/**
* Get the Mime type of an Asset based on its type. If the Asset already has the "content-type"
* property set, we return that. Otherwise the Apache Tika library is used to do file type
* detection.
*
* @return A string representation of the content type suitable for use in an HTTP header. Eg.
* "image/jpeg" for a jpeg image.
*/
public <T> String getMimeType(Entity entity, T type) {
Map<String, Object> fileMetadata = AssetUtils.getFileMetadata(entity);
if (fileMetadata.get(AssetUtils.CONTENT_TYPE) != null) {
return (String) fileMetadata.get(AssetUtils.CONTENT_TYPE);
}
Metadata metadata = new Metadata();
MediaType mediaType = MediaType.OCTET_STREAM;
try {
if (type instanceof byte[]) {
ByteArrayInputStream bais = new ByteArrayInputStream((byte[]) type);
mediaType = detector.detect(bais, metadata);
} else if (type instanceof File) {
InputStream fis = new BufferedInputStream(new FileInputStream((File) type));
try {
mediaType = detector.detect(fis, metadata);
} finally {
fis.close();
}
} else {
return mediaType.toString();
}
fileMetadata.put(AssetUtils.CONTENT_TYPE, mediaType.toString());
} catch (IOException e) {
LOG.error("error detecting mime type", e);
}
return mediaType.toString();
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
this.db = db;
Log.i(Constants.TAG, "Upgrading database version from " + oldVersion + " to " + newVersion);
UpgradeProcessor.process(oldVersion, newVersion);
try {
for (String sqlFile : AssetUtils.list(SQL_DIR, mContext.getAssets())) {
if (sqlFile.startsWith(UPGRADE_QUERY_PREFIX)) {
int fileVersion =
Integer.parseInt(
sqlFile.substring(
UPGRADE_QUERY_PREFIX.length(),
sqlFile.length() - UPGRADE_QUERY_SUFFIX.length()));
if (fileVersion > oldVersion && fileVersion <= newVersion) {
execSqlFile(sqlFile, db);
}
}
}
Log.i(Constants.TAG, "Database upgrade successful");
} catch (IOException e) {
throw new RuntimeException("Database upgrade failed", e);
}
}
