Class BlobInfoFactory (2.0.0)

public class BlobInfoFactory

BlobInfoFactory provides a trivial interface for retrieving BlobInfo metadata.

BlobInfo metadata is stored in read-only BlobInfo entities in the datastore. This class provides an easy way to access these entities. For more complex queries, you can use the datastore directly.

Inheritance

java.lang.Object > BlobInfoFactory

Inherited Members

Object.clone()

Object.equals(Object)

Object.finalize()

Object.getClass()

Object.hashCode()

Object.notify()

Object.notifyAll()

Object.toString()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Static Fields

CONTENT_TYPE

public static final String CONTENT_TYPE

Field Value
Type	Description
String

CREATION

public static final String CREATION

Field Value
Type	Description
String

FILENAME

public static final String FILENAME

Field Value
Type	Description
String

GS_OBJECT_NAME

public static final String GS_OBJECT_NAME

Field Value
Type	Description
String

KIND

public static final String KIND

Field Value
Type	Description
String

MD5_HASH

public static final String MD5_HASH

Field Value
Type	Description
String

SIZE

public static final String SIZE

Field Value
Type	Description
String

Constructors

BlobInfoFactory()

public BlobInfoFactory()

Creates a BlobInfoFactory that uses the default implementation of DatastoreService.

BlobInfoFactory(DatastoreService datastoreService)

public BlobInfoFactory(DatastoreService datastoreService)

Creates a BlobInfoFactory with the specified implementation of DatastoreService.

Parameter
Name	Description
datastoreService	DatastoreService

Methods

createBlobInfo(Entity entity)

public BlobInfo createBlobInfo(Entity entity)

Creates a BlobInfo by extracting content from the specified Entity.

Parameter
Name	Description
entity	Entity

Returns
Type	Description
BlobInfo

loadBlobInfo(BlobKey blobKey)

public @Nullable BlobInfo loadBlobInfo(BlobKey blobKey)

Loads the BlobInfo metadata for blobKey. Returns null if no matching blob is found.

Parameter
Name	Description
blobKey	BlobKey

Returns
Type	Description
@org.checkerframework.checker.nullness.qual.Nullable com.google.appengine.api.blobstore.BlobInfo

queryBlobInfos()

public Iterator<BlobInfo> queryBlobInfos()

Queries for BlobInfo instances, beginning with the BlobKey that appears first in lexicographic order.

Returns
Type	Description
Iterator<BlobInfo>

queryBlobInfosAfter(@Nullable BlobKey previousBlob)

public Iterator<BlobInfo> queryBlobInfosAfter(@Nullable BlobKey previousBlob)

Queries for BlobInfo instances, beginning at the blob following previousBlob in lexicographic order. If previousBlob is null, the first blob will be returned.

This is useful for displaying discrete pages of blobs.

Parameter
Name	Description
previousBlob	@org.checkerframework.checker.nullness.qual.Nullable com.google.appengine.api.blobstore.BlobKey

Returns
Type	Description
Iterator<BlobInfo>