PowerAndBattery

Documentation: PowerAndBatteryModule

Purpose

The PowerAndBatteryModule is a Prism-based modular component responsible for registering the view and view model for the Power & Battery feature within the application’s UI. It enables lazy loading and dependency injection integration for the PowerAndBatteryView and PowerAndBatteryViewModel types via the Unity container. Additionally, it contributes metadata (specifically image and grouping information) to the main UI for visual identification and categorization of this module.

Public Interface

`PowerAndBatteryModule` Class

PowerAndBatteryModule(IUnityContainer unityContainer)
Constructor. Accepts a Unity container via dependency injection and stores it for later use in type registration.
void Initialize()
Registers two interfaces to their concrete implementations as singleton types in the Unity container:
- IPowerAndBatteryView → PowerAndBatteryView
- IPowerAndBatteryViewModel → PowerAndBatteryViewModel
  This method is called both directly during module initialization and indirectly via RegisterTypes.
void OnInitialized(IContainerProvider containerProvider)
Currently empty. No logic is executed during Prism’s OnInitialized pipeline phase.
void RegisterTypes(IContainerRegistry containerRegistry)
Delegates to Initialize() (which uses the injected _unityContainer, not containerRegistry).
⚠️ Note: The containerRegistry parameter is unused; registration occurs on the pre-injected _unityContainer, which may be inconsistent with Prism’s intended IContainerRegistry usage.

`PowerAndBatteryImageAttribute` Class

PowerAndBatteryImageAttribute()
Default constructor. Calls the overloaded constructor with null.
PowerAndBatteryImageAttribute(string s)
Constructor accepting a string (unused in implementation). Loads and caches the assembly image via AssemblyInfo.GetImage(AssemblyNames.PowerAndBattery.ToString()).
override BitmapImage AssemblyImage { get; }
Returns the cached BitmapImage loaded from the assembly resource for the PowerAndBattery module.
override BitmapImage GetAssemblyImage()
Returns the value of AssemblyImage.
override string AssemblyName { get; }
Returns "PowerAndBattery" (via AssemblyNames.PowerAndBattery.ToString()).
override string GetAssemblyName()
Returns the value of AssemblyName.
override string AssemblyGroup { get; }
Returns "Administrative" (via eAssemblyGroups.Administrative.ToString()).
override string GetAssemblyGroup()
Returns the value of AssemblyGroup.
override eAssemblyRegion AssemblyRegion { get; }
Throws NotImplementedException. Always throws; never returns a value.
override eAssemblyRegion GetAssemblyRegion()
Delegates to AssemblyRegion, thus also throws NotImplementedException.
override Type GetAttributeType()
Returns typeof(ImageAttribute).

Invariants

The PowerAndBatteryModule must be loaded after the Unity container is available and before views/view models are resolved.
IPowerAndBatteryView and IPowerAndBatteryViewModel must be registered exactly once per module load (enforced by singleton registration).
AssemblyImage and AssemblyName are immutable after first access (cached in private fields _img, _name, _group).
AssemblyGroup is always "Administrative" (hardcoded).
AssemblyRegion and GetAssemblyRegion() are never functional — they always throw NotImplementedException.

Dependencies

Module Depends On

Unity.IUnityContainer — for type registration.
Prism.Modularity.IModule — base interface for Prism modules.
DTS.Common — specifically:
- AssemblyInfo.GetImage(...)
- AssemblyNames.PowerAndBattery
- eAssemblyGroups.Administrative
System.Windows.Media.Imaging.BitmapImage — for image metadata.
System.ComponentModel.Composition.ExportAttribute — for Prism module discovery.

Module Is Used By

Prism’s module catalog/loader (via [Export(typeof(IModule))] and [Module(...)] attributes).
The main UI layer — via PowerAndBatteryImageAttribute applied at the assembly level (inferred from XML doc comment: “used on the Main screen to display available components”).

Gotchas

RegisterTypes ignores its parameter: The method accepts IContainerRegistry containerRegistry but internally calls Initialize(), which uses the injected _unityContainer. This is inconsistent with Prism’s design (where IContainerRegistry is the expected registration mechanism) and may cause issues if the module is used in a non-Unity Prism environment or if containerRegistry is expected to be used.
AssemblyRegion is non-functional: Both AssemblyRegion and GetAssemblyRegion() throw NotImplementedException. Any UI logic relying on region classification will fail at runtime.
Redundant field assignments: Private fields (_img, _name, _group) are assigned in both the property getter and constructor, but the getter always returns the cached value — the constructor assignment is redundant.
Unused constructor parameter in PowerAndBatteryImageAttribute(string s): The string s parameter is never used.
No validation on image loading: AssemblyInfo.GetImage(...) may throw if the assembly resource is missing or malformed; no error handling is present.

None identified beyond the above.

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