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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Following our discussion in <a href="https://github.com/hibernate/hibernate-search/pull/1101" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/hibernate/hibernate-search/pull/1101</a> , the idea would be to introduce something along the lines of:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">enum</span> ElasticsearchProjection <span class="code-keyword" style="color: #000091">implements</span> Projection {
THIS(<span class="code-quote" style="color: #009100">"__Elasticsearch_This"</span>),
ID(<span class="code-quote" style="color: #009100">"__Elasticsearch_Id"</span>),
SCORE(<span class="code-quote" style="color: #009100">"__Elasticsearch_Score"</span>),
OBJECT_CLASS(<span class="code-quote" style="color: #009100">"__Elasticsearch_HibernateClass"</span>),
SPATIAL_DISTANCE(<span class="code-quote" style="color: #009100">"__Elasticsearch_SpatialDistance"</span>),
SOURCE(<span class="code-quote" style="color: #009100">"__Elasticsearch_Source"</span>);
<span class="code-keyword" style="color: #000091">static</span> {
<span class="code-keyword" style="color: #000091">for</span> ( Projection projection : values() ) {
ProjectionCompatibilityLayer.register( projection );
}
}
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> key;
<span class="code-keyword" style="color: #000091">private</span> ElasticsearchProjection(<span class="code-object" style="color: #910091">String</span> key) {
<span class="code-keyword" style="color: #000091">this</span>.key = key;
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> key() {
<span class="code-keyword" style="color: #000091">return</span> key;
}
}
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/**
* We would deprecate setProjection(<span class="code-object" style="color: #910091">String</span>) <span class="code-keyword" style="color: #000091">for</span> setProjection(Projection) and use <span class="code-keyword" style="color: #000091">this</span> class to provide a compatibility layer.
*/
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">final</span> class ProjectionCompatibilityLayer {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">static</span> <span class="code-keyword" style="color: #000091">final</span> ConcurrentMap<<span class="code-object" style="color: #910091">String</span>, Projection> MAPPING = <span class="code-keyword" style="color: #000091">new</span> ConcurrentHashMap<>();
<span class="code-keyword" style="color: #000091">private</span> ProjectionCompatibilityLayer() {
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> void register(Projection projection) {
<span class="code-keyword" style="color: #000091">if</span> ( MAPPING.containsKey( projection.key() ) ) {
<span class="code-keyword" style="color: #000091">throw</span> duplicate...;
}
MAPPING.put( projection.key(), projection );
}
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> Projection getProjection(<span class="code-object" style="color: #910091">String</span> key) {
<span class="code-keyword" style="color: #000091">if</span> ( !MAPPING.containsKey( key ) ) {
<span class="code-keyword" style="color: #000091">throw</span> no projection matching <span class="code-keyword" style="color: #000091">this</span> key;
}
<span class="code-keyword" style="color: #000091">return</span> MAPPING.get( key );
}
}
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