refactored code (class method -> interface default method)

Author: hhund

src/main/java/dev/dsf/fhir/validator/implementation_guide/ValidationPackageManager.java

@@ -26,7 +26,10 @@ default ValidationPackageWithDepedencies downloadPackageWithDependencies(String
 	 * @param identifier
 	 * @return validation package with dependencies
 	 */
-	ValidationPackageWithDepedencies downloadPackageWithDependencies(ValidationPackageIdentifier identifier);
+	default ValidationPackageWithDepedencies downloadPackageWithDependencies(ValidationPackageIdentifier identifier)
+	{
+		return downloadPackagesWithDependencies(identifier).get(0);
+	}
 
 	/**
 	 * Downloads the given FHIR packages and all its dependencies.

src/main/java/dev/dsf/fhir/validator/implementation_guide/ValidationPackageManagerImpl.java

@@ -82,17 +82,6 @@ public List<ValidationPackageWithDepedencies> downloadPackagesWithDependencies(
 		return packages;
 	}
 
-	@Override
-	public ValidationPackageWithDepedencies downloadPackageWithDependencies(ValidationPackageIdentifier identifier)
-	{
-		Objects.requireNonNull(identifier, "identifier");
-
-		Map<ValidationPackageIdentifier, ValidationPackage> packagesByNameAndVersion = new HashMap<>();
-		downloadPackageWithDependencies(identifier, packagesByNameAndVersion, new HashMap<>());
-
-		return ValidationPackageWithDepedencies.from(packagesByNameAndVersion, identifier);
-	}
-
 	private void downloadPackageWithDependencies(ValidationPackageIdentifier identifier,
 			Map<ValidationPackageIdentifier, ValidationPackage> packagesByNameAndVersion,
 			Map<ValidationPackageIdentifier, ValidationPackage> allPackagesByNameAndVersion)