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@ -0,0 +1,354 @@
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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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* NotesProvider是内容提供者类，负责提供与笔记数据的增删改查功能。
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* 它通过SQLite数据库进行数据存储，并使用UriMatcher来解析URI请求。
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*/
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public class NotesProvider extends ContentProvider {
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// 定义UriMatcher对象，用于匹配不同类型的URI
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private static final UriMatcher mMatcher;
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// Notes数据库帮助类，用于操作数据库
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private NotesDatabaseHelper mHelper;
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// 日志TAG
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private static final String TAG = "NotesProvider";
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// 定义不同的URI匹配码
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private static final int URI_NOTE = 1; // 匹配所有笔记
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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; // 匹配所有数据
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private static final int URI_DATA_ITEM = 4; // 匹配单个数据
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private static final int URI_SEARCH = 5; // 匹配搜索请求
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private static final int URI_SEARCH_SUGGEST = 6; // 匹配搜索建议请求
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// 静态代码块，用于初始化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); // 匹配具体的笔记
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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); // 匹配具体的数据
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 匹配搜索
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 搜索建议
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
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}
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/**
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* SQL查询片段，用于从笔记中搜索，删除换行符并裁剪空格，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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// SQL查询，用于搜索笔记内容中的摘要
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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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/**
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* 创建ContentProvider实例时调用。
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* 主要用于初始化数据库帮助类实例。
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*/
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@Override
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public boolean onCreate() {
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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return true;
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}
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/**
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* 处理查询请求。
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*
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* @param uri 查询的URI
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* @param projection 查询的列
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* @param selection 查询的条件
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* @param selectionArgs 查询条件的参数
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* @param sortOrder 排序方式
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* @return 返回Cursor，表示查询结果
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*/
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@Override
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public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
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Cursor c = null;
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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// 根据URI匹配码执行不同的查询操作
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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, sortOrder);
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break;
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case URI_NOTE_ITEM: // 查询单个笔记
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id = uri.getPathSegments().get(1);
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c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + 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, sortOrder);
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break;
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case URI_DATA_ITEM: // 查询单个数据
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id = uri.getPathSegments().get(1);
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c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + 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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if (sortOrder != null || projection != null) {
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throw new IllegalArgumentException("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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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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searchString = uri.getQueryParameter("pattern");
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}
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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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searchString = String.format("%%%s%%", searchString); // 添加通配符进行模糊查询
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c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString });
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} catch (IllegalStateException ex) {
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Log.e(TAG, "got exception: " + ex.toString());
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}
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri); // 未知的URI类型
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}
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// 如果Cursor不为空，设置通知URI，监听数据变化
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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;
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}
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/**
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* 处理插入请求。
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*
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* @param uri 插入的URI
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* @param values 要插入的数据
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* @return 返回新插入记录的URI
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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();
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long dataId = 0, noteId = 0, insertedId = 0;
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// 根据URI匹配码执行不同的插入操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 插入一条笔记
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);
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break;
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case URI_DATA: // 插入一条数据
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if (values.containsKey(DataColumns.NOTE_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); // 未知的URI类型
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}
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// 通知数据改变
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if (noteId > 0) {
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getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
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}
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if (dataId > 0) {
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getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
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}
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return ContentUris.withAppendedId(uri, insertedId); // 返回新记录的URI
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}
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/**
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* 处理删除请求。
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*
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* @param uri 删除的URI
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* @param selection 删除的条件
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* @param selectionArgs 删除条件的参数
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* @return 返回删除的记录数
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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;
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean deleteData = false;
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// 根据URI匹配码执行不同的删除操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 删除笔记
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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count = db.delete(TABLE.NOTE, selection, selectionArgs);
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break;
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case URI_NOTE_ITEM: // 删除单个笔记
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id = uri.getPathSegments().get(1);
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long noteId = Long.valueOf(id);
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if (noteId <= 0) { // 如果笔记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: // 删除数据
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count = db.delete(TABLE.DATA, selection, selectionArgs);
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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
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id = uri.getPathSegments().get(1);
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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); // 未知的URI类型
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}
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// 如果删除成功，通知数据变化
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if (count > 0) {
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if (deleteData) {
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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);
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}
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return count;
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}
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/**
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* 处理更新请求。
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*
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* @param uri 更新的URI
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* @param values 更新的内容
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* @param selection 更新的条件
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* @param selectionArgs 更新条件的参数
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* @return 返回更新的记录数
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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;
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean updateData = false;
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// 根据URI匹配码执行不同的更新操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE: // 更新笔记
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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);
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break;
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case URI_NOTE_ITEM: // 更新单个笔记
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id = uri.getPathSegments().get(1);
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 更新指定笔记版本
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count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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break;
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case URI_DATA: // 更新数据
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count = db.update(TABLE.DATA, values, selection, selectionArgs);
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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
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id = uri.getPathSegments().get(1);
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count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
|
|
|
|
|
updateData = true;
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri); // 未知的URI类型
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 如果更新成功，通知数据变化
|
|
|
|
|
if (count > 0) {
|
|
|
|
|
if (updateData) {
|
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
|
|
}
|
|
|
|
|
getContext().getContentResolver().notifyChange(uri, null);
|
|
|
|
|
}
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 辅助方法，解析选择条件。
|
|
|
|
|
*
|
|
|
|
|
* @param selection 选择条件
|
|
|
|
|
* @return 返回解析后的选择条件
|
|
|
|
|
*/
|
|
|
|
|
private String parseSelection(String selection) {
|
|
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 更新笔记的版本号。
|
|
|
|
|
*
|
|
|
|
|
* @param id 笔记ID
|
|
|
|
|
* @param selection 选择条件
|
|
|
|
|
* @param selectionArgs 选择条件参数
|
|
|
|
|
*/
|
|
|
|
|
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
|
|
|
|
|
StringBuilder sql = new StringBuilder(120);
|
|
|
|
|
sql.append("UPDATE ");
|
|
|
|
|
sql.append(TABLE.NOTE);
|
|
|
|
|
sql.append(" SET ");
|
|
|
|
|
sql.append(NoteColumns.VERSION);
|
|
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 ");
|
|
|
|
|
|
|
|
|
|
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更新版本
|
|
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
@Override
|
|
|
|
|
public String getType(Uri uri) {
|
|
|
|
|
// TODO Auto-generated method stub
|
|
|
|
|
return null;
|
|
|
|
|
}
|
|
|
|
|
}
|
