Filtering details in Master-Detail edit

In response to questions about the Seam Master-Detail editing approach that I described here, I have put together a couple of small enhancements that allow for filtering the Detail list within an instance of the Master. This might arise when working with a large list of Detail instances.

Add to MasterEditor.java:

private static final String EJB_QL = "SELECT d FROM Detail d " +
"WHERE d.master = ?1 AND d.detailDescription like ?2";
private Query detailQuery;
private String filterDescription;
public String getFilterDescription() { return this.filterDescription; }
public void setFilterDescription(String filterDescription) { this.filterDescription = filterDescription; }

@SuppressWarnings("unchecked")
public String filterDetails() {
detailQuery.setParameter(1, getInstance());
detailQuery.setParameter(2, this.filterDescription + "%");
detailListFromMaster = (List) detailQuery.getResultList();
return "success";
}

Add to the front-end:

<rich:panel>
   <f:facet name="header">Detail Filter</f:facet>

   <s:decorate id="detailDescriptionFilterField" template="layout/edit.xhtml">
       <ui:define name="label">Detail Description</ui:define>
       <h:inputText id="detailDescriptionFilter"
                    size="100"
               maxlength="100"
                   value="#{masterEditor.filterDescription}">
           <a:support event="onblur" reRender="detailDescriptionFilterField" bypassUpdates="true" ajaxSingle="true"/>
       </h:inputText>
   </s:decorate>

   <div class="actionButtons">

       <a:commandButton id="doFilter"
                   value="Search"
                  action="#{masterEditor.filterDetails()}"
                reRender="detailListTable">
           <s:conversationId />
       </a:commandButton>
   </div>
</rich:panel>

The "wire()" function links the detailListFromMaster to the embedded list of Detail instances from within the Master that we're editing. This can be problematic, because wire() is called as a page action. This means every resubmission will re-trigger the wire() function, effectively overwriting the filtering that we've done. In order to stop this, change the XXX.page.xml to use on-postback = false:

<action execute="#{masterEditor.wire}" on-postback="false"/>