Hey Shaun,
Yes, an abstract class would declare
an xml-discriminator-node and not provide an xml-discriminator-value.
In regards to the xml-join-node example I can see how you found it
confusing. Let me try a slightly different example to clarify what I'm
trying to accomplish:
// eclipselink-oxm.xml
<java-types>
<java-type name="org.example.Employee">
<xml-root-element name="employee-data" />
<java-attributes>
<xml-attribute java-attribute="id" />
<xml-element java-attribute="address">
<xml-join-nodes>
<xml-join-node xml-path="work-address/@id" referenced-xml-path="@id" />
<xml-join-node xml-path="work-address/@city" referenced-xml-path="city" />
</xml-join-nodes>
</xml-element>
</java-attributes>
</java-type>
<java-type name="org.example.Address">
<xml-root-element name="business-address" />
<java-attributes>
<xml-attribute java-attribute="id" xml-key="true" />
<xml-element java-attribute="city" xml-key="true" />
</java-attributes>
</java-type>
</java-types>
// sample instance document
<root>
<employee-data id="101">
<work-address id="100" city="Ottawa" />
</employee-data>
<employee-data id="102">
<work-address id="100" city="Kanata" />
</employee-data>
<business-address id=100>
<street>99 Some St.</street>
<suite>1001</suite>
<city>Kanata</city>
<postal>K0A3m0</postal>
</business-address>
<business-address id=100>
<street>45 O'Connor St., Suite 400</street>
<suite>400</suite>
<city>Ottawa</city>
<postal>K1P1A4</postal>
</business-address>
<business-address id=200>
<street>1 Anystreet Rd.</street>
<suite>9</suite>
<city>Ottawa</city>
<postal>K4P1A2</postal>
</business-address>
</root>
Please let me know if you have any other questions.
Cheers,
Dave
Shaun Smith wrote:
Hi Dave,
In an inheritance hierarchy would an abstract class declare an
xml-discriminator-node and just not provide an xml-discriminator-value?
In the sample document:
<root>
<employee-data id="100">
<address emp-id="100" type="HOME" />
</employee-data>
<address-data>
<empId>100</empId>
<type>HOME</type>
<street>99 Some St.</street>
<city>Kanata</city>
<postal>K0A3m0</postal>
</address-data>
<address-data>
<empId>100</empId>
<type>WORK</type>
<street>45 O'Connor St., Suite 400</street>
<city>Ottawa</city>
<postal>K1P1A4</postal>
</address-data>
<address-data>
<empId>200</empId>
<type>HOME</type>
<street>1 Anystreet Rd.</street>
<city>Ottawa</city>
<postal>K4P1A2</postal>
</address-data>
</root>
Do I understand that the second and third addresses are
not owned by employee 100? This example is similar to the "standard"
EclipseLink JPA Employee model with Employee having collection of
PhoneNumbers. In that example PhoneNumber has a composite key of the
employee's id and type--which ensures in a relational database that a
given employee could not have two phone numbers of the same type. In
the relational example, unlike in your example, the relationship to
Employee is purely through the PhoneNumber's employee id, and not the
type (see below).
I guess what I'm asking is, can this same type of reference resolution
be expressed: composite key but only part of it used to resolve a
relationship?
Also, the repetition of the Employee's id in both "id" and "emp-id"
seems redundant:
<root>
<employee-data id="100">
<address emp-id="100" type="HOME" />
Shaun
public class Employee implements Serializable {
@Id
@Column(name = "EMP_ID")
@GeneratedValue(strategy = GenerationType.SEQUENCE)
private long id;
...
@OneToMany(mappedBy = "owner", cascade = CascadeType.ALL,
orphanRemoval = true)
private List<PhoneNumber> phoneNumbers = new
ArrayList<PhoneNumber>();
-----------------
@Entity
@Table(name = "PHONE")
@IdClass(PhoneNumber.ID.class)
public class PhoneNumber implements Serializable {
@Id
@Column(updatable = false)
private String type;
...
@Id
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "EMP_ID")
private Employee owner;
On 23/8/2010 4:00 PM, David McCann wrote:
All,
Please review the design Wiki here,
and provide any feedback you may have.
--
David
McCann | Principal Software Engineer | +6132884636
Oracle Server Technologies,
EclipseLink Product
ORACLE Canada | 45 O'Connor St., Suite 400 | Ottawa, Ontario | K1P 1A4
|
Oracle is committed to developing practices and
products that help protect the environment |
_______________________________________________
eclipselink-dev mailing list
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--
Shaun
Smith | Principal Product Manager
Phone: +19055023094
Oracle Server Technologies, Oracle
TopLink
ORACLE Canada | 110 Matheson Boulevard West, Suite 100, Mississauga,
Ontario | L5R 3P4
Oracle
is committed to developing practices and products that help protect the
environment
_______________________________________________
eclipselink-dev mailing list
eclipselink-dev@xxxxxxxxxxx
https://dev.eclipse.org/mailman/listinfo/eclipselink-dev
--
David McCann | Principal Software Engineer | +6132884636
Oracle Server Technologies, EclipseLink
Product
ORACLE Canada | 45 O'Connor St., Suite 400 | Ottawa, Ontario | K1P 1A4
|
Oracle is committed to developing practices and
products that help protect the environment |
|