IdMapper.java

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.envers.entities.mapper.id;
import java.util.List;
import java.util.Map;
import org.hibernate.envers.tools.query.Parameters;

/**
 * @author Adam Warski (adam at warski dot org)
 */
public interface IdMapper {
    void mapToMapFromId(Map<String, Object> data, Object obj);

    void mapToMapFromEntity(Map<String, Object> data, Object obj);

    /**
     * @param obj Object to map to.
     * @param data Data to map.
     * @return True if data was mapped; false otherwise (when the id is {@code null}).
     */
    boolean mapToEntityFromMap(Object obj, Map data);

    Object mapToIdFromEntity(Object data);

    Object mapToIdFromMap(Map data);

    /**
     * Creates a mapper with all mapped properties prefixed. A mapped property is a property which
     * is directly mapped to values (not composite).
     * @param prefix Prefix to add to mapped properties
     * @return A copy of the current property mapper, with mapped properties prefixed.
     */
    IdMapper prefixMappedProperties(String prefix);

    /**
     * @param obj Id from which to map.
     * @return A set parameter data, needed to build a query basing on the given id.
     */
    List<QueryParameterData> mapToQueryParametersFromId(Object obj);

    /**
     * Adds query statements, which contains restrictions, which express the property that the id of the entity
     * with alias prefix1, is equal to the id of the entity with alias prefix2 (the entity is the same).
     * @param parameters Parameters, to which to add the statements.
     * @param prefix1 First alias of the entity + prefix to add to the properties.
     * @param prefix2 Second alias of the entity + prefix to add to the properties.
     */
    void addIdsEqualToQuery(Parameters parameters, String prefix1, String prefix2);

    /**
     * Adds query statements, which contains restrictions, which express the property that the id of the entity
     * with alias prefix1, is equal to the id of the entity with alias prefix2 mapped by the second mapper
     * (the second mapper must be for the same entity, but it can have, for example, prefixed properties).
     * @param parameters Parameters, to which to add the statements.
     * @param prefix1 First alias of the entity + prefix to add to the properties.
     * @param mapper2 Second mapper for the same entity, which will be used to get properties for the right side
     * of the equation.
     * @param prefix2 Second alias of the entity + prefix to add to the properties.
     */
    void addIdsEqualToQuery(Parameters parameters, String prefix1, IdMapper mapper2, String prefix2);

    /**
     * Adds query statements, which contains restrictions, which express the property that the id of the entity
     * with alias prefix, is equal to the given object.
     * @param parameters Parameters, to which to add the statements.
     * @param id Value of id.
     * @param prefix Prefix to add to the properties (may be null).
     * @param equals Should this query express the "=" relation or the "<>" relation.
     */
    void addIdEqualsToQuery(Parameters parameters, Object id, String prefix, boolean equals);

    /**
     * Adds query statements, which contains named parameters, which express the property that the id of the entity
     * with alias prefix, is equal to the given object. It is the responsibility of the using method to read
     * parameter values from the id and specify them on the final query object.
     * @param parameters Parameters, to which to add the statements.
     * @param prefix Prefix to add to the properties (may be null).
     * @param equals Should this query express the "=" relation or the "<>" relation.
     */
    void addNamedIdEqualsToQuery(Parameters parameters, String prefix, boolean equals);
}