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Apache License
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package grevian.MediaLibrary; //ww w.java 2s.c o m import java.util.HashMap; import android.content.ContentProvider; import android.content.ContentUris; import android.content.ContentValues; import android.content.Context; import android.content.UriMatcher; 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; import java.util.Random; public class MediaContentProvider extends ContentProvider { private final static String TAG = MediaContentProvider.class .getSimpleName(); private final static String DATABASE_NAME = "mGrevianDB.db"; private final static String DATABASE_TABLE = "t_media"; private final static int DATABASE_VERSION = 2; private static final int MEDIA = 1; private static final int MEDIA_UPC = 2; private static final int MEDIA_SEARCH = 3; private static final UriMatcher sUriMatcher; private static HashMap<String, String> sMediaProjectionMap; SQLDataSource mDataSource; public static final Uri CONTENT_URI = Uri .parse("content://grevian.MediaLibrary.MediaContentProvider"); private class SQLDataSource extends SQLiteOpenHelper { SQLDataSource(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); // TODO: Clear the DB every load for a clean DB for now. // onUpgrade(this.getWritableDatabase(), 1, 2); // insertRandomRows(30); } @SuppressWarnings("unused") private void insertRandomRows(int entries) { // Initialize required objects ContentValues values = new ContentValues(); String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; StringBuilder titleBuilder = new StringBuilder(); Random mRand = new Random(); for (int i = 0; i < entries; i++ ) { // Clear existing objects (Object creation is expensive, so avoid recreating them) values.clear(); titleBuilder.delete(0, titleBuilder.length()); // Stick a not really real barcode into the values values.put("barcode", 10000+i); // about half and half for owned vs not owned if ( Math.random() < 0.5 ) values.put("owned", 1); else values.put("owned", 0); // Loaned and Summary will always be empty for now, values.put("loaned", ""); values.put("summary", ""); // generate a random 20 character title from the allowable characters for (int p = 0; p < 20; p++) { titleBuilder.append(chars.charAt(mRand.nextInt(chars.length()))); } values.put("title", titleBuilder.toString()); // Insert into the database this.getWritableDatabase().insert(DATABASE_TABLE, null, values); } } @Override public void onCreate(SQLiteDatabase db) { db .execSQL("" + "create table " + DATABASE_TABLE + "( barcode integer primary key, title varchar, owned int(2), loaned varchar, summary varchar ); " + ""); } @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 " + DATABASE_TABLE); onCreate(db); } } @Override public boolean onCreate() { mDataSource = new SQLDataSource(getContext()); return true; } @Override public Uri insert(Uri uri, ContentValues initialValues) { // Validate the requested uri if (sUriMatcher.match(uri) != MEDIA) { throw new IllegalArgumentException("Unknown URI " + uri); } SQLiteDatabase db = mDataSource.getWritableDatabase(); long rowId = db.insert(DATABASE_TABLE, "", initialValues); if (rowId > 0) { Uri noteUri = ContentUris.withAppendedId(Media.CONTENT_URI, rowId); getContext().getContentResolver().notifyChange(noteUri, null); return noteUri; } throw new SQLException("Failed to insert row into " + uri); } @Override public int delete(Uri uri, String where, String[] whereArgs) { SQLiteDatabase db = mDataSource.getWritableDatabase(); int count; switch (sUriMatcher.match(uri)) { case MEDIA: count = db.delete(DATABASE_TABLE, where, whereArgs); break; case MEDIA_UPC: String noteId = uri.getPathSegments().get(1); count = db.delete(DATABASE_TABLE, Media.BARCODE + "=" + noteId + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; case MEDIA_SEARCH: throw new IllegalArgumentException("Cannot Delete wildcards."); default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } @Override public String getType(Uri uri) { switch (sUriMatcher.match(uri)) { case MEDIA: return Media.CONTENT_TYPE; case MEDIA_UPC: return Media.CONTENT_ITEM_TYPE; case MEDIA_SEARCH: return Media.CONTENT_TYPE; default: throw new IllegalArgumentException("Unknown URI " + uri); } } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { SQLiteQueryBuilder qb = new SQLiteQueryBuilder(); Log.i(TAG, "Executing Query in MediaContentProvider for uri: " + uri.toString()); qb.setTables(DATABASE_TABLE); qb.setProjectionMap(sMediaProjectionMap); switch (sUriMatcher.match(uri)) { case MEDIA: break; case MEDIA_UPC: qb.appendWhere(Media.BARCODE + "=" + uri.getPathSegments().get(1)); break; case MEDIA_SEARCH: // FIXME: Probably injectable... qb.appendWhere(Media.TITLE + " like '%" + uri.getPathSegments().get(1) + "%'"); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } // If no sort order is specified use the default, otherwise use whatever was passed in if (TextUtils.isEmpty(sortOrder)) { sortOrder = Media.DEFAULT_SORT_ORDER; } // Get the database and run the query SQLiteDatabase db = mDataSource.getReadableDatabase(); Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, sortOrder); // Tell the cursor what uri to watch, so it knows when its source data // changes c.setNotificationUri(getContext().getContentResolver(), uri); return c; } @Override public int update(Uri uri, ContentValues values, String where, String[] whereArgs) { SQLiteDatabase db = mDataSource.getWritableDatabase(); int count; switch (sUriMatcher.match(uri)) { case MEDIA: count = db.update(DATABASE_TABLE, values, where, whereArgs); break; case MEDIA_UPC: String noteId = uri.getPathSegments().get(1); count = db.update(DATABASE_TABLE, values, Media.BARCODE + "=" + noteId + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; case MEDIA_SEARCH: throw new IllegalArgumentException("Cannot update Wildcards"); default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } static { sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH); sUriMatcher.addURI(MediaLibrary.AUTHORITY, "media", MEDIA); sUriMatcher.addURI(MediaLibrary.AUTHORITY, "media/#", MEDIA_UPC); sUriMatcher.addURI(MediaLibrary.AUTHORITY, "search/*", MEDIA_SEARCH); sUriMatcher.addURI(MediaLibrary.AUTHORITY, "search/", MEDIA); sMediaProjectionMap = new HashMap<String, String>(); sMediaProjectionMap.put(Media.BARCODE, Media.BARCODE); sMediaProjectionMap.put(Media.TITLE, Media.TITLE); sMediaProjectionMap.put(Media.OWNED, Media.OWNED); sMediaProjectionMap.put(Media.LOANED, Media.LOANED); } }