Java Code Examples for org.apache.olingo.server.api.uri.UriInfo#getExpandOption()

@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());
}
 

@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());
  }
}
 

private void readEntity(final ODataRequest request, final ODataResponse response, final UriInfo uriInfo,
    final ContentType requestedFormat, final boolean isReference)
    throws ODataApplicationException, ODataLibraryException {
  //
  if (odata.createPreferences(request.getHeaders(HttpHeader.PREFER)).hasRespondAsync()) {
    TechnicalAsyncService asyncService = TechnicalAsyncService.getInstance();
    TechnicalEntityProcessor processor = new TechnicalEntityProcessor(dataProvider, serviceMetadata);
    processor.init(odata, serviceMetadata);
    AsyncProcessor<EntityProcessor> asyncProcessor = asyncService.register(processor, EntityProcessor.class);
    asyncProcessor.prepareFor().readEntity(request, response, uriInfo, requestedFormat);
    String location = asyncProcessor.processAsync();
    TechnicalAsyncService.acceptedResponse(response, location);
    //
    return;
  }
  //

  final EdmEntitySet edmEntitySet = getEdmEntitySet(uriInfo);
  
  //for Singleton/$ref edmEntityset will be null throw error
  validateSingletonRef(isReference,edmEntitySet);
 
  EdmEntityType edmEntityType = null;
  edmEntityType = getEdmTypeForContNavProperty(uriInfo);
  final boolean iscontNav = checkIfContNavigation(uriInfo);
  if (edmEntityType == null) {
    edmEntityType = getEdmType(uriInfo, edmEntitySet);
  }

  final Entity entity = readEntity(uriInfo);

  if (odata.createETagHelper().checkReadPreconditions(entity.getETag(),
      request.getHeaders(HttpHeader.IF_MATCH),
      request.getHeaders(HttpHeader.IF_NONE_MATCH))) {
    response.setStatusCode(HttpStatusCode.NOT_MODIFIED.getStatusCode());
    response.setHeader(HttpHeader.ETAG, entity.getETag());
    return;
  }

  final ExpandOption expand = uriInfo.getExpandOption();
  final SelectOption select = uriInfo.getSelectOption();

  final ExpandSystemQueryOptionHandler expandHandler = new ExpandSystemQueryOptionHandler();
  final Entity entitySerialization = expandHandler.transformEntityGraphToTree(entity, edmEntitySet, expand, null);
  expandHandler.applyExpandQueryOptions(entitySerialization, edmEntitySet, expand, uriInfo,
      serviceMetadata.getEdm());

  final SerializerResult serializerResult = isReference ?
      serializeReference(entity, edmEntitySet, requestedFormat) :
      serializeEntity(request, entitySerialization, edmEntitySet, edmEntityType, 
          requestedFormat, expand, select, iscontNav);

  if (entity.getETag() != null) {
    response.setHeader(HttpHeader.ETAG, entity.getETag());
  }
  response.setContent(serializerResult.getContent());
  response.setStatusCode(HttpStatusCode.OK.getStatusCode());
  response.setHeader(HttpHeader.CONTENT_TYPE, requestedFormat.toContentTypeString());
}
 

private void readProperty(final ODataRequest request, ODataResponse response, final UriInfo uriInfo,
    final ContentType contentType, final RepresentationType representationType)
        throws ODataApplicationException, ODataLibraryException {
  final UriInfoResource resource = uriInfo.asUriInfoResource();
  validateOptions(resource);
  validatePath(resource);
  final EdmEntitySet edmEntitySet = getEdmEntitySet(resource);

  final List<UriResource> resourceParts = resource.getUriResourceParts();
  final int trailing =
      representationType == RepresentationType.COUNT || representationType == RepresentationType.VALUE ? 1 : 0;
  final List<String> path = getPropertyPath(resourceParts, trailing);

  final Entity entity = readEntity(uriInfo);

  if (entity != null && entity.getETag() != null) {
    if (odata.createETagHelper().checkReadPreconditions(entity.getETag(),
        request.getHeaders(HttpHeader.IF_MATCH),
        request.getHeaders(HttpHeader.IF_NONE_MATCH))) {
      response.setStatusCode(HttpStatusCode.NOT_MODIFIED.getStatusCode());
      response.setHeader(HttpHeader.ETAG, entity.getETag());
      return;
    }
  }

  final Property property = entity == null ?
      getPropertyData(
          dataProvider.readFunctionPrimitiveComplex(((UriResourceFunction) resourceParts.get(0)).getFunction(),
          ((UriResourceFunction) resourceParts.get(0)).getParameters(), resource), path) :
      getData(entity, path, resourceParts, resource);

  // TODO: implement filter on collection properties (on a shallow copy of the values)
  // FilterHandler.applyFilterSystemQuery(uriInfo.getFilterOption(), property, uriInfo, serviceMetadata.getEdm());

  if (property == null && representationType != RepresentationType.COUNT) {
    if (representationType == RepresentationType.VALUE) {
      response.setStatusCode(HttpStatusCode.NO_CONTENT.getStatusCode());
    } else {
      throw new ODataApplicationException("Nothing found.", HttpStatusCode.NOT_FOUND.getStatusCode(), Locale.ROOT);
    }
  } else {
    if (property.getValue() == null && representationType != RepresentationType.COUNT) {
      response.setStatusCode(HttpStatusCode.NO_CONTENT.getStatusCode());
    } else {
      response.setStatusCode(HttpStatusCode.OK.getStatusCode());
      if (representationType == RepresentationType.COUNT) {
        response.setContent(odata.createFixedFormatSerializer().count(
            property.asCollection().size()));
      } else {
        final EdmProperty edmProperty = path.isEmpty() ? null :
            ((UriResourceProperty) resourceParts.get(resourceParts.size() - trailing - 1)).getProperty();
        EdmType type = null;
        if (resourceParts.get(resourceParts.size() - trailing - 1) 
           instanceof UriResourceComplexProperty &&
            ((UriResourceComplexProperty)resourceParts.get(resourceParts.size() - trailing - 1)).
            getComplexTypeFilter() != null) {
          type = ((UriResourceComplexProperty)resourceParts.get(resourceParts.size() - trailing - 1)).
              getComplexTypeFilter();
        }else if(resourceParts.get(resourceParts.size() - trailing - 1) 
           instanceof UriResourceFunction &&
            ((UriResourceFunction)resourceParts.get(resourceParts.size() - trailing - 1)).
            getFunction() != null){ 
          type = ((UriResourceFunction)resourceParts.get(resourceParts.size() - trailing - 1)).
              getType();
        }else {
          type = edmProperty == null ?
              ((UriResourceFunction) resourceParts.get(0)).getType() :
              edmProperty.getType();
        }
        final EdmReturnType returnType = resourceParts.get(0) instanceof UriResourceFunction ?
            ((UriResourceFunction) resourceParts.get(0)).getFunction().getReturnType() : 
              resourceParts.get(1) instanceof UriResourceFunction ? 
                  ((UriResourceFunction) resourceParts.get(1)).getFunction().getReturnType():null ;

        if (representationType == RepresentationType.VALUE) {
          response.setContent(serializePrimitiveValue(property, edmProperty, (EdmPrimitiveType) type, returnType));
        }else if(representationType == RepresentationType.PRIMITIVE && type.getFullQualifiedName()
            .getFullQualifiedNameAsString().equals(EDMSTREAM)){
          response.setContent(odata.createFixedFormatSerializer().binary(dataProvider.readStreamProperty(property)));
          response.setStatusCode(HttpStatusCode.OK.getStatusCode());
          response.setHeader(HttpHeader.CONTENT_TYPE, ((Link)property.getValue()).getType());
          if (entity.getMediaETag() != null) {
            response.setHeader(HttpHeader.ETAG, entity.getMediaETag());
          }
        }else {
          final ExpandOption expand = uriInfo.getExpandOption();
          final SelectOption select = uriInfo.getSelectOption();
          final SerializerResult result = serializeProperty(entity, edmEntitySet, path, property, edmProperty,
              type, returnType, representationType, contentType, expand, select);
          response.setContent(result.getContent());
        }
      }
      response.setHeader(HttpHeader.CONTENT_TYPE, contentType.toContentTypeString());
    }
    if (entity != null && entity.getETag() != null) {
      response.setHeader(HttpHeader.ETAG, entity.getETag());
    }
  }
}