'Re: [jibx-users] Defaull values for attributes.'

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List:       jibx-users
Subject:    Re: [jibx-users] Defaull values for attributes.
From:       Alexander Pokahr <pokahr () informatik ! uni-hamburg ! de>
Date:       2005-06-23 7:53:53
Message-ID: 42BA6A91.7030103 () informatik ! uni-hamburg ! de
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Hi Dennis,

thanks for the reply.
I will think about it.

Regards,
Alex


Dennis Sosnoski wrote:
> That's an interesting point - part of the reason for always writing the 
> value is to allow object reuse when unmarshalling, but that does create 
> the duplication of effort when you want the classes initialized properly 
> for direct creation. You're welcome to enter an enhancement request for 
> this issue in Jira. Perhaps what's really needed is something like an 
> additional choice besides "optional" and "required", along the lines of 
> "skip-missing".
> 
>  - Dennis
> 
> Alexander Pokahr wrote:
> 
>> Hi again,
>>
>> This works, but is somewhat awkward as i have
>> to duplicate the default value in the binding.xml
>> and in the Java class given that I want to have
>> objects created directly (i.e. "new MyClass()")
>> also initialized with proper default values.
>>
>> But thanks anyway for the quick reply.
>>
>> Kind regards,
>> Alex
>>
>> Dan Cooperstock wrote:
>>
>>> JiBX always sets every field in the class, whether it is optional or
>>> not. You can use the default="value" attribute in JiBX to set defaults.
>>>
>>> -------------------------------------------------------------------
>>> Dan Cooperstock, Senior Software Developer, Quest Software
>>> 260 King St. E., Toronto ON Canada  M5A 4L5
>>> dan.cooperstock@quest.com    416-933-5165
>>>  
>>> With Quest Software, you can expect more ... more performance, more
>>> productivity, more value from your IT investments.
>>>
>>> Visit www.quest.com to learn how.
>>>
>>>
>>> -----Original Message-----
>>> From: jibx-users-admin@lists.sourceforge.net
>>> [mailto:jibx-users-admin@lists.sourceforge.net] On Behalf Of Alexander
>>> Pokahr
>>> Sent: Wednesday, June 15, 2005 9:52 AM
>>> To: jibx-users@lists.sourceforge.net
>>> Subject: [jibx-users] Defaull values for attributes.
>>>
>>> Hi all,
>>>
>>> I have an XML schema which contains default values for some attributes,
>>> so that these can be omitted in XML files.
>>>
>>> I thought, a good way to map this to Java would be to have fields which
>>> are initialized to this default value.
>>>
>>> Unfortunately, JiBX overwrites these fields in any case (even when the
>>> attribute is omitted in the XML file).
>>>
>>> I attached a small test case that I did to verify this behaviour.
>>>
>>> When I run the test it prints:
>>> "Test value is: null"
>>>
>>> I would rather expect:
>>> "Test value is: default value"
>>>
>>> Is this a bug in JiBX, or is there a reason, why the initial field value
>>> gets overwritten?
>>>
>>> Thanks,
>>> Alex
>>>
>>>
>>> -- test_binding.xml:
>>>
>>> <?xml version="1.0" encoding="UTF-8"?>
>>> <binding>
>>>
>>>     <mapping class="Test" name="test">
>>>         <value name="value" field="value" usage="optional"
>>> style="attribute"/>
>>>     </mapping>
>>>
>>> </binding>
>>>
>>>
>>> -- test.xml:
>>>
>>> <?xml version="1.0" encoding="UTF-8"?>
>>> <test/>
>>>
>>>
>>> -- Test.java:
>>>
>>> import java.io.FileInputStream;
>>>
>>> import org.jibx.runtime.BindingDirectory;
>>> import org.jibx.runtime.IBindingFactory; import
>>> org.jibx.runtime.IUnmarshallingContext;
>>>
>>> public class Test
>>> {
>>>     private String value = "default value";
>>>
>>>     public static void main(String[] args)
>>>     {
>>>         try
>>>         {
>>>             // Read an object from xml
>>>             IBindingFactory bfa =
>>> BindingDirectory.getFactory(Test.class);
>>>             IUnmarshallingContext uc =
>>> bfa.createUnmarshallingContext();
>>>             Test t = (Test)uc.unmarshalDocument(new
>>> FileInputStream("test.xml"), null);
>>>             System.out.println("Test value is: "+t.value);
>>>         }
>>>         catch(Exception e)
>>>         {
>>>             e.printStackTrace();
>>>         }
>>>     }
>>> }
>>>
>>>
>>>
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>>
>>
>>
>>
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> 
> 
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