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https://issues.apache.org/jira/browse/TAP5-2389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jochen Kemnade updated TAP5-2389:
---------------------------------
Issue Type: Improvement (was: Bug)
> [tapestry-jpa] Better EntityPersistentFieldStrategy that can persist
> transient entity
> -------------------------------------------------------------------------------------
>
> Key: TAP5-2389
> URL: https://issues.apache.org/jira/browse/TAP5-2389
> Project: Tapestry 5
> Issue Type: Improvement
> Components: tapestry-jpa
> Affects Versions: 5.4
> Reporter: Charles Capon
> Labels: jpa
>
> I'm using tapestry-jpa and I want to persist an entity that can be transient
> or not in a component.
> There is an issue with transient entities because they can not be persisted
> without an exception to be raised.
> Here is a code of a better EntityPersistentFieldStrategy that can persist
> transient and managed entity
> {code:title=EntityPersistentFieldStrategy.java|borderStyle=solid}
> public class EntityPersistentFieldStrategy extends
> AbstractSessionPersistentFieldStrategy {
> private final static String PREFIX = "entity:";
> private final EntityManagerManager entityManagerManager;
> public EntityPersistentFieldStrategy(final EntityManagerManager
> entityManagerManager,
> final Request request) {
> super(PREFIX, request);
> this.entityManagerManager = entityManagerManager;
> }
> @Override
> protected Object convertApplicationValueToPersisted(final Object
> newValue) {
> try {
> return
> JpaInternalUtils.convertApplicationValueToPersisted(entityManagerManager,
> newValue);
> } catch (final RuntimeException ex) {
> return super.convertApplicationValueToPersisted(newValue);
> }
> }
> @Override
> protected Object convertPersistedToApplicationValue(final Object
> persistedValue) {
> if (persistedValue instanceof PersistedEntity) {
> final PersistedEntity persisted = (PersistedEntity)
> persistedValue;
> return persisted.restore(entityManagerManager);
> } else {
> return super.convertPersistedToApplicationValue(persistedValue);
> }
> }
> }
> {code}
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