Package de.xima.fc.dao.interfaces

Interface IGenericFileDao

All Known Implementing Classes:

GenericFileDao

public interface IGenericFileDao

Data access object working for different kinds of entities that provide binary file content.

Since:

8.0.0

Author:

XIMA MEDIA GmbH

Method Summary

Modifier and Type	Method	Description
<D extends IFileDataEntity<F>,F extends IKeyDependentFileEntity<E,D>,E extends IFileMapProviding<F,D>> byte[]	getFileData(IEntityContext ec, E entity, String fileKey)	Returns the file data of a file belonging to the given entity with the given file key.
<E extends IFileDataEntity<?>,T extends IFileProviding<?,E>> byte[]	getFileData(IEntityContext ec, Class<T> entityClass, long id)	Returns the file data of a file entity.
<E extends IFileDataEntity<?>,T extends IFileProviding<?,E>> byte[]	getFileData(IEntityContext ec, T entity)	Returns the file data of a file entity.
<D extends IFileDataEntity<F>,F extends IKeyDependentFileEntity<E,D>,E extends IFileMapProviding<F,D>> D	getFileDataEntity(IEntityContext ec, E entity, String fileKey)	Returns the file data entity of a file belonging to the given entity with the given file key.
<E extends IFileDataEntity<?>,T extends IFileEntity<?,E>> E	getFileDataEntity(IEntityContext ec, T entity)	Get the file data entity for a given file entity.
<T extends IFileEntity<?,?>> byte[]	getFileEntityData(IEntityContext ec, T fileEntity)	Gets the data of the given file entity as an in-memory byte array.
<T extends IFileEntity<?,?>> InputStream	getFileEntityStream(IEntityContext ec, T fileEntity)	Gets the data of the given file entity as an input stream.
<D extends IFileDataEntity<F>,F extends IKeyDependentFileEntity<E,D>,E extends IFileMapProviding<F,D>> InputStream	getFileStream(IEntityContext ec, E entity, String fileKey)	Returns the file data of a file belonging to the given entity with the given file key, as an input stream.
<E extends IFileDataEntity<?>,T extends IFileProviding<?,E>> InputStream	getFileStream(IEntityContext ec, T entity)
<E extends IFileDataEntity<?>,T extends IFileEntity<?,E>> T	updateFileData(IEntityContext ec, T entity, byte[] data)	Replaces the data of the given file entity with the new data.

Method Detail

getFileData

<E extends IFileDataEntity<?>,T extends IFileProviding<?,E>> byte[] getFileData(IEntityContext ec,
                                                                                            Class<T> entityClass,
                                                                                            long id)

Returns the file data of a file entity.

Use with care! As the name suggests, this holds the entire file data in memory. Prefer using an input stream instead.

Type Parameters:

E - Type of the entity with the file data.

T - Type of the entity with the file meta data.

Parameters:

ec - Entity context for database transactions.

entityClass - Type of the file entity with the file meta data.

id - ID of the file entity with the file meta data.

Returns:

The file content as a byte array, or null when no file content was found.

getFileData

<E extends IFileDataEntity<?>,T extends IFileProviding<?,E>> byte[] getFileData(IEntityContext ec,
                                                                                            T entity)

Returns the file data of a file entity.

Use with care! As the name suggests, this holds the entire file data in memory. Prefer using an input stream instead.

Type Parameters:

E - Type of the entity with the file data.

T - Type of the entity with the file meta data.

Parameters:

ec - Entity context for database transactions.

entity - File entity with the file meta data.

Returns:

The file content as a byte array.

getFileData

<D extends IFileDataEntity<F>,F extends IKeyDependentFileEntity<E,D>,E extends IFileMapProviding<F,D>> byte[] getFileData(IEntityContext ec,
                                                                                                                                                  E entity,
                                                                                                                                                  String fileKey)

Returns the file data of a file belonging to the given entity with the given file key.

Use with care! As the name suggests, this holds the entire file data in memory. Prefer using an input stream instead.

Type Parameters:

E - file map providing base entity type

D - file data entity type

F - file entity type

Parameters:

ec - entity context for database transactions.

entity - that owns the file

fileKey - Key identifying the the file to retrieve.

Returns:

The file data as a byte array.

Since:

7.1.0

getFileStream

<D extends IFileDataEntity<F>,F extends IKeyDependentFileEntity<E,D>,E extends IFileMapProviding<F,D>> InputStream getFileStream(IEntityContext ec,
                                                                                                                                                         E entity,
                                                                                                                                                         String fileKey)

Returns the file data of a file belonging to the given entity with the given file key, as an input stream.

Type Parameters:

E - file map providing base entity type

D - file data entity type

F - file entity type

Parameters:

ec - entity context for database transactions.

entity - that owns the file

fileKey - Key identifying the the file to retrieve.

Returns:

The file data as an input stream.

Since:

8.0.0

updateFileData

<E extends IFileDataEntity<?>,T extends IFileEntity<?,E>> T updateFileData(IEntityContext ec,
                                                                                       T entity,
                                                                                       byte[] data)

Replaces the data of the given file entity with the new data.

Type Parameters:

E - Type of the entity with the file data.

T - Type of the entity with the file meta data.

Parameters:

ec - Entity context for database transactions.

entity - File entity with the file meta data.

data - New data to set.

Returns:

The updated file entity.

getFileDataEntity

<E extends IFileDataEntity<?>,T extends IFileEntity<?,E>> E getFileDataEntity(IEntityContext ec,
                                                                                          T entity)

Get the file data entity for a given file entity. The entity is read from the database if it is detached.

Type Parameters:

E - Type of the entity with the file data.

T - Type of the entity with the file meta data.

Parameters:

ec - Entity context for database transactions.

entity - File entity with the file meta data.

Returns:

The file data entity for the given file entity.

getFileDataEntity

<D extends IFileDataEntity<F>,F extends IKeyDependentFileEntity<E,D>,E extends IFileMapProviding<F,D>> D getFileDataEntity(IEntityContext ec,
                                                                                                                                                   E entity,
                                                                                                                                                   String fileKey)

Returns the file data entity of a file belonging to the given entity with the given file key.

Type Parameters:

E - file map providing base entity type

D - file data entity type

F - file entity type

Parameters:

ec - Entity context for database transactions.

entity - that owns the file

fileKey - key identifying the the file entity

Returns:

file data entity containing the data of the request file.

Since:

8.0.0

getFileStream

<E extends IFileDataEntity<?>,T extends IFileProviding<?,E>> InputStream getFileStream(IEntityContext ec,
                                                                                                   T entity)

Type Parameters:

E - Type of the entity with the file data.

T - Type of the entity with the file meta data.

Parameters:

ec - Entity context for database transactions.

entity - File entity with the file meta data.

Returns:

The data of the file entity as an input stream, or null when no data exists.

getFileEntityData

<T extends IFileEntity<?,?>> byte[] getFileEntityData(IEntityContext ec,
                                                            T fileEntity)

Gets the data of the given file entity as an in-memory byte array.

Use with care! As the name suggests, this holds the entire file data in memory. Prefer using an input stream instead.

Type Parameters:

T - Type of the file entity with the data.

Parameters:

ec - Entity context for database transactions.

fileEntity - File entity with the data.

Returns:

The data as a byte array, or null if no data exists.

getFileEntityStream

<T extends IFileEntity<?,?>> InputStream getFileEntityStream(IEntityContext ec,
                                                                   T fileEntity)

Gets the data of the given file entity as an input stream.

Parameters:

ec - Entity context for database transactions.

fileEntity - File entity with the data.

Returns:

The data as an input stream, or null if no data exists.

Since:

8.0.0