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Integrate support for Spatial/GIS data into Hibernate O/RM
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.spatial.dialect.mysql;
import java.util.Map;
import org.hibernate.HibernateException;
import org.hibernate.boot.model.TypeContributions;
import org.hibernate.dialect.MySQL8Dialect;
import org.hibernate.dialect.function.SQLFunction;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.spatial.GeolatteGeometryJavaTypeDescriptor;
import org.hibernate.spatial.GeolatteGeometryType;
import org.hibernate.spatial.JTSGeometryJavaTypeDescriptor;
import org.hibernate.spatial.JTSGeometryType;
import org.hibernate.spatial.SpatialDialect;
import org.hibernate.spatial.SpatialFunction;
import org.hibernate.spatial.SpatialRelation;
import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
/**
* Created by Karel Maesen, Geovise BVBA on 2019-03-07.
*/
public class MySQL8SpatialDialect extends MySQL8Dialect implements SpatialDialect {
private MySQLSpatialDialect dialectDelegate = new MySQLSpatialDialect();
private MySQL8SpatialFunctions spatialFunctions = new MySQL8SpatialFunctions();
/**
* Constructs an instance
*/
public MySQL8SpatialDialect() {
super();
registerColumnType(
MySQLGeometryTypeDescriptor.INSTANCE.getSqlType(),
"GEOMETRY"
);
for ( Map.Entry entry : spatialFunctions ) {
registerFunction( entry.getKey(), entry.getValue() );
}
}
@Override
public void contributeTypes(TypeContributions typeContributions, ServiceRegistry serviceRegistry) {
dialectDelegate.contributeTypes( typeContributions, serviceRegistry );
}
@Override
public String getSpatialRelateSQL(String columnName, int spatialRelation) {
switch ( spatialRelation ) {
case SpatialRelation.WITHIN:
return " ST_within(" + columnName + ",?)";
case SpatialRelation.CONTAINS:
return " ST_contains(" + columnName + ", ?)";
case SpatialRelation.CROSSES:
return " ST_crosses(" + columnName + ", ?)";
case SpatialRelation.OVERLAPS:
return " ST_overlaps(" + columnName + ", ?)";
case SpatialRelation.DISJOINT:
return " ST_disjoint(" + columnName + ", ?)";
case SpatialRelation.INTERSECTS:
return " ST_intersects(" + columnName
+ ", ?)";
case SpatialRelation.TOUCHES:
return " ST_touches(" + columnName + ", ?)";
case SpatialRelation.EQUALS:
return " ST_equals(" + columnName + ", ?)";
default:
throw new IllegalArgumentException(
"Spatial relation is not known by this dialect"
);
}
}
@Override
public String getTypeName(int code, long length, int precision, int scale) throws HibernateException {
return dialectDelegate.getTypeName( code, length, precision, scale );
}
@Override
public SqlTypeDescriptor remapSqlTypeDescriptor(SqlTypeDescriptor sqlTypeDescriptor) {
return dialectDelegate.remapSqlTypeDescriptor( sqlTypeDescriptor );
}
@Override
public String getSpatialFilterExpression(String columnName) {
return dialectDelegate.getSpatialFilterExpression( columnName );
}
@Override
public String getSpatialAggregateSQL(String columnName, int aggregation) {
return dialectDelegate.getSpatialAggregateSQL( columnName, aggregation );
}
@Override
public String getDWithinSQL(String columnName) {
return dialectDelegate.getDWithinSQL( columnName );
}
@Override
public String getHavingSridSQL(String columnName) {
return " (ST_SRID(" + columnName + ") = ?) ";
}
@Override
public String getIsEmptySQL(String columnName, boolean isEmpty) {
final String emptyExpr = " ST_IsEmpty(" + columnName + ") ";
return isEmpty ? emptyExpr : "( NOT " + emptyExpr + ")";
}
@Override
public boolean supportsFiltering() {
return true;
}
@Override
public boolean supports(SpatialFunction function) {
return spatialFunctions.get( function.toString() ) != null;
}
}