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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-10198" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-88d02896-2408-4338-924c-28ffb8068b2a" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-10198" style="color: #3b73af; text-decoration: none">HHH-10198</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-10198" style="color: #3b73af; text-decoration: none">Consider design for annotation for custom IdentifierGenerator declarations</a> </span>
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Issue Type:
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Unassigned
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16/Oct/2015 00:34 AM
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jandex-binding
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="steve" id="email_steve" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=steve" style="color:#6c797f;; color: #3b73af; text-decoration: none">Steve Ebersole</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Consider the pattern used for <tt>org.hibernate.annotations.ValueGenerationType</tt>.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">In some ways this is an extension to <tt>GenericGenerator</tt>. One option is to define this annotation with the intention that it be attached to the custom <tt>org.hibernate.id.IdentifierGenerator</tt> implementation class for discovery and some basic configuration. E.g.</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@ThisNewAnnotation
<span class="code-keyword" style="color: #000091">public</span> class MyCustomGenerator <span class="code-keyword" style="color: #000091">implements</span> IdentifierGenerator {
...
}
</pre>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Like we did with <tt>ValueGenerationType</tt>, I would love for this to express how the implementation should be configured from annotation values. Not sure exactly how this would look, but something like:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
/**
* Annotation to identify IdentifierGenerator implementations
*/
<span class="code-keyword" style="color: #000091">public</span> @<span class="code-keyword" style="color: #000091">interface</span> GeneratorImplementation {
<span class="code-comment" style="color: #808080">// <span class="code-keyword" style="color: #000091; color: #808080">this</span> allows non-indexed (Jandex) resolutions. Do we want/need it?
</span> <span class="code-comment" style="color: #808080">// The Jndex-y option is to simply find instances of <span class="code-keyword" style="color: #000091; color: #808080">this</span> annotation
</span> <span class="code-comment" style="color: #808080">// and look it their targets
</span> <span class="code-object" style="color: #910091">Class</span>[] generatorImpls();
}
/**
* Extended IdentifierGenerator contract to account <span class="code-keyword" style="color: #000091">for</span> annotation consumption
*/
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> AnnotationBasedIdentifierGenerator<A <span class="code-keyword" style="color: #000091">extends</span> Annotation,T <span class="code-keyword" style="color: #000091">extends</span> Serializable>
<span class="code-keyword" style="color: #000091">extends</span> IdentifierGenerator {
/**
* Consume the annotation (configuration)
*/
void initialize(A ann);
@Override
T generate(SessionImplementor session, <span class="code-object" style="color: #910091">Object</span> object);
}
<span class="code-comment" style="color: #808080">// Sample usage ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
</span>
/**
* My custom generator annotation
*/
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> @UuidGenerator {
<span class="code-keyword" style="color: #000091">enum</span> Strategy( RANDOM, RFC_4122 )
<span class="code-object" style="color: #910091">String</span> name();
Strategy strategy() <span class="code-keyword" style="color: #000091">default</span> RFC_4122;
}
@GeneratorImplementation
<span class="code-keyword" style="color: #000091">public</span> class UuidIdentifierGenerator
<span class="code-keyword" style="color: #000091">implements</span> AnnotationBasedIdentifierGenerator<UuidGenerator,UUID> {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> generatorName;
<span class="code-keyword" style="color: #000091">private</span> UUIDGenerationStrategy uuidGenStrategy;
@Override
<span class="code-keyword" style="color: #000091">public</span> void initialize(UuidGenerator ann) {
<span class="code-keyword" style="color: #000091">this</span>.generatorName = ann.name();
<span class="code-keyword" style="color: #000091">this</span>.uuidGenStrategy = decodeStrategy( ann.strategy() );
}
<span class="code-keyword" style="color: #000091">private</span> UUIDGenerationStrategy decodeStrategy(Strategy strategy) {
<span class="code-keyword" style="color: #000091">switch</span>( strategy ) {
...
}
}
@Override
UUID generate(SessionImplementor session, <span class="code-object" style="color: #910091">Object</span> object) {
<span class="code-keyword" style="color: #000091">return</span> uuidGenStrategy.generateUUID( session );
}
}
<span class="code-keyword" style="color: #000091">public</span> class MyEntity {
@GeneratedValue
@UuidGenerator(strategy=RANDOM)
<span class="code-keyword" style="color: #000091">private</span> UUID id;
...
}
</pre>
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