Java Code Examples for org.apache.olingo.commons.api.edm.EdmNavigationProperty#containsTarget()

static String getTargetEntitySet(EdmBindingTarget root, LinkedList<UriResourceNavigation> navigations) {
  EdmEntityType type = root.getEntityType();
  EdmBindingTarget targetEntitySet = root;
  String targetEntitySetName = root.getName();
  String name = null;
  for (UriResourceNavigation nav:navigations) {
    name = nav.getProperty().getName();
    EdmNavigationProperty property = type.getNavigationProperty(name);
    if (property.containsTarget()) {
      return root.getName();
    }
    type = nav.getProperty().getType();
    
    for(EdmNavigationPropertyBinding enb:targetEntitySet.getNavigationPropertyBindings()) {
      if (enb.getPath().equals(name)) {
        targetEntitySetName = enb.getTarget();
      } else if (enb.getPath().endsWith("/"+name)) {
        targetEntitySetName = enb.getTarget();
      }
    }
  }
  return targetEntitySetName;
}
 

public NavPropertyBindingDetails getNavigationBindingDetails(
        final EdmStructuredType sourceEntityType, final EdmNavigationProperty property) {

  if (property.containsTarget()) {
    return new NavPropertyContainsTarget(edm, property.getType());
  }

  try {
    return getNavigationBindings(sourceEntityType, property);
  } catch (Exception e) {
    // maybe source entity type without entity set ...
    return getNavigationBindings(property.getType(), property.getName());
  }
}
 

private void appendNavigationProperties(final JsonGenerator json, 
    final EdmStructuredType type) throws SerializerException, IOException {
  List<String> navigationPropertyNames = new ArrayList<>(type.getNavigationPropertyNames());
  if (type.getBaseType() != null) {
    navigationPropertyNames.removeAll(type.getBaseType().getNavigationPropertyNames());
  }
  for (String navigationPropertyName : navigationPropertyNames) {
    EdmNavigationProperty navigationProperty = type.getNavigationProperty(navigationPropertyName);
    json.writeObjectFieldStart(navigationPropertyName);
    json.writeStringField(KIND, Kind.NavigationProperty.name());
    
    json.writeStringField(TYPE, getAliasedFullQualifiedName(navigationProperty.getType()));
    if (navigationProperty.isCollection()) {
      json.writeBooleanField(COLLECTION, navigationProperty.isCollection());
    }
    
    if (!navigationProperty.isNullable()) {
      json.writeBooleanField(NULLABLE, navigationProperty.isNullable());
    }

    if (navigationProperty.getPartner() != null) {
      EdmNavigationProperty partner = navigationProperty.getPartner();
      json.writeStringField(PARTNER, partner.getName());
    }

    if (navigationProperty.containsTarget()) {
      json.writeBooleanField(CONTAINS_TARGET, navigationProperty.containsTarget());
    }

    if (navigationProperty.getReferentialConstraints() != null) {
      for (EdmReferentialConstraint constraint : navigationProperty.getReferentialConstraints()) {
        json.writeObjectFieldStart(REFERENTIAL_CONSTRAINT);
        json.writeStringField(constraint.getPropertyName(), constraint.getReferencedPropertyName());
        for (EdmAnnotation annotation : constraint.getAnnotations()) {
          appendAnnotations(json, annotation, null);
        }
        json.writeEndObject();
      }
    }
    
    if (navigationProperty.getOnDelete() != null) {
      json.writeObjectFieldStart(ON_DELETE);
      json.writeStringField(ON_DELETE_PROPERTY, navigationProperty.getOnDelete().getAction());
      appendAnnotations(json, navigationProperty.getOnDelete(), null);
      json.writeEndObject();
    }

    appendAnnotations(json, navigationProperty, null);

    json.writeEndObject();
  }
}
 

private void appendNavigationProperties(final XMLStreamWriter writer, final EdmStructuredType type)
    throws XMLStreamException {
  List<String> navigationPropertyNames = new ArrayList<>(type.getNavigationPropertyNames());
  if (type.getBaseType() != null) {
    navigationPropertyNames.removeAll(type.getBaseType().getNavigationPropertyNames());
  }
  for (String navigationPropertyName : navigationPropertyNames) {
    EdmNavigationProperty navigationProperty = type.getNavigationProperty(navigationPropertyName);

    writer.writeStartElement(XML_NAVIGATION_PROPERTY);
    writer.writeAttribute(XML_NAME, navigationPropertyName);
    writer.writeAttribute(XML_TYPE, getAliasedFullQualifiedName(navigationProperty.getType(), navigationProperty
        .isCollection()));
    if (!navigationProperty.isNullable()) {
      writer.writeAttribute(XML_NULLABLE, "" + navigationProperty.isNullable());
    }

    if (navigationProperty.getPartner() != null) {
      EdmNavigationProperty partner = navigationProperty.getPartner();
      writer.writeAttribute(XML_PARTNER, partner.getName());
    }

    if (navigationProperty.containsTarget()) {
      writer.writeAttribute(XML_CONTAINS_TARGET, "" + navigationProperty.containsTarget());
    }

    if (navigationProperty.getReferentialConstraints() != null) {
      for (EdmReferentialConstraint constraint : navigationProperty.getReferentialConstraints()) {
        writer.writeStartElement("ReferentialConstraint");
        writer.writeAttribute(XML_PROPERTY, constraint.getPropertyName());
        writer.writeAttribute("ReferencedProperty", constraint.getReferencedPropertyName());
        appendAnnotations(writer, constraint);
        writer.writeEndElement();
      }
    }
    
    if (navigationProperty.getOnDelete() != null) {
      writer.writeStartElement(XML_ON_DELETE);
      writer.writeAttribute(XML_ON_DELETE_PROPERTY, navigationProperty.getOnDelete().getAction());
      appendAnnotations(writer, navigationProperty.getOnDelete());
      writer.writeEndElement();
    }

    appendAnnotations(writer, navigationProperty);

    writer.writeEndElement();
  }
}
 

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

  EdmEntitySet responseEdmEntitySet = null; // we'll need this to build the ContextURL
  EntityCollection responseEntityCollection = null; // we'll need this to set the response body
  EdmEntityType responseEdmEntityType = null;

  // 1st retrieve the requested EntitySet from the uriInfo (representation of the parsed URI)
  List<UriResource> resourceParts = uriInfo.getUriResourceParts();
  int segmentCount = resourceParts.size();

  UriResource uriResource = resourceParts.get(0); // in our example, the first segment is the EntitySet
  if (!(uriResource instanceof UriResourceEntitySet)) {
    throw new ODataApplicationException("Only EntitySet is supported",
        HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ROOT);
  }

  UriResourceEntitySet uriResourceEntitySet = (UriResourceEntitySet) uriResource;
  EdmEntitySet startEdmEntitySet = uriResourceEntitySet.getEntitySet();

  if (segmentCount == 1) { // this is the case for: DemoService/DemoService.svc/Categories
    responseEdmEntitySet = startEdmEntitySet; // the response body is built from the first (and only) entitySet

    // 2nd: fetch the data from backend for this requested EntitySetName and deliver as EntitySet
    responseEntityCollection = storage.readEntitySetData(startEdmEntitySet);
  } else if (segmentCount == 2) { // in case of navigation: DemoService.svc/Categories(3)/Products

    UriResource lastSegment = resourceParts.get(1); // in our example we don't support more complex URIs
    if (lastSegment instanceof UriResourceNavigation) {
      UriResourceNavigation uriResourceNavigation = (UriResourceNavigation) lastSegment;
      EdmNavigationProperty edmNavigationProperty = uriResourceNavigation.getProperty();
      EdmEntityType targetEntityType = edmNavigationProperty.getType();
      if (!edmNavigationProperty.containsTarget()) {
     // from Categories(1) to Products
        responseEdmEntitySet = Util.getNavigationTargetEntitySet(startEdmEntitySet, edmNavigationProperty);
      } else {
        responseEdmEntitySet = startEdmEntitySet;
        responseEdmEntityType = targetEntityType;
      }

      // 2nd: fetch the data from backend
      // first fetch the entity where the first segment of the URI points to
      List<UriParameter> keyPredicates = uriResourceEntitySet.getKeyPredicates();
      // e.g. for Categories(3)/Products we have to find the single entity: Category with ID 3
      Entity sourceEntity = storage.readEntityData(startEdmEntitySet, keyPredicates);
      // error handling for e.g. DemoService.svc/Categories(99)/Products
      if (sourceEntity == null) {
        throw new ODataApplicationException("Entity not found.",
            HttpStatusCode.NOT_FOUND.getStatusCode(), Locale.ROOT);
      }
      // then fetch the entity collection where the entity navigates to
      // note: we don't need to check uriResourceNavigation.isCollection(),
      // because we are the EntityCollectionProcessor
      responseEntityCollection = storage.getRelatedEntityCollection(sourceEntity, targetEntityType);
    }
  } else { // this would be the case for e.g. Products(1)/Category/Products
    throw new ODataApplicationException("Not supported",
        HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ROOT);
  }

  ContextURL contextUrl = null;
  EdmEntityType edmEntityType = null;
  // 3rd: create and configure a serializer
  if (isContNav(uriInfo)) {
    contextUrl = ContextURL.with().entitySetOrSingletonOrType(request.getRawODataPath()).build();
    edmEntityType = responseEdmEntityType;
  } else {
    contextUrl = ContextURL.with().entitySet(responseEdmEntitySet).build(); 
    edmEntityType = responseEdmEntitySet.getEntityType();
  }
  final String id = request.getRawBaseUri() + "/" + responseEdmEntitySet.getName();
  EntityCollectionSerializerOptions opts = EntityCollectionSerializerOptions.with()
      .contextURL(contextUrl).id(id).build();
  
  ODataSerializer serializer = odata.createSerializer(responseFormat);
  SerializerResult serializerResult = serializer.entityCollection(this.srvMetadata, edmEntityType,
      responseEntityCollection, opts);

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