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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.data;
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// 导入需要的Android和本地类
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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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/**
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* NotesProvider 类继承自 ContentProvider，
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* 负责与外部交互以进行笔记数据的增删改查操作。
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*/
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public class NotesProvider extends ContentProvider {
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// UriMatcher，用于匹配不同的URI请求
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private static final UriMatcher mMatcher;
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// 数据库助手实例
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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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// 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 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 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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// 静态代码块，初始化 URI 匹配器并添加各种 URI 匹配规则
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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); // 笔记的 URI
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 单个笔记的 URI
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 数据的 URI
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 单个数据的 URI
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 搜索 URI
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 搜索建议 URI
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 带参数的搜索建议 URI
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}
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/**
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* 在搜索结果中，x'0A' 代表换行符。为了更好地展示信息，
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* 我们将搜索结果中的标题和内容进行修剪以去除换行符和空格。
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*/
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private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," // 笔记 ID
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+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," // 笔记 ID 作为意图额外数据
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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," // 修剪后的内容作为建议文本1
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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 修剪后的内容作为建议文本2
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+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," // 搜索结果图标
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+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," // 意图行为
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+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 笔记内容类型
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// 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 // 查询的表为笔记表
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 根据内容片段进行模糊匹配
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+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除回收站的内容
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 仅匹配笔记类型
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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; // 创建成功
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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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// 查询方法，处理不同的URI请求并返回结果的Cursor
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Cursor c = null;
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SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库
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String id = null; // 用于存储ID
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switch (mMatcher.match(uri)) { // 根据URI匹配不同的查询类型
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case URI_NOTE:
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// 查询所有笔记
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
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break;
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case URI_NOTE_ITEM:
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// 查询单个笔记
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id = uri.getPathSegments().get(1); // 从URI中获取笔记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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// 查询所有数据
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
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break;
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case URI_DATA_ITEM:
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// 查询单个数据
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id = uri.getPathSegments().get(1); // 从URI中获取数据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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if (sortOrder != null || projection != null) {
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// 搜索请求不支持排序或选择
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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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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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// 获取搜索建议的参数
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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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// 从查询参数获取搜索字符串
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searchString = uri.getQueryParameter("pattern");
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}
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if (TextUtils.isEmpty(searchString)) {
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return null; // 如果搜索字符串为空，则返回null
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}
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try {
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// 使用通配符模糊匹配
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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 }); // 执行搜索查询
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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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// 未知的URI，抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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if (c != null) {
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// 设置通知URI，数据变化时通知的URI
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c.setNotificationUri(getContext().getContentResolver(), uri);
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}
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return c; // 返回查询结果
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}
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@Override
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public Uri insert(Uri uri, ContentValues values) {
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// 插入数据方法
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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; // 初始化ID
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switch (mMatcher.match(uri)) { // 根据URI匹配不同的插入类型
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case URI_NOTE:
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// 插入新的笔记
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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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// 插入新的数据
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if (values.containsKey(DataColumns.NOTE_ID)) {
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// 获取关联的笔记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()); // 记录错误日志
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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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// 未知的URI，抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 当笔记插入成功时，通知笔记URI
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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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// 当数据插入成功时，通知数据URI
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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); // 返回新插入项的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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// 删除数据方法
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int count = 0; // 计数删除的行数
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String id = null; // 用于存储ID
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SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
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boolean deleteData = false; // 标记是否删除数据
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switch (mMatcher.match(uri)) { // 根据URI匹配不同的删除类型
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case URI_NOTE:
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// 删除所有笔记
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 除去系统文件夹
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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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// 删除单个笔记
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id = uri.getPathSegments().get(1); // 从URI中获取笔记ID
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long noteId = Long.valueOf(id);
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if (noteId <= 0) {
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break; // 系统文件夹不允许删除
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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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// 删除所有数据
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count = db.delete(TABLE.DATA, selection, selectionArgs);
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deleteData = true; // 标记为删除数据
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break;
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case URI_DATA_ITEM:
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// 删除单个数据
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id = uri.getPathSegments().get(1); // 从URI中获取数据ID
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count = db.delete(TABLE.DATA,
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DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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deleteData = true; // 标记为删除数据
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break;
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default:
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// 未知的URI，抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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if (count > 0) {
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if (deleteData) {
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// 如果删除了数据，通知笔记URI
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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// 通知数据URI
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getContext().getContentResolver().notifyChange(uri, null);
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}
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return count; // 返回删除的行数
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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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// 更新数据方法
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int count = 0; // 计数更新的行数
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String id = null; // 用于存储ID
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SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库
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boolean updateData = false; // 标记是否更新数据
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switch (mMatcher.match(uri)) { // 根据URI匹配不同的更新类型
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case URI_NOTE:
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// 更新所有笔记
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increaseNoteVersion(-1, selection, selectionArgs); // 更新版本
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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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// 更新单个笔记
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id = uri.getPathSegments().get(1); // 从URI中获取笔记ID
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 更新版本
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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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// 更新所有数据
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count = db.update(TABLE.DATA, values, selection, selectionArgs);
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updateData = true; // 标记为更新数据
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break;
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case URI_DATA_ITEM:
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// 更新单个数据
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id = uri.getPathSegments().get(1); // 从URI中获取数据ID
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count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs);
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updateData = true; // 标记为更新数据
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break;
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default:
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// 未知的URI，抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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if (count > 0) {
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if (updateData) {
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// 如果更新了数据，通知笔记URI
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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// 通知数据URI
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getContext().getContentResolver().notifyChange(uri, null);
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}
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return count; // 返回更新的行数
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}
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// 辅助方法，用于解析选择条件
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private String parseSelection(String selection) {
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); // 如果选择条件不为空则添加 AND
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}
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// 辅助方法，用于增加笔记版本
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private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
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StringBuilder sql = new StringBuilder(120);
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sql.append("UPDATE ");
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sql.append(TABLE.NOTE);
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sql.append(" SET ");
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sql.append(NoteColumns.VERSION);
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sql.append("=" + NoteColumns.VERSION + "+1 "); // 增加版本号
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if (id > 0 || !TextUtils.isEmpty(selection)) {
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sql.append(" WHERE "); // 如果有ID或选择条件，添加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条件
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}
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if (!TextUtils.isEmpty(selection)) {
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// 处理选择参数
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String selectString = id > 0 ? parseSelection(selection) : selection;
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for (String args : selectionArgs) {
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selectString = selectString.replaceFirst("\\?", args); // 替换占位符
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}
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sql.append(selectString);
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}
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mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL更新版本号
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}
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@Override
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public String getType(Uri uri) {
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// 返回特定URI的MIME类型，这里暂时不实现
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return null;
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}
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}
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