net.doo.snap.blob

Class BlobManager

java.lang.Object

net.doo.snap.blob.BlobManager

public class BlobManager
extends java.lang.Object

Manages binary files on local filesystem and provides access to binary files stored remotely

Constructor Summary

Constructors

Constructor and Description
BlobManager(BlobStoreStrategy blobStoreStrategy, android.app.DownloadManager downloadManager, android.content.SharedPreferences sharedPreferences, android.content.res.AssetManager assetManager, BlobFactory blobFactory)

Method Summary

Modifier and Type	Method and Description
boolean	allBlobsAvailable(java.util.Collection<Blob> blobs)
java.util.HashSet<Blob>	blobsToDownload(java.util.Collection<Language> languages)
long	fetch(Blob blob, boolean allowMeteredNetwork) Launches asynchronous fetch of a given Blob if it is not already available in local destination folder.
java.util.Set<Language>	getAllLanguagesWithAvailableOcrBlobs()
boolean	hasActiveDownloads()
boolean	isBlobAvailable(Blob blob)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BlobManager

public BlobManager(BlobStoreStrategy blobStoreStrategy,
                   android.app.DownloadManager downloadManager,
                   android.content.SharedPreferences sharedPreferences,
                   android.content.res.AssetManager assetManager,
                   BlobFactory blobFactory)

Method Detail

allBlobsAvailable

public boolean allBlobsAvailable(java.util.Collection<Blob> blobs)

Returns:

true if all blobs from collection are available locally. false if at least one blob is not available. If collection is empty returns true

isBlobAvailable

public boolean isBlobAvailable(Blob blob)

Returns:

true if Blob is available on local filesystem. false otherwise.

getAllLanguagesWithAvailableOcrBlobs

public java.util.Set<Language> getAllLanguagesWithAvailableOcrBlobs()
                                                             throws java.io.IOException

Returns:

set of all languages for which OCR binaries are present on local filesystem

Throws:

java.io.IOException

See Also:

isBlobAvailable(net.doo.snap.entity.Blob)

fetch

public long fetch(Blob blob,
                  boolean allowMeteredNetwork)
           throws java.io.IOException

Launches asynchronous fetch of a given Blob if it is not already available in local destination folder. Might perform blocking operations, so it should not be called from the main thread.

Returns:

id of fetch or -1 if blob is available locally

Throws:

java.io.IOException

See Also:

DownloadManager.enqueue(DownloadManager.Request), isBlobAvailable(net.doo.snap.entity.Blob)

hasActiveDownloads

public boolean hasActiveDownloads()

Returns:

true if some blobs are still in fetch process (or paused). false if all requested downloads completed. This method performs blocking operation, so it should not be called from the main thread.

blobsToDownload

public java.util.HashSet<Blob> blobsToDownload(java.util.Collection<Language> languages)

Parameters:

languages -

Returns:

set of Blob that should be downloaded for given languages to perform OCR