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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;//放在data包中
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import android.app.SearchManager; //提供对系统搜索的访问
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import android.content.ContentProvider; //Android提供的应用程序之间的数据共享
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import android.content.ContentUris; //用于获取uri路径后面的ID部分
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import android.content.ContentValues; //一种存储机制
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import android.content.Intent; //传输
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import android.content.UriMatcher;//用于匹配URI
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import android.database.Cursor; //用于Android数据库的操作
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import android.database.sqlite.SQLiteDatabase; //Android数据库管理
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import android.net.Uri; //应用程序的跳转
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import android.text.TextUtils; //处理字符串，不用考虑正则表达式
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import android.util.Log; //打印日志信息
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import net.micode.notes.R;
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import net.micode.notes.data.Notes.DataColumns; //自己包中的类
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import net.micode.notes.data.Notes.NoteColumns; //自己包中的类
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import net.micode.notes.data.NotesDatabaseHelper.TABLE; //接口
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public class NotesProvider extends ContentProvider { //继承于contentprovider
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private static final UriMatcher mMatcher; //定义一个URImatcher类的私有静态常量对象
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private NotesDatabaseHelper mHelper; //一个自己包中的类的私有对象
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private static final String TAG = "NotesProvider"; //一个静态常量string类的对象
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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 { //静态代码块，在程序创建jvm时就运行，只执行一次
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH); //创建，并传入没有匹配的URI的返回码
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); //
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // /#为通配符
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); //adduri用来注册URI的
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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); // /* 为任意字符
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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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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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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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@Override //重写
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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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@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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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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switch (mMatcher.match(uri)) { //现有的URI与注册的URI进行匹配
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case URI_NOTE:
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
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sortOrder); //查询note表
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break;
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case URI_NOTE_ITEM:
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id = uri.getPathSegments().get(1); //将URI分割，1代表的是id
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c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder); //查询id
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break;
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case URI_DATA:
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
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sortOrder); //查询data数据表
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break;
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case URI_DATA_ITEM:
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id = uri.getPathSegments().get(1); //将URI分割，获得id
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c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder); //查询该id
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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) { //两者其一不为空
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throw new IllegalArgumentException(
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"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); //抛出异常
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}
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String searchString = null;
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { //路径是否匹配
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if (uri.getPathSegments().size() > 1) { //截取的路径list表的大小
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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)) { //是否为空
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return null;
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}
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try {
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searchString = String.format("%%%s%%", searchString); //字符串的加工
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c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
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new String[] { searchString }); //sql语句查询，并替换
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} catch (IllegalStateException ex) {
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Log.e(TAG, "got exception: " + ex.toString()); //记录日志
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}
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri); //抛出异常
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}
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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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@Override
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public Uri insert(Uri uri, ContentValues values) { //重写插入
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SQLiteDatabase db = mHelper.getWritableDatabase(); //获得数据库对象
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long dataId = 0, noteId = 0, insertedId = 0;
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switch (mMatcher.match(uri)) { //URI路径是否匹配
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case URI_NOTE: //note等于匹配码
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insertedId = noteId = db.insert(TABLE.NOTE, null, values); //插入
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break;
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case URI_DATA: //等于data的匹配码
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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()); //记录日志
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}
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insertedId = dataId = db.insert(TABLE.DATA, null, values);
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// Notify the note uri
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if (noteId > 0) {
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getContext().getContentResolver().notifyChange(
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ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
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}
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// Notify the data uri
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if (dataId > 0) {
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getContext().getContentResolver().notifyChange(
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ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
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}
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return ContentUris.withAppendedId(uri, insertedId);
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}
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@Override
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public int delete(Uri uri, String selection, String[] selectionArgs) { //重写delete方法
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int count = 0;
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase(); //获取数据库对象
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boolean deleteData = false;
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switch (mMatcher.match(uri)) { //获得匹配码
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case URI_NOTE:
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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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id = uri.getPathSegments().get(1);
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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;
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}
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count = db.delete(TABLE.NOTE,
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NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); //删除
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break;
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case URI_DATA:
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count = db.delete(TABLE.DATA, selection, selectionArgs); //删除data
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deleteData = true;
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break;
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case URI_DATA_ITEM:
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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); //删除dataitem
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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); //抛出异常
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}
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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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@Override
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public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { //重写更新方法
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int count = 0;
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase(); //获得数据库对象
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boolean updateData = false;
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switch (mMatcher.match(uri)) {
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case URI_NOTE: //获得查询匹配码
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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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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 //note的更新
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+ parseSelection(selection), selectionArgs);
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break;
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case URI_DATA:
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count = db.update(TABLE.DATA, values, selection, selectionArgs); //data的更新
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updateData = true;
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break;
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case URI_DATA_ITEM:
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id = uri.getPathSegments().get(1);
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count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id //dataitem的更新
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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); //抛出没有参数的异常
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}
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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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private String parseSelection(String selection) {
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
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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); //容量为120
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sql.append("UPDATE "); //拼接更新
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sql.append(TABLE.NOTE); //note数据列
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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 "); //位置
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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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mHelper.getWritableDatabase().execSQL(sql.toString());
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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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