ru.ilb.common.jaxrs.json.eclipse

Class MOXyJsonProvider

java.lang.Object

ru.ilb.common.jaxrs.json.eclipse.MOXyJsonProvider

All Implemented Interfaces:

javax.ws.rs.ext.MessageBodyReader<Object>, javax.ws.rs.ext.MessageBodyWriter<Object>

Direct Known Subclasses:

MOXyJsonProvider

@Produces(value={"application/json","*/*","application/x-javascript"})
 @Consumes(value={"application/json","*/*"})
public class MOXyJsonProvider
extends Object
implements javax.ws.rs.ext.MessageBodyReader<Object>, javax.ws.rs.ext.MessageBodyWriter<Object>

This is an implementation of MessageBodyReader/MessageBodyWriter that can be used to enable EclipseLink JAXB (MOXy) as the JSON provider.

Supported Media Type Patterns

• */json (i.e. application/json and text/json)
• */*+json

Below are some different usage options.

Option #1 - MOXyJsonProvider Default Behavior

You can use the Application class to specify that MOXyJsonProvider should be used with your JAX-RS application.

 package org.example;

 import java.util.*;
 import javax.ws.rs.core.Application;
 import org.eclipse.persistence.jaxb.rs.MOXyJsonProvider;

 public class ExampleApplication  extends Application {

     @Override
     public Set<Class<?>> getClasses() {
         HashSet<Class<?>> set = new HashSet<Class<?>>(2);
         set.add(MOXyJsonProvider.class);
         set.add(ExampleService.class);
         return set;
     }

 }
 

Option #2 - Customize MOXyJsonProvider

You can use the Application class to specify a configured instance of MOXyJsonProvider should be used with your JAX-RS application.

 package org.example;

 import java.util.*;
 import javax.ws.rs.core.Application;
 import org.eclipse.persistence.jaxb.rs.MOXyJsonProvider;

 public class CustomerApplication  extends Application {

     @Override
     public Set<Class<?>> getClasses() {
         HashSet<Class<?>> set = new HashSet<Class<?>>(1);
         set.add(ExampleService.class);
         return set;
     }

     @Override
     public Set<Object> getSingletons() {
         moxyJsonProvider moxyJsonProvider = new MOXyJsonProvider();
         moxyJsonProvider.setFormattedOutput(true);
         moxyJsonProvider.setIncludeRoot(true);

         HashSet<Object> set = new HashSet<Object>(2);
         set.add(moxyJsonProvider);
         return set;
     }

 } 
 

Option #3 - Extend MOXyJsonProvider

You can use MOXyJsonProvider for creating your own MessageBodyReader/MessageBodyWriter.

 package org.example;

 import java.lang.annotation.Annotation;
 import java.lang.reflect.Type;

 import javax.ws.rs.*;
 import javax.ws.rs.core.*;
 import javax.ws.rs.ext.Provider;
 import javax.xml.bind.*;

 import org.eclipse.persistence.jaxb.MarshallerProperties;
 import org.eclipse.persistence.jaxb.rs.MOXyJsonProvider;

 @Provider
 @Produces(MediaType.APPLICATION_JSON)
 @Consumes(MediaType.APPLICATION_JSON)
 public class CustomerJSONProvider extends MOXyJsonProvider {

     @Override
     public boolean isReadable(Class<?> type, Type genericType,
             Annotation[] annotations, MediaType mediaType) {
         return getDomainClass(genericType) == Customer.class;
     }

     @Override
     public boolean isWriteable(Class<?> type, Type genericType,
             Annotation[] annotations, MediaType mediaType) {
         return isReadable(type, genericType, annotations, mediaType);
     }

     @Override
     protected void preReadFrom(Class<Object> type, Type genericType,
             Annotation[] annotations, MediaType mediaType,
             MultivaluedMap<String, String> httpHeaders,
             Unmarshaller unmarshaller) throws JAXBException {
         unmarshaller.setProperty(MarshallerProperties.JSON_VALUE_WRAPPER, "$");
     }

     @Override
     protected void preWriteTo(Object object, Class<?> type, Type genericType,
             Annotation[] annotations, MediaType mediaType,
             MultivaluedMap<String, Object> httpHeaders, Marshaller marshaller)
             throws JAXBException {
         marshaller.setProperty(MarshallerProperties.JSON_VALUE_WRAPPER, "$");
     }

 }
 

Since:

2.4

Field Summary

Fields

Modifier and Type	Field and Description
protected javax.ws.rs.ext.Providers	providers

Constructor Summary

Constructors

Constructor and Description
MOXyJsonProvider()

Method Summary

Modifier and Type	Method and Description
String	getAttributePrefix() The value that will be prepended to all keys that are mapped to an XML attribute.
Class<?>	getDomainClass(Set<Class<?>> domainClasses) Get first non java class if exists.
protected Set<Class<?>>	getDomainClasses(Type genericType) A convenience method to get the domain class (i.e.
protected JAXBContext	getJAXBContext(Set<Class<?>> domainClasses, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType, javax.ws.rs.core.MultivaluedMap<String,?> httpHeaders) Return the JAXBContext that corresponds to the domain class.
Map<String,String>	getNamespacePrefixMapper() By default the JSON-binding will ignore namespace qualification.
char	getNamespaceSeparator() This character (default is '.') separates the prefix from the key name.
long	getSize(Object t, Class<?> type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType)
String	getValueWrapper() The key that will correspond to the property mapped with @XmlValue.
boolean	isFormattedOutput()
boolean	isIncludeRoot()
boolean	isMarshalEmptyCollections() If true empty collections will be marshalled as empty arrays, else the collection will not be marshalled to JSON (default is true).
boolean	isReadable(Class<?> type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType)
boolean	isWrapperAsArrayName() If true the grouping element will be used as the JSON key.
boolean	isWriteable(Class<?> type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType)
protected void	preReadFrom(Class<Object> type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType, javax.ws.rs.core.MultivaluedMap<String,String> httpHeaders, Unmarshaller unmarshaller) Subclasses of MOXyJsonProvider can override this method to customize the instance of Unmarshaller that will be used to unmarshal the JSON message in the readFrom call.
protected void	preWriteTo(Object object, Class<?> type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType, javax.ws.rs.core.MultivaluedMap<String,Object> httpHeaders, Marshaller marshaller) Subclasses of MOXyJsonProvider can override this method to customize the instance of Marshaller that will be used to marshal the domain objects to JSON in the writeTo call.
Object	readFrom(Class<Object> type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType, javax.ws.rs.core.MultivaluedMap<String,String> httpHeaders, InputStream entityStream)
void	setAttributePrefix(String attributePrefix) Specify a value that will be prepended to all keys that are mapped to an XML attribute.
void	setFormattedOutput(boolean formattedOutput) Specify if the JSON output should be formatted (default is false).
void	setIncludeRoot(boolean includeRoot) Specify if the root node should be included in the JSON message (default is false).
void	setMarshalEmptyCollections(boolean marshalEmptyCollections) If true empty collections will be marshalled as empty arrays, else the collection will not be marshalled to JSON (default is true).
void	setNamespacePrefixMapper(Map<String,String> namespacePrefixMapper) By default the JSON-binding will ignore namespace qualification.
void	setNamespaceSeparator(char namespaceSeparator) This character (default is '.') separates the prefix from the key name.
void	setValueWrapper(String valueWrapper) Specify the key that will correspond to the property mapped with @XmlValue.
void	setWrapperAsArrayName(boolean wrapperAsArrayName) If true the grouping element will be used as the JSON key.
protected boolean	supportsMediaType(javax.ws.rs.core.MediaType mediaType)
void	writeTo(Object object, Class<?> type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType, javax.ws.rs.core.MultivaluedMap<String,Object> httpHeaders, OutputStream entityStream)

Methods inherited from class java.lang.Object

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

Field Detail

providers

@Context
protected javax.ws.rs.ext.Providers providers

Constructor Detail

MOXyJsonProvider

public MOXyJsonProvider()

Method Detail

getAttributePrefix

public String getAttributePrefix()

The value that will be prepended to all keys that are mapped to an XML attribute. By default there is no attribute prefix.

See Also:

MarshallerProperties.JSON_ATTRIBUTE_PREFIX, UnmarshallerProperties.JSON_ATTRIBUTE_PREFIX

getDomainClasses

protected Set<Class<?>> getDomainClasses(Type genericType)

A convenience method to get the domain class (i.e. Customer or Foo, Bar) from the parameter/return type (i.e. Customer, List<Customer>, JAXBElement<Customer>, JAXBElement<? extends Customer>, List<JAXBElement<Customer>>, or List<JAXBElement<? extends Customer>> List<Foo<Bar>>).

Parameters:

genericType - - The parameter/return type of the JAX-RS operation.

Returns:

The corresponding domain classes.

getJAXBContext

protected JAXBContext getJAXBContext(Set<Class<?>> domainClasses,
                                     Annotation[] annotations,
                                     javax.ws.rs.core.MediaType mediaType,
                                     javax.ws.rs.core.MultivaluedMap<String,?> httpHeaders)
                              throws JAXBException

Return the JAXBContext that corresponds to the domain class. This method does the following:

1. If an EclipseLink JAXB (MOXy) JAXBContext is available from a ContextResolver then use it.
2. If an existing JAXBContext was not found in step one, then create a new one on the domain class.

Parameters:

domainClasses - - The domain classes we need a JAXBContext for.

annotations - - The annotations corresponding to domain object.

mediaType - - The media type for the HTTP entity.

httpHeaders - - HTTP headers associated with HTTP entity.

Returns:

Throws:

JAXBException

getNamespacePrefixMapper

public Map<String,String> getNamespacePrefixMapper()

By default the JSON-binding will ignore namespace qualification. If this property is set the portion of the key before the namespace separator will be used to determine the namespace URI.

See Also:

MarshallerProperties.NAMESPACE_PREFIX_MAPPER, UnmarshallerProperties.JSON_NAMESPACE_PREFIX_MAPPER

getNamespaceSeparator

public char getNamespaceSeparator()

This character (default is '.') separates the prefix from the key name. It is only used if namespace qualification has been enabled be setting a namespace prefix mapper.

See Also:

MarshallerProperties.JSON_NAMESPACE_SEPARATOR, UnmarshallerProperties.JSON_NAMESPACE_SEPARATOR

getSize

public long getSize(Object t,
                    Class<?> type,
                    Type genericType,
                    Annotation[] annotations,
                    javax.ws.rs.core.MediaType mediaType)

Specified by:

getSize in interface javax.ws.rs.ext.MessageBodyWriter<Object>

getValueWrapper

public String getValueWrapper()

The key that will correspond to the property mapped with @XmlValue. This key will only be used if there are other mapped properties.

See Also:

MarshallerProperties.JSON_VALUE_WRAPPER, UnmarshallerProperties.JSON_VALUE_WRAPPER

isFormattedOutput

public boolean isFormattedOutput()

Returns:

true if the JSON output should be formatted (default is false).

isIncludeRoot

public boolean isIncludeRoot()

Returns:

true if the root node is included in the JSON message (default is false).

See Also:

MarshallerProperties.JSON_INCLUDE_ROOT, UnmarshallerProperties.JSON_INCLUDE_ROOT

isMarshalEmptyCollections

public boolean isMarshalEmptyCollections()

If true empty collections will be marshalled as empty arrays, else the collection will not be marshalled to JSON (default is true).

See Also:

MarshallerProperties.JSON_MARSHAL_EMPTY_COLLECTIONS

isReadable

public boolean isReadable(Class<?> type,
                          Type genericType,
                          Annotation[] annotations,
                          javax.ws.rs.core.MediaType mediaType)

Specified by:

isReadable in interface javax.ws.rs.ext.MessageBodyReader<Object>

Returns:

true indicating that MOXyJsonProvider will be used for the JSON binding if the media type is of the following patterns */json or */*+json, and the type is not assignable from any of (or a Collection or JAXBElement of) the following:

• byte[]
• java.io.File
• java.io.InputStream
• java.io.Reader
• java.lang.Object
• java.lang.String
• javax.activation.DataSource

isWrapperAsArrayName

public boolean isWrapperAsArrayName()

If true the grouping element will be used as the JSON key.

Example

Given the following class:

 @XmlAccessorType(XmlAccessType.FIELD)
 public class Customer {
 
     @XmlElementWrapper(name="phone-numbers")
     @XmlElement(name="phone-number")
     private  List<PhoneNumber> phoneNumbers;
 
 }
 

If the property is set to false (the default) the JSON output will be:

 {
     "phone-numbers" : {
         "phone-number" : [ {
             ...
         }, {
             ...
         }]
     }
 }
 

And if the property is set to true, then the JSON output will be:

 {
     "phone-numbers" : [ {
         ...
     }, {
         ...
     }]
 }
 

Since:

2.4.2

See Also:

JAXBContextProperties.JSON_WRAPPER_AS_ARRAY_NAME, MarshallerProperties.JSON_WRAPPER_AS_ARRAY_NAME, UnmarshallerProperties.JSON_WRAPPER_AS_ARRAY_NAME

isWriteable

public boolean isWriteable(Class<?> type,
                           Type genericType,
                           Annotation[] annotations,
                           javax.ws.rs.core.MediaType mediaType)

Specified by:

isWriteable in interface javax.ws.rs.ext.MessageBodyWriter<Object>

Returns:

true indicating that MOXyJsonProvider will be used for the JSON binding if the media type is of the following patterns */json or */*+json, and the type is not assignable from any of (or a Collection or JAXBElement of) the following:

• byte[]
• java.io.File
• java.lang.Object
• java.lang.String
• javax.activation.DataSource
• javax.ws.rs.core.StreamingOutput

preReadFrom

protected void preReadFrom(Class<Object> type,
                           Type genericType,
                           Annotation[] annotations,
                           javax.ws.rs.core.MediaType mediaType,
                           javax.ws.rs.core.MultivaluedMap<String,String> httpHeaders,
                           Unmarshaller unmarshaller)
                    throws JAXBException

Subclasses of MOXyJsonProvider can override this method to customize the instance of Unmarshaller that will be used to unmarshal the JSON message in the readFrom call.

Parameters:

type - - The Class to be unmarshalled (i.e. Customer or List)

genericType - - The type of object to be unmarshalled (i.e Customer or List<Customer>).

annotations - - The annotations corresponding to domain object.

mediaType - - The media type for the HTTP entity.

httpHeaders - - HTTP headers associated with HTTP entity.

unmarshaller - - The instance of Unmarshaller that will be used to unmarshal the JSON message.

Throws:

JAXBException

See Also:

UnmarshallerProperties

preWriteTo

protected void preWriteTo(Object object,
                          Class<?> type,
                          Type genericType,
                          Annotation[] annotations,
                          javax.ws.rs.core.MediaType mediaType,
                          javax.ws.rs.core.MultivaluedMap<String,Object> httpHeaders,
                          Marshaller marshaller)
                   throws JAXBException

Subclasses of MOXyJsonProvider can override this method to customize the instance of Marshaller that will be used to marshal the domain objects to JSON in the writeTo call.

Parameters:

object - - The domain object that will be marshalled to JSON.

type - - The Class to be marshalled (i.e. Customer or List)

genericType - - The type of object to be marshalled (i.e Customer or List<Customer>).

annotations - - The annotations corresponding to domain object.

mediaType - - The media type for the HTTP entity.

httpHeaders - - HTTP headers associated with HTTP entity.

marshaller - - The instance of Marshaller that will be used to marshal the domain object to JSON.

Throws:

JAXBException

See Also:

MarshallerProperties

readFrom

public Object readFrom(Class<Object> type,
                       Type genericType,
                       Annotation[] annotations,
                       javax.ws.rs.core.MediaType mediaType,
                       javax.ws.rs.core.MultivaluedMap<String,String> httpHeaders,
                       InputStream entityStream)
                throws IOException,
                       javax.ws.rs.WebApplicationException

Specified by:

readFrom in interface javax.ws.rs.ext.MessageBodyReader<Object>

Throws:

IOException

javax.ws.rs.WebApplicationException

getDomainClass

public Class<?> getDomainClass(Set<Class<?>> domainClasses)

Get first non java class if exists.

Parameters:

domainClasses -

Returns:

first domain class or first generic class or just the first class from the list

setAttributePrefix

public void setAttributePrefix(String attributePrefix)

Specify a value that will be prepended to all keys that are mapped to an XML attribute. By default there is no attribute prefix.

See Also:

MarshallerProperties.JSON_ATTRIBUTE_PREFIX, UnmarshallerProperties.JSON_ATTRIBUTE_PREFIX

setFormattedOutput

public void setFormattedOutput(boolean formattedOutput)

Specify if the JSON output should be formatted (default is false).

Parameters:

formattedOutput - - true if the output should be formatted, else false.

setIncludeRoot

public void setIncludeRoot(boolean includeRoot)

Specify if the root node should be included in the JSON message (default is false).

Parameters:

includeRoot - - true if the message includes the root node, else false.

See Also:

MarshallerProperties.JSON_INCLUDE_ROOT, UnmarshallerProperties.JSON_INCLUDE_ROOT

setMarshalEmptyCollections

public void setMarshalEmptyCollections(boolean marshalEmptyCollections)

If true empty collections will be marshalled as empty arrays, else the collection will not be marshalled to JSON (default is true).

See Also:

MarshallerProperties.JSON_MARSHAL_EMPTY_COLLECTIONS

setNamespacePrefixMapper

public void setNamespacePrefixMapper(Map<String,String> namespacePrefixMapper)

By default the JSON-binding will ignore namespace qualification. If this property is set then a prefix corresponding to the namespace URI and a namespace separator will be prefixed to the key. include it you can specify a Map of namespace URI to prefix.

See Also:

MarshallerProperties.NAMESPACE_PREFIX_MAPPER, UnmarshallerProperties.JSON_NAMESPACE_PREFIX_MAPPER

setNamespaceSeparator

public void setNamespaceSeparator(char namespaceSeparator)

This character (default is '.') separates the prefix from the key name. It is only used if namespace qualification has been enabled be setting a namespace prefix mapper.

See Also:

MarshallerProperties.JSON_NAMESPACE_SEPARATOR, UnmarshallerProperties.JSON_NAMESPACE_SEPARATOR

setWrapperAsArrayName

public void setWrapperAsArrayName(boolean wrapperAsArrayName)

If true the grouping element will be used as the JSON key.

Example

Given the following class:

 @XmlAccessorType(XmlAccessType.FIELD)
 public class Customer {
 
     @XmlElementWrapper(name="phone-numbers")
     @XmlElement(name="phone-number")
     private  List<PhoneNumber> phoneNumbers;
 
 }
 

If the property is set to false (the default) the JSON output will be:

 {
     "phone-numbers" : {
         "phone-number" : [ {
             ...
         }, {
             ...
         }]
     }
 }
 

And if the property is set to true, then the JSON output will be:

 {
     "phone-numbers" : [ {
         ...
     }, {
         ...
     }]
 }
 

Since:

2.4.2

See Also:

JAXBContextProperties.JSON_WRAPPER_AS_ARRAY_NAME, MarshallerProperties.JSON_WRAPPER_AS_ARRAY_NAME, UnmarshallerProperties.JSON_WRAPPER_AS_ARRAY_NAME

setValueWrapper

public void setValueWrapper(String valueWrapper)

Specify the key that will correspond to the property mapped with @XmlValue. This key will only be used if there are other mapped properties.

See Also:

MarshallerProperties.JSON_VALUE_WRAPPER, UnmarshallerProperties.JSON_VALUE_WRAPPER

supportsMediaType

protected boolean supportsMediaType(javax.ws.rs.core.MediaType mediaType)

Returns:

true for all media types of the pattern */json and */*+json.

writeTo

public void writeTo(Object object,
                    Class<?> type,
                    Type genericType,
                    Annotation[] annotations,
                    javax.ws.rs.core.MediaType mediaType,
                    javax.ws.rs.core.MultivaluedMap<String,Object> httpHeaders,
                    OutputStream entityStream)
             throws IOException,
                    javax.ws.rs.WebApplicationException

Specified by:

writeTo in interface javax.ws.rs.ext.MessageBodyWriter<Object>

Throws:

IOException

javax.ws.rs.WebApplicationException

See Also:

MessageBodyWriter.writeTo(java.lang.Object, java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap, java.io.OutputStream)