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<div class="subTitle">com.amazon.carbonado</div>
<h2 title="Annotation Type Derived" class="title">Annotation Type Derived</h2>
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<pre>@Documented
@Retention(value=RUNTIME)
@Target(value=METHOD)
public @interface <span class="strong">Derived</span></pre>
<div class="block">Identifies a <a href="../../../com/amazon/carbonado/Storable.html" title="interface in com.amazon.carbonado"><code>Storable</code></a> property which is not directly persisted, but
is instead derived from other property values. A derived property cannot be
abstract, and a "set" method is optional.
<p>Derived properties can be used just like a normal property in most
cases. They can be used in query filters, indexes, alternate keys, and they
can also be used to define a <a href="../../../com/amazon/carbonado/Version.html" title="annotation in com.amazon.carbonado"><code>Version</code></a> property.
<p>If the derived property depends on <a href="../../../com/amazon/carbonado/Join.html" title="annotation in com.amazon.carbonado"><code>Join</code></a> properties and is also
used in an index or alternate key, dependencies must be listed in order for
the index to be properly updated.
<p>Example:<pre>
@Indexes(@Index("uppercaseName"))
public abstract class UserInfo implements Storable<UserInfo> {
/**
* Derive an uppercase name for case-insensitive searches.
*/
<b>@Derived</b>
public String getUppercaseName() {
String name = getName();
return name == null ? null : name.toUpperCase();
}
...
}
</pre></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.2</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Brian S O'Neill, Tobias Holgers</dd></dl>
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<caption><span>Optional Elements</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Optional Element and Description</th>
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<td class="colFirst"><code>java.lang.String[]</code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/Derived.html#from()">from</a></strong></code>
<div class="block">List of properties that this property is derived from.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/amazon/carbonado/Derived.html#shouldCopy()">shouldCopy</a></strong></code>
<div class="block">Returns whether this property should be included when copying a
storable.</div>
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<pre>public abstract java.lang.String[] from</pre>
<div class="block">List of properties that this property is derived from.</div>
<dl>
<dt>Default:</dt>
<dd>{}</dd>
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<pre>public abstract boolean shouldCopy</pre>
<div class="block">Returns whether this property should be included when copying a
storable. Copying of a derived property uses the "get" and "set" methods
and requires the "set" method to be defined. Default false.</div>
<dl>
<dt>Default:</dt>
<dd>false</dd>
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