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## org.hibernate.envers.entities.mapper.relation
Class AbstractToOneMapper

    java.lang.Object
      org.hibernate.envers.entities.mapper.relation.AbstractToOneMapper

All Implemented Interfaces:
  PropertyMapper

Direct Known Subclasses:
  AbstractOneToOneMapper, ToOneIdMapper

    public abstract class AbstractToOneMapper

extends Object
implements PropertyMapper

Base class for property mappers that manage to-one relation.

Nested Class Summary
`protected class` | `AbstractToOneMapper.EntityInfo` Simple descriptor of an entity.

Constructor Summary
`protected` | `AbstractToOneMapper(PropertyData propertyData)`

Method Summary
`protected AbstractToOneMapper.EntityInfo` | `getEntityInfo(AuditConfiguration verCfg, String entityName)`
`protected PropertyData` | `getPropertyData()`
`List<PersistentCollectionChangeData>` | `mapCollectionChanges(String referencingPropertyName, PersistentCollection newColl, Serializable oldColl, Serializable id)` Maps collection changes
`void` | `mapToEntityFromMap(AuditConfiguration verCfg, Object obj, Map data, Object primaryKey, AuditReaderImplementor versionsReader, Number revision)` Maps properties from the given map to the given object.
`boolean` | `mapToMapFromEntity(SessionImplementor session, Map<String,Object> data, Object newObj, Object oldObj)` Maps properties to the given map, basing on differences between properties of new and old objects.
`abstract void` | `nullSafeMapToEntityFromMap(AuditConfiguration verCfg, Object obj, Map data, Object primaryKey, AuditReaderImplementor versionsReader, Number revision)` Parameter `obj` is never `null`.
`protected void` | `setPropertyValue(Object targetObject, Object value)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.hibernate.envers.entities.mapper.PropertyMapper
`mapModifiedFlagsToMapForCollectionChange, mapModifiedFlagsToMapFromEntity`

Constructor Detail

### AbstractToOneMapper

    protected AbstractToOneMapper(PropertyData propertyData)

Method Detail

### mapToMapFromEntity

    public boolean mapToMapFromEntity(SessionImplementor session,
                                      Map<String,Object> data,
                                      Object newObj,
                                      Object oldObj)

  Description copied from interface: `PropertyMapper`
  Maps properties to the given map, basing on differences between properties of new and old objects.

  Specified by:
    `mapToMapFromEntity` in interface `PropertyMapper`
  Parameters:
    `session` - The current session.
    `data` - Data to map to.
    `newObj` - New state of the entity.
    `oldObj` - Old state of the entity.
  Returns:
    True if there are any differences between the states represented by newObj and oldObj.

### mapToEntityFromMap

    public void mapToEntityFromMap(AuditConfiguration verCfg,
                                   Object obj,
                                   Map data,
                                   Object primaryKey,
                                   AuditReaderImplementor versionsReader,
                                   Number revision)

  Description copied from interface: `PropertyMapper`
  Maps properties from the given map to the given object.

  Specified by:
    `mapToEntityFromMap` in interface `PropertyMapper`
  Parameters:
    `verCfg` - Versions configuration.
    `obj` - Object to map to.
    `data` - Data to map from.
    `primaryKey` - Primary key of the object to which we map (for relations)
    `versionsReader` - VersionsReader for reading relations
    `revision` - Revision at which the object is read, for reading relations

### mapCollectionChanges

    public List<PersistentCollectionChangeData> mapCollectionChanges(String referencingPropertyName,
                                                                     PersistentCollection newColl,
                                                                     Serializable oldColl,
                                                                     Serializable id)

  Description copied from interface: `PropertyMapper`
  Maps collection changes

  Specified by:
    `mapCollectionChanges` in interface `PropertyMapper`
  Parameters:
    `referencingPropertyName` - Name of the field, which holds the collection in the entity.
    `newColl` - New collection, after updates.
    `oldColl` - Old collection, before updates.
    `id` - Id of the object owning the collection.
  Returns:
    List of changes that need to be performed on the persistent store.

### getEntityInfo

    protected AbstractToOneMapper.EntityInfo getEntityInfo(AuditConfiguration verCfg,
                                                           String entityName)

  Parameters:
    `verCfg` - Audit configuration.
    `entityName` - Entity name.
  Returns:
    Entity class, name and information whether it is audited or not.

### setPropertyValue

    protected void setPropertyValue(Object targetObject,
                                    Object value)

### getPropertyData

    protected PropertyData getPropertyData()

  Returns:
    Bean property that represents the relation.

### nullSafeMapToEntityFromMap

    public abstract void nullSafeMapToEntityFromMap(AuditConfiguration verCfg,
                                                    Object obj,
                                                    Map data,
                                                    Object primaryKey,
                                                    AuditReaderImplementor versionsReader,
                                                    Number revision)

  Parameter `obj` is never `null`.

  See Also:
    `PropertyMapper.mapToEntityFromMap(AuditConfiguration, Object, Map, Object, AuditReaderImplementor, Number)`

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