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From "Doug Davis" <>
Subject Re: Bean Class/Bean Class Helper Generation
Date Mon, 11 Mar 2002 23:08:47 GMT
One thing you might want to consider is combining any such helper
class with a BeanInfo class that users might have already created
for their beans.  Having 2 classes that contain metadata about a
bean isn't as clean as 1.

R J Scheuerle Jr/Austin/IBM@IBMUS on 03/11/2002 05:14:50 PM

Please respond to

Subject:    Bean Class/Bean Class Helper Generation

There have been several recent changes to the Bean Class generation to
support more advanced
xml features...namely attributes.

I applaud the new functionality, but we need to step back and consider a
more flexible architectural direction.

I would like to see all of the meta data information removed from the java
bean class and placed in a
Helper class that extends a Helper interface.  Here is a first pass at the
Helper interface:

interface Helper {
  public org.apache.axis.description.TypeDesc getTypeDesc();

  public org.apache.axis.encoding.Serializer getSerializerAs(String

  public org.apache.axis.encoding.Deserializer getDeserializerAs(String

The generated bean class should contain ONLY the getters/setters describing
the bean (and perhaps
the equals() method...which needs some work).    This would adequately
the logical bean from the serialization/deserialization of the bean.

The BeanSerializerFactory/BeanDeserializerFactory could be tweaked to
always look for a corresponding
Helper class to find the meta data or find the custom
serializer/deserializer.  The generic serializer/deserializer
classes should use default behaviour if the helper class is not available.
(In fact I am in favor of having
separate meta data aware serializers/deserializers.)

Separating the bean and the bean helper would allow users to provide custom
Helper emitters to
add custom serializers etc.

Please comment.

Rich Scheuerle
XML & Web Services Development
512-838-5115  (IBM TL 678-5115)

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