Can someone comment what this if statements are doing in this method?

Can someone comment what this if statements are doing in this method?
public Attribute[] saveLab(Lab lab) throws ManagementSupportException {
             // creating "request" object using service's method
            TEServiceStub.SaveLab request = new TEServiceStub.SaveLab();

            TEServiceStub.AttributeArray array = new TEServiceStub.AttributeArray();
            List<TEServiceStub.Attribute> attrs = new ArrayList<TEServiceStub.Attribute>();

            if(lab.getId() > 0) {
                  TEServiceStub.Attribute attr = new TEServiceStub.Attribute();
                  attr.setName("LAB_ID");
                  attr.setValue(String.valueOf(lab.getId()));
                  attrs.add(attr);
            }

            if(lab.getDescription() != null && lab.getDescription().length() > 0) {
                  TEServiceStub.Attribute attr = new TEServiceStub.Attribute();
                  attr.setName("DESCRIPTION");
                  attr.setValue(lab.getDescription());
                  attrs.add(attr);
            }

            if(lab.getLocation() != null && lab.getLocation().length() > 0) {
                  TEServiceStub.Attribute attr = new TEServiceStub.Attribute();
                  attr.setName("LOCATION");
                  attr.setValue(lab.getLocation());
                  attrs.add(attr);
            }

            if(lab.getOwner() != null && lab.getOwner().length() > 0) {
                  TEServiceStub.Attribute attr = new TEServiceStub.Attribute();
                  attr.setName("OWNER");
                  attr.setValue(lab.getOwner());
                  attrs.add(attr);
            }
            array.setAttributes((TEServiceStub.Attribute[]) attrs.toArray());

            request.setAttributes(array);
            // declaring "response" object
            TEServiceStub.SaveLabResponse response = null;
            try {
                  // invoking web service's method
                  response = stub.saveLab(request);
            } catch (RemoteException e) {
                  logger.warn("Fail to call TEService :" + e);
                  throw new ManagementSupportException("Fail to call TEService :" + e);
            }
            // processing "response" object
            if(!response.getStatus().getSuccess()) {
                  logger.warn("TEService return failure while call saveLab()");
                  throw new ManagementSupportException("TEService return failure while call saveLab()");
            }

            return cast(response.getAttributes());
      }