private Delta delta()

in lib/client-core/src/main/java/org/apache/olingo/client/core/serialization/AtomDeserializer.java [476:565]
82 lines of code
29 McCabe index (conditional complexity)

  private Delta delta(final XMLEventReader reader, final StartElement start)
      throws XMLStreamException, EdmPrimitiveTypeException {
    if (!Constants.QNAME_ATOM_ELEM_FEED.equals(start.getName())) {
      return null;
    }
    final Delta delta = new Delta();
    final Attribute xmlBase = start.getAttributeByName(Constants.QNAME_ATTR_XML_BASE);
    if (xmlBase != null) {
      delta.setBaseURI(URI.create(xmlBase.getValue()));
    }

    boolean foundEndFeed = false;
    while (reader.hasNext() && !foundEndFeed) {
      final XMLEvent event = reader.nextEvent();
      if (event.isStartElement()) {
        if (countQName.equals(event.asStartElement().getName())) {
          count(reader, event.asStartElement(), delta);
        } else if (Constants.QNAME_ATOM_ELEM_ID.equals(event.asStartElement().getName())) {
          common(reader, event.asStartElement(), delta, "id");
        } else if (Constants.QNAME_ATOM_ELEM_TITLE.equals(event.asStartElement().getName())) {
          common(reader, event.asStartElement(), delta, "title");
        } else if (Constants.QNAME_ATOM_ELEM_SUMMARY.equals(event.asStartElement().getName())) {
          common(reader, event.asStartElement(), delta, "summary");
        } else if (Constants.QNAME_ATOM_ELEM_UPDATED.equals(event.asStartElement().getName())) {
          common(reader, event.asStartElement(), delta, "updated");
        } else if (Constants.QNAME_ATOM_ELEM_LINK.equals(event.asStartElement().getName())) {
          final Attribute rel = event.asStartElement().getAttributeByName(QName.valueOf(Constants.ATTR_REL));
          if (rel != null) {
            if (Constants.NEXT_LINK_REL.equals(rel.getValue())) {
              final Attribute href = event.asStartElement().getAttributeByName(QName.valueOf(Constants.ATTR_HREF));
              if (href != null) {
                delta.setNext(URI.create(href.getValue()));
              }
            }
            if (Constants.NS_DELTA_LINK_REL.equals(rel.getValue())) {
              final Attribute href = event.asStartElement().getAttributeByName(QName.valueOf(Constants.ATTR_HREF));
              if (href != null) {
                delta.setDeltaLink(URI.create(href.getValue()));
              }
            }
          }
        } else if (Constants.QNAME_ATOM_ELEM_ENTRY.equals(event.asStartElement().getName())) {
          delta.getEntities().add(entity(reader, event.asStartElement()));
        } else if (deletedEntryQName.equals(event.asStartElement().getName())) {
          final DeletedEntity deletedEntity = new DeletedEntity();

          final Attribute ref = event.asStartElement().getAttributeByName(QName.valueOf(Constants.ATTR_REF));
          if (ref != null) {
            deletedEntity.setId(URI.create(ref.getValue()));
          }
          final Attribute reason = event.asStartElement().getAttributeByName(reasonQName);
          if (reason != null) {
            deletedEntity.setReason(Reason.valueOf(reason.getValue()));
          }

          delta.getDeletedEntities().add(deletedEntity);
        } else if (linkQName.equals(event.asStartElement().getName())
            || deletedLinkQName.equals(event.asStartElement().getName())) {

          final DeltaLink link = new DeltaLink();

          final Attribute source = event.asStartElement().getAttributeByName(QName.valueOf(Constants.ATTR_SOURCE));
          if (source != null) {
            link.setSource(URI.create(source.getValue()));
          }
          final Attribute relationship =
              event.asStartElement().getAttributeByName(QName.valueOf(Constants.ATTR_RELATIONSHIP));
          if (relationship != null) {
            link.setRelationship(relationship.getValue());
          }
          final Attribute target = event.asStartElement().getAttributeByName(QName.valueOf(Constants.ATTR_TARGET));
          if (target != null) {
            link.setTarget(URI.create(target.getValue()));
          }

          if (linkQName.equals(event.asStartElement().getName())) {
            delta.getAddedLinks().add(link);
          } else {
            delta.getDeletedLinks().add(link);
          }
        }
      }

      if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) {
        foundEndFeed = true;
      }
    }

    return delta;
  }