package com.ctp.cdi.query.audit;
import java.util.Collections;
import java.util.Set;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Inject;
import org.jboss.solder.properties.Property;
import org.jboss.solder.properties.query.AnnotatedPropertyCriteria;
import org.jboss.solder.properties.query.PropertyQueries;
import org.jboss.solder.properties.query.PropertyQuery;
import org.jboss.solder.reflection.AnnotationInstanceProvider;
class PrincipalProvider extends AuditProvider {
@Inject
private BeanManager manager;
@Override
public void prePersist(Object entity) {
updatePrincipal(entity);
}
@Override
public void preUpdate(Object entity) {
updatePrincipal(entity);
}
private void updatePrincipal(Object entity) {
PropertyQuery<Object> query = PropertyQueries.<Object>createQuery(entity.getClass())
.addCriteria(new AnnotatedPropertyCriteria(ModifiedBy.class));
for (Property<Object> property : query.getWritableResultList()) {
setProperty(entity, property);
}
}
private void setProperty(Object entity, Property<Object> property) {
try {
Object value = resolvePrincipal(entity, property);
property.setValue(entity, value);
log.debugv("Updated {0} with {1}", propertyName(entity, property), value);
} catch (Exception e) {
throw new AuditPropertyException("Failed to write principal to " +
propertyName(entity, property), e);
}
}
private Object resolvePrincipal(Object entity, Property<Object> property) {
AnnotationInstanceProvider provider = new AnnotationInstanceProvider();
CurrentUser principal = provider.get(CurrentUser.class, Collections.<String, Object>emptyMap());
Class<?> propertyClass = property.getJavaClass();
Set<Bean<?>> beans = manager.getBeans(propertyClass, principal);
if (!beans.isEmpty() && beans.size() == 1) {
Bean<?> bean = beans.iterator().next();
Object result = manager.getReference(bean, propertyClass,
manager.createCreationalContext(bean));
return result;
}
throw new IllegalArgumentException("Principal " + (beans.isEmpty() ? "not found" : "not unique") +
" for " + propertyName(entity, property));
}
}