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<h1 class="page">Business Rules</h1>
<div class="paragraph">
<p>When a domain object is rendered in the UI or the end-user interacts with the domain object through the UI, the framework applies a series of precondition business rules to each object member (property, collection or action).</p>
</div>
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<p>When the object is being rendered, the framework checks:</p>
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<li>
<p>is the object member visible?</p>
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<p>Members that are not visible are simply omitted from the page.
If all the members in a fieldset (property group) are hidden, then the fieldset is not shown.
If all the members in a tab are hidden, then the tab is not shown.
If all the members of the object are hidden, then a "404" style message ("no such object") is returned to the user.</p>
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<p>if the object member is visible, is the object member enabled?</p>
<div class="paragraph">
<p>An enabled property can be edited (otherwise it is read-only), and an enabled action can be invoked (otherwise it&#8217;s button is "greyed-out").
Note that collections are always read-only.</p>
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</li>
<li>
<p>for enabled object members, if the user then interacts with that member, are the supplied values valid (can the user "do it").</p>
<div class="paragraph">
<p>For an editable property this means validating the proposed new value of the property.
For an invokable action this means validating that arguments being used to invoke the action.</p>
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<p>One way to remember this is: <strong>"see it, use it, do it"</strong></p>
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<div class="title">See it, use it, do it</div>
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<li>
<p>is the object member visible?</p>
</li>
<li>
<p>if so, is the object member enabled?</p>
</li>
<li>
<p>if so, are the supplied values valid? (can the user "do" it)?</p>
</li>
</ul>
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<div class="paragraph">
<p>The framework provides a multitude of ways to implement these business rules.
The simplest approach is to just implement the business rules imperatively in the domain object, using a supporting method.
For example,</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public Customer placeOrder(Product p, int quantity) {
// ...
}
public boolean hidePlaceOrder() { <i class="conum" data-value="1"></i><b>(1)</b>
return isBlacklisted();
}</code></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>supporting method, invoked before rendering the customer.</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>In this example the "place order" action would not be visible for any customer that had been blacklisted.</p>
</div>
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<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
<div class="paragraph">
<p>Details on how to actually write business rules (the programming model) can be found <a href="../business-rules.html" class="page">here</a>.</p>
</div>
</td>
</tr>
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