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- <div class="meat">
- <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>
- </div>
- <div class="snippets">
- <div class="pre">
- <h3>With Lombok</h3>
- <div class="snippet">@HTML_PRE@</div>
- </div>
- <div class="sep"></div>
- <div class="post">
- <h3>Vanilla Java</h3>
- <div class="snippet">@HTML_POST@</div>
- </div>
- </div>
- <div style="clear: left;"></div>
- <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.
- </p>
- </div>
- </div>
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- <a href="index.html">Back to features</a> | <a href="Log.html">Previous feature (@Log)</a> | <span class="disabled">Next feature</span><br />
- <a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright &copy; 2010-2013 The Project Lombok Authors, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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