operation.setOperator(Operator.ADD);
AdExtensionOverrideOperation[] operations = new AdExtensionOverrideOperation[] {operation};
// Add ad extension override.
AdExtensionOverrideReturnValue result = adExtensionOverrideService.mutate(operations);
// Display ad extension overrides.
for (AdExtensionOverride adExtensionOverrideResult : result.getValue()) {
System.out.println("Location ad extension override with ad id \""
+ adExtensionOverrideResult.getAdId() + "\" and ad extension id \""