com.liferay.document.library.kernel.util

Interface DLProcessor

All Known Implementing Classes:

DLPreviewableProcessor

public interface DLProcessor

Provides a common interface for all the processors of the document library. All document library processors must implement this interface. A DLProcessor (processor) is responsible for extracting additional metadata or assets from a Documents and Media file entry. Here are a couple examples of such metadata and assets:

• Metadata stored in JPEG images or video files.
• Images to use as previews for PDF or Word documents.

Processors can be defined as OSGi components. To do that, annotate your processor and register it under the type DLProcessor:

  @Component(service = DLProcessor.class)
 public class MyDLProcessor implements DLProcessor {

 }
 

Implementing classes are responsible for managing any storage required by the generated resources and for providing access to any generated assets. See current implementations for examples.

Author:

Alexander Chow, Mika Koivisto

See Also:

AudioProcessor, DLPreviewableProcessor, ImageProcessor, PDFProcessor, RawMetadataProcessor, VideoProcessor

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet()
void	cleanUp(FileEntry fileEntry) Cleans up any resources that the processor created for the file entry.
void	cleanUp(FileVersion fileVersion) Cleans up any resources that the processor created for the given file version.
void	copy(FileVersion sourceFileVersion, FileVersion destinationFileVersion) Copies all resources generated for the source file version, reusing them for destination file version.
default void	destroy()
void	exportGeneratedFiles(PortletDataContext portletDataContext, FileEntry fileEntry, Element fileEntryElement) Exports any resources generated for the file entry into file entry element.
String	getType() Returns the processor's type.
void	importGeneratedFiles(PortletDataContext portletDataContext, FileEntry fileEntry, FileEntry importedFileEntry, Element fileEntryElement) Imports any existing resources from the file entry or file entry element.
boolean	isSupported(FileVersion fileVersion) Returns true if the file version is supported by this processor.
boolean	isSupported(String mimeType) Returns true if the given file MIME type is supported by this processor.
void	trigger(FileVersion sourceFileVersion, FileVersion destinationFileVersion) Launches the processor's work with respect to the destination file version.

Method Detail

afterPropertiesSet

void afterPropertiesSet()
                 throws Exception

Throws:

Exception

cleanUp

void cleanUp(FileEntry fileEntry)

Cleans up any resources that the processor created for the file entry. Note that all resources for all file versions of this file entry are permanently deleted.

Parameters:

fileEntry - the file entry for which resources are cleaned up

cleanUp

void cleanUp(FileVersion fileVersion)

Cleans up any resources that the processor created for the given file version. Note that other resources associated with other file versions for the same file entry aren't affected; use cleanUp(FileEntry) if you want to clean up everything.

Parameters:

fileVersion - the file version for which resources will be cleaned up

copy

void copy(FileVersion sourceFileVersion,
          FileVersion destinationFileVersion)

Copies all resources generated for the source file version, reusing them for destination file version. Note that resources are literally copied, making the resulting resources independent (i.e., if afterwards the source file version is deleted, the destination file version resources aren't affected).

Parameters:

sourceFileVersion - the file version to copy resources from

destinationFileVersion - the file version to copy resources to

destroy

default void destroy()
              throws Exception

Throws:

Exception

exportGeneratedFiles

void exportGeneratedFiles(PortletDataContext portletDataContext,
                          FileEntry fileEntry,
                          Element fileEntryElement)
                   throws Exception

Exports any resources generated for the file entry into file entry element.

Parameters:

portletDataContext - the portlet data context to use during this export operation

fileEntry - the file entry for which resources are exported

fileEntryElement - the file entry element to save resources into

Throws:

Exception - if an error occurred while exporting the file entry resources

getType

String getType()

Returns the processor's type. See com.liferay.portlet.documentlibrary.model.DLProcessorConstants for the set of predefined processor types.

Returns:

the type of this processor

importGeneratedFiles

void importGeneratedFiles(PortletDataContext portletDataContext,
                          FileEntry fileEntry,
                          FileEntry importedFileEntry,
                          Element fileEntryElement)
                   throws Exception

Imports any existing resources from the file entry or file entry element. If the portlet data context supports direct binary import (see PortletDataContext.isPerformDirectBinaryImport()), the resources are directly copied from the file entry; otherwise, they're extracted from the file entry element.

Parameters:

portletDataContext - the portlet data context to use during this import operation

fileEntry - the file entry to import resources from, if direct binary import is supported

importedFileEntry - the file entry for which resources are imported

fileEntryElement - the file entry element to import resources from, if direct binary import is not supported

Throws:

Exception - if an error occurred while importing the file entry resources

isSupported

boolean isSupported(FileVersion fileVersion)

Returns true if the file version is supported by this processor.

Parameters:

fileVersion - the file version

Returns:

true if this processor supports the file version; false otherwise

isSupported

boolean isSupported(String mimeType)

Returns true if the given file MIME type is supported by this processor.

Parameters:

mimeType - the MIME type

Returns:

true if this processor supports the MIME type; false otherwise

trigger

void trigger(FileVersion sourceFileVersion,
             FileVersion destinationFileVersion)

Launches the processor's work with respect to the destination file version.

Parameters:

sourceFileVersion - the file version to copy previews and thumbnails from (optionally null)

destinationFileVersion - the latest file version to process