public DataNode getDataNode() throws BigDBException {
if (contributions.isEmpty()) return DataNode.NULL;
// FIXME: There's probably a cleaner way to do this instead of
// hard-coding the different types of logical data nodes here.
switch (schemaNode.getNodeType()) {
case CONTAINER:
return LogicalContainerDataNode.fromContributions(
schemaNode, contributions, includeDefaultValues);
case LIST_ELEMENT:
return LogicalListElementDataNode.fromContributions(
schemaNode, contributions, includeDefaultValues);
case LIST:
ListSchemaNode listSchemaNode = (ListSchemaNode) schemaNode;
if (listSchemaNode.isKeyedList()) {
return LogicalKeyedListDataNode.fromContributions(
schemaNode, contributions, includeDefaultValues);
} else {
Set<String> dataSources = schemaNode.getDataSources();
assert dataSources.size() == 1;
String dataSourceName = dataSources.iterator().next();
Contribution contribution = contributions.get(dataSourceName);
return LogicalUnkeyedListDataNode.fromContribution(
schemaNode, contribution, includeDefaultValues);
}
default:
// There currently aren't logical wrappers for the physical
// leaf or leaf list data nodes since they always come from a single
// data source and don't need logical aggregation. Also, default
// value substitution is done in the LogicalDictionaryDataNode.
// When we support mutation operations it might make sense to have
// logical wrappers for leaf and leaf list nodes so that we have
// access to the schema node
throw new BigDBException("Invalid logical data node type");
}
}
