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Reinier Zwitserloot
84 lines
3.9 KiB
HTML
84 lines
3.9 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<link rel="stylesheet" type="text/css" href="../logi/reset.css" />
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<link rel="stylesheet" type="text/css" href="features.css" />
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<link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
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<meta name="description" content="Spice up your java" />
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<title>@Delegate</title>
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</head><body><div id="pepper">
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<div class="minimumHeight"></div>
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<div class="meat">
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<div class="header"><a href="../index.html">Project Lombok</a></div>
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<h1>@Delegate</h1>
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<div class="byline">Don't lose your composition.</div>
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<div class="overview">
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<h3>Overview</h3>
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<p>
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<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
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that forward the call to this field (or the result of invoking this method).
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</p>
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<p>
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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
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methods declared in <code>java.lang.Object</code>.
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</p>
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<p>
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You can pass any number of classes into the <code>@Delegate</code> annotation's <code>types</code> parameter.
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If you do that, then lombok will delegate all <code>public</code> methods in those types (and their supertypes, except
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<code>java.lang.Object</code>) instead of looking at the field/method's type.
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</p>
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<p>
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All public non-<code>Object</code> methods that are part of the calculated type(s) are
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copied, whether or not you also wrote implementations for those methods. That would thus result in duplicate method errors. You can avoid these
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by using the <code>@Delegate(excludes=SomeType.class)</code> parameter to exclude all public methods in the excluded type(s), and their supertypes.
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</p>
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<p>
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To have very precise control over what is delegated and what isn't, write private inner interfaces with method signatures, then specify these
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private inner interfaces as types in <code>@Delegate(types=PrivateInnerInterfaceWithIncludesList.class, excludes=SameForExcludes.class)</code>.
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</p>
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</div>
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<div class="snippets">
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<div class="pre">
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<h3>With Lombok</h3>
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<div class="snippet">@HTML_PRE@</div>
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</div>
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<div class="sep"></div>
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<div class="post">
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<h3>Vanilla Java</h3>
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<div class="snippet">@HTML_POST@</div>
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</div>
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</div>
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<div style="clear: left;"></div>
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<div class="overview">
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<h3>Small print</h3><div class="smallprint">
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<p>
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When passing classes to the annotation's <code>types</code> or <code>excludes</code> parameter, you cannot include generics.
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This is a limitation of java. Use private inner interfaces or classes that extend the intended type including the
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generics parameter to work around this problem.
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</p>
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<p>
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When passing classes to the annotation, these classes do not need to be supertypes of the field. See the example.
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</p>
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<p>
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<code>@Delegate</code> cannot be used on static fields or methods.
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<div>
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</div>
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<div class="footer">
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<a href="index.html">Back to features</a> | <a href="val.html">Previous feature (val)</a> | <span class="disabled">Next feature</span><br />
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2010-2011 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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<div style="clear: both;"></div>
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