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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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* 该类是一个内容提供者，用于处理对便签数据库的增删改查操作，并支持搜索功能。
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* 它继承自ContentProvider，提供了对便签表和数据记录表的访问接口。
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*/
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public class NotesProvider extends ContentProvider {
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// URI匹配器，用于匹配不同的URI请求
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private static final UriMatcher mMatcher;
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// 数据库帮助类实例
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private NotesDatabaseHelper mHelper;
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// 日志标签，方便调试和日志记录
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private static final String TAG = "NotesProvider";
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// 定义不同URI的匹配码
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private static final int URI_NOTE = 1;
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private static final int URI_NOTE_ITEM = 2;
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private static final int URI_DATA = 3;
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private static final int URI_DATA_ITEM = 4;
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private static final int URI_SEARCH = 5;
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private static final int URI_SEARCH_SUGGEST = 6;
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static {
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// 初始化URI匹配器
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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// 添加不同URI的匹配规则
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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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* 便签搜索的投影，定义了搜索结果的列
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* x'0A'表示sqlite中的'\n'字符，用于去除搜索结果中的换行符和空格，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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// 便签片段搜索的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
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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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* 内容提供者创建时调用，初始化数据库帮助类
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*
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* @return 创建成功返回true，否则返回false
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*/
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@Override
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public boolean onCreate() {
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// 获取数据库帮助类实例
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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，根据不同的URI匹配码执行相应的查询操作
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*
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* @param uri 请求的URI
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* @param projection 查询的列
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* @param selection 查询条件
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* @param selectionArgs 查询条件的参数
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* @param sortOrder 排序规则
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* @return 查询结果的游标
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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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Cursor c = null;
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// 获取可读数据库
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 查询便签表
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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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// 获取便签ID
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id = uri.getPathSegments().get(1);
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// 查询指定ID的便签
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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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// 查询数据记录表
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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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// 获取数据记录ID
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id = uri.getPathSegments().get(1);
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// 查询指定ID的数据记录
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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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// 搜索查询不允许指定排序规则和投影列
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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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if (uri.getPathSegments().size() > 1) {
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// 从URI路径中获取搜索字符串
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searchString = uri.getPathSegments().get(1);
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}
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} else {
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// 从URI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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if (TextUtils.isEmpty(searchString)) {
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// 搜索字符串为空，返回null
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return null;
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}
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try {
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// 处理搜索字符串，添加通配符
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searchString = String.format("%%%s%%", searchString);
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// 执行搜索查询
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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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// 处理查询异常
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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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// 未知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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// 设置游标通知URI，当数据变化时通知观察者
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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，根据不同的URI匹配码将数据插入到相应的表中
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*
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* @param uri 请求的URI
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* @param values 要插入的数据
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* @return 插入数据的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
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SQLiteDatabase db = mHelper.getWritableDatabase();
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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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// 插入便签数据
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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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if (values.containsKey(DataColumns.NOTE_ID)) {
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// 获取便签ID
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noteId = values.getAsLong(DataColumns.NOTE_ID);
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} else {
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// 数据格式错误，记录日志
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Log.d(TAG, "Wrong data format without note id:" + values.toString());
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}
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// 插入数据记录
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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，抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 通知便签URI数据变化
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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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// 通知数据记录URI数据变化
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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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* 处理删除请求，根据不同的URI匹配码从相应的表中删除数据
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*
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* @param uri 请求的URI
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* @param selection 删除条件
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* @param selectionArgs 删除条件的参数
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* @return 删除的数据行数
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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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// 获取可写数据库
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean deleteData = false;
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 处理删除便签的条件
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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// 删除便签数据
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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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// 获取便签ID
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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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// 删除指定ID的便签
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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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// 删除数据记录
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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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// 获取数据记录ID
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id = uri.getPathSegments().get(1);
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// 删除指定ID的数据记录
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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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// 未知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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// 通知便签URI数据变化
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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// 通知当前URI数据变化
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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，根据不同的URI匹配码更新相应表中的数据，并增加便签版本号
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*
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* @param uri 请求的URI
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* @param values 要更新的数据
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* @param selection 更新条件
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* @param selectionArgs 更新条件的参数
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* @return 更新的数据行数
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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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int count = 0;
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String id = null;
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// 获取可写数据库
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean updateData = false;
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 增加便签版本号
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increaseNoteVersion(-1, selection, selectionArgs);
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// 更新便签数据
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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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// 获取便签ID
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id = uri.getPathSegments().get(1);
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// 增加指定ID便签的版本号
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
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// 更新指定ID的便签
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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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// 更新数据记录
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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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// 获取数据记录ID
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id = uri.getPathSegments().get(1);
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// 更新指定ID的数据记录
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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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// 未知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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// 通知便签URI数据变化
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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// 通知当前URI数据变化
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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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* 解析查询条件，添加额外的条件
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*
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* @param selection 查询条件
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* @return 解析后的查询条件
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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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* 增加便签的版本号，根据ID和查询条件更新便签的版本号
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*
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* @param id 便签ID
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* @param selection 查询条件
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* @param selectionArgs 查询条件的参数
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*/
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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 ");
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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));
|
|
|
}
|
|
|
if (!TextUtils.isEmpty(selection)) {
|
|
|
String selectString = id > 0 ? parseSelection(selection) : selection;
|
|
|
for (String args : selectionArgs) {
|
|
|
selectString = selectString.replaceFirst("\\?", args);
|
|
|
}
|
|
|
sql.append(selectString);
|
|
|
}
|
|
|
|
|
|
// 执行更新版本号的SQL语句
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 获取URI对应的MIME类型，目前未实现
|
|
|
*
|
|
|
* @param uri 请求的URI
|
|
|
* @return MIME类型
|
|
|
*/
|
|
|
@Override
|
|
|
public String getType(Uri uri) {
|
|
|
// TODO Auto-generated method stub
|
|
|
return null;
|
|
|
}
|
|
|
} |
