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authorReinier Zwitserloot <reinier@tipit.to>2009-07-28 17:38:26 +0200
committerReinier Zwitserloot <reinier@tipit.to>2009-07-28 17:41:56 +0200
commitfb6be45d2bcb97e0e0288ba81a602679c7bedc46 (patch)
treea5495fdf2769d06714b5eb96e203b33430513450 /website/features/Data.html
parente744f1829adf95f3b54fa54d813eb26c4c8e8c76 (diff)
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Added website feature documentation for @ToString and @EqualsAndHashCode, and modified the docs for @Data to refer to the docs of these new annotations.
The build script for the website has been updated to clean out the website build dir first, so files that used to exist but have now been tossed are no longer there. There's also a special website-no-videos target which builds a website deployable without the videos. This makes the upload a lot faster if the videos haven't changed.
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1 files changed, 22 insertions, 22 deletions
diff --git a/website/features/Data.html b/website/features/Data.html
index b6f0cc85..ee81405a 100644
--- a/website/features/Data.html
+++ b/website/features/Data.html
@@ -11,31 +11,34 @@
<div class="meat">
<div class="header"><a href="../index.html">Project Lombok</a></div>
<h1>@Data</h1>
- <div class="byline">'struct' for java: Automatically generate <code>toString</code>, <code>hashCode</code>, <code>equals</code>, a constructor, and getters and setters
- from just the fields in your class.</div>
+ <div class="byline">All together now: A shortcut for <code>@ToString</code>, <code>@EqualsAndHashCode</code>,
+ <code>@Getter</code> on all fields, and <code>@Setter</code> on all non-final fields. You even
+ get a free constructor to initialize your final fields!</div>
<div class="overview">
<h3>Overview</h3>
<p>
- Any class definition may be annotated with <code>@Data</code> to let lombok generate all the boilerplate that is associated with simple POJOs
- (Plain Old Java Objects) and beans: getters for all fields, setters for all non-final fields, a useful <code>toString</code>, and implementations
- of <code>hashCode</code> and <code>equals</code> which consider any two objects of this type with the same values for each field as equal. A
- constructor is also generated containing 1 parameter for each final field, in the order the fields are defined. This constructor simply assigns
- each parameter to the appropriate field.
- </p>
- <p>
- To override the access level of any getter/setter for any field, annotate the field with a <code>@Setter</code> or <code>@Getter</code> annotation
- with the appropriate <code>AccessLevel</code> value. See the example below. For more information on how the getters/setters are generated,
- see the documentation for <a href="GetterSetter.html"><code>@Getter</code> and <code>@Setter</code></a>.
+ <code>@Data</code> is a convenient shortcut annotation that bundles the features of <a href="ToString.html"><code>@ToString</code></a>,
+ <a href="EqualsAndHashCode.html">@EqualsAndHashCode</code></a> and <a href="GetterSetter.html"><code>@Getter</code> / <code>@Setter</code></a>
+ together: In other words, <code>@Data</code> generates <em>all</em> the boilerplate that is normally associated with simple POJOs
+ (Plain Old Java Objects) and beans: getters for all fields, setters for all non-final fields, and appropriate <code>toString</code>, <code>equals</code>
+ and <code>hashCode</code> implementations that involve the fields of the class. In addition, <code>@Data</code> generates a constructor that
+ initialized all final fields.
+ </p><p>
+ <code>@Data</code> is like having implicit <code>@ToString</code> and <code>@EqualsAndHashCode</code> annotations on the class.
+ However, the parameters of <code>@ToString</code> and <code>@EqualsAndHashCode</code> (such as <code>callSuper</code>, <code>includeFieldNames</code> and
+ <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
+ explicitly; <code>@Data</code> is smart enough to defer to those annotations.
+ </p><p>
+ 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
+ <code>@Getter</code> annotation.
</p><p>
All fields marked as <code>transient</code> will not be considered for <code>hashCode</code> and <code>equals</code>. All static fields will be
skipped entirely (not considered for any of the generated methods, and no setter/getter will be made for them).
- The generated getter/setter method will be <code>public</code> unless you explicitly specify an <code>AccessLevel</code>, as shown in the example below.
- Legal access levels are <code>PUBLIC</code>, <code>PROTECTED</code>, <code>PACKAGE</code>, and <code>PRIVATE</code>.
</p><p>
- If any method that would normally be generated exists <em>in name</em> that method will not be generated, and no warning or error is emitted. For example,
- if you already have a method with signature <code>void hashCode(int a, int b, int c)</code>, no <code>int hashCode()</code> method will be generated,
- even though technically <code>int hashCode()</code> is an entirely different method. The same rule applies to the constructor, <code>toString</code>,
- <code>hashCode</code>, and all getters and setters.
+ If the class already contains a method with the same name as any method that would normally be generated, that method is not generated, and no warning or
+ error is emitted. For example, if you already have a method with signature <code>void hashCode(int a, int b, int c)</code>, no <code>int hashCode()</code>
+ method will be generated, even though technically <code>int hashCode()</code> is an entirely different method. The same rule applies to the constructor,
+ <code>toString</code>, <code>equals</code>, and all getters and setters.
</p><p>
<code>@Data</code> can handle generics parameters for fields just fine. In order to reduce the boilerplate when constructing objects for classes with
generics, you can use the <code>staticConstructor</code> parameter to generate a private constructor, as well as a static method that returns a new
@@ -61,9 +64,6 @@
Arrays are 'deep' compared/printed/hashCoded, which means that arrays that contain themselves will result in <code>StackOverflowError</code>s. However,
this behaviour is no different from e.g. <code>ArrayList</code>.
</p><p>
- You may safely presume that the hashCode implementation used will not change between versions of lombok, however this guarantee is not set in stone;
- if there's a significant performance improvement to be gained from using an alternate hash algorithm, that will be substituted in a future version.
- </p><p>
For a general idea of how lombok generated the <code>equals</code>, <code>hashCode</code>, and <code>toString</code> methods, check the example after.
</p><p>
For the purposes of equality, 2 <code>NaN</code> (not a number) values for floats and doubles are considered equal, eventhough 'NaN == NaN' would
@@ -73,7 +73,7 @@
</div>
</div>
<div class="footer">
- <a href="index.html">Back to features</a> | <a href="GetterSetter.html">Previous feature (@Getter / @Setter)</a> | <a href="Cleanup.html">Next feature (@Cleanup)</a><br />
+ <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 />
<a href="../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright &copy; 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT licence</a>.</span>
</div>
<div style="clear: both;"></div>