[OLINGO-605] Olingo should support custom types e.g. Geometry by using XmlAdapter from JaxB

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: V2 2.0.3
• Fix Version/s: V2 2.0.10
• Component/s: odata2-jpa
• Labels: GIS custom spatial types
• Assignee: mibo
• Reporter: Manuel Blechschmidt
• Created: 28/Mar/15 12:03
• Updated: 12/Mar/22 16:52
• Resolved: 02/Oct/17 13:36

Description

I am currently developing a software where I save GIS coordinates as part of my entities. I want to send these geometries as a string through OData to a client.

Technically I do the following:

OpenGis -> Hibernate Spatial -> JPA -> Olingo -> JavaScript -> OpenLayers

I already have an XmlAdapter that maps my Geometry to WKT. I want to use this as well for Olingo serialization

I copied the following file in my workspace and extended the convertToEdmSimpleType function:

org.apache.olingo.odata2.jpa.processor.core.access.model.JPATypeConvertor

 public static EdmSimpleTypeKind
      ...
    } else if(jpaType.equals(Geometry.class)) {
    	// "OData - JPA Type Converter: Type [class com.vividsolutions.jts.geom.Geometry] not supported"
    	return EdmSimpleTypeKind.String;
    }

    throw ODataJPAModelException.throwException(ODataJPAModelException.TYPE_NOT_SUPPORTED
        .addContent(jpaType.toString()), null);
  }

This is quick and dirty and it would be nice if there would be a cleaner solution to do so.