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A new issue has been created in JIRA.
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View the issue:
http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-108
Here is an overview of the issue:
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Key: HB-108
Summary: Mapping non-static inner classes
Type: New Feature
Status: Unassigned
Priority: Minor
Project: Hibernate2
Components:
core
Assignee:
Reporter: Gunther Schadow
Created: Tue, 27 May 2003 6:55 PM
Updated: Tue, 27 May 2003 6:55 PM
Environment: any
Description:
It would be nice if Hibernate could handle true inner classes.
For example, say you have a Person with several addresses:
class Person {
long id,
String name,
List/*<Address>*/ addresses
class Address {
String value;
String purpose;
}
...
}
whereas the database contains the two tables:
CREATE TABLE Person (
id LONG NOT NULL PRIMARY KEY,
name VARCHAR,
)
CREATE TABLE PersonAddress (
personId LONG NOT NULL REFERENCES Person(id),
value VARCHAR,
purpose VARCHAR,
PRIMARY KEY(personId, purpose);
)
and the mapping file would contain
<class name="Person" table="Person">
<id name="id" type="long">...</id>
<property name="name" type="string"/>
<bag name="addresses" lazy="true" table="PersonAddress">
<key column="personId"/>
<composite-element class="Person$Address">
<property name="value" column="value" type="string"/>
<property name="purpose" column="purpose" type="string"/>
</composite-element>
</bag>
</class>
Since personId is NOT NULL in the PersonAddress table, we
know that we allways will have a Person if we load a
PersonAddress, and, since PersonAddress is mapped as a
composite element, we can't even load a Person$Address alone
without having a Person in hand. Therefore all requirements
for creating non-static inner classes are fulfilled.
Workaround is of course to use a static inner class in which
the implicit association to the parent class is made explicit.
Since non-static inner classes are a proper idiom of Java,
the goal of "persistence for idiomatic java" makes proper
handling of non-static inner classes highly desirable.
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