/**
* Deletes a given trait from an existing entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @param traitNameToBeDeleted name of the trait
* @throws RepositoryException
*/
@Override
@GraphTransaction
public void deleteTrait(String guid, String traitNameToBeDeleted)
throws TraitNotFoundException, EntityNotFoundException, RepositoryException {
LOG.debug("Deleting trait={} from entity={}", traitNameToBeDeleted, guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
List<String> traitNames = GraphHelper.getTraitNames(instanceVertex);
if (!traitNames.contains(traitNameToBeDeleted)) {
throw new TraitNotFoundException(
"Could not find trait="
+ traitNameToBeDeleted
+ " in the repository for entity: "
+ guid);
}
try {
final String entityTypeName = GraphHelper.getTypeName(instanceVertex);
String relationshipLabel = GraphHelper.getTraitLabel(entityTypeName, traitNameToBeDeleted);
Edge edge = GraphHelper.getEdgeForLabel(instanceVertex, relationshipLabel);
deleteHandler.deleteEdgeReference(edge, DataTypes.TypeCategory.TRAIT, false, true);
// update the traits in entity once trait removal is successful
traitNames.remove(traitNameToBeDeleted);
updateTraits(instanceVertex, traitNames);
} catch (Exception e) {
throw new RepositoryException(e);
}
}
/**
* Gets the list of trait names for a given entity represented by a guid.
*
* @param guid globally unique identifier for the entity
* @return a list of trait names for the given entity guid
* @throws RepositoryException
*/
@Override
@GraphTransaction
public List<String> getTraitNames(String guid) throws AtlasException {
LOG.debug("Retrieving trait names for entity={}", guid);
Vertex instanceVertex = graphHelper.getVertexForGUID(guid);
return GraphHelper.getTraitNames(instanceVertex);
}
/**
* Delete all traits from the specified vertex.
*
* @param instanceVertex
* @throws AtlasException
*/
private void deleteAllTraits(Vertex instanceVertex) throws AtlasException {
List<String> traitNames = GraphHelper.getTraitNames(instanceVertex);
LOG.debug("Deleting traits {} for {}", traitNames, string(instanceVertex));
String typeName = GraphHelper.getTypeName(instanceVertex);
for (String traitNameToBeDeleted : traitNames) {
String relationshipLabel = GraphHelper.getTraitLabel(typeName, traitNameToBeDeleted);
deleteEdgeReference(instanceVertex, relationshipLabel, DataTypes.TypeCategory.TRAIT, false);
}
}
