org.alfresco.repo.content.transform

Class FailoverContentTransformer

java.lang.Object

org.alfresco.repo.content.transform.ContentTransformerHelper

org.alfresco.repo.content.transform.AbstractContentTransformerLimits

org.alfresco.repo.content.transform.AbstractContentTransformer2

org.alfresco.repo.content.transform.FailoverContentTransformer

All Implemented Interfaces:

ContentWorker, ContentTransformer, org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanNameAware, org.springframework.beans.factory.InitializingBean

@AlfrescoPublicApi
public class FailoverContentTransformer
extends AbstractContentTransformer2
implements org.springframework.beans.factory.InitializingBean

This class is a transformer which contains a fixed sequence of delegate transformers. Requests to transform a document will be passed to the first transformer in the sequence. If that transformer successfully transforms the document then the process is complete. However should it fail, the transformation will be passed on to the next transformer in the sequence and so on.

Transformers are considered to have failed of they throw an exception.

Author:

Neil McErlean

Field Summary

Fields inherited from class org.alfresco.repo.content.transform.AbstractContentTransformerLimits

transformerDebug

Fields inherited from class org.alfresco.repo.content.transform.ContentTransformerHelper

transformerConfig

Constructor Summary

Constructors

Constructor and Description
FailoverContentTransformer()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Ensures that required properties have been set
String	getComments(boolean available) Returns the transformer properties predefined (hard coded or implied) by this transformer.
boolean	isExplicitTransformation(String sourceMimetype, String targetMimetype, TransformationOptions options)
boolean	isTransformable(String sourceMimetype, long sourceSize, String targetMimetype, TransformationOptions options) Overrides super class method to avoid calling isTransformableMimetype(String, String, TransformationOptions) twice on each transformer in the list, as isTransformableSize(String, long, String, TransformationOptions) in this class must check the mimetype too.
boolean	isTransformableMimetype(String sourceMimetype, String targetMimetype, TransformationOptions options) Indicates if this transformer is able to transform the given source mimetype to the target mimetype.
boolean	isTransformableSize(String sourceMimetype, long sourceSize, String targetMimetype, TransformationOptions options) Indicates if this transformer is able to transform the given sourceSize.
void	setTransformers(List<ContentTransformer> transformers) The list of transformers to use.
void	transformInternal(org.alfresco.service.cmr.repository.ContentReader reader, org.alfresco.service.cmr.repository.ContentWriter writer, TransformationOptions options) Method to be implemented by subclasses wishing to make use of the common infrastructural code provided by this class.

Methods inherited from class org.alfresco.repo.content.transform.AbstractContentTransformer2

checkTransformable, getExecutorService, getRetryTransformOnDifferentMimeType, getStrictMimeTypeCheck, getTransformationTime, getTransformationTime, isTransformationLimitedInternally, recordError, recordTime, recordTime, register, setAdditionalThreadTimout, setExecutorService, setRegisterTransformer, setRegistry, setRetryTransformOnDifferentMimeType, setStrictMimeTypeCheck, setUseTimeoutThread, toString, transform, transform, transform

Methods inherited from class org.alfresco.repo.content.transform.AbstractContentTransformerLimits

getLimits, getLimits, getLimits, getMaxPages, getMaxSourceSizeKBytes, getMaxSourceSizeKBytes, getPageLimit, getReadLimitKBytes, getReadLimitTimeMs, getTimeoutMs, isPageLimitSupported, isTransformable, setLimits, setMaxPages, setMaxSourceSizeKBytes, setMimetypeLimits, setPageLimit, setPageLimitsSupported, setReaderLimits, setReadLimitKBytes, setReadLimitTimeMs, setTimeoutMs, setTransformerDebug

Methods inherited from class org.alfresco.repo.content.transform.ContentTransformerHelper

deprecatedSetter, equals, getBeanName, getCommentsOnlySupports, getExtensionOrAny, getMimetype, getMimetypeService, getName, getSimpleName, hashCode, isSupportedTransformation, onlySupports, setBeanName, setExplicitTransformations, setMimetypeService, setSupportedTransformations, setTransformerConfig, setUnsupportedTransformations

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.alfresco.repo.content.transform.ContentTransformer

getName

Constructor Detail

FailoverContentTransformer

public FailoverContentTransformer()

Method Detail

setTransformers

public void setTransformers(List<ContentTransformer> transformers)

The list of transformers to use. There must be at least one, but for failover behaviour to work there should be at least two.

Parameters:

transformers - list of transformers.

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Ensures that required properties have been set

Specified by:

afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean

Throws:

Exception

isTransformable

public boolean isTransformable(String sourceMimetype,
                               long sourceSize,
                               String targetMimetype,
                               TransformationOptions options)

Overrides super class method to avoid calling isTransformableMimetype(String, String, TransformationOptions) twice on each transformer in the list, as isTransformableSize(String, long, String, TransformationOptions) in this class must check the mimetype too.

Specified by:

isTransformable in interface ContentTransformer

Overrides:

isTransformable in class AbstractContentTransformerLimits

Parameters:

sourceMimetype - the source mimetype

sourceSize - the size (bytes) of the source. If negative it is unknown.

targetMimetype - the target mimetype

options - the transformation options

Returns:

boolean true if this content transformer can satify the mimetypes and options specified, false otherwise

isTransformableMimetype

public boolean isTransformableMimetype(String sourceMimetype,
                                       String targetMimetype,
                                       TransformationOptions options)

Description copied from class: AbstractContentTransformerLimits

Indicates if this transformer is able to transform the given source mimetype to the target mimetype. If overridden, consider also overriding ContentTransformerHelper.getComments(boolean).

Specified by:

isTransformableMimetype in interface ContentTransformer

Overrides:

isTransformableMimetype in class AbstractContentTransformerLimits

Parameters:

sourceMimetype - the source mimetype

targetMimetype - the target mimetype

options - the transformation options

Returns:

boolean true if this content transformer can satify the mimetypes, false otherwise

isTransformableSize

public boolean isTransformableSize(String sourceMimetype,
                                   long sourceSize,
                                   String targetMimetype,
                                   TransformationOptions options)

Description copied from class: AbstractContentTransformerLimits

Indicates if this transformer is able to transform the given sourceSize. The maxSourceSizeKBytes property may indicate that only small source files may be transformed.

Specified by:

isTransformableSize in interface ContentTransformer

Overrides:

isTransformableSize in class AbstractContentTransformerLimits

Parameters:

sourceMimetype - the source mimetype

sourceSize - size in bytes of the source. If negative, the source size is unknown.

targetMimetype - the target mimetype

options - the transformation options

Returns:

true if the source is transformable.

isExplicitTransformation

public boolean isExplicitTransformation(String sourceMimetype,
                                        String targetMimetype,
                                        TransformationOptions options)

Specified by:

isExplicitTransformation in interface ContentTransformer

Overrides:

isExplicitTransformation in class ContentTransformerHelper

Parameters:

sourceMimetype - the source mimetype

targetMimetype - the target mimetype

options - the transformation options

Returns:

boolean true if it is an explicit transformation, false otherwise

See Also:

ContentTransformer.isExplicitTransformation(java.lang.String, java.lang.String, org.alfresco.service.cmr.repository.TransformationOptions)

transformInternal

public void transformInternal(org.alfresco.service.cmr.repository.ContentReader reader,
                              org.alfresco.service.cmr.repository.ContentWriter writer,
                              TransformationOptions options)
                       throws Exception

Description copied from class: AbstractContentTransformer2

Method to be implemented by subclasses wishing to make use of the common infrastructural code provided by this class.

Specified by:

transformInternal in class AbstractContentTransformer2

Parameters:

reader - the source of the content to transform

writer - the target to which to write the transformed content

options - a map of options to use when performing the transformation. The map will never be null.

Throws:

Exception - exceptions will be handled by this class - subclasses can throw anything

See Also:

AbstractContentTransformer2.transformInternal(org.alfresco.service.cmr.repository.ContentReader, org.alfresco.service.cmr.repository.ContentWriter, org.alfresco.service.cmr.repository.TransformationOptions)

getComments

public String getComments(boolean available)

Returns the transformer properties predefined (hard coded or implied) by this transformer.

Specified by:

getComments in interface ContentTransformer

Overrides:

getComments in class ContentTransformerHelper

Parameters:

available - indicates if the transformer has been registered and is available to be selected. false indicates that the transformer is only available as a component of a complex transformer.

Returns:

one line per property. The simple transformer name is returned by default as a comment.