ElementOutlineImpl omits serialVersionUID and proposed fix

[patrodyne]

ISSUE

The ElementOutlineImpl class omits the serialVersionUID field when specified by

<jaxb:globalBindings>
    <jaxb:serializable uid="20231001" />
</jaxb:globalBindings>

PROPOSAL

Add a method to ElementOutlineImpl to implement the serializable option and call the method at the start of the if(ei.hasClass()) {...} block.

Method: serializableOption(...)

/**
 * Serializable option to implement the {@link Serializable} interface
 * and <code>serialVersionUID</code> field.
 *
 * @param bg The XJC bean generator.
 * @param implClass The implementation class.
 */
private void serializableOption(BeanGenerator bg, JDefinedClass implClass)
{
    if (bg.getModel().serializable)
    {
        JClass serRef = bg.getCodeModel().ref(Serializable.class);
        if ( !serRef.isAssignableFrom(implClass) )
            implClass._implements(Serializable.class);

        if ( !implClass.fields().containsKey("serialVersionUID") )
        {
            if (bg.getModel().serialVersionUID != null)
            {
                implClass.field(
                    JMod.PRIVATE | JMod.STATIC | JMod.FINAL,
                    bg.getCodeModel().LONG,
                    "serialVersionUID",
                    JExpr.lit(bg.getModel().serialVersionUID));
            }
        }
    }
}