For my application i need to store additional information about objects. this additional information is not part of the object properties. And using this additional information I want to filter the results using the Hibernate filters.

Say for example I have a class 'Fish' :

public class Fish {
int id;
String name;
String color;
}

and mapping is:
<class name="Fish" table="FISH" batch-size="10">
<id name="pid" type="long" column="PK_pid" access="property"/>
<property name="name" column="name" type="java.lang.String" access="property" not-null="true" unique="false"/>
<property name="color" column="color" type="java.lang.String" length="1024" access="property" not-null="false" unique="false"/>
</class>

Now along with this information for each fish object in my application i want to store the id for the user who created the object. But I do not want to model it as a property of the Fish class itself.
Is there a way for me to specify an extra column "owner" for the Fish table.
I want to be able to filter out the objects on the basis of this "owner" value and be able to also specify and persist the owner value at the time of save/update.
My filter definition is:
<filter-def name="ownerFilter">
<filter-param name="ownerFilterParam" type="string"/>
</filter-def>

And I want to be able to specify it for the Fish class as shown below:
<class name="Fish" table="FISH" batch-size="10">
<id name="pid" type="long" column="PK_pid" access="property"/>
<property name="name" column="name" type="java.lang.String" access="property" not-null="true" unique="false"/>
<property name="color" column="color" type="java.lang.String" length="1024" access="property" not-null="false" unique="false"/>

<filter name="ownerFilter" condition=":ownerFilterParam = owner"/>

</class>

Such that when this filter is enabled this for the session only fishes for a particular owner are retrieved.

Is it possible to specify additional columns for a table that are not part of the object mapped to that table?

I would highly appreciateI would really appreciate any information/links as to how this can be achieved.

Thank in advance.

I managed to solve my problem, by using custom property accessors.
Just posting teh summary of my solution incase someone else is facing the same issue.
I added a propety mapping in the hbm file even though there is no-such property for my object. And in this mapping I have specified custome property accessors. With the custome property accessors I can control what i set or give or from where I give the value.