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POHow to implement GWT editors for subclasses of a type?
 

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    <p>Let's say I have an object hierarchy like this:</p> <p><strong>Account > Site > Supply</strong></p> <p>An Account is an actual company, a Site is a building they have, and a Supply is either an <code>ElecSupply</code> or <code>GasSupply</code>. Supply is never instantiated and could be an abstract class in theory.</p> <p>I am using Objectify for persistence, and have a page that displays the list of Supplies for each Site, regardless of whether they are an <code>ElecSupply</code> or <code>GasSupply</code>.</p> <p>Now I am implementing the <a href="https://developers.google.com/web-toolkit/doc/latest/DevGuideUiEditors" rel="nofollow">GWT Editor Framework</a> and have come up against a problem with this polymorphic entity. How do I implement an Editor and set of sub-editors for an object like this?</p> <pre><code>@Entity public class Supply implements Serializable { @Id protected Long id; @Embedded protected List&lt;BillingPeriod&gt; billingPeriods = new ArrayList&lt;BillingPeriod&gt;(); public Supply() { } // ... } </code></pre> <p>The subclasses: (ElecSupply has 5 unique fields and GasSupply has just one)</p> <pre><code>@Subclass public class ElecSupply extends Supply implements Serializable { private String profile; private String mtc; private String llf; private String area; private String core; public ElecSupply() { } } </code></pre> <hr> <pre><code>@Subclass public class GasSupply extends Supply implements Serializable { private String mpr; public GasSupply() { } // ... } </code></pre> <p>So I would like to know if anyone has any experience with this kind of structure? I have tried to make separate editors for <code>ElecSupply</code> and <code>GasSupply</code>, and then show or hide them as part of the edit page.</p> <p>The other way I was thinking about doing it would be to have a single editor (for Supply), and then load different sub-editors depending on which type of object we are editing.</p> <p>Any light shed will be gratefully received.</p>
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