueryParameter("pattern"); - } - - if (TextUtils.isEmpty(searchString)) { - return null; - } - - try { - 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: - //抛出异常 - throw new IllegalArgumentException("Unknown URI " + uri); - } - if (c != null) { - c.setNotificationUri(getContext().getContentResolver(), uri); - } - return c; - } - - @Override - //insert()方法用于插入数据。 - //它接收一个uri参数，ContentValues参数。用于指定要插入的数据。 - //通过将数据插入到数据库中，并返回新插入数据的Uri，可以实现数据的插入操作。 - public Uri insert(Uri uri, ContentValues values) { - //获得可写的数据库 - SQLiteDatabase db = mHelper.getWritableDatabase(); - long dataId = 0, noteId = 0, insertedId = 0; - switch (mMatcher.match(uri)) { - //新增一个条目 - case URI_NOTE: - insertedId = noteId = db.insert(TABLE.NOTE, null, values); - break; - //如果存在，查找NOTE_ID - case URI_DATA: - if (values.containsKey(DataColumns.NOTE_ID)) { - noteId = values.getAsLong(DataColumns.NOTE_ID); - } else { - Log.d(TAG, "Wrong data format without note id:" + values.toString()); - } - insertedId = dataId = db.insert(TABLE.DATA, null, values); - break; - default: - throw new IllegalArgumentException("Unknown URI " + uri); - } - // Notify the note uri - if (noteId > 0) { - getContext().getContentResolver().notifyChange( - ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); - } - - // Notify the data uri - //notifyChange获得一个ContentResolver对象并且更新里面的内容 - if (dataId > 0) { - getContext().getContentResolver().notifyChange( - ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); - } - - //返回插入的uri的路径 - return ContentUris.withAppendedId(uri, insertedId); - } - - @Override - //删除一个uri - //delete()方法用于删除数据。 - //它接收一个uri参数，selection和selectionArgs参数， - //用于指定要删除的数据，通过在数据库中执行删除的操作，并返回受影响的行数，可以实现数据的删除操作 - public int delete(Uri uri, String selection, String[] selectionArgs) { - //Uri代表要操作的数据，Android上可用的每种资源 -包括 图像、视频片段、音频资源等都可以用Uri来表示。 - int count = 0; - String id = null; - //获得可写的数据库 - SQLiteDatabase db = mHelper.getWritableDatabase(); - boolean deleteData = false; - switch (mMatcher.match(uri)) { - case URI_NOTE: - selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; - count = db.delete(TABLE.NOTE, selection, selectionArgs); - break; - case URI_NOTE_ITEM: - id = uri.getPathSegments().get(1); - /** - * ID that smaller than 0 is system folder which is not allowed to - * trash - */ - long noteId = Long.valueOf(id); - if (noteId <= 0) { - break; - } - count = db.delete(TABLE.NOTE, - NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); - break; - case URI_DATA: - count = db.delete(TABLE.DATA, selection, selectionArgs); - deleteData = true; - break; - case URI_DATA_ITEM: - 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); - } - if (count > 0) { - if (deleteData) { - getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); - } - getContext().getContentResolver().notifyChange(uri, null); - } - return count; - } - - @Override - //更新一个Uri - //update()方法用于更新数据。 - //它接收一个Uri参数、一个ContentValues参数和一个可选的Selection和SelectionArgs参数 - //用于指定要更新的数据和更新条件。通过在数据库中执行更新操作，并返回受影响的行数，可以实现数据的更新操作。 - public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { - int count = 0; - String id = null; - SQLiteDatabase db = mHelper.getWritableDatabase(); - boolean updateData = false; - switch (mMatcher.match(uri)) { - case URI_NOTE: - increaseNoteVersion(-1, selection, selectionArgs); - count = db.update(TABLE.NOTE, values, selection, selectionArgs); - break; - case URI_NOTE_ITEM: - 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: - count = db.update(TABLE.DATA, values, selection, selectionArgs); - updateData = true; - break; - case URI_DATA_ITEM: - 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); - } - - if (count > 0) { - if (updateData) { - getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); - } - getContext().getContentResolver().notifyChange(uri, null); - } - return count; - } - - //将字符串解析成规定格式 - 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) { - //创建一个 StringBuilder 对象，用于构建 SQL 语句 - StringBuilder sql = new StringBuilder(120); - - // 添加 UPDATE 语句的起始部分 - sql.append("UPDATE "); - sql.append(TABLE.NOTE); - sql.append(" SET "); - - //设置版本号字段的新值为原值加一 - sql.append(NoteColumns.VERSION); - sql.append("=" + NoteColumns.VERSION + "+1 "); - - // 如果存在 id 或者 selection，添加 WHERE 子句 - if (id > 0 || !TextUtils.isEmpty(selection)) { - sql.append(" WHERE "); - } - // 如果存在 id，添加 id 条件 - if (id > 0) { - sql.append(NoteColumns.ID + "=" + String.valueOf(id)); - } - // 如果存在 selection，解析并添加到 WHERE 子句中 - 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，更新笔记版本号 - //execSQL()方法可以执行insert、delete、update和CREATE TABLE之类有更改行为的SQL语句 - mHelper.getWritableDatabase().execSQL(sql.toString()); - } - - //getType()方法用于获取数据的类型。 - //它接收一个Uri参数，根据Uri的不同返回相应的MIME类型。 - //MIME类型用于标识数据的类型，通常用于内容解析和数据传输。 - @Override - public String getType(Uri uri) { - // TODO Auto-generated method stub - return null; - } - -}