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<#import "../_features.html" as f>
<@f.scaffold title="@FieldNameConstants" logline="Name... that... field! String constants for your field's names.">
<@f.history>
<p>
@FieldNameConstants was introduced as experimental feature in lombok v1.16.22.
</p><p>
@FieldNameConstants was redesigned in lombok v1.18.4.
</p>
</@f.history>
<@f.experimental>
<ul>
<li>
New feature; unsure if this busts enough boilerplate.
</li>
</ul>
Current status: <em>neutral</em> - As a just-introduced feature we're still gathering feedback.
</@f.experimental>
<@f.overview>
<p>
The <code>@FieldNameConstants</code> annotation generates an inner type which contains 1 constant for each field in your class; either string constants (fields marked <code>public static final</code>, of type <code>java.lang.String</code>) or if you prefer, an enum type with 1 value for each field. <code>@FieldNameConstants</code> is useful for various marshalling and serialization frameworks. The constant field (whether enum value or string constant) always has the exact same name as the field, capitalization and all.
</p><p>
The generated inner type is by default called <code>Fields</code> and is <code>public</code>. You can modify this via <code>@FieldNameConstants(innerTypeName = "FieldNames", access = AccessLevel.PACKAGE)</code> for example. The default inner type name can also be modified via configuration key <code>lombok.fieldNameConstants.innerTypeName</code>. The generated fields are always <code>public</code>.
</p><p>
Must be applied to classes (or enums, though you'd rarely want to do that). By default includes all non-transient, non-static fields. You can use <code>@FieldNameConstants.Include</code> in fields + <code>@FieldNameConstants(onlyExplicitlyIncluded = true)</code>, or <code>@FieldNameConstants.Exclude</code> for more fine-grained control.
</p>
</@f.overview>
<@f.snippets name="experimental/FieldNameConstants" />
<@f.confKeys>
<dt>
<code>lombok.fieldNameConstants.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of <code>@FieldDefaults</code> as a warning or error if configured.
</dd><dt>
<code>lombok.fieldNameConstants.innerTypeName</code> = <em>a string</em> (default: 'Fields')
</dt><dd>
The name of the inner type generated by lombok can be controlled with this configuration key.
</dd>
</@f.confKeys>
<@f.smallPrint>
<p>
Starting with lombok v1.18.6, lombok will silently skip generating anything that already exists. You can define the inner <code>Fields</code> enum/class yourself,
in which case lombok will add all the enum constants / public static final fields you haven't written yourself.
</p><p>
From lombok v1.16.22 to lombok v1.18.2, this feature generated constants inside the type directly; the name of these fields would for example turn field <code>exampleFieldName</code> into <code>public static final String FIELD_EXAMPLE_FIELD_NAME = "exampleFieldName";</code>. The prefix and suffix (here, <code>FIELD_</code>, and the empty string) were configurable. Starting with lombok v1.18.4 this feature has been redesigned into generating an inner type as described above.
</p><p>
Any parameters of lombok annotations that take strings need to be supplied actual string literals; you cannot have references to constants like those generated by <code>@FieldNameConstants</code>. If you'd like to use <code>@FieldNameConstants</code> to for example fill in the <code>of</code> and/or <code>exclude</code> parameters of <code>@ToString</code> and similar lombok annotations, use the <code>@ToString.Include</code> / <code>@ToString.Exclude</code> etc system instead; these are described at the feature pages for those features.
</p><p>
Like other lombok handlers that touch fields, any field whose name starts with a dollar (<code>$</code>) symbol is skipped entirely. Such a field will not be modified at all. Static fields are also skipped.
</p>
</@f.smallPrint>
</@f.scaffold>
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