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A p p l y i n g J S F : I n t r o d u c i n g t h e Vi r t u a l Tr a i n e r A p p l i c a t i o n
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<h:dataTable id="eventsTable" value="#{Main_BackingtrainingEventsForUser}"
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As you saw before, the implementation for the method getTrainingEventsForUser( ) gets an unsorted List of training events based on the userid of the user To implement sorting, this method would call a sort( ) method that sorts the List before returning it back to the user Again, to review the code for getTrainingEventsForUser( )
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public List getTrainingEventsForUser(){ // Get training events for this user, or all if user is a trainer // Initialization code omitted for brevity // If user is a trainer, return all Training Events, // else only return events for user if (managedUserBeanisTrainer()) userEventList = eventRegistrygetAllEvents(); else { // is not a trainer so call getEventlistForUser userEventList = eventRegistrygetEventlistForUser(userid); } // New! Sort event list sortEvents(userEventList); return userEventList; }
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PART II
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As you can see, at the end of the method, just before returning the List of events to the user, it is sorted using a sortEvents( ) method The implementation of this method is somewhat similar to before in that it has a switch statement that determines which column to sort by It differs from there Instead of calling a data-tier method to get the sorted data, it calls some local methods to sort the data using Comparators Notice that a conditional expression is used to evaluate whether an ascending or descending Comparator based on the boolean sort order flag (sortEventAsc, sortDateAsc, and so on) is sent to the Collectionssort( ) method
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private void sortEvents(List TrainingEvents){ switch (sortBy){ case SORT_BY_EVENT: Collectionssort(TrainingEvents, sortEventAsc SortTrainingEventAscComparator : SortTrainingEventDescComparator); break; case SORT_BY_DATE: Collectionssort(TrainingEvents, sortDateAsc SortDateAscComparator : SortDateDescComparator); break; // and so on for each column
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default : break; } }
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The topic of Comparators is slightly beyond the scope of this book, but it is easy to see how they operate The following is the code for the SortTrainingEventAscComparator
private static final Comparator SortTrainingEventAscComparator = new Comparator(){ public int compare(Object o1, Object o2){ String s1 = ((TrainingEvent)o1)getEname(); String s2 = ((TrainingEvent)o2)getEname(); return s1compareTo(s2); } };
And next is the code for the SortDateDescComparator:
private static final Comparator SortDateDescComparator = new Comparator(){ public int compare(Object o1, Object o2){ Date d1 = ((TrainingEvent)o1)getCompletionDate(); Date d2 = ((TrainingEvent)o2)getCompletionDate(); return d2compareTo(d1); } };
For this implementation, two Comparators would be needed per each column that needed sorting support (for ascending and descending) The Comparator simply provides a way to compare different objects This is then provided to the Collectionssort method The end result is a sorted Collection, or in this case a List object Now that we ve examined the code to sort data displayed in a dataTable, the following is a simple technique for providing the user with a visual cue regarding which column is being sorted, and in which direction
Displaying the Sort Behaviors in the Column Header
Indicating which column is being sorted and what direction it is, provides the user with a useful visual clue This is actually very easy to implement since the data is already available in the backing bean We merely need to display an appropriate image (or character) that is based on the values of the session-scoped sort variables We thus return to the event name column portion of the dataTable however, now you ll see an enhancement
9:
A p p l y i n g J S F : I n t r o d u c i n g t h e Vi r t u a l Tr a i n e r A p p l i c a t i o n
<h:column> <f:facet name="header"> <h:panelGroup> <h:commandLink actionListener="#{Main_BackingsortByEvent}" immediate="true"> <h:outputText value="Event Name"/> </h:commandLink> <h:graphicImage url="#{Main_BackingsortEventAsc '/images/arrow-upgif' : '/images/arrow-downgif'}" rendered="#{Main_BackingshowSortEventIcon}" height="13" width="9" /> </h:panelGroup> </f:facet> <h:outputText value="#{rowename}"/> </h:column>
PART II
The obvious enhancement is to add an image component and conditionally set both its rendered attribute based on whether this column was selected for sorting, as well as setting its url attribute to a conditional expression which derives the correct image based on the value boolean sort flag in this example, sortEventAsc The rendered attribute actually derives its value from a boolean getter method isShowSortEventIcon( ) on the backing bean, which is coded as:
public boolean isShowSortEventIcon() { showSortEventIcon = (sortBy == SORT_BY_EVENT); return (showSortEventIcon) ; }
This method returns true if the backing bean sortBy variable is equal to the SORT_BY_ EVENT static value, or in other words, if the Event Name column was selected for sorting Figure 9-21 displays the Training Events table with the Event Name column selected for sorting Subsequently, when the column header is clicked again, the directional arrow changes This is depicted in Figure 9-22
FIGURE 9-21
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