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Subject: AW: [sdo] Issue 118 - Proposal for review
Hi Everyone,
Sorry, when writing the agenda I somehow oversaw Frank's email describing his proposal.
I'm a little confused by the notion of the XSD generation of wrapper types, and by the creation of wrapper types through the API, as in the code samples below. This is *much* more detailed that the original propsal.
We were thinking of implementing this with a single Wrapper type, and creating "value" properties... having the infrastructure create an arbitrary number of wrapper types (one for each simple type in SDO, and one for each simple type in the user's context) just sound like a mess to me. Other implementations might decide differently. I liked the original proposal, as it allowed for both approaches. In both approaches Wrapper.isInstance(someObject) returns the same value. And someObject.get("value") returns the simple value. I don't see a use case for creating wrapper types in a portable way through an API. And I sure don't see a use-case for generating XSD that includes wrapper types. Are these directions where others want to go?
Best Regards,
Ron
________________________________
Von: Blaise Doughan [mailto:blaise.doughan@oracle.com]
Gesendet: Mo 08.09.2008 21:28
An: sdo@lists.oasis-open.org
Betreff: Re: [sdo] Issue 118 - Proposal for review
Hi Frank,
In order to support the proposed solution for SDO-118, we (Oracle) would
also require wording in the spec that indicates the XSD generation from
wrapper types is special, and is not required to look like the following:
<xsd:complexType name="VendorIntWrapper">
<xsd:complexContent>
<xsd:extension base="sdo:DataTypeWrapper">
<xsd:sequence>
<xsd:element name="value" type="xsd:int"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
-Blaise
Frank Budinsky wrote:
> Hi Blaise,
>
> Yes, that's right. Wrapper types are really implementation dependent and
> special. An XML serializer needs to provide special handling for wrapper
> types.
>
> Also, user's shouldn't be working with wrapper types directly anyway. The
> user would do this instead:
>
> DataObject intWrapperDO = dataFactory.create("commonj.sdo", "Int");
> intWrapperDO.setInt("value", 7);
> xmlHelper.save(intWrapperDO, "urn:example", "root", System.out);
>
> The implementation, knowing it's a wapper, would serialize it correctly:
>
> <root xmlns="urn:example">7</root>
>
> Frank.
>
>
>
>
> Blaise Doughan <blaise.doughan@oracle.com>
> 09/08/2008 01:50 PM
>
> To
> sdo@lists.oasis-open.org
> cc
>
> Subject
> Re: [sdo] Issue 118 - Proposal for review
>
>
>
>
>
>
> Hi Frank,
>
> That schema fragment does not match my expectations for wrapper types.
>
> For the following code fragment:
> DataObject intWrapperDO = dataFactory.create("vendor.package",
> "VendorIntWrapper");
> intWrapperDO.setInt(7);
> xmlHelper.save(intWrapperDO, "urn:example", "root", System.out);
>
> I would expect the above to return:
> <root xmlns="urn:example">7</root>
>
> And not:
> <root xmlns="urn:example">
> <value>7</value>
> </root>
>
> -Blaise
>
>
> Frank Budinsky wrote:
> VendorIntWrapper is implementation specific, so I can't say exactly what
> it looks like. It could look something like this:
>
> <xsd:complexType name="VendorIntWrapper">
> <xsd:complexContent>
> <xsd:extension base="sdo:DataTypeWrapper">
> <xsd:sequence>
> <xsd:element name="value" type="xsd:int"/>
> </xsd:sequence>
> </xsd:extension>
> </xsd:complexContent>
> </xsd:complexType>
>
> Frank.
>
>
>
>
>
> Blaise Doughan <blaise.doughan@oracle.com>
> 09/08/2008 11:01 AM
>
> To
> sdo@lists.oasis-open.org
> cc
>
> Subject
> Re: [sdo] Issue 118 - Proposal for review
>
>
>
>
>
>
> Hi Frank,
>
> Can you provide the expected schema resulting from the following call
> (assuming VendorIntWrapper extends DataTypeWrapper):
>
> list.add(typeHelper.getType("commonj.sdo", "DataTypeWrapper"));
> list.add(typeHelper.getType("vendor.package", "VendorIntWrapper"));
> xsdHelper.define(list);
>
> -Blaise
>
>
> Frank Budinsky wrote:
> Here is the proposal that that we discussed in today's TC call:
>
> 1. Add the following abstract type to sdoModel.xsd:
>
> <xsd:complexType name="DataTypeWrapper" abstract="true"/>
>
> 2. Users can use this type to determine when a DataObject is a wrapper:
>
> DataObject someObject = ...
> Type dataTypeWrapperType = typeHelper.getType("commonj.sdo",
> "DataTypeWrapper");
> if (dataTypeWrapperType.isInstance(someObject)) ... // "someObject" is a
>
>
> wrapper
>
> The actual type of a wrapper object is implementation dependent, but it
> will always extend from {commonj.sdo}DataTypeWrapper.
>
> Wrapper types are the special implementation-dependant types used to hold
> a simpleType value for an XMLDocument rootObject or for the value of an
> anyType property. Formally defined complexTypes that extend simpleType are
>
>
> not considered wrapper types (i.e., they will not extend DataTypeWrapper),
>
>
> even though they also have a "value" property.
>
> Frank.
>
>
>
>
> Frank Budinsky/Toronto/IBM@IBMCA
> 08/20/2008 03:51 PM
>
> To
> sdo@lists.oasis-open.org
> cc
>
> Subject
> Re: Fw: [sdo] Issue 118 - Creating wrapper objects for simple types
>
>
>
>
>
>
> Hi Blaise,
>
> The two cases that I remember were:
>
> 1) reading an anyType property, which maps to sdo:DataObject, but it may
> be just a DataType value.
> 2) the root element of an XMLDocument, which is always returned as a
> DataObject, even if the actual document simply had a simple DataType at
> the root.
>
> Frank.
>
>
>
>
> Blaise Doughan <blaise.doughan@oracle.com>
> 08/20/2008 03:24 PM
>
> To
> sdo@lists.oasis-open.org
> cc
>
> Subject
> Re: Fw: [sdo] Issue 118 - Creating wrapper objects for simple types
>
>
>
>
>
>
> Hi Frank,
>
> For what use case does the user need to know if the type is a data type
> wrapper?
>
> -Blaise
>
> Frank Budinsky wrote:
>
> Unless somebody can think of a better approach, I'd like to suggest that
>
>
>
>
> we also vote on this in next weeks call.
>
> Thanks,
> Frank
>
> ----- Forwarded by Frank Budinsky/Toronto/IBM on 08/20/2008 03:15 PM
>
> -----
>
> Frank Budinsky/Toronto/IBM
> 08/18/2008 05:19 PM
>
> To
> sdo@lists.oasis-open.org
> cc
>
> Subject
> [sdo] Issue 118 - Creating wrapper objects for simple types
>
>
>
>
>
> If I'm not mistaken, SDO 118 has already been resolved in JSR235. We've
> agreed that DataFactory.create(someSimpleType) must return a wrapper.
>
> What's still missing, is a way for clients to know if a type is a
>
> wrapper.
>
> Proposal: Type.isDataTypeWrapper(). This would return true for any type
> that has the special "value" property (including formally defined types
>
> in
>
> an XSD).
>
> Please let me know if you have any comments or better alternatives?
>
> Thanks,
> Frank.
>
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