/// <summary>
/// Resolves a dependency.
/// </summary>
/// <param name="typeToResolve">The type to be resolved.</param>
/// <param name="typeToCreate">The type to be created, if the type cannot be resolved
/// (and notPresent is set to <see cref="NotPresentBehavior.CreateNew"/>).</param>
/// <param name="id">The ID of the object to be resolved. Pass null for the unnamed object.</param>
/// <param name="notPresent">Flag to describe how to behave if the dependency is not found.</param>
/// <param name="searchMode">Flag to describe whether searches are local only, or local and up.</param>
/// <returns>The dependent object. If the object is not found, and notPresent
/// is set to <see cref="NotPresentBehavior.ReturnNull"/>, will return null.</returns>
public object Resolve(Type typeToResolve, Type typeToCreate, string id, NotPresentBehavior notPresent, SearchMode searchMode)
{
if (typeToResolve == null)
throw new ArgumentNullException("typeToResolve");
if (!Enum.IsDefined(typeof(NotPresentBehavior), notPresent))
throw new ArgumentException(Properties.Resources.InvalidEnumerationValue, "notPresent");
if (typeToCreate == null)
typeToCreate = typeToResolve;
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(typeToResolve, id);
if (context.Locator.Contains(key, searchMode))
return context.Locator.Get(key, searchMode);
switch (notPresent)
{
case NotPresentBehavior.CreateNew:
return context.HeadOfChain.BuildUp(context, typeToCreate, null, key.ID);
case NotPresentBehavior.ReturnNull:
return null;
default:
throw new DependencyMissingException(
string.Format(CultureInfo.CurrentCulture,
Properties.Resources.DependencyMissing, typeToResolve.ToString()));
}
}
public void CanRegisterObjectByTypeAndID()
{
object o = new object();
IReadWriteLocator locator = new Locator();
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(typeof(object), "foo");
locator.Add(key, o);
Assert.IsNotNull(locator.Get(key));
Assert.AreSame(o, locator.Get(key));
}
/// <summary>
/// Overridden so that TypeIDPair can be used as the key in dictionaries.
/// </summary>
public override bool Equals(object obj)
{
DependencyResolutionLocatorKey other = obj as DependencyResolutionLocatorKey;
if (other == null)
{
return(false);
}
return(Equals(type, other.type) && Equals(id, other.id));
}
/// <summary>
/// Maps one type/ID pair to another, using the locator to find the
/// current <see cref="CompositionContainer"/>. The container holds
/// the current set of type mappings.
/// </summary>
/// <param name="locator">The <see cref="IReadableLocator"/> being used in the
/// current BuildUp operation.</param>
/// <param name="incomingTypeIdPair"><see cref="DependencyResolutionLocatorKey"/> that identifies
/// the type of the current BuildUp operation.</param>
/// <returns>The new type to return; returns the original key if no type mapping is defined.</returns>
public DependencyResolutionLocatorKey Map(
IReadableLocator locator, DependencyResolutionLocatorKey incomingTypeIdPair)
{
DependencyResolutionLocatorKey result = incomingTypeIdPair;
CompositionContainer container = GetCompositionContainerFromLocator(locator);
if (container != null)
{
result = new DependencyResolutionLocatorKey(container.GetMappedType(result.Type),
incomingTypeIdPair.ID);
}
return result;
}
/// <summary>
/// Implementation of <see cref="IBuilderStrategy.BuildUp"/>.
/// </summary>
/// <param name="context">The build context.</param>
/// <param name="typeToBuild">The type of the object being built.</param>
/// <param name="existing">The existing instance of the object.</param>
/// <param name="idToBuild">The ID of the object being built.</param>
/// <returns>The built object.</returns>
public override object BuildUp(IBuilderContext context, Type typeToBuild, object existing, string idToBuild)
{
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(typeToBuild, idToBuild);
if (context.Locator != null && context.Locator.Contains(key, SearchMode.Local))
{
TraceBuildUp(context, typeToBuild, idToBuild, "");
return context.Locator.Get(key);
}
return base.BuildUp(context, typeToBuild, existing, idToBuild);
}
/// <summary>
/// Implementation of <see cref="IBuilderStrategy.BuildUp"/>.
/// </summary>
/// <param name="context">The build context.</param>
/// <param name="typeToBuild">The type of the object being built.</param>
/// <param name="existing">The existing instance of the object.</param>
/// <param name="idToBuild">The ID of the object being built.</param>
/// <returns>The built object.</returns>
public override object BuildUp(IBuilderContext context, Type typeToBuild, object existing, string idToBuild)
{
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(typeToBuild, idToBuild);
if (context.Locator != null && context.Locator.Contains(key, SearchMode.Local))
{
TraceBuildUp(context, typeToBuild, idToBuild, "");
return(context.Locator.Get(key));
}
return(base.BuildUp(context, typeToBuild, existing, idToBuild));
}
public override object BuildUp(IBuilderContext context, Type t, object existing, string id)
{
DependencyResolutionLocatorKey incomingTypeIDPair = new DependencyResolutionLocatorKey(t, id);
ITypeMappingPolicy policy = context.Policies.Get<ITypeMappingPolicy>(t, id);
if (policy != null)
{
incomingTypeIDPair = policy.Map(incomingTypeIDPair);
object[] args = new object[] { incomingTypeIDPair.Type, incomingTypeIDPair.ID ?? "(null)" };
base.TraceBuildUp(context, t, id, Resources.TypeMapped, args);
Guard.TypeIsAssignableFromType(t, incomingTypeIDPair.Type, t);
}
return base.BuildUp(context, incomingTypeIDPair.Type, existing, incomingTypeIDPair.ID);
}
/// <summary>
/// Implementation of <see cref="IBuilderStrategy.BuildUp"/>.
/// </summary>
public override object BuildUp(IBuilderContext context, Type t, object existing, string id)
{
DependencyResolutionLocatorKey result = new DependencyResolutionLocatorKey(t, id);
ITypeMappingPolicy policy = context.Policies.Get<ITypeMappingPolicy>(t, id);
if (policy != null)
{
result = policy.Map(result);
TraceBuildUp(context, t, id, Properties.Resources.TypeMapped, result.Type, result.ID ?? "(null)");
Guard.TypeIsAssignableFromType(t, result.Type, t);
}
return base.BuildUp(context, result.Type, existing, result.ID);
}
/// <summary>
/// Implementation of <see cref="IBuilderStrategy.BuildUp"/>.
/// </summary>
public override object BuildUp(IBuilderContext context, Type t, object existing, string id)
{
DependencyResolutionLocatorKey result = new DependencyResolutionLocatorKey(t, id);
ITypeMappingPolicy policy = context.Policies.Get <ITypeMappingPolicy>(t, id);
if (policy != null)
{
result = policy.Map(result);
TraceBuildUp(context, t, id, Properties.Resources.TypeMapped, result.Type, result.ID ?? "(null)");
Guard.TypeIsAssignableFromType(t, result.Type, t);
}
return(base.BuildUp(context, result.Type, existing, result.ID));
}
public void PolicyShouldRequestTypeMappingFromContainer()
{
TestableRootCompositionContainer container = new TestableRootCompositionContainer();
container.RegisterTypeMapping<IFoo, Foo>();
ContainerAwareTypeMappingPolicy policy = new ContainerAwareTypeMappingPolicy();
string requestId = "My mapped object";
DependencyResolutionLocatorKey requestKey =
new DependencyResolutionLocatorKey(typeof (IFoo), requestId);
DependencyResolutionLocatorKey result = policy.Map(container.Locator, requestKey);
Assert.AreEqual(typeof (Foo), result.Type);
Assert.AreEqual(requestId, result.ID);
}
public void PolicyCallsUpToParentContainerToGetMapping()
{
TestableRootCompositionContainer container = new TestableRootCompositionContainer();
container.RegisterTypeMapping<IFoo, Foo>();
CompositionContainer child = container.Containers.AddNew<CompositionContainer>();
ContainerAwareTypeMappingPolicy policy = new ContainerAwareTypeMappingPolicy();
string requestId = "My mapped object";
DependencyResolutionLocatorKey requestKey =
new DependencyResolutionLocatorKey(typeof (IFoo), requestId);
DependencyResolutionLocatorKey result = policy.Map(child.Locator, requestKey);
Assert.AreEqual(typeof (Foo), result.Type);
Assert.AreEqual(requestId, result.ID);
}
/// <summary>
/// Implementation of <see cref="IBuilderStrategy.BuildUp"/>.
/// </summary>
/// <param name="context">The build context.</param>
/// <param name="typeToBuild">The type of the object being built.</param>
/// <param name="existing">The existing instance of the object.</param>
/// <param name="idToBuild">The ID of the object being built.</param>
/// <returns>The built object.</returns>
public override object BuildUp(IBuilderContext context, Type typeToBuild, object existing, string idToBuild)
{
DependencyResolutionLocatorKey key = null;
ILifetimeContainer lifeTime = GetLifetime(context);
if (context.Locator != null)
{
key = new DependencyResolutionLocatorKey(typeToBuild, idToBuild);
if (context.Locator.Contains(key, SearchMode.Local))
{
return context.Locator.Get(key);
}
}
existing = base.BuildUp(context, typeToBuild, existing, idToBuild);
if (context.Locator != null && lifeTime != null && IsSingleton(context, key))
{
context.Locator.Add(key, existing);
lifeTime.Add(existing);
}
return existing;
}
/// <summary>
/// Resolves a dependency.
/// </summary>
/// <param name="typeToResolve">The type to be resolved.</param>
/// <param name="typeToCreate">The type to be created, if the type cannot be resolved
/// (and notPresent is set to <see cref="NotPresentBehavior.CreateNew"/>).</param>
/// <param name="id">The ID of the object to be resolved. Pass null for the unnamed object.</param>
/// <param name="notPresent">Flag to describe how to behave if the dependency is not found.</param>
/// <param name="searchMode">Flag to describe whether searches are local only, or local and up.</param>
/// <returns>The dependent object. If the object is not found, and notPresent
/// is set to <see cref="NotPresentBehavior.ReturnNull"/>, will return null.</returns>
public object Resolve(Type typeToResolve, Type typeToCreate, string id, NotPresentBehavior notPresent, SearchMode searchMode)
{
if (typeToResolve == null)
{
throw new ArgumentNullException("typeToResolve");
}
if (!Enum.IsDefined(typeof(NotPresentBehavior), notPresent))
{
throw new ArgumentException(Properties.Resources.InvalidEnumerationValue, "notPresent");
}
if (typeToCreate == null)
{
typeToCreate = typeToResolve;
}
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(typeToResolve, id);
if (context.Locator.Contains(key, searchMode))
{
return(context.Locator.Get(key, searchMode));
}
switch (notPresent)
{
case NotPresentBehavior.CreateNew:
return(context.HeadOfChain.BuildUp(context, typeToCreate, null, key.ID));
case NotPresentBehavior.ReturnNull:
return(null);
default:
throw new DependencyMissingException(
string.Format(CultureInfo.CurrentCulture,
Properties.Resources.DependencyMissing, typeToResolve.ToString()));
}
}
private static bool IsSingleton(IBuilderContext context, DependencyResolutionLocatorKey key)
{
ISingletonPolicy policy = context.Policies.Get<ISingletonPolicy>(key.Type, key.ID);
return policy != null && policy.IsSingleton;
}
/// <summary>
/// Initializes a new instance of the <see cref="TypeMappingPolicy"/> class using
/// the provided type and ID.
/// </summary>
/// <param name="type">The new type to be returned during Map.</param>
/// <param name="id">The new ID to be returned during Map.</param>
public TypeMappingPolicy(Type type, string id)
{
pair = new DependencyResolutionLocatorKey(type, id);
}
/// <summary>
/// See <see cref="ITypeMappingPolicy.Map"/> for more information.
/// </summary>
public DependencyResolutionLocatorKey Map(DependencyResolutionLocatorKey incomingTypeIDPair)
{
return(pair);
}
public TypeMappingPolicy(Type type, string id)
{
this.pair = new DependencyResolutionLocatorKey(type, id);
}
public DependencyResolutionLocatorKey Map(DependencyResolutionLocatorKey incomingTypeIDPair)
{
return this.pair;
}
public override object GetValue(IBuilderContext context)
{
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(typeof(WorkItem), null);
WorkItem wi = (WorkItem)context.Locator.Get(key);
if (id != null)
return wi.State[id];
foreach (string stateID in wi.State.Keys)
if (type.IsAssignableFrom(wi.State[stateID].GetType()))
return wi.State[stateID];
return null;
}
public override object GetValue(IBuilderContext context)
{
DependencyResolutionLocatorKey key = new DependencyResolutionLocatorKey(typeof(ITraceSourceCatalogService), null);
ITraceSourceCatalogService svc = (ITraceSourceCatalogService)context.Locator.Get(key);
return svc != null ? svc.GetTraceSource(sourceName) : null;
}
