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1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.example.codelab.rssexample;
18 
19 import android.content.ContentProvider;
20 import android.content.ContentProviderDatabaseHelper;
21 import android.content.UriMatcher;
22 import android.content.Context;
23 import android.database.Cursor;
24 import android.database.SQLException;
25 import android.database.sqlite.SQLiteDatabase;
26 import android.database.sqlite.SQLiteQueryBuilder;
27 import android.net.Uri;
28 import android.content.ContentValues;
29 import android.text.TextUtils;
30 
31 import java.util.logging.Logger;
32 
33 // Content Provider for RSS feed information. Each row describes a single
34 // RSS feed. See the public static constants at the end of this class
35 // to learn what each record contains.
36 public class RssContentProvider extends ContentProvider {
37     private Logger mLogger = Logger.getLogger("com.example.codelab.rssexample");
38     private SQLiteDatabase mDb;
39     private DatabaseHelper mDbHelper = new DatabaseHelper();
40     private static final String DATABASE_NAME = "rssitems.db";
41     private static final String DATABASE_TABLE_NAME = "rssItems";
42     private static final int DB_VERSION = 1;
43     private static final int ALL_MESSAGES = 1;
44     private static final int SPECIFIC_MESSAGE = 2;
45 
46     // Set up our URL matchers to help us determine what an
47     // incoming URI parameter is.
48     private static final UriMatcher URI_MATCHER;
49     static{
50         URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
51         URI_MATCHER.addURI("my_rss_item", "rssitem", ALL_MESSAGES);
52         URI_MATCHER.addURI("my_rss_item", "rssitem/#", SPECIFIC_MESSAGE);
53     }
54 
55     // Here's the public URI used to query for RSS items.
56     public static final Uri CONTENT_URI = Uri.parse( "content://my_rss_item/rssitem");
57 
58     // Here are our column name constants, used to query for field values.
59     public static final String ID = "_id";
60     public static final String URL = "url";
61     public static final String TITLE = "title";
62     public static final String HAS_BEEN_READ = "hasbeenread";
63     public static final String CONTENT = "rawcontent";
64     public static final String LAST_UPDATED = "lastupdated";
65     public static final String DEFAULT_SORT_ORDER = TITLE + " DESC";
66 
67     // Database creation/version management helper.
68     // Create it statically because we don't need to have customized instances.
69     private static class DatabaseHelper extends ContentProviderDatabaseHelper{
70 
71         @Override
onCreate(SQLiteDatabase db)72         public void onCreate(SQLiteDatabase db){
73             try{
74                 String sql = "CREATE TABLE " + DATABASE_TABLE_NAME + "(" +
75                 ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
76                 URL + " TEXT," +
77                 TITLE + " TEXT," +
78                 HAS_BEEN_READ + " BOOLEAN DEFAULT 0," +
79                 CONTENT + " TEXT," +
80                 LAST_UPDATED + " INTEGER DEFAULT 0);";
81                 Logger.getLogger("com.example.codelab.rssexample").info("DatabaseHelper.onCreate(): SQL statement: " + sql);
82                 db.execSQL(sql);
83                 Logger.getLogger("com.example.codelab.rssexample").info("DatabaseHelper.onCreate(): Created a database");
84             } catch (SQLException e) {
85                 Logger.getLogger("com.example.codelab.rssexample").warning("DatabaseHelper.onCreate(): Couldn't create a database!");
86             }
87         }
88 
89         @Override
onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)90         public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
91             // Don't have any upgrades yet, so if this gets called for some reason we'll
92             // just drop the existing table, and recreate the database with the
93             // standard method.
94             db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE_NAME + ";");
95 
96         }
97     }
98 
99     @Override
onCreate()100     public boolean onCreate() {
101         // First we need to open the database. If this is our first time,
102         // the attempt to retrieve a database will throw
103         // FileNotFoundException, and we will then create the database.
104         final Context con = getContext();
105         try{
106             mDb = mDbHelper.openDatabase(getContext(), DATABASE_NAME, null, DB_VERSION);
107             mLogger.info("RssContentProvider.onCreate(): Opened a database");
108         } catch (Exception ex) {
109               return false;
110         }
111         if(mDb == null){
112             return false;
113         } else {
114             return true;
115         }
116     }
117 
118     // Convert the URI into a custom MIME type.
119     // Our UriMatcher will parse the URI to decide whether the
120     // URI is for a single item or a list.
121     @Override
getType(Uri uri)122     public String getType(Uri uri) {
123         switch (URI_MATCHER.match(uri)){
124             case ALL_MESSAGES:
125                 return "vnd.android.cursor.dir/rssitem"; // List of items.
126             case SPECIFIC_MESSAGE:
127                 return "vnd.android.cursor.item/rssitem";     // Specific item.
128             default:
129                 return null;
130         }
131     }
132 
133     @Override
query(Uri uri, String[] projection, String selection, String[] selectionArgs, String groupBy, String having, String sortOrder)134     public Cursor query(Uri uri, String[] projection, String selection,
135             String[] selectionArgs, String groupBy, String having, String sortOrder) {
136         // We won't bother checking the validity of params here, but you should!
137 
138         // SQLiteQueryBuilder is the helper class that creates the
139         // proper SQL syntax for us.
140         SQLiteQueryBuilder qBuilder = new SQLiteQueryBuilder();
141 
142         // Set the table we're querying.
143         qBuilder.setTables(DATABASE_TABLE_NAME);
144 
145         // If the query ends in a specific record number, we're
146         // being asked for a specific record, so set the
147         // WHERE clause in our query.
148         if((URI_MATCHER.match(uri)) == SPECIFIC_MESSAGE){
149             qBuilder.appendWhere("_id=" + uri.getPathLeafId());
150         }
151 
152         // Set sort order. If none specified, use default.
153         if(TextUtils.isEmpty(sortOrder)){
154             sortOrder = DEFAULT_SORT_ORDER;
155         }
156 
157         // Make the query.
158         Cursor c = qBuilder.query(mDb,
159                 projection,
160                 selection,
161                 selectionArgs,
162                 groupBy,
163                 having,
164                 sortOrder);
165         c.setNotificationUri(getContext().getContentResolver(), uri);
166         return c;
167     }
168 
169     @Override
update(Uri uri, ContentValues values, String whereClause)170     public int update(Uri uri, ContentValues values, String whereClause) {
171         // NOTE Argument checking code omitted. Check your parameters!
172         int updateCount = mDb.update(DATABASE_TABLE_NAME, values, whereClause);
173 
174         // Notify any listeners and return the updated row count.
175         getContext().getContentResolver().notifyUpdate(uri, null);
176         return updateCount;
177     }
178 
179     @Override
insert(Uri requestUri, ContentValues initialValues)180     public Uri insert(Uri requestUri, ContentValues initialValues) {
181         // NOTE Argument checking code omitted. Check your parameters! Check that
182         // your row addition request succeeded!
183 
184        long rowId = -1;
185        rowId = mDb.insert(DATABASE_TABLE_NAME, "rawcontent", initialValues);
186        Uri newUri = CONTENT_URI.addId(rowId);
187 
188        // Notify any listeners and return the URI of the new row.
189        getContext().getContentResolver().notifyInsert(CONTENT_URI, null);
190        return newUri;
191     }
192 
193     @Override
delete(Uri uri, String where)194     public int delete(Uri uri, String where) {
195         // NOTE Argument checking code omitted. Check your parameters!
196         int rowCount = mDb.delete(DATABASE_TABLE_NAME, ID + " = " + uri.getPathLeafId());
197 
198         // Notify any listeners and return the deleted row count.
199         getContext().getContentResolver().notifyDelete(uri, null);
200         return rowCount;
201     }
202 }
203