Olingo v2 - How to write an entity with navigation entities

Question

I use Apache Olingo v2. SAP is the server and I'm in charge of the client-side. I try to write an entity with navigation entities. I explain what I try to say. There is an entity set named HUIDENT, this set contains a navigation property named ToHuContent.

And a HUCONTENT is

I would like to send an HUIDENT with some HUCONTENT but I don't how to do this. I would like a feed like this


  
   secretUrl/HUIDENTSet(Lgnum='IN01',Huident='155000000000001757')
   HUIDENTSet(Lgnum='IN01',Huident='155000000000001757')
   2016-05-26T22:48:07Z
   
   
   
    
 
 
  
    
     IN01
     155000000000001757
     12345
     1543473
     122333
     2016-05-27T00:00:00
     2016-05-26T22:48:00
    
   
  
  
   
    
     IN01
     155000000000001757
     12345
     
     1543473
     2016-05-27T00:00:00
     2016-05-26T22:48:00
    
   
  
 
 
 
 
   
     IN01
     155000000000001757

Using Olingo I've something as

final EntityProviderWriteProperties properties = EntityProviderWriteProperties
                    .serviceRoot(new URI(this.serviceRoot + "/"))
                    .build();

final ODataResponse response = EntityProvider.writeEntry("application/xml", entitySet, new ImmutableMap.Builder()
               .put("Lgnum", "IN01")
               .put("Huident", "1")
               .build(), properties);

And I don't know where I can set the HUCONTENT entities.

Huret Romain · Accepted Answer

Ok, so I find a solution. For me the principle is not well thought out. I explain it. First, add a navigation property to your entity you need to add an Map to the EntityProviderWriteProperties.

final Map> toHuContent = new ImmutableMap.Builder>()
                    .put(, new ImmutableMap.Builder().build())
                .build();

final EntityProviderWriteProperties properties = EntityProviderWriteProperties
                    .serviceRoot(new URI(this.serviceRoot + "/"))
                    .additionalLinks(toHuContent)
                    .build();

Then, you need to give the expanded tree

final ExpandSelectTreeNode node = ExpandSelectTreeNode.entitySet(entitySet).expandedLinks(Lists.newArrayList().build();
final EntityProviderWriteProperties properties = EntityProviderWriteProperties
                    .serviceRoot(new URI(this.serviceRoot + "/"))
                    .additionalLinks(toHuContent)
                    .expandSelectTree(node)
                    .build();

Finally, to populate your navigation properties you need a callback

final EntityProviderWriteProperties properties = EntityProviderWriteProperties
                    .serviceRoot(new URI(this.serviceRoot + "/"))
                    .additionalLinks(toHuContent)
                    .expandSelectTree(node)
                    .callbacks(new ImmutableMap.Builder().put(, new PopulateInlineEntry()).build())
                    .build();

And the callback need to implements OnWriteFeedContent

@Log4j
public class PopulateInlineEntry implements OnWriteFeedContent {

    @Override
    public WriteFeedCallbackResult retrieveFeedResult(final WriteFeedCallbackContext writeFeedCallbackContext) throws ODataApplicationException {
        final EntityProviderWriteProperties currentWriteProperties = writeFeedCallbackContext.getCurrentWriteProperties();

        final WriteFeedCallbackResult result = new WriteFeedCallbackResult();
        result.setInlineProperties(currentWriteProperties);
        result.setFeedData(Lists.>newArrayList(
                new ImmutableMap.Builder()
                        .put("Lgnum", "IN01")
                        .put("Huident", "1")
                        .put("Epc", "1")

                        .build(),
                new ImmutableMap.Builder()
                        .put("Lgnum", "IN01")
                        .put("Huident", "1")
                        .put("Epc", "2")

                        .build()
        ));

        return result;
    }

}

I understand the use of the tree and the callback but not the additional link... I read the code of Olingo libraires and the librairy need a tree, an additionalLinks and a callback.

I hope this answer will useful for someone

Olingo v2 - How to write an entity with navigation entities

Answers (1)

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