## org.hibernate.property
Class BackrefPropertyAccessor

    java.lang.Object
      org.hibernate.property.BackrefPropertyAccessor

All Implemented Interfaces:
  PropertyAccessor

    public class BackrefPropertyAccessor

extends Object
implements PropertyAccessor

Represents a "back-reference" to the id of a collection owner. A "back-reference" is pertinent in mapping scenarios where we have a uni-directional one-to-many association in which only the many side is mapped. In this case it is the collection itself which is responsible for the FK value.

In this scenario, the one side has no inherent knowledge of its "owner". So we introduce a synthetic property into the one side to represent the association; a so-called back-reference.

Author:
  Gavin King, Steve Ebersole

Nested Class Summary
`class` `BackrefPropertyAccessor.BackrefGetter` Internal implementation of a property getter specific to these back-ref properties.
`static class` `BackrefPropertyAccessor.BackrefSetter` Internal implementation of a property setter specific to these back-ref properties.

Field Summary
`static Serializable` `UNKNOWN` A placeholder for a property value, indicating that we don't know the value of the back reference

Constructor Summary
`BackrefPropertyAccessor(String collectionRole, String entityName)` Constructs a new instance of BackrefPropertyAccessor.

Method Summary
`Getter` `getGetter(Class theClass, String propertyName)` Create a "getter" for the named attribute
`Setter` `getSetter(Class theClass, String propertyName)` Create a "setter" for the named attribute

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

Field Detail

### UNKNOWN

    public static final Serializable UNKNOWN

  A placeholder for a property value, indicating that we don't know the value of the back reference

Constructor Detail

### BackrefPropertyAccessor

    public BackrefPropertyAccessor(String collectionRole,
                                   String entityName)

  Constructs a new instance of BackrefPropertyAccessor.

  Parameters:
    `collectionRole` - The collection role which this back ref references.
    `entityName` - The owner's entity name.

Method Detail

### getSetter

    public Setter getSetter(Class theClass,
                            String propertyName)

  Create a "setter" for the named attribute

  Specified by:
    `getSetter` in interface `PropertyAccessor`
  Parameters:
    `theClass` - The class on which the property is defined.
    `propertyName` - The name of the property.
  Returns:
    An appropriate setter

### getGetter

    public Getter getGetter(Class theClass,
                            String propertyName)

  Create a "getter" for the named attribute

  Specified by:
    `getGetter` in interface `PropertyAccessor`
  Parameters:
    `theClass` - The class on which the property is defined.
    `propertyName` - The name of the property.
  Returns:
    An appropriate getter.

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