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387 lines
15 KiB
387 lines
15 KiB
/*
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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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* 笔记内容提供者类,用于管理笔记数据的访问
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*/
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public class NotesProvider extends ContentProvider {
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// URI匹配器
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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匹配类型常量
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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; // 单条笔记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; // 单条数据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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// 静态初始化URI匹配规则
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static {
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// 创建URI匹配器实例
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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// 添加各种URI匹配规则
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
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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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* 搜索结果的投影列
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* x'0A'表示sqlite中的换行符'\n'
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* 为了在搜索结果中显示更多信息,我们会去除标题和内容中的换行符和空格
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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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* 笔记搜索的SQL查询语句
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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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/**
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* 内容提供者创建时的回调方法
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*/
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@Override
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public boolean onCreate() {
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// 初始化数据库帮助类
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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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* 查询数据的方法
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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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// 初始化游标
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Cursor c = null;
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// 获取可读数据库实例
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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// 根据URI类型执行不同的查询操作
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switch (mMatcher.match(uri)) {
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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,
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sortOrder);
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break;
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case URI_NOTE_ITEM:
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// 查询单条笔记
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id = uri.getPathSegments().get(1);
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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,
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sortOrder);
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break;
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case URI_DATA_ITEM:
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// 查询单条数据
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id = uri.getPathSegments().get(1);
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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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// 检查查询参数
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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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// 获取搜索字符串
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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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// 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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try {
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// 格式化搜索字符串并执行查询
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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 });
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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);
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}
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// 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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}
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return c;
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}
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/**
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* 插入数据的方法
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*/
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/**
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* 插入数据到数据库中
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* @param uri 要插入数据的URI
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* @param values 要插入的数据
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* @return 插入数据后生成的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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// 获取可写数据库实例
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SQLiteDatabase db = mHelper.getWritableDatabase();
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// 初始化数据ID、笔记ID和插入ID
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long dataId = 0, noteId = 0, insertedId = 0;
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 插入笔记数据
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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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// 插入笔记内容数据
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if (values.containsKey(DataColumns.NOTE_ID)) {
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// 从values中获取笔记ID
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noteId = values.getAsLong(DataColumns.NOTE_ID);
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} else {
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// 记录错误日志:缺少笔记ID
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Log.d(TAG, "Wrong data format without note id:" + values.toString());
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}
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// 插入数据并获取插入ID
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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URI异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 通知笔记URI发生变化
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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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// 通知数据URI发生变化
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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);
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}
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/**
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* 删除数据的方法
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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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// 初始化删除计数
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int count = 0;
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String id = null;
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// 获取可写数据库实例
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean deleteData = false;
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// 根据URI类型执行不同的删除操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 删除笔记,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);
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break;
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case URI_NOTE_ITEM:
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// 删除单条笔记
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id = uri.getPathSegments().get(1);
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/**
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* ID小于0的是系统文件夹,不允许删除
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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;
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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;
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break;
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case URI_DATA_ITEM:
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// 删除单条数据
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id = uri.getPathSegments().get(1);
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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;
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 如果有数据被删除,发送通知
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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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* 更新数据的方法
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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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// 初始化更新计数
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int count = 0;
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String id = null;
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// 获取可写数据库实例
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean updateData = false;
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// 根据URI类型执行不同的更新操作
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 更新笔记
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increaseNoteVersion(-1, selection, selectionArgs);
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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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// 更新单条笔记
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id = uri.getPathSegments().get(1);
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
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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;
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break;
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case URI_DATA_ITEM:
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// 更新单条数据
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id = uri.getPathSegments().get(1);
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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;
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 如果有数据被更新,发送通知
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if (count > 0) {
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if (updateData) {
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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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* 解析选择条件的辅助方法
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*/
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private String parseSelection(String selection) {
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
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}
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/**
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* 增加笔记版本号的方法
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*/
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private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
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// 构建SQL更新语句
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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 ");
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// 添加WHERE子句
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if (id > 0 || !TextUtils.isEmpty(selection)) {
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sql.append(" WHERE ");
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}
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if (id > 0) {
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sql.append(NoteColumns.ID + "=" + String.valueOf(id));
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}
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if (!TextUtils.isEmpty(selection)) {
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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);
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}
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sql.append(selectString);
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}
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// 执行SQL语句
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mHelper.getWritableDatabase().execSQL(sql.toString());
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}
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/**
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* 获取MIME类型的方法
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*/
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@Override
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public String getType(Uri uri) {
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// TODO Auto-generated method stub
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return null;
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}
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}
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