Is it possible to get particular column data in an ArrayList or in Collection from <p:dataTable>

Hi to all,
Hope you all will be fine. I am new to JSF. I have a <p:table> like this.

....
<ppctu:dataTable  value="#{faqCategory.faqCategory}" var="Faq"
                                          selection="#{faqCategory.selectedFaqCetagory}"
                                          emptyMessage="No Faq Category found with given criteria" 
                                          widgetVar="portalsTable" rows="8" height="350" paginator="true"
                                          selectionMode="single"
                                          binding="#{faqCategory.table}">
                        
                             <ppctu:column filterBy="#{Faq.faqCategoryName}"
                                           headerText="Category Name"
                                           filterMatchMode="contains">
                             
                                 <h:commandLink value="#{Faq.faqCategoryName}"
                                                action="#{faqCategory.viewCategory()}"
                                                style="color: #0d5b7f;" >
                          
                                     <f:param name="id" value="#{Faq.faqCategoryId}" />
                                 
                                 </h:commandLink>
                             
                             </ppctu:column>
                             
                             <ppctu:column headerText="Action" >
                             
                                 <h:commandLink action="#{faqCategory.updateCategory}"
                                                value="update"
                                                title="Update FAQ Category"
                                                style="color: #0d5b7f;text-decoration: underline" >
                             
                                     <f:param name="id" value="#{Faq.faqCategoryId}" />
                                 
                                 </h:commandLink>
                                 
                                   
                                 
                                 <h:commandLink action="#{faqCategory.deleteCategory}"
                                                value="delete"
                                                title="Delete FAQ Category"
                                                style="color: #0d5b7f;text-decoration: underline" >
                                 
                                     <f:param name="id" value="#{Faq.faqCategoryId}" />
                                 
                                 </h:commandLink>
                             
                             </ppctu:column>
                        
                        </ppctu:dataTable>
                        
                    </ppctu:panel>

.....

public class FaqCategory_Review implements Serializable {

//Declare List that holds FaqCategory objects only. (Use of Generics)
    private List<FaqCategory> faqCategory;

public List<FaqCategory> getFaqCategory() {
        return faqCategory;
    }

/** Creates a new instance of FaqCategory_Review */
    public FaqCategory_Review() {
        
        //Creates ArrayList with initial default capacity 10.
        faqCategory = new ArrayList<FaqCategory>();
        getFaqCategoryGrid();
        
    } //end of constructor

private void getFaqCategoryGrid() {
        
        int portalID = 1;
        ArrayList2d<Object> portalData = new ArrayList2d<Object>();
        portalData.addRow();
        portalData.add(portalID);

ArrayList returnedFaqCategoryGrid = (ArrayList) faqCategoryManagement.getFAQCategoryGrid(portalData);
        
        if (Integer.parseInt(returnedFaqCategoryGrid.get(0).toString()) == 0) {
        
            
            //for(ArrayList returnRecord : returnedFaqCategoryGrid) {
                
               // faqCategory.add(new FaqCategory(Integer.parseInt(returnRecord.get(0).toString()), returnRecord.get(1).toString(), Integer.parseInt(returnRecord.get(2).toString())));
                   
           // } //end of for()
            
            for (int i = 1; i < returnedFaqCategoryGrid.size(); i++) {
                
                ArrayList returnRecord = (ArrayList) returnedFaqCategoryGrid.get(i);
                
                faqCategory.add(new FaqCategory(Integer.parseInt(returnRecord.get(0).toString()), returnRecord.get(1).toString(), Integer.parseInt(returnRecord.get(2).toString())));
                  
            } //end of for()
        
        } //end of if()
        
    } //end of getFaqCategoryGrid()

} //end of class FaqCategory_Review

when table is first loaded it contains entries from Database. Now i want when someone try to add CategoryName to the table , then the Table must not contain the added category. Means there must be no duplicate in the table.

So i want to ask is it possible that when some one try to add category to the table then instead of checking from database table first i get the records of columns CategaryName from the p:dataTable using TableModel?
Like i get all the names under CategaryNames column in an ArrayList and then check the new entered Category against all the entries, and if match exist then i return message that entry already exist in the table.
Actually i just want to ask is it possible to get records of particular columns from p:databale in an ArrayList or Collection using TableModel.

Thanks.