MiddleComponentMapper (Hibernate JavaDocs)
Date: 2012-04-05

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## org.hibernate.envers.entities.mapper.relation.component
Interface MiddleComponentMapper

All Known Implementing Classes:
  MiddleDummyComponentMapper, MiddleMapKeyIdComponentMapper, MiddleMapKeyPropertyComponentMapper, MiddleRelatedComponentMapper, MiddleSimpleComponentMapper, MiddleStraightComponentMapper

    public interface MiddleComponentMapper

Method Summary
`void` | `addMiddleEqualToQuery(Parameters parameters, String prefix1, String prefix2)` Adds query statements, which contains restrictions, which express the property that part of the middle entity with alias prefix1, is equal to part of the middle entity with alias prefix2 (the entity is the same).
`void` | `mapToMapFromObject(Map<String,Object> data, Object obj)` Maps from an object to the object's map representation (for an entity - only its id).
`Object` | `mapToObjectFromFullMap(EntityInstantiator entityInstantiator, Map<String,Object> data, Object dataObject, Number revision)` Maps from full object data, contained in the given map (or object representation of the map, if available), to an object.

Method Detail

### mapToObjectFromFullMap

    Object mapToObjectFromFullMap(EntityInstantiator entityInstantiator,
                                  Map<String,Object> data,
                                  Object dataObject,
                                  Number revision)

  Maps from full object data, contained in the given map (or object representation of the map, if available), to an object.

  Parameters:
    `entityInstantiator` - An entity instatiator bound with an open versions reader.
    `data` - Full object data.
    `dataObject` - An optional object representation of the data.
    `revision` - Revision at which the data is read.
  Returns:
    An object with data corresponding to the one found in the given map.

### mapToMapFromObject

    void mapToMapFromObject(Map<String,Object> data,
                            Object obj)

  Maps from an object to the object's map representation (for an entity - only its id).

  Parameters:
    `data` - Map to which data should be added.
    `obj` - Object to map from.

### addMiddleEqualToQuery

    void addMiddleEqualToQuery(Parameters parameters,
                               String prefix1,
                               String prefix2)

  Adds query statements, which contains restrictions, which express the property that part of the middle entity with alias prefix1, is equal to part of the middle entity with alias prefix2 (the entity is the same). The part is the component's representation in the middle entity.

  Parameters:
    `parameters` - Parameters, to which to add the statements.
    `prefix1` - First alias of the entity + prefix to add to the properties.
    `prefix2` - Second alias of the entity + prefix to add to the properties.

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