[jira] [Resolved] (CMIS-849) Rendition.GetContentstream always returns null for QueryResults

["Florian Müller (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CMIS-849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Florian Müller resolved CMIS-849.
---------------------------------
    Resolution: Won't Fix

> Rendition.GetContentstream always returns null for QueryResults
> ---------------------------------------------------------------
>
>                 Key: CMIS-849
>                 URL: https://issues.apache.org/jira/browse/CMIS-849
>             Project: Chemistry
>          Issue Type: Improvement
>          Components: dotcmis
>    Affects Versions: DotCMIS 0.6
>         Environment: DotCMIS 0.6 on .NET 3.5 / Windows 7 x64
> Alfresco 5.0.a on Ubuntu 12.0.4 LTS
>            Reporter: Pascal O.
>            Assignee: Florian Müller
>            Priority: Minor
>         Attachments: client-objects.diff
>
>
> How to reproduce:
> {code}
> var ctx = session.CreateOperationContext();
> ctx.RenditionFilterString = "cmis:thumbnail";
> // Assumption: the returned document has a thumbnail rendition, edit query to match situation
> var result = session.Query("select * from cmis:document", false, ctx).getPage(1).FirstOrDefault();
> var contentStream = result.Renditions[0].GetContentStream()
> {code}
> Expected: contentStream is an instance of a class that implements IContentStream
> Found: null
> ----
> Details: 
> The implementation of DotCMIS.Client.Impl.QueryResult.QueryResult constructor creates all renditions with an id set to "null". This has probably been done because cmis:objectId might not have been selected by the query:
> {code:title=client-object.cs:1581}
> Renditions.Add(of.ConvertRendition(null, rd));
> {code}
> Looking at the implementation of DotCMIS.Client.Impl.Rendition.GetContentStream() we can see, that a null ID always leads to a null content stream. Thus, a query result will never by able to get the content stream of the rendition:
> {code:title=client-object.cs:1513}
>         public IContentStream GetContentStream()
>         {
>             if (objectId == null || StreamId == null)
>             {
>                 return null;
>             }
> {code}
> Instead you will have to call session.getContentStream and select and input values appropriately by hand, which I find is not very comfortable.
> I attached a patch that makes this work. Anyway this means, that the "query author" needs to remember, that cmis:objectId must be selected by the query, otherwise he still gets null - maybe this is the main reason why you chose to always go with null.



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