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EclipseLink/DesignDocs/317962/Phase3
Phase 3 - MOXy Equivalents of Relevant JPA Annotations
This phase of development involves providing additional MOXy annotations and XML metadata support equivalent to that of any relevant JPA annotations.
Annotations/XML Metadata
The following MOXy annotations/XML metadata will be targeted in this phase:
JPA Annotation | MOXy Annotation | XML Metadata Tag | Package | Type | Field | Method |
---|---|---|---|---|---|---|
DiscriminatorColumn | XmlDiscriminatorNode | xml-discriminator-node | X | |||
DiscriminatorValue | XmlDiscriminatorValue | xml-discriminator-value | X | |||
JoinColumn | XmlJoinNode | xml-join-node | X | X | ||
JoinColumns | XmlJoinNodes | xml-join-nodes | X | X |
Inheritance Support
XmlDiscriminatorNode
Purpose
Provide a means to set the class indicator field name when using inheritance.
Java Metadata
package org.eclipse.persistence.oxm.annotations; @Target({TYPE}) @Retention(RUNTIME) public @interface XmlDiscriminatorNode { String value(); }
XML Metadata
xml-discriminator-node
The xml-discriminator-node
metadata tag will be used to set the class indicator field name when using inheritance. The value will be in the form of an XPath to an attribute, i.e. @xsi:type
.
eclipselink-oxm.xml snippet
<java-type name="org.example.Vehicle" xml-discriminator-node="@vtype">
XmlDiscriminatorValue
Purpose
Provide a means to set a class indicator when using inheritance.
Java Metadata
package org.eclipse.persistence.oxm.annotations; @Target({TYPE}) @Retention(RUNTIME) public @interface XmlDiscriminatorValue { String value(); }
XML Metadata
xml-discriminator-value
The xml-discriminator-value
metadata tag will be used to set a class indicator when using inheritance.
eclipselink-oxm.xml snippet
<java-type name="org.example.Car" xml-discriminator-value="car">
XML Schema
Following is the proposed XSD change necessary to provide support for inheritance:
<xs:element name="java-type"> <xs:complexType> <xs:all> <xs:element ref="xml-type" minOccurs="0"/> <xs:element ref="xml-root-element" minOccurs="0"/> <xs:element ref="xml-see-also" minOccurs="0"/> <xs:element ref="xml-java-type-adapter" minOccurs="0"/> <xs:element ref="xml-class-extractor" minOccurs="0"/> <xs:element ref="xml-properties" minOccurs="0" /> <xs:element name="java-attributes" minOccurs="0"> <xs:complexType> <xs:sequence> <xs:element ref="java-attribute" minOccurs="0" maxOccurs="unbounded" /> </xs:sequence> </xs:complexType> </xs:element> </xs:all> <xs:attribute name="name" type="xs:string" /> <xs:attribute name="xml-accessor-order" type="xml-access-order" default="UNDEFINED" /> <xs:attribute name="xml-accessor-type" type="xml-access-type" default="PUBLIC_MEMBER" /> <xs:attribute name="xml-customizer" type="xs:string" /> <xs:attribute name="xml-discriminator-node" type="xs:string" /> <xs:attribute name="xml-discriminator-value" type="xs:string" /> <xs:attribute name="xml-inline-binary-data" type="xs:boolean" default="false" /> <xs:attribute name="xml-transient" type="xs:boolean" default="false" /> </xs:complexType> </xs:element>
Example
The following example will demonstrate how inheritance can be configured.
Using the xml-discriminator-node
and xml-discriminator-value
EclipseLink XML metadata tags to set the class indicator field name and class indicator(s) can be accomplished as follows:
<java-types> <java-type name="org.example.Vehicle" xml-discriminator-node="@vtype" xml-discriminator-value="vehicle"> <xml-root-element name="vehicle-data" /> <java-attributes> <xml-element java-attribute="topSpeed" name="top-speed" /> </java-attributes> </java-type> <java-type name="org.example.Car" xml-discriminator-value="car"> <xml-root-element name="car-data" /> <java-attributes> <xml-element java-attribute="numberOfDoors" name="number-of-doors" /> <xml-element java-attribute="milesPerGallon" name="miles-per-gallon" /> </java-attributes> </java-type> </java-types>
Setting the class indicator field name and class indicator(s) via Annotations would be accomplished as follows:
org.example.Vehicle.java
package org.example; import org.eclipse.persistence.oxm.annotations.XmlDiscriminatorNode; import org.eclipse.persistence.oxm.annotations.XmlDiscriminatorValue; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; @XmlRootElement("vehicle-data") @XmlDiscriminatorNode("@vtype") @XmlDiscriminatorValue("vehicle") class Vehicle { public String model; public String manufacturer; @XmlElement(name="top-speed") public int topSpeed; }
org.example.Car.java
package org.example; import org.eclipse.persistence.oxm.annotations.XmlDiscriminatorValue; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; @XmlRootElement("car-data") @XmlDiscriminatorValue("car") class Car { @XmlElement(name="number-of-doors") public int numberOfDoors; @XmlElement(name="miles-per-gallon") public int milesPerGallon; }
Sample XML Instance Document
<vehicle-data vtype="car"> <model>Mustang GT</model> <manufacturer>Ford</manufacturer> <top-speed>354</top-speed> <number-of-doors>2</number-of-doors> <miles-per-gallon>26</miles-per-gallon> </vehicle-data>
Relationship Mapping Support
We currently support relationship mappings through @ID/@IDREF annotations, and xml-id/xml-idref metadata tags. There are a number of limitations when using these:
- ID property must be of type String
- Target class of an IDREF must have an ID property
- Since a given class can have at most one ID property, there is no way to configure composite keys
Use of XmlJoinNode(s)
will allow one or more properties in the target class to be used as the key for a relationship mapping.
XmlJoinNodes
Purpose
XmlJoinNodes
is used to group one or more XmlJoinNode
entries. Please see XmlJoinNode below for examples of use.
Java Metadata
package org.eclipse.persistence.oxm.annotations; @Target({METHOD, FIELD}) @Retention(RUNTIME) public @interface XmlJoinNodes { XmlJoinNode[] value(); }
XML Metadata
xml-join-nodes
xml-join-nodes
will be used to group one or more xml-join-node
entries. Please see xml-join-node below for examples of use.
XmlJoinNode
Purpose
XmlJoinNode
identifies a key in the target object. For composite keys, XmlJoinNodes
can be used.
Java Metadata
package org.eclipse.persistence.oxm.annotations; @Target({METHOD, FIELD}) @Retention(RUNTIME) public @interface XmlJoinNode { String name() default ""; // are the following relevant? String referencedColumnName() default ""; boolean unique() default false; boolean nullable() default true; boolean insertable() default true; boolean updatable() default true; String columnDefinition() default ""; String table() default ""; }
XML Metadata
xml-join-node
eclipselink-oxm.xml snippet
<xml-element java-attribute="address"> <xml-join-nodes> <xml-join-node name="empId" /> <xml-join-node name="type" /> </xml-join-nodes> </xml-element>
Example
Testing
This section identifies the test package(s) for each feature outlined on this page.
XML Metadata
XML Metadata | Package |
---|---|
xml-discriminator-node | org.eclipse.persistence.testing.jaxb.externalizedmetadata.inheritance
|
xml-discriminator-value | org.eclipse.persistence.testing.jaxb.externalizedmetadata.inheritance
|
Annotations
Annotation | Package |
---|---|
|
Open Issues
This section lists open issues.
Issue# | Description/Notes |
---|---|
1 |
Decisions
This section lists decisions made. These are intended to document the resolution of open issues or constraints added to the project that are important.
Decision# | Description/Notes | Decision |
---|---|---|
1 |