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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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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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* 笔记内容提供者,用于提供笔记数据
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*/
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public class NotesProvider extends ContentProvider {
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// 用于匹配Uri的UriMatcher
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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匹配码常量
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private static final int URI_NOTE = 1;// 匹配笔记列表
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private static final int URI_NOTE_ITEM = 2;; // 匹配单个笔记
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private static final int URI_DATA = 3;// 匹配数据列表
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private static final int URI_DATA_ITEM = 4;// 匹配单个数据项
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private static final int URI_SEARCH = 5; // 匹配搜索结果
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private static final int URI_SEARCH_SUGGEST = 6;// 匹配搜索建议
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static { // 初始化UriMatcher,用于匹配Uri
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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// 添加Uri匹配规则
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);// 匹配笔记列表
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);// 匹配单个笔记
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);// 匹配数据列表
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);// 匹配单个数据项
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);// 匹配搜索结果
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);// 匹配搜索建议
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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
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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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*/
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/**
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* NOTES_SEARCH_PROJECTION 定义了搜索结果中显示的列。
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* x'0A' 在sqlite中表示 '\n' 字符。为了在搜索结果中显示更多信息,
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* 我们将标题和内容中的 '\n' 和空白字符进行修剪。
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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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/**
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* NOTES_SNIPPET_SEARCH_QUERY 定义了搜索笔记片段的查询语句。
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* 该查询从笔记表中选取符合条件的记录,并排除垃圾文件夹中的笔记。
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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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// 当ContentProvider被创建时调用
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@Override
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public boolean onCreate() {
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// 获取NotesDatabaseHelper的单例实例
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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// 返回true表示ContentProvider初始化成功
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return true;
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}
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// 重写query方法以响应ContentProvider的查询请求
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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;// 初始化Cursor对象
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SQLiteDatabase db = mHelper.getReadableDatabase();// 获取可读数据库实例
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String id = null; // 初始化id变量
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// 根据Uri匹配结果执行不同的查询操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:// 匹配笔记列表
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
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sortOrder);// 执行查询操作
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break;
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case URI_NOTE_ITEM:// 匹配单个笔记
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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); // 执行查询操作
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break;
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case URI_DATA:// 匹配数据列表
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
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sortOrder);// 执行查询操作
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break;
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case URI_DATA_ITEM:// 匹配单个数据项
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id = uri.getPathSegments().get(1); // 从Uri中获取数据项ID
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c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);// 执行查询操作
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break;
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case URI_SEARCH:// 匹配搜索
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case URI_SEARCH_SUGGEST:// 匹配搜索建议
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// 如果提供了排序顺序或投影,则抛出异常
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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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// 初始化搜索字符串
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String searchString = null;
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// 如果Uri匹配搜索建议
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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// 如果Uri的路径段数量大于1,则获取搜索字符串
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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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// 否则从Uri的查询参数中获取搜索字符串
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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,则返回null
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if (TextUtils.isEmpty(searchString)) {
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return null;
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}
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// 尝试执行搜索查询
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try {
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// 格式化搜索字符串以进行模糊匹配
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searchString = String.format("%%%s%%", searchString);
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// 执行原始查询,获取匹配的笔记片段
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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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// 如果发生异常,记录错误日志
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Log.e(TAG, "got exception: " + ex.toString());
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}// 结束switch语句的当前分支
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break;
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// 如果Uri不匹配已知情况,则抛出异常
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}// 如果Cursor不为空,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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}// 返回Cursor
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return c;
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}
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// 重写insert方法以响应ContentProvider的插入请求
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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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// 获取可写数据库实例
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long dataId = 0, noteId = 0, insertedId = 0; // 初始化ID变量
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// 根据Uri匹配结果执行不同的插入操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 匹配笔记插入
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);// 插入笔记并获取ID
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break;
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case URI_DATA:// 匹配数据插入
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// 检查ContentValues中是否包含笔记ID
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if (values.containsKey(DataColumns.NOTE_ID)) {// 获取笔记ID
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noteId = values.getAsLong(DataColumns.NOTE_ID);
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} else {
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// 如果没有笔记ID,记录调试信息
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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);// 插入数据并获取ID
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);// 如果Uri不匹配已知情况,则抛出异常
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}
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// Notify the note uri
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// 如果插入的是笔记,则通知内容解析器变更
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if (noteId > 0) {
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// 使用ContentUris.withAppendedId构建具体的笔记Uri,并通知变更
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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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// Notify the data uri
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// 如果插入的是数据,则通知内容解析器变更
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if (dataId > 0) {
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// 使用ContentUris.withAppendedId构建具体的数据Uri,并通知变更
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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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// 返回插入操作后带ID的Uri
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return ContentUris.withAppendedId(uri, insertedId);
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}
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// 重写delete方法以响应ContentProvider的删除请求
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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;// 初始化删除计数器
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String id = null; // 初始化ID变量
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SQLiteDatabase db = mHelper.getWritableDatabase();// 获取可写数据库实例
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boolean deleteData = false; // 初始化是否删除数据的标志
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// 根据Uri匹配结果执行不同的删除操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:// 匹配笔记删除
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// 添加条件确保只删除ID大于0的笔记
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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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:// 匹配特定笔记项删除
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id = uri.getPathSegments().get(1); // 获取笔记ID
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// ID小于等于0的是系统文件夹,不允许删除到垃圾桶
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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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if (noteId <= 0) {
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break;// 如果是系统文件夹,则跳出
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}
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count = db.delete(TABLE.NOTE,// 执行删除操作
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NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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break;
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case URI_DATA:// 匹配数据删除
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count = db.delete(TABLE.DATA, selection, selectionArgs);// 执行删除操作
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deleteData = true;// 设置删除数据标志
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break;
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case URI_DATA_ITEM:// 匹配特定数据项删除
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id = uri.getPathSegments().get(1);// 获取数据ID
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count = db.delete(TABLE.DATA,// 执行删除操作
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DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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deleteData = true;// 设置删除数据标志
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri); // 如果Uri不匹配已知情况,则抛出异常
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} // 如果删除了记录,则通知内容解析器变更
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if (count > 0) {
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// 如果删除的是数据,则通知笔记Uri变更
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if (deleteData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}// 通知原始Uri变更
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getContext().getContentResolver().notifyChange(uri, null);
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}// 返回删除的记录数
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return count;
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}
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// 重写update方法以响应ContentProvider的更新请求
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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;// 初始化更新计数器
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String id = null;// 初始化ID变量
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SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库实例
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boolean updateData = false;// 初始化是否更新数据的标志
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// 根据Uri匹配结果执行不同的更新操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:// 匹配笔记更新
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increaseNoteVersion(-1, selection, selectionArgs); // 更新笔记版本
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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:// 匹配特定笔记项更新
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id = uri.getPathSegments().get(1); // 获取笔记ID
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);// 更新笔记版本
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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:// 匹配数据更新
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count = db.update(TABLE.DATA, values, selection, selectionArgs); // 执行更新操作
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updateData = true;// 设置更新数据标志
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break;
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case URI_DATA_ITEM:// 匹配特定数据项更新
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id = uri.getPathSegments().get(1);// 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); // 执行更新操作
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updateData = true;// 设置更新数据标志
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);// 如果Uri不匹配已知情况,则抛出异常
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}
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// 如果更新了记录,则通知内容解析器变更
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if (count > 0) {
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// 如果更新的是数据,则通知笔记Uri变更
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if (updateData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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} // 通知原始Uri变更
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getContext().getContentResolver().notifyChange(uri, null);
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} // 返回更新的记录数
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return count;
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}
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// 私有方法,用于解析选择条件
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private String parseSelection(String selection) {
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// 如果选择条件不为空,则添加AND连接符,否则返回空字符串
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
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}
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// 私有方法,用于增加笔记的版本号
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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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// 创建StringBuilder对象用于构建SQL语句
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sql.append("UPDATE "); // 添加更新SQL语句的开始部分
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sql.append(TABLE.NOTE);// 指定更新的表
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sql.append(" SET ");// 添加设置字段的开始部分
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sql.append(NoteColumns.VERSION);// 指定要更新的版本字段
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sql.append("=" + NoteColumns.VERSION + "+1 "); // 将版本号加1
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// 如果提供了特定的ID或者有选择条件,则添加WHERE子句
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if (id > 0 || !TextUtils.isEmpty(selection)) {
|
|
|
sql.append(" WHERE ");
|
|
|
}
|
|
|
if (id > 0) {
|
|
|
// 如果提供了特定的ID,则将其作为更新条件
|
|
|
sql.append(NoteColumns.ID + "=" + String.valueOf(id));
|
|
|
}
|
|
|
if (!TextUtils.isEmpty(selection)) {
|
|
|
// 如果有选择条件,则处理选择条件和参数
|
|
|
String selectString = id > 0 ? parseSelection(selection) : selection;
|
|
|
// 替换选择条件中的占位符为实际的参数值
|
|
|
for (String args : selectionArgs) {
|
|
|
selectString = selectString.replaceFirst("\\?", args);
|
|
|
}
|
|
|
sql.append(selectString);
|
|
|
}
|
|
|
|
|
|
// 执行构建的SQL语句以更新笔记版本
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
}
|
|
|
// 重写getType方法以响应ContentProvider的getType请求
|
|
|
@Override
|
|
|
public String getType(Uri uri) {
|
|
|
// TODO Auto-generated method stub
|
|
|
// TODO: 根据Uri返回相应的MIME类型,此处需要实现具体的逻辑
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
}
|