java.lang.Object
- com.google.appengine.api.blobstore.BlobInfoFactory

```
public class BlobInfoFactory
extends Object
```
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.

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`CONTENT_TYPE`
`static String`	`CREATION`
`static String`	`FILENAME`
`static String`	`GS_OBJECT_NAME`
`static String`	`KIND`
`static String`	`MD5_HASH`
`static String`	`SIZE`

Constructor Summary

Constructors
Constructor	Description
`BlobInfoFactory()`	Creates a `BlobInfoFactory` that uses the default implementation of `DatastoreService`.
`BlobInfoFactory(DatastoreService datastoreService)`	Creates a `BlobInfoFactory` with the specified implementation of `DatastoreService`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`BlobInfo`	`createBlobInfo(Entity entity)`	Creates a `BlobInfo` by extracting content from the specified `Entity`.
`@Nullable BlobInfo`	`loadBlobInfo(BlobKey blobKey)`	Loads the `BlobInfo` metadata for `blobKey`.
`Iterator<BlobInfo>`	`queryBlobInfos()`	Queries for `BlobInfo` instances, beginning with the `BlobKey` that appears first in lexicographic order.
`Iterator<BlobInfo>`	`queryBlobInfosAfter(@Nullable BlobKey previousBlob)`	Queries for `BlobInfo` instances, beginning at the blob following `previousBlob` in lexicographic order.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - KIND
```
public static final String KIND
```
    See Also:
    
    Constant Field Values
  - CONTENT_TYPE
```
public static final String CONTENT_TYPE
```
    See Also:
    
    Constant Field Values
  - CREATION
```
public static final String CREATION
```
    See Also:
    
    Constant Field Values
  - FILENAME
```
public static final String FILENAME
```
    See Also:
    
    Constant Field Values
  - SIZE
```
public static final String SIZE
```
    See Also:
    
    Constant Field Values
  - MD5_HASH
```
public static final String MD5_HASH
```
    See Also:
    
    Constant Field Values
  - GS_OBJECT_NAME
```
public static final String GS_OBJECT_NAME
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - BlobInfoFactory
```
public BlobInfoFactory()
```
    Creates a BlobInfoFactory that uses the default implementation of DatastoreService.
  - BlobInfoFactory
```
public BlobInfoFactory(DatastoreService datastoreService)
```
    Creates a BlobInfoFactory with the specified implementation of DatastoreService.
- Method Detail
  - loadBlobInfo
```
public @Nullable BlobInfo loadBlobInfo(BlobKey blobKey)
```
    Loads the BlobInfo metadata for blobKey. Returns null if no matching blob is found.
  - queryBlobInfos
```
public Iterator<BlobInfo> queryBlobInfos()
```
    Queries for BlobInfo instances, beginning with the BlobKey that appears first in lexicographic order.
  - queryBlobInfosAfter
```
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.
  - createBlobInfo
```
public BlobInfo createBlobInfo(Entity entity)
```
    Creates a BlobInfo by extracting content from the specified Entity.

Class BlobInfoFactory

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

KIND

CONTENT_TYPE

CREATION

FILENAME

SIZE

MD5_HASH

GS_OBJECT_NAME

Constructor Detail

BlobInfoFactory

BlobInfoFactory

Method Detail

loadBlobInfo

queryBlobInfos

queryBlobInfosAfter

createBlobInfo