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Posted to ojb-dev@db.apache.org by Leandro Rodrigo Saad Cruz <le...@ibnetwork.com.br> on 2003/02/18 19:48:35 UTC
[PROPOSAL] collection inheritance
Hi all, I'd like to propose ( actually commit my changes to
src/java/org/apache/ojb/broker/metadata/RepositoryXmlHandler.java )
a new feature to RepositoryXmlHandler in order to make mapping objects
to the database simpler. What I have working today makes all collection
descriptors (CLDs) available to all extent classes of a class that is
not an interface !
Example. Consider this class hierarchy :
public abstract class BaseFoo
{
private List myCollection;
}
public class FooImpl
extends BaseFoo
{
}
With my proposal this should map to ->
<class-descriptor class="BaseFoo">
<extent-class class-ref="FooImpl"/>
...
<collection-descriptor name="myCollection"
element-class-ref=""
auto-retrieve="true"
auto-update="false"
auto-delete="false"
indirection-table="SOME_TABLE"
>
<fk-pointing-to-this-class column="FOO_ID"/>
<fk-pointing-to-element-class column="SOME_CLASS_ID"/>
</collection-descriptor>
</class-descriptor>
<class-descriptor class="FooImpl">
... <<-- CLDs already defined :-)
</class-descriptor>
This is working only with CLDS, not reference descriptors or any other
type of descriptor.
What do you think ?
In my app, I have about 15 classes that benefit from collection
inheritance.
--
Leandro Rodrigo Saad Cruz
IT - Inter Business Tecnologia e Servicos (IB)
http://www.ibnetwork.com.br
http://jakarta.apache.org/ojb
Re: [PROPOSAL] collection inheritance
Posted by Leandro Rodrigo Saad Cruz <le...@ibnetwork.com.br>.
I'm inheriting only collection descriptors, not reference or field
descriptors, Maybe the specification on wich descriptors to inherit on
each class would be a good thing, something like:
<class-descriptor>
<collection-descriptor id-from-other-class="1"
inherit-from="myPackage.OtherClass"
/>
<reference-descriptor id-from-other-class="2"
inherit-from="myPackage.OtherClass"
/>
</class-descriptor>
Any suggestions ?
On Wed, 2003-02-19 at 13:28, Jakob Braeuchi wrote:
> hi leandro,
>
> do you only inherit collection descriptors or reference- and field
> descriptors as well ?
> maybe we should be able to specify on class-descriptor level which
> descriptors we'd like to inherit.
>
> just my 0.02 CHF
>
> jakob
>
> Leandro Rodrigo Saad Cruz wrote:
>
> >Hi all, I'd like to propose ( actually commit my changes to
> >src/java/org/apache/ojb/broker/metadata/RepositoryXmlHandler.java )
> >a new feature to RepositoryXmlHandler in order to make mapping objects
> >to the database simpler. What I have working today makes all collection
> >descriptors (CLDs) available to all extent classes of a class that is
> >not an interface !
> >
> >Example. Consider this class hierarchy :
> >
> >public abstract class BaseFoo
> >{
> > private List myCollection;
> >}
> >
> >public class FooImpl
> > extends BaseFoo
> >{
> >
> >}
> >
> >With my proposal this should map to ->
> >
> ><class-descriptor class="BaseFoo">
> > <extent-class class-ref="FooImpl"/>
> > ...
> > <collection-descriptor name="myCollection"
> > element-class-ref=""
> > auto-retrieve="true"
> > auto-update="false"
> > auto-delete="false"
> > indirection-table="SOME_TABLE"
> > >
> > <fk-pointing-to-this-class column="FOO_ID"/>
> > <fk-pointing-to-element-class column="SOME_CLASS_ID"/>
> > </collection-descriptor>
> ></class-descriptor>
> >
> ><class-descriptor class="FooImpl">
> >
> >... <<-- CLDs already defined :-)
> >
> >
> ></class-descriptor>
> >
> >This is working only with CLDS, not reference descriptors or any other
> >type of descriptor.
> >
> >What do you think ?
> >
> >In my app, I have about 15 classes that benefit from collection
> >inheritance.
> >
> >
> >
> >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-dev-help@db.apache.org
>
>
--
Leandro Rodrigo Saad Cruz
IT - Inter Business Tecnologia e Servicos (IB)
http://www.ibnetwork.com.br
http://jakarta.apache.org/ojb
Re: [PROPOSAL] collection inheritance
Posted by Jakob Braeuchi <jb...@gmx.ch>.
hi leandro,
do you only inherit collection descriptors or reference- and field
descriptors as well ?
maybe we should be able to specify on class-descriptor level which
descriptors we'd like to inherit.
just my 0.02 CHF
jakob
Leandro Rodrigo Saad Cruz wrote:
>Hi all, I'd like to propose ( actually commit my changes to
>src/java/org/apache/ojb/broker/metadata/RepositoryXmlHandler.java )
>a new feature to RepositoryXmlHandler in order to make mapping objects
>to the database simpler. What I have working today makes all collection
>descriptors (CLDs) available to all extent classes of a class that is
>not an interface !
>
>Example. Consider this class hierarchy :
>
>public abstract class BaseFoo
>{
> private List myCollection;
>}
>
>public class FooImpl
> extends BaseFoo
>{
>
>}
>
>With my proposal this should map to ->
>
><class-descriptor class="BaseFoo">
> <extent-class class-ref="FooImpl"/>
> ...
> <collection-descriptor name="myCollection"
> element-class-ref=""
> auto-retrieve="true"
> auto-update="false"
> auto-delete="false"
> indirection-table="SOME_TABLE"
> >
> <fk-pointing-to-this-class column="FOO_ID"/>
> <fk-pointing-to-element-class column="SOME_CLASS_ID"/>
> </collection-descriptor>
></class-descriptor>
>
><class-descriptor class="FooImpl">
>
>... <<-- CLDs already defined :-)
>
>
></class-descriptor>
>
>This is working only with CLDS, not reference descriptors or any other
>type of descriptor.
>
>What do you think ?
>
>In my app, I have about 15 classes that benefit from collection
>inheritance.
>
>
>
>
Re: [PROPOSAL] collection inheritance
Posted by Leandro Rodrigo Saad Cruz <le...@ibnetwork.com.br>.
On Tue, 2003-02-18 at 16:02, Phil Warrick wrote:
> Leandro,
>
> While not being a hard-core ojb developer, I would pitch in here and say
> "yes please"! If this could eventually be extended to all descriptors
> it would reduce my repository size by about a factor of five and of
> course make maintenance much less error prone...
>
> Phil
nice ! my repository file size was greatly reduced !
if this don't go to the cvs repo, I'll send you the patch !
>
> Leandro Rodrigo Saad Cruz wrote:
> > Hi all, I'd like to propose ( actually commit my changes to
> > src/java/org/apache/ojb/broker/metadata/RepositoryXmlHandler.java )
> > a new feature to RepositoryXmlHandler in order to make mapping objects
> > to the database simpler. What I have working today makes all collection
> > descriptors (CLDs) available to all extent classes of a class that is
> > not an interface !
> >
> > Example. Consider this class hierarchy :
> >
> > public abstract class BaseFoo
> > {
> > private List myCollection;
> > }
> >
> > public class FooImpl
> > extends BaseFoo
> > {
> >
> > }
> >
> > With my proposal this should map to ->
> >
> > <class-descriptor class="BaseFoo">
> > <extent-class class-ref="FooImpl"/>
> > ...
> > <collection-descriptor name="myCollection"
> > element-class-ref=""
> > auto-retrieve="true"
> > auto-update="false"
> > auto-delete="false"
> > indirection-table="SOME_TABLE"
> > >
> > <fk-pointing-to-this-class column="FOO_ID"/>
> > <fk-pointing-to-element-class column="SOME_CLASS_ID"/>
> > </collection-descriptor>
> > </class-descriptor>
> >
> > <class-descriptor class="FooImpl">
> >
> > ... <<-- CLDs already defined :-)
> >
> >
> > </class-descriptor>
> >
> > This is working only with CLDS, not reference descriptors or any other
> > type of descriptor.
> >
> > What do you think ?
> >
> > In my app, I have about 15 classes that benefit from collection
> > inheritance.
> >
> >
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-dev-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-dev-help@db.apache.org
>
>
--
Leandro Rodrigo Saad Cruz
IT - Inter Business Tecnologia e Servicos (IB)
http://www.ibnetwork.com.br
http://jakarta.apache.org/ojb
Re: [PROPOSAL] collection inheritance
Posted by Phil Warrick <wa...@bmed.mcgill.ca>.
Leandro,
While not being a hard-core ojb developer, I would pitch in here and say
"yes please"! If this could eventually be extended to all descriptors
it would reduce my repository size by about a factor of five and of
course make maintenance much less error prone...
Phil
Leandro Rodrigo Saad Cruz wrote:
> Hi all, I'd like to propose ( actually commit my changes to
> src/java/org/apache/ojb/broker/metadata/RepositoryXmlHandler.java )
> a new feature to RepositoryXmlHandler in order to make mapping objects
> to the database simpler. What I have working today makes all collection
> descriptors (CLDs) available to all extent classes of a class that is
> not an interface !
>
> Example. Consider this class hierarchy :
>
> public abstract class BaseFoo
> {
> private List myCollection;
> }
>
> public class FooImpl
> extends BaseFoo
> {
>
> }
>
> With my proposal this should map to ->
>
> <class-descriptor class="BaseFoo">
> <extent-class class-ref="FooImpl"/>
> ...
> <collection-descriptor name="myCollection"
> element-class-ref=""
> auto-retrieve="true"
> auto-update="false"
> auto-delete="false"
> indirection-table="SOME_TABLE"
> >
> <fk-pointing-to-this-class column="FOO_ID"/>
> <fk-pointing-to-element-class column="SOME_CLASS_ID"/>
> </collection-descriptor>
> </class-descriptor>
>
> <class-descriptor class="FooImpl">
>
> ... <<-- CLDs already defined :-)
>
>
> </class-descriptor>
>
> This is working only with CLDS, not reference descriptors or any other
> type of descriptor.
>
> What do you think ?
>
> In my app, I have about 15 classes that benefit from collection
> inheritance.
>
>