DependencyResolver.cls

DependencyResolver.cls

public class DependencyResolver {
    @TestVisible
    private static Map<Type, Object> cachedDependencies {get; set;}

    static {
        cachedDependencies = new Map<Type, Object>();
    }

    // core methods abstract the core logic
    public static Object getInstance(Type classType) {
        if (cachedDependencies.containsKey(classType)) {
            return cachedDependencies.get(classType);
        }
        return classType.newInstance();
    }

    public static Object getSingleton(Type classType) {
        if (!cachedDependencies.containsKey(classType)) {
            cachedDependencies.put(classType, classType.newInstance());
        }
        return cachedDependencies.get(classType);
    }

    @TestVisible
    private static void mockDependency(Type classType, Object instance) {
        cachedDependencies.put(classType, instance);
    }

    @TestVisible
    private static void mockDependency(StubProviderImpl stubProvider) {
        cachedDependencies.put(stubProvider.mockType, stubProvider.buildMockInstance());
    }
}