Example usage for javax.persistence.metamodel SingularAttribute isOptional

Introduction

In this page you can find the example usage for javax.persistence.metamodel SingularAttribute isOptional.

Prototype

boolean isOptional();

Source Link

Document

Can the attribute be null.

Usage

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

/**
 * Applies the <tt>ClassMetadata</tt> validation database meta data to the
 * form fields./*from   w w  w .j  a va2  s  . co m*/
 * <p/>
 * The field validation attributes include:
 * <ul>
 * <li>required - is a mandatory field and cannot be null</li>
 * </ul>
 */
protected void applyMetaData() {
    if (metaDataApplied) {
        return;
    }

    try {
        Class valueClass = Class.forName(classField.getValue());

        /*
        String classname = getClassname(valueClass);
                
        Metamodel metadata =
        ((HibernateEntityManagerFactory) getEntityManagerFactory()).getSessionFactory().getMetamodel(classname);
                
        String[] propertyNames = metadata.getPropertyNames();
                
        boolean[] propertyNullability = metadata.getPropertyNullability();
                 
        for (int i = 0; i < propertyNames.length; i++) {
        Field field = getField(propertyNames[i]);
        if (field != null) {
            field.setRequired(propertyNullability[i]);
        }
        }
         */
        Metamodel classMetadata = getEntityManager().getMetamodel();
        EntityType entityType = classMetadata.entity(valueClass);

        Set<SingularAttribute> attrs = entityType.getAttributes();

        for (SingularAttribute a : attrs) {
            Field field = getField(a.getName());
            if (field != null) {
                field.setRequired(a.isOptional());
            }
        }
    } catch (ClassNotFoundException cnfe) {
        throw new RuntimeException(cnfe);
    }

    metaDataApplied = true;
}

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