org.hibernate.envers.internal.entities.mapper.relation.component.MiddleMapElementNotKeyComponentMapper Maven / Gradle / Ivy
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Hibernate's entity version (audit/history) support
/*
* 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.envers.internal.entities.mapper.relation.component;
import java.util.Map;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.envers.configuration.internal.AuditEntitiesConfiguration;
import org.hibernate.envers.internal.entities.EntityInstantiator;
import org.hibernate.envers.internal.tools.query.Parameters;
/**
* A middle table component mapper which assigns a Map-type's element as part
* of the data-portion of the mapping rather than the identifier.
*
* This is useful for mappings where the database does not support CLOB or NCLOB
* data types as part of the primary key for the table.
*
* An example:
*
* @ElementCollection
* @Lob
* private Map<String, String> values;
*
*
* @author Chris Cranford
*/
public class MiddleMapElementNotKeyComponentMapper implements MiddleComponentMapper {
private final String propertyName;
private final AuditEntitiesConfiguration verEntCfg;
public MiddleMapElementNotKeyComponentMapper(AuditEntitiesConfiguration verEntCfg, String propertyName) {
this.propertyName = propertyName;
this.verEntCfg = verEntCfg;
}
@Override
@SuppressWarnings({"unchecked"})
public Object mapToObjectFromFullMap(
EntityInstantiator entityInstantiator,
Map data,
Object dataObject,
Number revision) {
return data.get( propertyName );
}
@Override
public void mapToMapFromObject(
SessionImplementor session,
Map idData,
Map data,
Object obj) {
data.put( propertyName, obj );
}
@Override
public void addMiddleEqualToQuery(
Parameters parameters,
String idPrefix1,
String prefix1,
String idPrefix2,
String prefix2) {
parameters.addWhere( prefix1 + "." + propertyName, false, "=", prefix2 + "." + propertyName, false );
}
}