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ElasticsearchGeoPointSpatialWithinCirclePredicate.java
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ElasticsearchGeoPointSpatialWithinCirclePredicate.java
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/*
* Hibernate Search, full-text search for your domain model
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.search.backend.elasticsearch.types.predicate.impl;
import org.hibernate.search.backend.elasticsearch.gson.impl.JsonAccessor;
import org.hibernate.search.backend.elasticsearch.gson.impl.JsonObjectAccessor;
import org.hibernate.search.backend.elasticsearch.search.impl.AbstractElasticsearchCodecAwareSearchValueFieldQueryElementFactory;
import org.hibernate.search.backend.elasticsearch.search.impl.ElasticsearchSearchContext;
import org.hibernate.search.backend.elasticsearch.search.impl.ElasticsearchSearchValueFieldContext;
import org.hibernate.search.backend.elasticsearch.search.predicate.impl.AbstractElasticsearchSingleFieldPredicate;
import org.hibernate.search.backend.elasticsearch.search.predicate.impl.PredicateRequestContext;
import org.hibernate.search.backend.elasticsearch.types.codec.impl.ElasticsearchFieldCodec;
import org.hibernate.search.engine.search.predicate.SearchPredicate;
import org.hibernate.search.engine.search.predicate.spi.SpatialWithinCirclePredicateBuilder;
import org.hibernate.search.engine.spatial.DistanceUnit;
import org.hibernate.search.engine.spatial.GeoPoint;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
public class ElasticsearchGeoPointSpatialWithinCirclePredicate extends AbstractElasticsearchSingleFieldPredicate {
private static final JsonObjectAccessor GEO_DISTANCE_ACCESSOR =
JsonAccessor.root().property( "geo_distance" ).asObject();
private static final JsonAccessor<Double> DISTANCE_ACCESSOR =
JsonAccessor.root().property( "distance" ).asDouble();
private static final JsonAccessor<Boolean> IGNORE_UNMAPPED_ACCESSOR =
JsonAccessor.root().property( "ignore_unmapped" ).asBoolean();
private final double distanceInMeters;
private final JsonElement center;
private ElasticsearchGeoPointSpatialWithinCirclePredicate(Builder builder) {
super( builder );
distanceInMeters = builder.distanceInMeters;
center = builder.center;
}
@Override
protected JsonObject doToJsonQuery(PredicateRequestContext context, JsonObject outerObject,
JsonObject innerObject) {
DISTANCE_ACCESSOR.set( innerObject, distanceInMeters );
innerObject.add( absoluteFieldPath, center );
if ( indexNames().size() > 1 ) {
// There are multiple target indexes; some of them may not declare the field.
// Instruct ES to behave as if the field had no value in that case.
IGNORE_UNMAPPED_ACCESSOR.set( innerObject, true );
}
GEO_DISTANCE_ACCESSOR.set( outerObject, innerObject );
return outerObject;
}
public static class Factory
extends
AbstractElasticsearchCodecAwareSearchValueFieldQueryElementFactory<SpatialWithinCirclePredicateBuilder, GeoPoint> {
public Factory(ElasticsearchFieldCodec<GeoPoint> codec) {
super( codec );
}
@Override
public Builder create(ElasticsearchSearchContext searchContext, ElasticsearchSearchValueFieldContext<GeoPoint> field) {
return new Builder( codec, searchContext, field );
}
}
private static class Builder extends AbstractBuilder implements SpatialWithinCirclePredicateBuilder {
private final ElasticsearchFieldCodec<GeoPoint> codec;
private double distanceInMeters;
private JsonElement center;
private Builder(ElasticsearchFieldCodec<GeoPoint> codec, ElasticsearchSearchContext searchContext,
ElasticsearchSearchValueFieldContext<GeoPoint> field) {
super( searchContext, field );
this.codec = codec;
}
@Override
public void circle(GeoPoint center, double radius, DistanceUnit unit) {
this.distanceInMeters = unit.toMeters( radius );
this.center = codec.encode( center );
}
@Override
public SearchPredicate build() {
return new ElasticsearchGeoPointSpatialWithinCirclePredicate( this );
}
}
}