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

Nested Classes

Modifier and Type	Class and Description
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

Fields

Modifier and Type	Field and Description
static Serializable	UNKNOWN A placeholder for a property value, indicating that we don't know the value of the back reference

Constructor Summary

Constructors

Constructor and Description
BackrefPropertyAccessor(String collectionRole, String entityName) Constructs a new instance of BackrefPropertyAccessor.

Method Summary

Methods

Modifier and Type	Method and Description
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.