How to add up all values in a datatable row primefaces Jsf - jsf

Question

i have a datatable :
<p:dataTable id="marksTable"
var="item"
value="#{markingBean.markToEdit}"
rowKey="#{markingBean.markToEdit}"
paginator="true" rows="10"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
rowsPerPageTemplate="5,10,15"
scrollable="true"
liveScroll="true"
scrollRows="20"
emptyMessage="No details was found with given criteria">
<p:column headerText="#{bundle.labelMarkSectionOne} ">
<h:outputText value="#{item.markSectionOne}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionTwo}">
<h:outputText value="#{item.markSectionTwo}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionThree}">
<h:outputText value="#{item.markSectionThree}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionFour}">
<h:outputText value="#{item.markSectionFour}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionFive}">
<h:outputText value="#{item.markSectionFive}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionSix}">
<h:outputText value="#{item.markSectionSix}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionSeven}">
<h:outputText value="#{item.markSectionSeven}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionEight}">
<h:outputText value="#{item.markSectionEight}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionNine}">
<h:outputText value="#{item.markSectionNine}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionTen}">
<h:outputText value="#{item.markSectionTen}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionEleven}">
<h:outputText value="#{item.markSectionEleven}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionTwelve}">
<h:outputText value="#{item.markSectionTwelve}" />
</p:column>
<p:column headerText="#{bundle.labelMarkSectionThirteen}">
<h:outputText value="#{item.markSectionThirteen}" />
</p:column>
</p:dataTable>
this will only show one row, what i want to do is simply add up all these values and then take the average
how best can i do this ?
EDIT
as request
The data is retrived from a database where all values are stored, in the data table it only displays one row from the db one pre selected before hand
This is the marking bean
#Named(value = "markingBean")
#ViewScoped
//#RequestScoped
public class MarkingController {
private String searchString;
private String ordering;
private String criteria;
private String match;
private Date today;
private String caseMatch;
private Boolean changed;
//private Marking markSectionOne;
// private Marking studentNumber;
// private Marking markSectionTwo;
// private Marking markToEdit;
private int spinnerField;
private Marking markToCreate, markToEdit;
private String searchMark;
private List<Marking> userSearchResults;
private List<Marking> marksList;
private Person user;
private Progress progress;
private Marking marking;
private Boolean isCompleted;
private String disabled;
private boolean value1;
private boolean value2;
private List<String> selectedOptions;
private Integer option;
private Integer number;
private List<Marking> totalMark;
#Inject
PersonFacade personFacade;
#Inject
CohortFacade cohortFacade;
#Inject
MilestoneFacade milestoneFacade;
#Inject
ProjectFacade projectFacade;
#Inject
ProgressFacade progressFacade;
#Inject
MilestoneService milestoneService;
#Inject
MarkingFacade markingFacade;
#Inject
MarkingService markingService;
#PostConstruct
public void init() {
this.markToCreate = new Marking();
this.marking = new Marking();
this.marksList = markingFacade.findAll();
// totalMark = mark.list();
changed = false; //required otherwise will work opposite of how we want
String username = FacesContext.getCurrentInstance().getExternalContext().getUserPrincipal().getName();
// Get the logged in user
List<Person> usernameSearchResults = this.personFacade.usernameSearch(FacesContext.getCurrentInstance().getExternalContext().getUserPrincipal().getName());
if (usernameSearchResults.size() > 0) {
this.user = usernameSearchResults.get(0);
}
String marking_id = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("edit_id");
System.out.println(marking_id);
if (marking_id != null) {
this.markToEdit = this.markingFacade.find(Long.parseLong(marking_id));
}
}
public void createMarkingOne() {
System.out.println("in Create mark one");
this.markingService.createMarking(this.markToCreate);
// this.markingFacade.create(this.markToCreate);
this.setMessage(" saved");
}
public void createMarking() {
System.out.println("in Create mark");
this.markingService.createMarking(this.markToCreate);
// this.markingFacade.create(this.markToCreate);
this.setMessage(" saved");
}
private void setMessage(String message) {
FacesContext fc = FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage(message, ""));
}
/* Delete mark*/
public void deleteMark(Marking markToDelete) {
/* this.markingService.deleteMark(markToDelete);
listMarks(); //need to add the list marks function
this.setMessage("Mark has been deleted.");*/
//this.markingFacade.remove(this.marking_id);
}
// Edit existing marks
public void editMark() throws IOException {
System.out.println("in edit mark");
this.markingFacade.edit(this.markToEdit);
this.setMessage("Mark(s) for the project has been successfully been recorded.");
MarkingLog loadProp = new MarkingLog(); // re anable for testing when finished
loadProp.loadProp();
}
public void addMessage(boolean markingCompleted) {
String summary = markingCompleted ? "Checked" : "Unchecked";
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(summary));
}
public void editChange() {
changed = true;
}
/**
* SEARCHES *
*/
//for the advanced search query
public void basicMarkingSearch() {
userSearchResults = markingFacade.basicMarkingSearch(searchString, criteria, ordering, match);
}
public void testMarkingSearch() {
userSearchResults = markingFacade.testMarkingSearch(searchString, ordering, match);
}
Marking entity
#Entity(name = "MARKING")
public class Marking implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#ManyToOne
private Person marker;
#ManyToOne
private Project project;
// #ManyToOne
// private Project project;
//#ManyToMany(mappedBy = "title")
//private Project projectBeMarked;
private String markingCompleted, markSectionOne, markSectionTwo, markSectionThree, markSectionFour,
markSectionFive, markSectionSix, markSectionSeven, markSectionEight,
markSectionNine, markSectionTen, markSectionEleven, markSectionTwelve, markSectionThirteen, markAdjust, overalMark, thirdMarker, plagorism;
What i am trying to do, is add up a row markSectionOne to Thirteen and then take the average and display this to the user