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Problem loading a resource with renamed feature [message #718441]

Wed, 24 August 2011 06:41

Eclipse User

Hi,

I'm working on an EMF-based data model which is serialized to XML. This file must follow the OPF specification which means that certain features must be renamed. This is solved using ExtendedMetaData in the ECore model. as such:

    <eStructuralFeatures xsi:type="ecore:EAttribute" name="uniqueIdentifier" lowerBound="1"
        eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString">
      <eAnnotations source="http:///org/eclipse/emf/ecore/util/ExtendedMetaData">
        <details key="name" value="unique-identifier"/>
      </eAnnotations>
    </eStructuralFeatures>

An example result file looks like this (generated by existing code):

<?xml version="1.0" encoding="UTF-8"?>
<opf:package xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf" version="2.0" unique-identifier="uuid">
  <opf:metadata>
    <dc:title>Mylyn Docs Test EPUB</dc:title>
    <dc:creator opf:role="aut" opf:file-as="Resheim, Torkild U.">Torkild U. Resheim</dc:creator>
    <dc:subject>Testing</dc:subject>
    <dc:contributor opf:role="red">Eclipse Committers and Contributors</dc:contributor>
    <dc:date opf:event="creation">2011-08-24</dc:date>
    <dc:format>application/epub+zip</dc:format>
    <dc:identifier id="uuid" opf:scheme="UUID">f47799a9-3d87-41ff-a7ac-5df16632e7be</dc:identifier>
    <dc:source>Eclipse</dc:source>
    <dc:language>en</dc:language>
  </opf:metadata>
  <opf:manifest>
    <opf:item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml"/>
    <opf:item id="plain-page" href="plain-page.xhtml" media-type="application/xhtml+xml"/>
  </opf:manifest>
  <opf:spine toc="ncx">
    <opf:itemref idref="plain-page"/>
  </opf:spine>
  <opf:guide/>
</opf:package>

Now, the problem arises when I want to load the same file. It appears that the loading mechanism figures out how to start as I do get an instance of OPFPackage which represents opf:package. However the parser barfs at "unique-identifier" with the message "org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Feature 'unique-identifier' not found". I cannot see why the ExtendedMetaData for the package are not applied.

I would be grateful for any help resolving this.

Re: Problem loading a resource with renamed feature [message #718573 is a reply to message #718441]

Wed, 24 August 2011 13:11

Eclipse User

Torkild,

Comments below.

On 24/08/2011 3:41 AM, Torkild U. Resheim wrote:
> Hi,
> I'm working on an EMF-based data model which is serialized to XML.
> This file must follow the OPF specification which means that certain
> features must be renamed. This is solved using ExtendedMetaData in the
> ECore model. as such:
>
> <eStructuralFeatures xsi:type="ecore:EAttribute"
> name="uniqueIdentifier" lowerBound="1"
> eType="ecore:EDataType
> http://www.eclipse.org/emf/2002/Ecore#//EString">
> <eAnnotations
> source="http:///org/eclipse/emf/ecore/util/ExtendedMetaData">
> <details key="name" value="unique-identifier"/>
> </eAnnotations>
> </eStructuralFeatures>
>
>
> An example result file looks like this (generated by existing code):
>
> <?xml version="1.0" encoding="UTF-8"?>
> <opf:package xmlns:dc="http://purl.org/dc/elements/1.1/"
> xmlns:opf="http://www.idpf.org/2007/opf" version="2.0"
> unique-identifier="uuid">
> <opf:metadata>
> <dc:title>Mylyn Docs Test EPUB</dc:title>
> <dc:creator opf:role="aut" opf:file-as="Resheim, Torkild U.">Torkild
> U. Resheim</dc:creator>
> <dc:subject>Testing</dc:subject>
> <dc:contributor opf:role="red">Eclipse Committers and
> Contributors</dc:contributor>
> <dc:date opf:event="creation">2011-08-24</dc:date>
> <dc:format>application/epub+zip</dc:format>
> <dc:identifier id="uuid"
> opf:scheme="UUID">f47799a9-3d87-41ff-a7ac-5df16632e7be</dc:identifier>
> <dc:source>Eclipse</dc:source>
> <dc:language>en</dc:language>
> </opf:metadata>
> <opf:manifest>
> <opf:item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml"/>
> <opf:item id="plain-page" href="plain-page.xhtml"
> media-type="application/xhtml+xml"/>
> </opf:manifest>
> <opf:spine toc="ncx">
> <opf:itemref idref="plain-page"/>
> </opf:spine>
> <opf:guide/>
> </opf:package>
>
>
> Now, the problem arises when I want to load the same file. It appears
> that the loading mechanism figures out how to start as I do get an
> instance of OPFPackage which represents opf:package. However the
> parser barfs at "unique-identifier" with the message
> "org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Feature
> 'unique-identifier' not found". I cannot see why the ExtendedMetaData
> for the package are not applied.
What load options are you adding to your resource in your resource
factory? (They should look like the ones generated for the Library.xsd
tutorial example.)
>
> I would be grateful for any help resolving this.

Re: Problem loading a resource with renamed feature [message #718711 is a reply to message #718573]

Thu, 25 August 2011 02:35

Eclipse User

Thanks Ed,

The load options are as follows:

loadOptions.put(XMLResource.OPTION_EXTENDED_META_DATA, Boolean.TRUE);
loadOptions.put(XMLResource.OPTION_USE_ENCODED_ATTRIBUTE_STYLE, Boolean.TRUE);

I suspect that part of the problem is that I'm running this code standalone, that is not on top of the Eclipse platform. The loading code looks like this:

ResourceSet resourceSet = new ResourceSetImpl();
URI fileURI = URI.createFileURI(opfFile.getAbsolutePath());
Resource resource = resourceSet.createResource(fileURI);
resource.load(null);

Re: Problem loading a resource with renamed feature [message #718725 is a reply to message #718711]

Thu, 25 August 2011 03:00

Eclipse User

Torkild,

You've used the debugger to verify that it's really using those options?

On 24/08/2011 11:35 PM, Torkild U. Resheim wrote:
> Thanks Ed,
>
> The load options are as follows:
>
> loadOptions.put(XMLResource.OPTION_EXTENDED_META_DATA, Boolean.TRUE);
> loadOptions.put(XMLResource.OPTION_USE_ENCODED_ATTRIBUTE_STYLE,
> Boolean.TRUE);
>
>
> I suspect that part of the problem is that I'm running this code
> standalone, that is not on top of the Eclipse platform. The loading
> code looks like this:
>
> ResourceSet resourceSet = new ResourceSetImpl();
> URI fileURI = URI.createFileURI(opfFile.getAbsolutePath());
> Resource resource = resourceSet.createResource(fileURI);
> resource.load(null);
>

Re: Problem loading a resource with renamed feature [message #718782 is a reply to message #718725]

Thu, 25 August 2011 06:33

Eclipse User

Hi Ed,

Yes. defaultLoadOptions contain {USE_ENCODED_ATTRIBUTE_STYLE=true, EXTENDED_META_DATA=true} and the root of the Resource contents is a org.eclipse.mylyn.docs.epub.opf.impl.PackageImpl as expected.

I am able to load the XML file when not using extended metadata.

[Updated on: Thu, 25 August 2011 09:48] by Moderator

Re: Problem loading a resource with renamed feature [message #718906 is a reply to message #718782]

Thu, 25 August 2011 11:17

Eclipse User

Torkild,

You've set a breakpoint where the exception is thrown and trace through
the logic with the debugger that gets you to that point? The problem
might be as simple as the fact that you've not included a
kind='attribute' annotation. Try that or perhaps
OPTION_LAX_FEATURE_PROCESSING will be another thing to try.

On 25/08/2011 3:33 AM, Torkild U. Resheim wrote:
> Hi Ed,
>
> Yes. defaultLoadOptions contain {USE_ENCODED_ATTRIBUTE_STYLE=true,
> EXTENDED_META_DATA=true} and the root of the Resource contents is a
> org.eclipse.mylyn.docs.epub.opf.impl.PackageImpl as expected.

Re: Problem loading a resource with renamed feature [message #718987 is a reply to message #718906]

Thu, 25 August 2011 13:33

Eclipse User

Ed,

Yes, that was what I did. And you were also right about the solution. Setting OPTION_LAX_FEATURE_PROCESSING did the trick. Thanks a lot!

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