I am trying to validate a list of entry by using the EntityManager to query the
database to check limits. I can also see myself using this for a list of
tracking numbers like on UPS as well. For each I would like to hit the DB and
see if it meets my criteria and give a meaninful message to the user next to
each field. I have this working and the EntityManager is accessable from my
Converter, but I need additional information besides this value to do my checks
in this case. It is present in the DataModel that this field is coming from,
but I am unsure of the best way to get accesss to this once inside the
converter. Any advice would be greatly appreciated.
As a minimum for this case I need to know the pk of the item in question so I
can check its balance in the DB.
I have posted both the Java and Facelets code below with some comments.
Java Code
| @Stateless
| @Name("genericItemNumPieces")
| @Interceptors(SeamInterceptor.class)
| public class GenericItemNumPiecesConverterBean implements
GenericItemNumPiecesConverterInterface
| {
| @Logger private Log log;
|
| @PersistenceContext
| EntityManager em;
|
| public Converter getConverter() {
| return new GenericItemNumPiecesConverter(em, log);
| }
|
| public static class GenericItemNumPiecesConverter implements Converter {
|
| private EntityManager em;
| private Log log;
|
| public GenericItemNumPiecesConverter(EntityManager em, Log log) {
| this.log=log;
| this.em=em;
| }
|
| public String getAsString(FacesContext facesContext, UIComponent
component, Object obj) {
| if (obj == null) return null;
| Long numPieces = (Long) obj;
| String val = Long.toString(numPieces);
| return val;
| }
|
| public Object getAsObject(FacesContext facesContext, UIComponent
component, String str)
| throws ConverterException {
| // This is just to test the log and entity manager.
| // But I need to access the row of the datatable this component is in
| // so that I can verify the quantity.
| List list = em.createQuery("from Size s").getResultList();
| log.info("There are " + list.size() + " sizes");
|
| // Check if the value entered is parsable as a Long. If not it
throws ConverterException
| Long numPieces = parseLong(str);
|
| // Check if quantiy is positive.
| if (numPieces < 0) throwConverterException();
|
| // What I would like to do here is verify against the DB to see if
the quantity is <= the number
| // of pieces available and throw new ConverterException(new
FacesMessage("The number of pieces must be <= X"))
| // How can I access the row from the datatable that this component is
located in so that I can
| // check the quantity for the proper line item?
| return numPieces;
| }
| }
|
| private static Long parseLong(String str) {
| Long numPieces = null;
| try {
| numPieces = Long.valueOf(str).longValue();
| } catch (NumberFormatException e) {
| throwConverterException();
| }
| return numPieces;
| }
|
| private static void throwConverterException() {
| throw new ConverterException(new FacesMessage("The number of pieces
must be >= 0."));
| }
| }
|
Facelets code
<t:dataTable id="#{dataTableId}"
| var="couplingL"
| rowIndexVar="rowIndex"
| rows="20" preserveSort="true"
| value="#{couplingList}">
| <t:column styleClass="paddlr alignr">
| <f:facet name="header">Qty Rec</f:facet>
| <h:inputText id="recList_#{rowIndex}"
| value="#{couplingL.numPiecesInput}"
| converter="#{genericItemNumPieces.converter}" />
| <h:messages for="recList_#{rowIndex}" />
| </t:column>
| </t:dataTable>
|
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