org.restlet.engine.converter
Class ConverterHelper

java.lang.Object
  org.restlet.engine.Helper
      org.restlet.engine.converter.ConverterHelper

Direct Known Subclasses:

DefaultConverter

public abstract class ConverterHelper
extends Helper

Converter between Representations and regular Java objects.

Author:

Jerome Louvel

Constructor Summary

ConverterHelper()

Method Summary

protected List<Class<?>>	addObjectClass(List<Class<?>> objectClasses, Class<?> objectClass) Adds an object class to the given list.
protected List<VariantInfo>	addVariant(List<VariantInfo> variants, VariantInfo userVariant) Adds a variant to the given list.
List<VariantInfo>	addVariants(Class<?> sourceClass, Variant targetVariant, List<VariantInfo> variants) Returns the list of variants that can be converted from a given object class.
abstract List<Class<?>>	getObjectClasses(Variant source) Returns the list of object classes that can be converted from a given variant.
abstract List<VariantInfo>	getVariants(Class<?> source) Returns the list of variants that can be converted from a given object class.
List<VariantInfo>	getVariants(Class<?> sourceClass, Variant targetVariant) Returns the list of variants that can be converted from a given object class by a specific converter helper.
abstract float	score(Object source, Variant target, Resource resource) Scores the affinity of this helper with the source class.
abstract <T> float	score(Representation source, Class<T> target, Resource resource) Scores the affinity of this helper with the source class.
abstract <T> T	toObject(Representation source, Class<T> target, Resource resource) Converts a Representation into a regular Java object.
abstract Representation	toRepresentation(Object source, Variant target, Resource resource) Converts a regular Java object into a Representation.
<T> void	updatePreferences(List<Preference<MediaType>> preferences, Class<T> entity) Updates the preferences of the given ClientInfo object with conversion capabilities for the given entity class.
void	updatePreferences(List<Preference<MediaType>> preferences, MediaType mediaType, float score) Updates the preferences of the given ClientInfo object with conversion capabilities for the given entity class.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConverterHelper

public ConverterHelper()

Method Detail

addObjectClass

protected List<Class<?>> addObjectClass(List<Class<?>> objectClasses,
                                        Class<?> objectClass)

Adds an object class to the given list. Creates a new list if necessary.

Parameters:

objectClasses - The object classes list to update or null.

objectClass - The object class to add.

Returns:

The input object classes list or a new one.

addVariant

protected List<VariantInfo> addVariant(List<VariantInfo> variants,
                                       VariantInfo userVariant)

Adds a variant to the given list. Creates a new list if necessary.

Parameters:

variants - The variants list to update or null.

userVariant - The variant to add if not null.

Returns:

The input variants list or a new one.

addVariants

public List<VariantInfo> addVariants(Class<?> sourceClass,
                                     Variant targetVariant,
                                     List<VariantInfo> variants)
                              throws IOException

Returns the list of variants that can be converted from a given object class.

Parameters:

sourceClass - The source class.

targetVariant - The expected representation metadata.

variants - The variants list to update.

Throws:

IOException

getObjectClasses

public abstract List<Class<?>> getObjectClasses(Variant source)

Returns the list of object classes that can be converted from a given variant.

Parameters:

source - The source variant.

Returns:

The list of object class that can be converted.

getVariants

public abstract List<VariantInfo> getVariants(Class<?> source)
                                       throws IOException

Returns the list of variants that can be converted from a given object class. The preferred variant should be set in first position.

Parameters:

source - The source object class.

Returns:

The list of variants that can be converted.

Throws:

IOException

getVariants

public List<VariantInfo> getVariants(Class<?> sourceClass,
                                     Variant targetVariant)
                              throws IOException

Returns the list of variants that can be converted from a given object class by a specific converter helper.

Parameters:

sourceClass - The source class.

targetVariant - The expected representation metadata.

Returns:

The list of variants that can be converted.

Throws:

IOException

score

public abstract float score(Object source,
                            Variant target,
                            Resource resource)

Scores the affinity of this helper with the source class.

Parameters:

source - The source object to convert.

target - The expected representation metadata.

resource - The calling resource.

Returns:

The affinity score of this helper.

score

public abstract <T> float score(Representation source,
                                Class<T> target,
                                Resource resource)

Scores the affinity of this helper with the source class.

Parameters:

source - The source representation to convert.

target - The expected class of the Java object.

resource - The calling resource.

Returns:

The affinity score of this helper.

toObject

public abstract <T> T toObject(Representation source,
                               Class<T> target,
                               Resource resource)
                    throws IOException

Converts a Representation into a regular Java object.

Type Parameters:

T - The expected class of the Java object.

Parameters:

source - The source representation to convert.

target - The expected class of the Java object.

resource - The calling resource.

Returns:

The converted Java object.

Throws:

IOException

toRepresentation

public abstract Representation toRepresentation(Object source,
                                                Variant target,
                                                Resource resource)
                                         throws IOException

Converts a regular Java object into a Representation.

Parameters:

source - The source object to convert.

target - The expected representation metadata.

resource - The calling resource.

Returns:

The converted representation.

Throws:

IOException

updatePreferences

public <T> void updatePreferences(List<Preference<MediaType>> preferences,
                                  Class<T> entity)

Updates the preferences of the given ClientInfo object with conversion capabilities for the given entity class.

Parameters:

preferences - The media type preferences.

entity - The entity class to convert.

updatePreferences

public void updatePreferences(List<Preference<MediaType>> preferences,
                              MediaType mediaType,
                              float score)

Updates the preferences of the given ClientInfo object with conversion capabilities for the given entity class.

Parameters:

preferences - The media type preferences.

mediaType - The media type to update to add to the preferences.

score - The media type score to use as a quality score.