I tried this question on the Ozone Dev list but no reply. Hope you do not
think it's too off topic.
I'm one of the people to volunteer to try to implement support for the
XML:DB api in Ozone and I'm struggling with CollectionImpl.createResource()
and CollectionImpl.storeResource(). What should be the relationships between
org.xmldb.api.base.Collection, org.xmldb.api.base.Resource and
org.ozoneDB.xml.util.XMLContainer? From what i understand of the reference
implementation a Collection ends up being a directory and a resource is a
file that end up in that directory. This to me implies that a Collection
should contain (aggregate) Resources.
For createResource() I had something like the following in mind but I'm not
sure this is a valid route:
public Resource createResource( String id, String type ) throws
XMLDBException {
try {
if ( ( id == null ) || ( id.length() == 0 ) ) {
id = createId();
}
if ( type.equals(XMLResource.RESOURCE_TYPE) ) {
// what to do with this?
return new XMLResourceImpl(database,this,
XMLContainer.newContainer( database, id));
}
else if ( type.equals(BinaryResource.RESOURCE_TYPE) ) {
throw new XMLDBException( ErrorCodes.VENDOR_ERROR,
"BinaryResource: Not yet implemented");
}
else {
throw new XMLDBException(ErrorCodes.UNKNOWN_RESOURCE_TYPE);
}
}
catch (Exception e) {
throw new XMLDBException(ErrorCodes.VENDOR_ERROR, e.toString());
}
}
Then for CollectionImpl.storeResource() i'm not sure how the storage of a
Resource should be viewed. If Collection should aggregate Resources we
should store the resource inside the Collection but then Collection needs to
have a list (Map) of Resources. On the other hand if we were to store it as
a
separate object what denoted its relationship with a Collection?
public void storeResource( Resource res ) throws XMLDBException {
try {
String id = res.getId();
if ((id == null) || (id.length() == 0)) {
id = createId();
}
// what to do with this?
database.createObject( Resource.class.getName(),
OzoneInterface.Public, id);
}
catch (Exception e) {
throw new XMLDBException(ErrorCodes.VENDOR_ERROR,
e.toString());
}
}
Any ideas/suggestions would be very much appreciated.
Best regards,
Per
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