Example usage for javax.persistence.metamodel EntityType hasSingleIdAttribute

Introduction

In this page you can find the example usage for javax.persistence.metamodel EntityType hasSingleIdAttribute.

Prototype

boolean hasSingleIdAttribute();

Source Link

Document

Whether the identifiable type has a single id attribute.

Usage

From source file:org.apache.click.extras.jpa.JpaForm.java

/**
 * Create a new JpaForm with the given form name and value object
 * class.//from w w w. j  a v a2  s  .  co  m
 *
 * @param name the form name
 * @param valueClass the value object class
 */
public JpaForm(String name, Class valueClass) {
    super(name);

    if (valueClass == null) {
        throw new IllegalArgumentException("Null valueClass parameter");
    }

    classField = new HiddenField(FO_CLASS, String.class);
    classField.setValue(valueClass.getName());
    add(classField);

    /*
    String classname = getClassname(valueClass);
            
    ClassMetadata classMetadata =
    ((HibernateEntityManagerFactory)getEntityManagerFactory()).getSessionFactory().getClassMetadata(classname);
            
    Type identifierType = classMetadata.getIdentifierType();
    oidField = new HiddenField(FO_ID, identifierType.getReturnedClass());
    add(oidField);
     */

    Metamodel classMetadata = getEntityManager().getMetamodel();
    EntityType entityType = classMetadata.entity(valueClass);
    //Whether the identifiable type has a single id attribute.
    if (entityType.hasSingleIdAttribute()) {
        oidField = new HiddenField(FO_ID, entityType.getIdType().getJavaType());
    } else {
        throw new IllegalArgumentException("The identifiable type is idclass attribute, the form won't work!");
    }
    add(oidField);

}

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From source file:org.apache.openejb.util.proxy.QueryProxy.java

private void remove(final Object[] args, final Class<?> returnType) {
    if (args != null && args.length == 1 && returnType.equals(Void.TYPE)) {
        Object entity = args[0];//  www  .  ja  va2s.  c  o  m
        if (!em.contains(entity)) { // reattach the entity if possible
            final Class<?> entityClass = entity.getClass();
            final EntityType<? extends Object> et = em.getMetamodel().entity(entityClass);

            if (!et.hasSingleIdAttribute()) {
                throw new IllegalArgumentException("Dynamic EJB doesn't manage IdClass yet");
            }

            SingularAttribute<?, ?> id = null; // = et.getId(entityClass); doesn't work with openJPA
            for (final SingularAttribute<?, ?> sa : et.getSingularAttributes()) {
                if (sa.isId()) {
                    id = sa;
                    break;
                }
            }
            if (id == null) {
                throw new IllegalArgumentException("id field not found");
            }
            final String idName = id.getName();

            final Object idValue;
            try {
                idValue = BeanUtils.getProperty(entity, idName);
            } catch (final InvocationTargetException e) {
                throw new IllegalArgumentException("can't invoke to get entity id");
            } catch (final NoSuchMethodException e) {
                throw new IllegalArgumentException("can't find the method to get entity id");
            } catch (final IllegalAccessException e) {
                throw new IllegalArgumentException("can't access field/method to get entity id");
            }

            entity = em.getReference(et.getJavaType(), idValue);
            if (entity == null) {
                throw new IllegalArgumentException("entity " + entity + " is not managed and can't be found.");
            }
        }
        em.remove(entity);
    } else {
        throw new IllegalArgumentException(REMOVE_NAME + " should have only one parameter and return void");
    }
}

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