org.apache.olingo.server.api.serializer.ODataSerializer Java Examples

@Override
public ODataSerializer createSerializer(final ContentType contentType) throws SerializerException {
  ODataSerializer serializer = null;

  if (contentType != null && contentType.isCompatible(ContentType.APPLICATION_JSON)) {
    final String metadata = contentType.getParameter(ContentType.PARAMETER_ODATA_METADATA);
    if (metadata == null
        || ContentType.VALUE_ODATA_METADATA_MINIMAL.equalsIgnoreCase(metadata)
        || ContentType.VALUE_ODATA_METADATA_NONE.equalsIgnoreCase(metadata)
        || ContentType.VALUE_ODATA_METADATA_FULL.equalsIgnoreCase(metadata)) {
      serializer = new ODataJsonSerializer(contentType, new Constantsv00());
    }
  } else if (contentType != null && (contentType.isCompatible(ContentType.APPLICATION_XML)
      || contentType.isCompatible(ContentType.APPLICATION_ATOM_XML))) {
    serializer = new ODataXmlSerializer();
  }

  if (serializer == null) {
    throw new SerializerException("Unsupported format: " + 
  ((contentType != null) ? contentType.toContentTypeString() : null),
        SerializerException.MessageKeys.UNSUPPORTED_FORMAT, 
        ((contentType != null) ? contentType.toContentTypeString() : null));
  } else {
    return serializer;
  }
}
 

void handleServerError(final ODataRequest request, final ODataResponse response,
    final ODataServerError serverError) {
  try {
    ODataSerializer serializer = this.odata.createSerializer(this.contentType);
    ErrorResponse errorResponse = new ErrorResponse(this.metadata, serializer, this.contentType, response);
    handler.processError(serverError, errorResponse);
  } catch (Exception e) {
    // This should never happen but to be sure we have this catch here
    // to prevent sending a stacktrace to a client.
    String responseContent = "{\"error\":{\"code\":null,\"message\":\"An unexpected exception occurred during "
        + "error processing with message: " + e.getMessage() + "\"}}"; //$NON-NLS-1$ //$NON-NLS-2$
    response.setContent(new ByteArrayInputStream(responseContent.getBytes()));
    response.setStatusCode(HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode());
    response.setHeader(HttpHeader.CONTENT_TYPE,
        ContentType.APPLICATION_JSON.toContentTypeString());
  }
}
 

@Override
public void processError(final ODataRequest request, final ODataResponse response,
    final ODataServerError serverError,
    final ContentType requestedContentType) {
  try {
    ODataSerializer serializer = odata.createSerializer(requestedContentType);
    response.setContent(serializer.error(serverError).getContent());
    response.setStatusCode(serverError.getStatusCode());
    response.setHeader(HttpHeader.CONTENT_TYPE, requestedContentType.toContentTypeString());
  } catch (Exception e) {
    // This should never happen but to be sure we have this catch here to prevent sending a stacktrace to a client.
    String responseContent =
        "{\"error\":{\"code\":null,\"message\":\"An unexpected exception occurred during error processing\"}}";
    response.setContent(new ByteArrayInputStream(responseContent.getBytes(Charset.forName("utf-8"))));
    response.setStatusCode(HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode());
    response.setHeader(HttpHeader.CONTENT_TYPE, ContentType.APPLICATION_JSON.toContentTypeString());
  }
}
 

public void readEntityCollection(ODataRequest request, ODataResponse response, 
        UriInfo uriInfo, ContentType responseFormat) throws ODataApplicationException, SerializerException {

    // 1st we have retrieve the requested EntitySet from the uriInfo object 
    // (representation of the parsed service URI)
    List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
    // In our example, the first segment is the EntitySet
    UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0); 
    EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

    // 2nd: fetch the data from backend for this requested EntitySetName 
    // it has to be delivered as EntitySet object
    EntityCollection entitySet = getData(edmEntitySet);

    // 3rd: create a serializer based on the requested format (json)
    ODataSerializer serializer = odata.createSerializer(responseFormat);
    
    // 4th: Now serialize the content: transform from the EntitySet object to InputStream
    EdmEntityType edmEntityType = edmEntitySet.getEntityType();
    ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();

    final String id = request.getRawBaseUri() + "/" + edmEntitySet.getName();
    EntityCollectionSerializerOptions opts =
            EntityCollectionSerializerOptions.with().id(id).contextURL(contextUrl).build();
    SerializerResult serializedContent = serializer.entityCollection(serviceMetadata, 
        edmEntityType, entitySet, opts);

    // Finally: configure the response object: set the body, headers and status code
    response.setContent(serializedContent.getContent());
    response.setStatusCode(HttpStatusCode.OK.getStatusCode());
    response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntityCollection(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat) throws ODataApplicationException, SerializerException {

    // 1st we have retrieve the requested EntitySet from the uriInfo object (representation of the parsed service URI)
    List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
    UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0); // in our example, the first segment is the EntitySet
    EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

    // 2nd: fetch the data from backend for this requested EntitySetName // it has to be delivered as EntitySet object
    EntityCollection entitySet = getData(edmEntitySet);

    // 3rd: create a serializer based on the requested format (json)
    ODataSerializer serializer = odata.createSerializer(responseFormat);
    
    // 4th: Now serialize the content: transform from the EntitySet object to InputStream
    EdmEntityType edmEntityType = edmEntitySet.getEntityType();
    ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();

    final String id = request.getRawBaseUri() + "/" + edmEntitySet.getName();
    EntityCollectionSerializerOptions opts =
        EntityCollectionSerializerOptions.with().id(id).contextURL(contextUrl).build();
    SerializerResult serializedContent = serializer.entityCollection(serviceMetadata, edmEntityType, entitySet, opts);

    // Finally: configure the response object: set the body, headers and status code
    response.setContent(serializedContent.getContent());
    response.setStatusCode(HttpStatusCode.OK.getStatusCode());
    response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
  }
 

@Override
public void readEntity(final ODataRequest request, ODataResponse response, final UriInfo uriInfo,
    final ContentType requestedContentType) throws ODataApplicationException, SerializerException {
  // First we have to figure out which entity set the requested entity is in
  final EdmEntitySet edmEntitySet = getEdmEntitySet(uriInfo.asUriInfoResource());

  // Next we fetch the requested entity from the database
  Entity entity;
  try {
    entity = readEntityInternal(uriInfo.asUriInfoResource(), edmEntitySet);
  } catch (DataProviderException e) {
    throw new ODataApplicationException(e.getMessage(), 500, Locale.ENGLISH);
  }

  if (entity == null) {
    // If no entity was found for the given key we throw an exception.
    throw new ODataApplicationException("No entity found for this key", HttpStatusCode.NOT_FOUND
        .getStatusCode(), Locale.ENGLISH);
  } else {
    // If an entity was found we proceed by serializing it and sending it to the client.
    ODataSerializer serializer = odata.createSerializer(requestedContentType);
    final ExpandOption expand = uriInfo.getExpandOption();
    final SelectOption select = uriInfo.getSelectOption();
    InputStream serializedContent = serializer.entity(edm, edmEntitySet.getEntityType(), entity,
        EntitySerializerOptions.with()
            .contextURL(isODataMetadataNone(requestedContentType) ? null :
                getContextUrl(edmEntitySet, true, expand, select, null))
            .expand(expand).select(select)
            .build()).getContent();
    response.setContent(serializedContent);
    response.setStatusCode(HttpStatusCode.OK.getStatusCode());
    response.setHeader(HttpHeader.CONTENT_TYPE, requestedContentType.toContentTypeString());
  }
}
 

@Override
public void readEntityCollection(final ODataRequest request, ODataResponse response, final UriInfo uriInfo,
    final ContentType requestedContentType) throws ODataApplicationException, SerializerException {
  // First we have to figure out which entity set to use
  final EdmEntitySet edmEntitySet = getEdmEntitySet(uriInfo.asUriInfoResource());

  // Second we fetch the data for this specific entity set from the mock database and transform it into an EntitySet
  // object which is understood by our serialization
  EntityCollection entitySet = dataProvider.readAll(edmEntitySet);

  // Next we create a serializer based on the requested format. This could also be a custom format but we do not
  // support them in this example
  ODataSerializer serializer = odata.createSerializer(requestedContentType);

  // Now the content is serialized using the serializer.
  final ExpandOption expand = uriInfo.getExpandOption();
  final SelectOption select = uriInfo.getSelectOption();
  final String id = request.getRawBaseUri() + "/" + edmEntitySet.getName();
  InputStream serializedContent = serializer.entityCollection(edm, edmEntitySet.getEntityType(), entitySet,
      EntityCollectionSerializerOptions.with()
          .id(id)
          .contextURL(isODataMetadataNone(requestedContentType) ? null :
              getContextUrl(edmEntitySet, false, expand, select, null))
          .count(uriInfo.getCountOption())
          .expand(expand).select(select)
          .build()).getContent();

  // Finally we set the response data, headers and status code
  response.setContent(serializedContent);
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, requestedContentType.toContentTypeString());
}
 

public void readEntityCollection(ODataRequest request, ODataResponse response, UriInfo uriInfo,
    ContentType responseFormat) throws ODataApplicationException, SerializerException {

  // 1st retrieve the requested EntitySet from the uriInfo (representation of the parsed URI)
  List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
  // in our example, the first segment is the EntitySet
  UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
  EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

  // 2nd: fetch the data from backend for this requested EntitySetName
  // it has to be delivered as EntitySet object
  EntityCollection entitySet = storage.readEntitySetData(edmEntitySet);

  // 3rd: create a serializer based on the requested format (json)
  ODataSerializer serializer = odata.createSerializer(responseFormat);

  // and serialize the content: transform from the EntitySet object to InputStream
  EdmEntityType edmEntityType = edmEntitySet.getEntityType();
  ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();

  final String id = request.getRawBaseUri() + "/" + edmEntitySet.getName();
  EntityCollectionSerializerOptions opts =
      EntityCollectionSerializerOptions.with().id(id).contextURL(contextUrl).build();
  SerializerResult serializedContent = serializer.entityCollection(serviceMetadata, edmEntityType, entitySet, opts);

  // Finally: configure the response object: set the body, headers and status code
  response.setContent(serializedContent.getContent());
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo,
												 ContentType requestFormat, ContentType responseFormat)
			throws ODataApplicationException, DeserializerException, SerializerException {
	
	// 1. Retrieve the entity type from the URI 
	EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
	EdmEntityType edmEntityType = edmEntitySet.getEntityType();

	// 2. create the data in backend 
	// 2.1. retrieve the payload from the POST request for the entity to create and deserialize it
	InputStream requestInputStream = request.getBody();
	ODataDeserializer deserializer = this.odata.createDeserializer(requestFormat);
	DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
	Entity requestEntity = result.getEntity();
	// 2.2 do the creation in backend, which returns the newly created entity
	Entity createdEntity = storage.createEntityData(edmEntitySet, requestEntity);
	
	// 3. serialize the response (we have to return the created entity)
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build(); 
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build(); // expand and select currently not supported 
	
	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);
	
	//4. configure the response object
	response.setContent(serializedResponse.getContent());
	response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
     throws ODataApplicationException, SerializerException {
	
	// 1. retrieve the Entity Type 
	List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
	// Note: only in our example we can assume that the first segment is the EntitySet
	UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0); 
	EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();
	
	// 2. retrieve the data from backend
	List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
	Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);
	
	// 3. serialize
	EdmEntityType entityType = edmEntitySet.getEntityType();
	
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
 	// expand and select currently not supported
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult result = serializer.entity(serviceMetadata, entityType, entity, options);
	
	//4. configure the response object
	response.setContent(result.getContent());
	response.setStatusCode(HttpStatusCode.OK.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo,
												 ContentType requestFormat, ContentType responseFormat)
			throws ODataApplicationException, DeserializerException, SerializerException {
	
	// 1. Retrieve the entity type from the URI 
	EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
	EdmEntityType edmEntityType = edmEntitySet.getEntityType();

	// 2. create the data in backend 
	// 2.1. retrieve the payload from the POST request for the entity to create and deserialize it
	InputStream requestInputStream = request.getBody();
	ODataDeserializer deserializer = this.odata.createDeserializer(requestFormat);
	DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
	Entity requestEntity = result.getEntity();
	// 2.2 do the creation in backend, which returns the newly created entity
	Entity createdEntity = storage.createEntityData(edmEntitySet, requestEntity);
	
	// 3. serialize the response (we have to return the created entity)
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build(); 
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build(); // expand and select currently not supported 
	
	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);
	
	//4. configure the response object
	final String location = request.getRawBaseUri() + '/'
       + odata.createUriHelper().buildCanonicalURL(edmEntitySet, createdEntity);
	
	response.setHeader(HttpHeader.LOCATION, location);
	response.setContent(serializedResponse.getContent());
	response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo,
												 ContentType requestFormat, ContentType responseFormat)
			throws ODataApplicationException, DeserializerException, SerializerException {
	
	// 1. Retrieve the entity type from the URI 
	EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
	EdmEntityType edmEntityType = edmEntitySet.getEntityType();

	// 2. create the data in backend 
	// 2.1. retrieve the payload from the POST request for the entity to create and deserialize it
	InputStream requestInputStream = request.getBody();
	ODataDeserializer deserializer = odata.createDeserializer(requestFormat);
	DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
	Entity requestEntity = result.getEntity();
	// 2.2 do the creation in backend, which returns the newly created entity
	Entity createdEntity = storage.createEntityData(edmEntitySet, requestEntity);
	
	// 3. serialize the response (we have to return the created entity)
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build(); 
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build(); // expand and select currently not supported 
	
	ODataSerializer serializer = odata.createSerializer(responseFormat);
	SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);
	
	//4. configure the response object
	response.setContent(serializedResponse.getContent());
	response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

private void readFunctionImportCollection(final ODataRequest request, final ODataResponse response, 
    final UriInfo uriInfo, final ContentType responseFormat) throws ODataApplicationException, SerializerException {
  
  // 1st step: Analyze the URI and fetch the entity collection returned by the function import
  // Function Imports are always the first segment of the resource path
  final UriResource firstSegment = uriInfo.getUriResourceParts().get(0);
  
  if(!(firstSegment instanceof UriResourceFunction)) {
    throw new ODataApplicationException("Not implemented", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), 
        Locale.ENGLISH);
  }
  
  final UriResourceFunction uriResourceFunction = (UriResourceFunction) firstSegment;
  final EntityCollection entityCol = storage.readFunctionImportCollection(uriResourceFunction, serviceMetadata);
  
  // 2nd step: Serialize the response entity
  final EdmEntityType edmEntityType = (EdmEntityType) uriResourceFunction.getFunction().getReturnType().getType();
  final ContextURL contextURL = ContextURL.with().asCollection().type(edmEntityType).build();
  EntityCollectionSerializerOptions opts = EntityCollectionSerializerOptions.with().contextURL(contextURL).build();
  final ODataSerializer serializer = odata.createSerializer(responseFormat);
  final SerializerResult serializerResult = serializer.entityCollection(serviceMetadata, edmEntityType, entityCol, 
      opts); 

  // 3rd configure the response object
  response.setContent(serializerResult.getContent());
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
     throws ODataApplicationException, SerializerException {
	
	// 1. retrieve the Entity Type 
	List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
	// Note: only in our example we can assume that the first segment is the EntitySet
	UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0); 
	EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();
	
	// 2. retrieve the data from backend
	List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
	Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);
	
	// 3. serialize
	EdmEntityType entityType = edmEntitySet.getEntityType();
	
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
 	// expand and select currently not supported
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult result = serializer.entity(serviceMetadata, entityType, entity, options);
	
	//4. configure the response object
	response.setContent(result.getContent());
	response.setStatusCode(HttpStatusCode.OK.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

@Override
public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType requestFormat, ContentType responseFormat)
    throws ODataApplicationException, DeserializerException, SerializerException {
    // 1. Retrieve the entity type from the URI
    EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
    EdmEntityType edmEntityType = edmEntitySet.getEntityType();

    // 2. create the data in backend
    // 2.1. retrieve the payload from the POST request for the entity to
    // create and deserialize it
    InputStream requestInputStream = request.getBody();
    ODataDeserializer deserializer = this.odata.createDeserializer(requestFormat);
    DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
    Entity requestEntity = result.getEntity();
    LOG.info("Creating new entity {}", requestEntity);

    // 2.2 do the creation in backend, which returns the newly created
    // entity
    Entity createdEntity = storage.createEntityData(edmEntitySet, requestEntity);

    // 3. serialize the response (we have to return the created entity)
    ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();
    // expand and select currently not supported
    EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

    ODataSerializer serializer = this.odata.createSerializer(responseFormat);
    SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);

    // 4. configure the response object
    response.setContent(serializedResponse.getContent());
    response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
    response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntityCollection(ODataRequest request, ODataResponse response, UriInfo uriInfo,
    ContentType responseFormat) throws ODataApplicationException, SerializerException {

  // 1st retrieve the requested EntitySet from the uriInfo (representation of the parsed URI)
  List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
  // in our example, the first segment is the EntitySet
  UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
  EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

  // 2nd: fetch the data from backend for this requested EntitySetName
  // it has to be delivered as EntitySet object
  EntityCollection entitySet = storage.readEntitySetData(edmEntitySet);

  // 3rd: create a serializer based on the requested format (json)
  ODataSerializer serializer = odata.createSerializer(responseFormat);

  // and serialize the content: transform from the EntitySet object to InputStream
  EdmEntityType edmEntityType = edmEntitySet.getEntityType();
  ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();

  final String id = request.getRawBaseUri() + "/" + edmEntitySet.getName();
  EntityCollectionSerializerOptions opts =
      EntityCollectionSerializerOptions.with().id(id).contextURL(contextUrl).build();
  SerializerResult serializedContent = serializer.entityCollection(serviceMetadata, edmEntityType, entitySet, opts);

  // Finally: configure the response object: set the body, headers and status code
  response.setContent(serializedContent.getContent());
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo,
												 ContentType requestFormat, ContentType responseFormat)
			throws ODataApplicationException, DeserializerException, SerializerException {
	
	// 1. Retrieve the entity type from the URI 
	EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
	EdmEntityType edmEntityType = edmEntitySet.getEntityType();

	// 2. create the data in backend 
	// 2.1. retrieve the payload from the POST request for the entity to create and deserialize it
	InputStream requestInputStream = request.getBody();
	ODataDeserializer deserializer = odata.createDeserializer(requestFormat);
	DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
	Entity requestEntity = result.getEntity();
	// 2.2 do the creation in backend, which returns the newly created entity
	Entity createdEntity = null;
	
	try {
	  storage.beginTransaction();
	  createdEntity = storage.createEntityData(edmEntitySet, requestEntity, request.getRawBaseUri());
	  storage.commitTransaction();
	} catch( ODataApplicationException e ) {
	  storage.rollbackTransaction();
	  throw e;
	}
	  
	  // 3. serialize the response (we have to return the created entity)
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build(); 
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build(); // expand and select currently not supported 
	
	ODataSerializer serializer = odata.createSerializer(responseFormat);
	SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);
	
	//4. configure the response object
	response.setContent(serializedResponse.getContent());
	response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
    throws ODataApplicationException, SerializerException {

  // 1. retrieve the Entity Type
  List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
  // Note: only in our example we can assume that the first segment is the EntitySet
  UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
  EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

  // 2. retrieve the data from backend
  List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
  Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);

  // 3. serialize
  EdmEntityType entityType = edmEntitySet.getEntityType();

  ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
  // expand and select currently not supported
  EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

  ODataSerializer serializer = this.odata.createSerializer(responseFormat);
  SerializerResult serializerResult = serializer.entity(serviceMetadata, entityType, entity, options);
  InputStream entityStream = serializerResult.getContent();

  // 4. configure the response object
  response.setContent(entityStream);
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

private void readFunctionImportInternal(final ODataRequest request, final ODataResponse response, 
    final UriInfo uriInfo, final ContentType responseFormat) throws ODataApplicationException, SerializerException {
  
  // 1st step: Analyze the URI and fetch the entity returned by the function import
  // Function Imports are always the first segment of the resource path
  final UriResource firstSegment = uriInfo.getUriResourceParts().get(0);
  
  if(!(firstSegment instanceof UriResourceFunction)) {
    throw new ODataApplicationException("Not implemented", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), 
        Locale.ENGLISH);
  }
  
  final UriResourceFunction uriResourceFunction = (UriResourceFunction) firstSegment;
  final Entity entity = storage.readFunctionImportEntity(uriResourceFunction, serviceMetadata);
  
  if(entity == null) {
    throw new ODataApplicationException("Nothing found.", HttpStatusCode.NOT_FOUND.getStatusCode(), Locale.ROOT);
  }
  
  // 2nd step: Serialize the response entity
  final EdmEntityType edmEntityType = (EdmEntityType) uriResourceFunction.getFunction().getReturnType().getType();
  final ContextURL contextURL = ContextURL.with().type(edmEntityType).build();
   final EntitySerializerOptions opts = EntitySerializerOptions.with().contextURL(contextURL).build();
   final ODataSerializer serializer = odata.createSerializer(responseFormat);
   final SerializerResult serializerResult = serializer.entity(serviceMetadata, edmEntityType, entity, opts);

   // 3rd configure the response object
   response.setContent(serializerResult.getContent());
   response.setStatusCode(HttpStatusCode.OK.getStatusCode());
   response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntityCollection(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat) throws ODataApplicationException, SerializerException {

		// 1st retrieve the requested EntitySet from the uriInfo (representation of the parsed URI)
		List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
		UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0); // in our example, the first segment is the EntitySet
		EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

		// 2nd: fetch the data from backend for this requested EntitySetName and deliver as EntitySet
		EntityIterator iterator = storage.readEntitySetDataStreamed(edmEntitySet);

		// 3rd: create a serializer based on the requested format (json)
		ODataSerializer serializer = odata.createSerializer(responseFormat);

		// and serialize the content: transform from the EntitySet object to InputStream
		EdmEntityType edmEntityType = edmEntitySet.getEntityType();
		ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();

		final String id = request.getRawBaseUri() + "/" + edmEntitySet.getName();
		EntityCollectionSerializerOptions opts =
				EntityCollectionSerializerOptions.with().id(id)
						.writeContentErrorCallback(errorCallback)
						.contextURL(contextUrl).build();

		SerializerStreamResult serializerResult = serializer.entityCollectionStreamed(serviceMetadata,
				edmEntityType, iterator, opts);

		// 4th: configure the response object: set the body, headers and status code
		response.setODataContent(serializerResult.getODataContent());
		response.setStatusCode(HttpStatusCode.OK.getStatusCode());
		response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
	}
 

public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
						throws ODataApplicationException, SerializerException {

	// 1. retrieve the Entity Type
	List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
	// Note: only in our example we can assume that the first segment is the EntitySet
	UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
	EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

	// 2. retrieve the data from backend
	List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
	Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);

	// 3. serialize
	EdmEntityType entityType = edmEntitySet.getEntityType();

	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
 	// expand and select currently not supported
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult serializerResult = serializer.entity(serviceMetadata, entityType, entity, options);
	InputStream entityStream = serializerResult.getContent();

	//4. configure the response object
	response.setContent(entityStream);
	response.setStatusCode(HttpStatusCode.OK.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo,
												 ContentType requestFormat, ContentType responseFormat)
			throws ODataApplicationException, DeserializerException, SerializerException {
	
	// 1. Retrieve the entity type from the URI 
	EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
	EdmEntityType edmEntityType = edmEntitySet.getEntityType();

	// 2. create the data in backend 
	// 2.1. retrieve the payload from the POST request for the entity to create and deserialize it
	InputStream requestInputStream = request.getBody();
	ODataDeserializer deserializer = odata.createDeserializer(requestFormat);
	DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
	Entity requestEntity = result.getEntity();
	// 2.2 do the creation in backend, which returns the newly created entity
	Entity createdEntity = storage.createEntityData(edmEntitySet, requestEntity);
	
	// 3. serialize the response (we have to return the created entity)
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build(); 
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build(); // expand and select currently not supported 
	
	ODataSerializer serializer = odata.createSerializer(responseFormat);
	SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);
	
	//4. configure the response object
	response.setContent(serializedResponse.getContent());
	response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

private void readFunctionImportCollection(final ODataRequest request, final ODataResponse response, 
    final UriInfo uriInfo, final ContentType responseFormat) throws ODataApplicationException, SerializerException {
  
  // 1st step: Analyze the URI and fetch the entity collection returned by the function import
  // Function Imports are always the first segment of the resource path
  final UriResource firstSegment = uriInfo.getUriResourceParts().get(0);
  
  if(!(firstSegment instanceof UriResourceFunction)) {
    throw new ODataApplicationException("Not implemented", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), 
        Locale.ENGLISH);
  }
  
  final UriResourceFunction uriResourceFunction = (UriResourceFunction) firstSegment;
  final EntityCollection entityCol = storage.readFunctionImportCollection(uriResourceFunction, serviceMetadata);
  
  // 2nd step: Serialize the response entity
  final EdmEntityType edmEntityType = (EdmEntityType) uriResourceFunction.getFunction().getReturnType().getType();
  final ContextURL contextURL = ContextURL.with().asCollection().type(edmEntityType).build();
  EntityCollectionSerializerOptions opts = EntityCollectionSerializerOptions.with().contextURL(contextURL).build();
  final ODataSerializer serializer = odata.createSerializer(responseFormat);
  final SerializerResult serializerResult = serializer.entityCollection(serviceMetadata, edmEntityType, entityCol, 
      opts); 

  // 3rd configure the response object
  response.setContent(serializerResult.getContent());
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

private void readFunctionImportInternal(final ODataRequest request, final ODataResponse response,
    final UriInfo uriInfo, final ContentType responseFormat) throws ODataApplicationException, SerializerException {

  // 1st step: Analyze the URI and fetch the entity returned by the function import
  // Function Imports are always the first segment of the resource path
  final UriResource firstSegment = uriInfo.getUriResourceParts().get(0);

  if (!(firstSegment instanceof UriResourceFunction)) {
    throw new ODataApplicationException("Not implemented", HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(),
        Locale.ENGLISH);
  }

  final UriResourceFunction uriResourceFunction = (UriResourceFunction) firstSegment;
  final Entity entity = storage.readFunctionImportEntity(uriResourceFunction, serviceMetadata);

  if (entity == null) {
    throw new ODataApplicationException("Nothing found.", HttpStatusCode.NOT_FOUND.getStatusCode(), Locale.ROOT);
  }

  // 2nd step: Serialize the response entity
  final EdmEntityType edmEntityType = (EdmEntityType) uriResourceFunction.getFunction().getReturnType().getType();
  final ContextURL contextURL = ContextURL.with().type(edmEntityType).build();
  final EntitySerializerOptions opts = EntitySerializerOptions.with().contextURL(contextURL).build();
  final ODataSerializer serializer = odata.createSerializer(responseFormat);
  final SerializerResult serializerResult = serializer.entity(serviceMetadata, edmEntityType, entity, opts);

  // 3rd configure the response object
  response.setContent(serializerResult.getContent());
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo,
												 ContentType requestFormat, ContentType responseFormat)
			throws ODataApplicationException, DeserializerException, SerializerException {
	
	// 1. Retrieve the entity type from the URI 
	EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
	EdmEntityType edmEntityType = edmEntitySet.getEntityType();

	// 2. create the data in backend 
	// 2.1. retrieve the payload from the POST request for the entity to create and deserialize it
	InputStream requestInputStream = request.getBody();
	ODataDeserializer deserializer = odata.createDeserializer(requestFormat);
	DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
	Entity requestEntity = result.getEntity();
	// 2.2 do the creation in backend, which returns the newly created entity
	Entity createdEntity = storage.createEntityData(edmEntitySet, requestEntity);
	
	// 3. serialize the response (we have to return the created entity)
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build(); 
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build(); // expand and select currently not supported 
	
	ODataSerializer serializer = odata.createSerializer(responseFormat);
	SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);
	
	//4. configure the response object
	response.setContent(serializedResponse.getContent());
	response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
						throws ODataApplicationException, SerializerException {

	// 1. retrieve the Entity Type
	List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
	// Note: only in our example we can assume that the first segment is the EntitySet
	UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
	EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

	// 2. retrieve the data from backend
	List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
	Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);

	// 3. serialize
	EdmEntityType entityType = edmEntitySet.getEntityType();

	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
 	// expand and select currently not supported
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult serializerResult = serializer.entity(serviceMetadata, entityType, entity, options);
	InputStream entityStream = serializerResult.getContent();

	//4. configure the response object
	response.setContent(entityStream);
	response.setStatusCode(HttpStatusCode.OK.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void createEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo,
												 ContentType requestFormat, ContentType responseFormat)
			throws ODataApplicationException, DeserializerException, SerializerException {
	
	// 1. Retrieve the entity type from the URI 
	EdmEntitySet edmEntitySet = Util.getEdmEntitySet(uriInfo);
	EdmEntityType edmEntityType = edmEntitySet.getEntityType();

	// 2. create the data in backend 
	// 2.1. retrieve the payload from the POST request for the entity to create and deserialize it
	InputStream requestInputStream = request.getBody();
	ODataDeserializer deserializer = odata.createDeserializer(requestFormat);
	DeserializerResult result = deserializer.entity(requestInputStream, edmEntityType);
	Entity requestEntity = result.getEntity();
	// 2.2 do the creation in backend, which returns the newly created entity
	Entity createdEntity = null;
	
	try {
	  storage.beginTransaction();
	  createdEntity = storage.createEntityData(edmEntitySet, requestEntity, request.getRawBaseUri());
	  storage.commitTransaction();
	} catch( ODataApplicationException e ) {
	  storage.rollbackTransaction();
	  throw e;
	}
	  
	  // 3. serialize the response (we have to return the created entity)
	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build(); 
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build(); // expand and select currently not supported 
	
	ODataSerializer serializer = odata.createSerializer(responseFormat);
	SerializerResult serializedResponse = serializer.entity(serviceMetadata, edmEntityType, createdEntity, options);
	
	//4. configure the response object
	response.setContent(serializedResponse.getContent());
	response.setStatusCode(HttpStatusCode.CREATED.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntityCollection(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat) throws ODataApplicationException, SerializerException {

		// 1st retrieve the requested EntitySet from the uriInfo (representation of the parsed URI)
		List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
		UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0); // in our example, the first segment is the EntitySet
		EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

		// 2nd: fetch the data from backend for this requested EntitySetName and deliver as EntitySet
		EntityCollection entityCollection = storage.readEntitySetData(edmEntitySet);

		// 3rd: create a serializer based on the requested format (json)
		ODataSerializer serializer = odata.createSerializer(responseFormat);

		// and serialize the content: transform from the EntitySet object to InputStream
		EdmEntityType edmEntityType = edmEntitySet.getEntityType();
		ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).build();

		final String id = request.getRawBaseUri() + "/" + edmEntitySet.getName();
		EntityCollectionSerializerOptions opts =
				EntityCollectionSerializerOptions.with().id(id).contextURL(contextUrl).build();
		SerializerResult serializerResult = serializer.entityCollection(serviceMetadata, edmEntityType, entityCollection, opts);
		InputStream serializedContent = serializerResult.getContent();

		// 4th: configure the response object: set the body, headers and status code
		response.setContent(serializedContent);
		response.setStatusCode(HttpStatusCode.OK.getStatusCode());
		response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
	}
 

public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
						throws ODataApplicationException, SerializerException {

	// 1. retrieve the Entity Type
	List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
	// Note: only in our example we can assume that the first segment is the EntitySet
	UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
	EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

	// 2. retrieve the data from backend
	List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
	Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);

	// 3. serialize
	EdmEntityType entityType = edmEntitySet.getEntityType();

	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
 	// expand and select currently not supported
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult serializerResult = serializer.entity(serviceMetadata, entityType, entity, options);
	InputStream entityStream = serializerResult.getContent();

	//4. configure the response object
	response.setContent(entityStream);
	response.setStatusCode(HttpStatusCode.OK.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}
 

public void readEntity(ODataRequest request, ODataResponse response, UriInfo uriInfo, ContentType responseFormat)
						throws ODataApplicationException, SerializerException {

	// 1. retrieve the Entity Type
	List<UriResource> resourcePaths = uriInfo.getUriResourceParts();
	// Note: only in our example we can assume that the first segment is the EntitySet
	UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) resourcePaths.get(0);
	EdmEntitySet edmEntitySet = uriResourceEntitySet.getEntitySet();

	// 2. retrieve the data from backend
	List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
	Entity entity = storage.readEntityData(edmEntitySet, keyPredicates);

	// 3. serialize
	EdmEntityType entityType = edmEntitySet.getEntityType();

	ContextURL contextUrl = ContextURL.with().entitySet(edmEntitySet).suffix(ContextURL.Suffix.ENTITY).build();
 	// expand and select currently not supported
	EntitySerializerOptions options = EntitySerializerOptions.with().contextURL(contextUrl).build();

	ODataSerializer serializer = this.odata.createSerializer(responseFormat);
	SerializerResult serializerResult = serializer.entity(serviceMetadata, entityType, entity, options);
	InputStream entityStream = serializerResult.getContent();

	//4. configure the response object
	response.setContent(entityStream);
	response.setStatusCode(HttpStatusCode.OK.getStatusCode());
	response.setHeader(HttpHeader.CONTENT_TYPE, responseFormat.toContentTypeString());
}