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https://issues.apache.org/jira/browse/DIRAPI-191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13990276#comment-13990276
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Emmanuel Lecharny commented on DIRAPI-191:
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There is no simple way to do that.
All the information is available in at least two places, now the format is
really dependent on the server you are using.
In apacheDS, you can read the schema from cn=schema, or from ou=schema. They
offer a different vision of the same thing.
ou=schema is the static schema, containing every elements that the server knows
about, but which are not necessary activated (ie, you may not use all of them).
It's ApacheDS specific
cn=schema contains the information about the available elements (ie, those you
can use)
In any case, if you want to get the list of attributes for a given object
class, you first have to load the entry associated to this object class and
read the m-must and m-may attributes (they contain the list of attributes you
can use in an ObjectClass). But this is far from being enough : you have to do
so for every ObjectClass the current objectClass extends... And you may have a
lot !
This is also very specific to ApacheDS.
Another way, which is supposed to be working with any server, would be to load
the cn=schema entry, which contains the list of *all* the ObjectClasses in the
objectClasses attribute. You will get the result in a format you will have to
parse :
( 0.9.2342.19200300.100.4.18 NAME 'friendlyCountry' SUP country STRUCTURAL MUST
co X-SCHEMA 'cosine' )
You can use the ObjectClassDescriptionSchemaParser.parse( String ) method to
parse such an ObjectClass attribute, it will return an instance of teh
ObjectClass java class, and you'll again have to read the may and must values
using the getMayAttributeTypes() and getMustAttributeTypes() methods. Also keep
in mind to prcess the inherited ObjectClasses using the getSuperiors() method.
Last, not least, the cn=schema entry might not be present at the top level : in
LDAP, you may have more than one schema...
Good luck :-)
Side Note : it took us months to implement the schema browser in Apache
Directory Studio, for the exact same reasons plus some other I haven't describe
here...
> How to get attributes list according to objectClass
> ---------------------------------------------------
>
> Key: DIRAPI-191
> URL: https://issues.apache.org/jira/browse/DIRAPI-191
> Project: Directory Client API
> Issue Type: Question
> Affects Versions: 1.0.0-M21
> Reporter: Robert Hou
>
> I want to get attributes list according to specified objectclass, how to
> achieve this purpose using Apahce Directory API? Could anyone share sample
> code here?
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