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<title>@Delegate</title>
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<div class="header"><a href="../index.html">Project Lombok</a></div>
<h1>@Delegate</h1>
<div class="byline">Don't lose your composition.</div>
<div class="overview">
<h3>Overview</h3>
<p>
<em> NEW IN Lombok 0.10: </em> Any field or no-argument method can be annotated with <code>@Delegate</code> to let lombok generate delegate methods
that forward the call to this field (or the result of invoking this method).
</p>
<p>
Lombok delegates all <code>public</code> methods of the field's type (or method's return type), as well as those of its supertype except for all
methods declared in <code>java.lang.Object</code>.
</p>
<p>
You can pass any number of classes into the <code>@Delegate</code> annotation's <code>types</code> parameter.
If you do that, then lombok will delegate all <code>public</code> methods in those types (and their supertypes, except
<code>java.lang.Object</code>) instead of looking at the field/method's type.
</p>
<p>
All public non-<code>Object</code> methods that are part of the calculated type(s) are
copied, whether or not you also wrote implementations for those methods. That would thus result in duplicate method errors. You can avoid these
by using the <code>@Delegate(excludes=SomeType.class)</code> parameter to exclude all public methods in the excluded type(s), and their supertypes.
</p>
<p>
To have very precise control over what is delegated and what isn't, write private inner interfaces with method signatures, then specify these
private inner interfaces as types in <code>@Delegate(types=PrivateInnerInterfaceWithIncludesList.class, excludes=SameForExcludes.class)</code>.
</p>
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<h3>With Lombok</h3>
<div class="snippet">@HTML_PRE@</div>
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<h3>Vanilla Java</h3>
<div class="snippet">@HTML_POST@</div>
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<div class="overview">
<h3>Small print</h3><div class="smallprint">
<p>
When passing classes to the annotation's <code>types</code> or <code>excludes</code> parameter, you cannot include generics.
This is a limitation of java. Use private inner interfaces or classes that extend the intended type including the
generics parameter to work around this problem.
</p>
<p>
When passing classes to the annotation, these classes do not need to be supertypes of the field. See the example.
</p>
<p>
<code>@Delegate</code> cannot be used on static fields or methods.
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