Hello,
I have application that has a variety of alarms. For now consider
Alarm to be an abstract class that is extended by UpdownAlarm and
JitterAlarm. Note that UpdownAlarm and JitterAlarm can have different
parameters - UpDownAlarm could have parameters that describe the allowed
range of motion and JitterAlarm could have parameters that describe the
allowed acceleration. These alarms are created with an alarm factory.
There is an object called Monitor that contains a field Alarm which can
either be UpdownAlarm or JitterAlarm. My mapping file looks like the
one below.
<?xml version="1.0"?>
<!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Object Mapping DTD Version
1.0//EN"
"http://castor.exolab.org/mapping.dtd";>
<mapping>
<class name="x.y.z.Alarm" auto-complete="false">
<field name="type" type="string" required="true"><bind-xml
name="type" node="attribute"/></field>
</class>
<class name="x.y.z.UpdownAlarm" extends="x.y.z.Alarm" auto-complete="false">
<field name="maxRange" type="string" required="true"><bind-xml
name="maxRange" node="attribute"/></field>
</class>
<class name="x.y.z.JitterAlarm" extends="x.y.z.Alarm" auto-complete="false">
<field name="maxAccel" type="string" required="true"><bind-xml
name="maxAccel" node="attribute"/></field>
</class>
<class name="x.y.z.Monitor" auto-complete="false" >
<field name="name" type="String" required="true"><bind-xml
name="name" node="attribute"/> </field>
<field name="alarm" type="x.y.z.Alarm" required="true"> </field>
</class>
</mapping>
Mapping works fine and produces the following xml:
<?xml version="1.0" encoding="UTF-8"?>
<config>
<monitor name="test">
<alarm type="UpdownAlarm" maxRange="45"/>
</monitor>
<monitor name="test2">
<alarm type="JitterAlarm" maxAccel="95"/>
</monitor>
</config>
At this point I'm stuck. I don't know how to reliably unmarshal the
alarm fields back to UpdownAlarm and JitterAlarm.
Based upon the documentation, I can use a customFieldHandler to
reference my Alarm factory with a valueOf() method, but what about
the extra parameters like 'maxRange' and 'maxAccel'. These are not
defined for the abstract Alarm so I'm sure Castor will throw a parsing
error (I haven't tried that yet).
Can anybody give me some guidance about how to proceed? I'd appreciate
examples or suggestions.
Thanks!
Chuck Kring
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