BookProviderMetaData
package com.ai.android.HelloWorld.bookprovider;
import android.net.Uri;
import android.provider.BaseColumns;
public class BookProviderMetaData
{
public static final String AUTHORITY = "com.androidbook.provider.BookProvider";
public static final String DATABASE_NAME = "book.db";
public static final int DATABASE_VERSION = 1;
public static final String BOOKS_TABLE_NAME = "books";
private BookProviderMetaData() {}
//inner class describing columns and their types
public static final class BookTableMetaData implements BaseColumns
{
private BookTableMetaData() {}
public static final String TABLE_NAME = "books";
//uri and mime type definitions
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/books");
public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.androidbook.book";
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.androidbook.book";
public static final String DEFAULT_SORT_ORDER = "modified DESC";
//Additional Columns start here.
//string type
public static final String BOOK_NAME = "name";
//string type
public static final String BOOK_ISBN = "isbn";
//string type
public static final String BOOK_AUTHOR = "author";
//Integer from System.currentTimeMillis()
public static final String CREATED_DATE = "created";
//Integer from System.currentTimeMillis()
public static final String MODIFIED_DATE = "modified";
}
}
BookProvider
package com.ai.android.HelloWorld.bookprovider;
import java.util.HashMap;
import com.ai.android.HelloWorld.bookprovider.BookProviderMetaData.BookTableMetaData;
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
public class BookProvider extends ContentProvider
{
//Logging helper tag. No significance to providers.
private static final String TAG = "BookProvider";
//Projection maps are similar to "as" construct
//in an sql statement where by you can rename the
//columns.
private static HashMap<String, String> sBooksProjectionMap;
static
{
sBooksProjectionMap = new HashMap<String, String>();
sBooksProjectionMap.put(BookTableMetaData._ID, BookTableMetaData._ID);
//name, isbn, author
sBooksProjectionMap.put(BookTableMetaData.BOOK_NAME, BookTableMetaData.BOOK_NAME);
sBooksProjectionMap.put(BookTableMetaData.BOOK_ISBN, BookTableMetaData.BOOK_ISBN);
sBooksProjectionMap.put(BookTableMetaData.BOOK_AUTHOR, BookTableMetaData.BOOK_AUTHOR);
//created date, modified date
sBooksProjectionMap.put(BookTableMetaData.CREATED_DATE, BookTableMetaData.CREATED_DATE);
sBooksProjectionMap.put(BookTableMetaData.MODIFIED_DATE, BookTableMetaData.MODIFIED_DATE);
}
//Provide a mechanism to identify
//all the incoming uri patterns.
private static final UriMatcher sUriMatcher;
private static final int INCOMING_BOOK_COLLECTION_URI_INDICATOR = 1;
private static final int INCOMING_SINGLE_BOOK_URI_INDICATOR = 2;
static {
sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
sUriMatcher.addURI(BookProviderMetaData.AUTHORITY, "books", INCOMING_BOOK_COLLECTION_URI_INDICATOR);
sUriMatcher.addURI(BookProviderMetaData.AUTHORITY, "books/#", INCOMING_SINGLE_BOOK_URI_INDICATOR);
}
/**
* This class helps open, create, and upgrade the database file.
*/
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, BookProviderMetaData.DATABASE_NAME, null, BookProviderMetaData.DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + BookTableMetaData.TABLE_NAME + " ("
+ BookProviderMetaData.BookTableMetaData._ID + " INTEGER PRIMARY KEY,"
+ BookTableMetaData.BOOK_NAME + " TEXT,"
+ BookTableMetaData.BOOK_ISBN + " TEXT,"
+ BookTableMetaData.BOOK_AUTHOR + " TEXT,"
+ BookTableMetaData.CREATED_DATE + " INTEGER,"
+ BookTableMetaData.MODIFIED_DATE + " INTEGER"
+ ");");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS " + BookTableMetaData.TABLE_NAME);
onCreate(db);
}
}
private DatabaseHelper mOpenHelper;
@Override
public boolean onCreate() {
mOpenHelper = new DatabaseHelper(getContext());
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) {
SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
switch (sUriMatcher.match(uri)) {
case INCOMING_BOOK_COLLECTION_URI_INDICATOR:
qb.setTables(BookTableMetaData.TABLE_NAME);
qb.setProjectionMap(sBooksProjectionMap);
break;
case INCOMING_SINGLE_BOOK_URI_INDICATOR:
qb.setTables(BookTableMetaData.TABLE_NAME);
qb.setProjectionMap(sBooksProjectionMap);
qb.appendWhere(BookTableMetaData._ID + "=" + uri.getPathSegments().get(1));
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
// If no sort order is specified use the default
String orderBy;
if (TextUtils.isEmpty(sortOrder)) {
orderBy = BookTableMetaData.DEFAULT_SORT_ORDER;
} else {
orderBy = sortOrder;
}
// Get the database and run the query
SQLiteDatabase db = mOpenHelper.getReadableDatabase();
Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, orderBy);
int i = c.getCount();
// Tell the cursor what uri to watch, so it knows when its source data changes
c.setNotificationUri(getContext().getContentResolver(), uri);
return c;
}
@Override
public String getType(Uri uri) {
switch (sUriMatcher.match(uri)) {
case INCOMING_BOOK_COLLECTION_URI_INDICATOR:
return BookTableMetaData.CONTENT_TYPE;
case INCOMING_SINGLE_BOOK_URI_INDICATOR:
return BookTableMetaData.CONTENT_ITEM_TYPE;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
}
@Override
public Uri insert(Uri uri, ContentValues initialValues) {
// Validate the requested uri
if (sUriMatcher.match(uri) != INCOMING_BOOK_COLLECTION_URI_INDICATOR) {
throw new IllegalArgumentException("Unknown URI " + uri);
}
ContentValues values;
if (initialValues != null) {
values = new ContentValues(initialValues);
} else {
values = new ContentValues();
}
Long now = Long.valueOf(System.currentTimeMillis());
// Make sure that the fields are all set
if (values.containsKey(BookTableMetaData.CREATED_DATE) == false) {
values.put(BookTableMetaData.CREATED_DATE, now);
}
if (values.containsKey(BookTableMetaData.MODIFIED_DATE) == false) {
values.put(BookTableMetaData.MODIFIED_DATE, now);
}
if (values.containsKey(BookTableMetaData.BOOK_NAME) == false) {
throw new SQLException("Failed to insert row because Book Name is needed " + uri);
}
if (values.containsKey(BookTableMetaData.BOOK_ISBN) == false) {
values.put(BookTableMetaData.BOOK_ISBN, "Unknown ISBN");
}
if (values.containsKey(BookTableMetaData.BOOK_AUTHOR) == false) {
values.put(BookTableMetaData.BOOK_ISBN, "Unknown Author");
}
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
long rowId = db.insert(BookTableMetaData.TABLE_NAME, BookTableMetaData.BOOK_NAME, values);
if (rowId > 0) {
Uri insertedBookUri = ContentUris.withAppendedId(BookTableMetaData.CONTENT_URI, rowId);
getContext().getContentResolver().notifyChange(insertedBookUri, null);
return insertedBookUri;
}
throw new SQLException("Failed to insert row into " + uri);
}
@Override
public int delete(Uri uri, String where, String[] whereArgs) {
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
int count;
switch (sUriMatcher.match(uri)) {
case INCOMING_BOOK_COLLECTION_URI_INDICATOR:
count = db.delete(BookTableMetaData.TABLE_NAME, where, whereArgs);
break;
case INCOMING_SINGLE_BOOK_URI_INDICATOR:
String rowId = uri.getPathSegments().get(1);
count = db.delete(BookTableMetaData.TABLE_NAME, BookTableMetaData._ID + "=" + rowId
+ (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
@Override
public int update(Uri uri, ContentValues values, String where, String[] whereArgs) {
SQLiteDatabase db = mOpenHelper.getWritableDatabase();
int count;
switch (sUriMatcher.match(uri)) {
case INCOMING_BOOK_COLLECTION_URI_INDICATOR:
count = db.update(BookTableMetaData.TABLE_NAME, values, where, whereArgs);
break;
case INCOMING_SINGLE_BOOK_URI_INDICATOR:
String rowId = uri.getPathSegments().get(1);
count = db.update(BookTableMetaData.TABLE_NAME, values, BookTableMetaData._ID + "=" + rowId
+ (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs);
break;
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}
getContext().getContentResolver().notifyChange(uri, null);
return count;
}
}
