mirror of
https://github.com/tiennm99/lombok.git
synced 2026-10-14 00:16:47 +00:00
Added documentation for @RequiredArgsConstructor, @NoArgsConstructor, @AllArgsConstructor, and also how these generate @ConstructorProperties annotations.
Also updated @Getter and @Setter's documentation to explain their new class-level feature, and updated @Data's description to highlight how @Data is now truly nothing more than the combination of @RequiredArgsConstructor, @EqualsAndHashCode, @ToString, @Getter, and @Setter.
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@@ -129,6 +129,9 @@ such as converting the changelog into HTML, and creating javadoc.
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<antcall target="-integrateSnippet">
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<param name="transformationName" value="SneakyThrows" />
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</antcall>
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<antcall target="-integrateSnippet">
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<param name="transformationName" value="Constructor" />
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</antcall>
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</target>
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<target name="-website-dist">
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@@ -283,8 +286,7 @@ such as converting the changelog into HTML, and creating javadoc.
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write your own plugins, the other packages are what you're looking for.</body></html>
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]]></echo>
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<javadoc sourcepath="src/core" defaultexcludes="yes" destdir="build/api" windowtitle="Lombok" Overview="${javadoc.overview.html}">
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<classpath refid="deps.path" />
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<classpath refid="libs.path" />
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<classpath refid="build.path" />
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<link href="http://java.sun.com/javase/6/docs/api/" offline="true" packagelistLoc="./deps/javadoc/java6"/>
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<header><![CDATA[<a href='http://projectlombok.org/'>Lombok</a> - ]]>v${lombok.version}</header>
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<bottom><![CDATA[<i>Copyright © 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href='http://www.opensource.org/licenses/mit-license.php'>MIT licence</a>.]]></bottom>
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@@ -0,0 +1,30 @@
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@RequiredArgsConstructor(staticName = "of")
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@AllArgsConstructor(access = AccessLevel.PROTECTED)
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public class ConstructorExample<T> {
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private int x, y;
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@NonNull private T description;
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private ConstructorExample(T description) {
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if (description == null) throw new NullPointerException("description");
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this.description = description;
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}
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public static <T> ConstructorExample<T> of(T description) {
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return new ConstructorExample<T>(description);
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}
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@java.beans.ConstructorProperties({"x", "y", "description"})
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protected ConstructorExample(int x, int y, T description) {
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if (description == null) throw new NullPointerException("description");
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this.x = x;
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this.y = y;
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this.description = description;
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}
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public static class NoArgsExample {
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@NonNull private String field;
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public NoArgsExample() {
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}
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}
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}
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@@ -0,0 +1,16 @@
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import lombok.AccessLevel;
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import lombok.RequiredArgsConstructor;
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import lombok.AllArgsConstructor;
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import lombok.NonNull;
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@RequiredArgsConstructor(staticName = "of")
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@AllArgsConstructor(access = AccessLevel.PROTECTED)
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public class ConstructorExample<T> {
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private int x, y;
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@NonNull private T description;
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@NoArgsConstructor
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public static class NoArgsExample {
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@NonNull private String field;
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}
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}
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@@ -0,0 +1,90 @@
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<!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>@Data</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>@NoArgsConstructor, @RequiredArgsConstructor, @AllArgsConstructor</h1>
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<div class="byline">Constructors made to order: Generates constructors that take no arguments, one argument per final / non-null field, or one argument for every field.</div>
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<div class="overview">
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<h3>Overview</h3>
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<p>
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This set of 3 annotations generate a constructor that will accept 1 parameter for certain fields, and simply assigns this parameter to the field.
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</p><p>
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<code>@NoArgsConstructor</code> will generate a constructor with no parameters. If this is not possible (because of final fields), a compiler error will result instead.
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For fields with constraints, such as <code>@NonNull</code> fields, <em>no</em> check or assignment is generated, so be aware that these constraints may then not be
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fulfilled until those fields are properly initialized later. Certain java constructs, such as hibernate and the Service Provider Interface require a no-args constructor.
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This annotation is useful primarily in combination with either <code>@Data</code> or one of the other constructor generating annotations.
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</p><p>
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<code>@RequiredArgsConstructor</code> generates a constructor with 1 parameter for each field that requires special handling. All <code>final</code> fields get a parameter,
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as well as any fields that are marked as <code>@NonNull</code> that aren't initialized where they are declared. For those fields marked with <code>@NonNull</code>, an explicit
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null check is also generated. The constructor will throw a <code>NullPointerException</code> if any of the parameters intended for the fields marked with <code>@NonNull</code>
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contain <code>null</code>. The order of the parameters match the order in which the fields appear in your class.
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</p><p>
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<code>@AllArgsConstructor</code> generates a constructor with 1 parameter for each field in your class. Fields marked with <code>@NonNull</code> result in null checks on
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those parameters.
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</p><p>
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Each of these annotations allows an alternate form, where the generated constructor is always private, and an additional static factory method that wraps around the
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private constructor is generated. This mode is enabled by supplying the <code>staticName</code> value for the annotation, like so: <code>@RequiredArgsConstructor(staticName = "of")</code>.
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Such a static factory method will infer generics, unlike a normal constructor. This means your API users get write <code>MapEntry.of("foo", 5)</code> instead of the much longer
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<code>new MapEntry<String, Integer>("foo", 5)</code>.
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</p><p>
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Static fields are skipped by these annotations. Also, a <code>@java.beans.ConstructorProperties</code> annotation is added for all constructors with at least 1 argument,
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which allows bean editor tools to call the generated constructors. <code>@ConstructorProperties</code> is now in Java 1.6, which means that if your code is intended for
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compilation on Java 1.5, a compiler error will occur. <em>Running</em> on a JVM 1.5 should be no problem (the annotation will be ignored). To suppress the generation of
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the <code>@ConstructorProperties</code> annotation, add a parameter to your annotation: <code>@AllArgsConstructor(suppressConstructorProperties=true)</code>. However,
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as java 1.5, which has already been end-of-lifed, fades into obscurity, this parameter will eventually be removed. It has also been marked deprecated for this reason.
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</p><p>
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Unlike most other lombok annotations, the existence of an explicit constructor does not stop these annotations from generating their own constructor. This means you can write
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your own specialized constructor, and let lombok generate the boilerplate ones as well. If a conflict arises (one of your constructors ends up with the same
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signature as one that lombok generates), a compiler error will occur.
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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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Even if a field is explicitly initialized with <code>null</code>, lombok will consider the requirement to avoid null as fulfilled, and will <em>NOT</em> consider
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the field as a 'required' argument. The assumption is that if you explicitly assign <code>null</code> to a field that you've also marked as <code>@NonNull</code>
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signals you must know what you're doing.
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</p><p>
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The <code>@java.beans.ConstructorProperties</code> annotation is never generated for a constructor with no arguments. This also explains why <code>@NoArgsConstructor</code>
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lacks the <code>suppressConstructorProperties</code> annotation method. The <code>@ConstructorProperties</code> annotation is also omitted for private constructors.
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</p>
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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="EqualsAndHashCode.html">Previous feature (@EqualsAndHashCode)</a> | <a href="Data.html">Next feature (@Data)</a><br />
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2010 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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</div>
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<div style="clear: both;"></div>
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</div>
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</div>
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<script type="text/javascript">
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var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
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document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
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</script>
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<script type="text/javascript">
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try {
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var pageTracker = _gat._getTracker("UA-9884254-1");
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pageTracker._trackPageview();
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} catch(err) {}
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</script>
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</body></html>
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+12
-13
@@ -12,25 +12,24 @@
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<div class="header"><a href="../index.html">Project Lombok</a></div>
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<h1>@Data</h1>
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<div class="byline">All together now: A shortcut for <code>@ToString</code>, <code>@EqualsAndHashCode</code>,
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<code>@Getter</code> on all fields, and <code>@Setter</code> on all non-final fields. You even
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get a free constructor to initialize your final fields!</div>
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<code>@Getter</code> on all fields, <code>@Setter</code> on all non-final fields, and <code>@RequiredArgsConstructor</code>!</div>
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<div class="overview">
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<h3>Overview</h3>
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<p>
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<code>@Data</code> is a convenient shortcut annotation that bundles the features of <a href="ToString.html"><code>@ToString</code></a>,
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<a href="EqualsAndHashCode.html"><code>@EqualsAndHashCode</code></a> and <a href="GetterSetter.html"><code>@Getter</code> / <code>@Setter</code></a>
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together: In other words, <code>@Data</code> generates <em>all</em> the boilerplate that is normally associated with simple POJOs
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(Plain Old Java Objects) and beans: getters for all fields, setters for all non-final fields, and appropriate <code>toString</code>, <code>equals</code>
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and <code>hashCode</code> implementations that involve the fields of the class. In addition, <code>@Data</code> generates a constructor that
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<a href="EqualsAndHashCode.html"><code>@EqualsAndHashCode</code></a>, <a href="GetterSetter.html"><code>@Getter</code> / <code>@Setter</code></a>
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and <a href="Constructor.html"><code>@RequiredArgsConstructor</code></a> together: In other words, <code>@Data</code> generates <em>all</em> the
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boilerplate that is normally associated with simple POJOs (Plain Old Java Objects) and beans: getters for all fields, setters for all non-final fields,
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and appropriate <code>toString</code>, <code>equals</code> and <code>hashCode</code> implementations that involve the fields of the class, and a constructor that
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initializes all final fields, as well as all non-final fields with no initializer that have been marked with <code>@NonNull</code> or <code>@NotNull</code>,
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in order to ensure the field is never null.
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</p><p>
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<code>@Data</code> is like having implicit <code>@ToString</code> and <code>@EqualsAndHashCode</code> annotations on the class.
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However, the parameters of <code>@ToString</code> and <code>@EqualsAndHashCode</code> (such as <code>callSuper</code>, <code>includeFieldNames</code> and
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<code>@Data</code> is like having implicit <code>@Getter</code>, <code>@Setter</code>, <code>@ToString</code>, <code>@EqualsAndHashCode</code> and <code>@RequiredArgsConstructor</code>
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annotations on the class. However, the parameters of these annotations (such as <code>callSuper</code>, <code>includeFieldNames</code> and
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<code>exclude</code>) cannot be set with <code>@Data</code>. If you need to set non-default values for any of these parameters, just add those annotations
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explicitly; <code>@Data</code> is smart enough to defer to those annotations.
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</p><p>
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All generated getters and setters will be <code>public</code>. To override the access level, annotate the field with an explicit <code>@Setter</code> and/or
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All generated getters and setters will be <code>public</code>. To override the access level, annotate the field or class with an explicit <code>@Setter</code> and/or
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<code>@Getter</code> annotation. You can also use this annotation (by combining it with <code>AccessLevel.NONE</code>) to suppress generating a getter and/or setter
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altogether.
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</p><p>
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@@ -62,8 +61,8 @@
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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>See the small print of <a href="ToString.html"><code>@ToString</code></a>, <a href="EqualsAndHashCode.html"><code>@EqualsAndHashCode</code></a> and
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<a href="GetterSetter.html"><code>@Getter / @Setter</code></a>.
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<p>See the small print of <a href="ToString.html"><code>@ToString</code></a>, <a href="EqualsAndHashCode.html"><code>@EqualsAndHashCode</code></a>,
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<a href="GetterSetter.html"><code>@Getter / @Setter</code></a> and <a href="Constructor.html">@RequiredArgsConstructor</a>.
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</p><p>
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Any annotations named <code>@NonNull</code> (case insensitive) on a field are interpreted as: This field must not ever hold
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<em>null</em>. Therefore, these annotations result in an explicit null check in the generated constructor for the provided field. Also, these
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@@ -76,8 +75,8 @@
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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="EqualsAndHashCode.html">Previous feature (@EqualsAndHashCode)</a> | <a href="Cleanup.html">Next feature (@Cleanup)</a><br />
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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<a href="index.html">Back to features</a> | <a href="Constructor.html">Previous feature (@<em>X</em>Constructor)</a> | <a href="Cleanup.html">Next feature (@Cleanup)</a><br />
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009-2010 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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</div>
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<div style="clear: both;"></div>
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</div>
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@@ -74,7 +74,7 @@
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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="ToString.html">Previous feature (@ToString)</a> | <a href="Data.html">Next feature (@Data)</a><br />
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<a href="index.html">Back to features</a> | <a href="ToString.html">Previous feature (@ToString)</a> | <a href="Constructor.html">Next feature (@<em>X</em>Constructor)</a><br />
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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</div>
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<div style="clear: both;"></div>
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@@ -22,6 +22,12 @@
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</p><p>
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The generated getter/setter method will be <code>public</code> unless you explicitly specify an <code>AccessLevel</code>, as shown in the example above.
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Legal access levels are <code>PUBLIC</code>, <code>PROTECTED</code>, <code>PACKAGE</code>, and <code>PRIVATE</code>.
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</p><p>
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You can also put a <code>@Getter</code> and/or <code>@Setter</code> annotation on a class. In that case, it's as if you annotate all the non-static fields in that
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class with the annotation.
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</p><p>
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You can always manually disable getter/setter generation for any field by using the special <code>AccessLevel.NONE</code> access level. This lets you override the
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behaviour of a <code>@Getter</code>, <code>@Setter</code> or <code>@Data</code> annotation on a class.
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</p>
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</div>
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<div class="snippets">
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@@ -63,7 +69,7 @@
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</div>
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<div class="footer">
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<a href="index.html">Back to features</a> | <span class="disabled">Previous feature</span> | <a href="ToString.html">Next feature (@ToString)</a><br />
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009-2010 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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</div>
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<div style="clear: both;"></div>
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</div>
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@@ -19,10 +19,11 @@
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<dd>No need to start a debugger to see your fields: Just let lombok generate a <code>toString</code> for you!</dd>
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<dt><a href="EqualsAndHashCode.html"><code>@EqualsAndHashCode</code></a></dt>
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<dd>Equality made easy: Generates <code>hashCode</code> and <code>equals</code> implementations from the fields of your object.</dd>
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<dt><a href="Constructor.html"><code>@NoArgsConstructor</code>, <code>@RequiredArgsConstructor</code> and <code>@AllArgsConstructor</code></a></dt>
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<dd>Constructors made to order: Generates constructors that take no arguments, one argument per final / non-null field, or one argument for every field.</dd>
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<dt><a href="Data.html"><code>@Data</code></a></dt>
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<dd>All together now: A shortcut for <code>@ToString</code>, <code>@EqualsAndHashCode</code>,
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<code>@Getter</code> on all fields, and <code>@Setter</code> on all non-final fields. You even
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get a free constructor to initialize your final fields!</dd>
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<code>@Getter</code> on all fields, and <code>@Setter</code> on all non-final fields, and <code>@RequiredArgsConstructor</code>!</dd>
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<dt><a href="Cleanup.html"><code>@Cleanup</code></a></dt>
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<dd>Automatic resource management: Call your <code>close()</code> methods safely with no hassle.</dd>
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<dt><a href="Synchronized.html"><code>@Synchronized</code></a></dt>
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@@ -50,7 +51,7 @@
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your source files for source-level tools such as javadoc and GWT. More information about how to run delombok, including instructions for build tools
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can be found at the <a href="delombok.html">delombok page</a>.</div>
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||||
<div class="footer">
|
||||
<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009-2010 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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</div>
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<div style="clear: both;"></div>
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</div>
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Reference in new issue
Block a user