[castor-dev] Does Castor supply instances of subclasses in a collection of a superclass?

[michael simons]

Hello,

Here's an example:to explain what I mean:

class A {
private D parent;
...
}
class B extends A {...}
class C extends A {...}
class D {
  private Collection entries; // of A or B or C
}
/// mapping.xml ///
<mapping>
        <class name="A" identity="id" key-generator="HIGH-LOW">
                <map-to table="TA" />
                <cache-type type="none" />
                <field name="id" type="java.lang.Long" >
                        <sql name="ID" type="bigint" />
                </field>
                <field name="name" type="java.lang.String" >
                        <sql name="NAME" type="char" />
                </field>
                <field name="parent" type="D">
                        <sql name="PARENTID" />
                </field>
        </class>
        <class name="B" extends="A" identity="id" key-generator="HIGH-LOW">
                <map-to table="TB" />
                <cache-type type="none" />
                <field name="id" type="java.lang.Long" >
                        <sql name="ID" type="bigint" />
                </field>
        </class>
        
        <class name="C" extends="A" identity="id" key-generator="HIGH-LOW">
                <map-to table="TC" />
                <cache-type type="none" />
                <field name="id" type="java.lang.Long" >
                        <sql name="ID" type="bigint" />
                </field>
        </class>
        
        <class name="D" identity="id" key-generator="HIGH-LOW">
                <map-to table="TD" />
                <cache-type type="none" />
                <field name="id" type="java.lang.Long">
                        <sql name="ID" type="bigint" />
                </field>
                <field name="entries" type="A" collection="collection" lazy="true">
                        <sql many-key="PARENTID" />
                </field>
        </class>
</mapping>
Assume there are 1 record in table TB and 1 record in TC. So there must be 
2 records in TA.
When loading an instance of D and accessing its field "entries"

~ Do I get a Collection of 2 objects?
~ Is one of theese objects instaneceof B and one instanceof C or are they 
both just instanceof A?

Regards,
Michael
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