public EntityConfiguration(String versionsEntityName,
    IdMappingData idMappingData,
    ExtendedPropertyMapper propertyMapper,
    String parentEntityName) 
{
        this.versionsEntityName = versionsEntityName;
        this.idMappingData = idMappingData;
        this.propertyMapper = propertyMapper;
        this.parentEntityName = parentEntityName;
        this.relations = new HashMap< String, RelationDescription >();
}

 public  void addToManyMiddleNotOwningRelation(String fromPropertyName,
    String mappedByPropertyName,
    String toEntityName) 
{
        relations.put(fromPropertyName, new RelationDescription(fromPropertyName, RelationType.TO_MANY_MIDDLE_NOT_OWNING,
                toEntityName, mappedByPropertyName, null));
}

 public  void addToManyMiddleRelation(String fromPropertyName,
    String toEntityName) 
{
        relations.put(fromPropertyName, new RelationDescription(fromPropertyName, RelationType.TO_MANY_MIDDLE,
                toEntityName, null, null));
}

 public  void addToManyNotOwningRelation(String fromPropertyName,
    String mappedByPropertyName,
    String toEntityName,
    IdMapper idMapper) 
{
        relations.put(fromPropertyName, new RelationDescription(fromPropertyName, RelationType.TO_MANY_NOT_OWNING,
                toEntityName, mappedByPropertyName, idMapper));
}

 public  void addToOneNotOwningRelation(String fromPropertyName,
    String mappedByPropertyName,
    String toEntityName,
    IdMapper idMapper) 
{
        relations.put(fromPropertyName, new RelationDescription(fromPropertyName, RelationType.TO_ONE_NOT_OWNING,
                toEntityName, mappedByPropertyName, idMapper));
}

 public  void addToOneRelation(String fromPropertyName,
    String toEntityName,
    IdMapper idMapper) 
{
        relations.put(fromPropertyName, new RelationDescription(fromPropertyName, RelationType.TO_ONE,
                toEntityName, null, idMapper));
}

 public IdMapper getIdMapper() 
{
        return idMappingData.getIdMapper();
}

 public IdMappingData getIdMappingData() 
{
        return idMappingData;
}

 String getParentEntityName() 
{
        return parentEntityName;
}

 public ExtendedPropertyMapper getPropertyMapper() 
{
        return propertyMapper;
}

 public RelationDescription getRelationDescription(String propertyName) 
{
        return relations.get(propertyName);
}

 Iterable getRelationsIterator() 
{
        return relations.values();
}

 String getVersionsEntityName() 
{
        return versionsEntityName;
}

 public boolean isRelation(String propertyName) 
{
        return relations.get(propertyName) != null;
}