protected virtual object LocateFromChildContainer(IInjectionContextValueProvider valueProvider,
IExportLocatorScope scope,
StaticInjectionContext staticContext,
Type type,
object key,
IInjectionContext context,
object defaultValue,
bool useDefault,
bool isRequired)
{
var value = valueProvider.GetValueFromInjectionContext(scope, type, key, context, false);
if (value != null)
{
return(value);
}
if (scope.TryLocate(type, out value, context, withKey: key))
{
return(value);
}
if (useDefault)
{
return(defaultValue);
}
if (isRequired)
{
throw new LocateException(staticContext);
}
return(null);
}
private static string CreateMessage(StaticInjectionContext context, string message = null)
{
var infoStack = new List <InjectionTargetInfo>(context.InjectionStack.Reverse());
var builder = new StringBuilder();
builder.AppendLine(message ?? $"Could not locate Type {context.ActivationType}");
if (infoStack.Count > 40)
{
for (var i = 0; i < 20; i++)
{
CreateMessageForTargetInfo(builder, infoStack[i], i + 1);
}
builder.AppendLine();
builder.AppendLine($"Dropped {infoStack.Count - 40} entries");
builder.AppendLine();
for (var i = infoStack.Count - 20; i < infoStack.Count; i++)
{
CreateMessageForTargetInfo(builder, infoStack[i], i + 1);
}
}
else
{
for (var i = 0; i < infoStack.Count; i++)
{
CreateMessageForTargetInfo(builder, infoStack[i], i + 1);
}
}
return(builder.ToString());
}
/// <summary>
/// Find decorators for a given type
/// </summary>
/// <param name="scope"></param>
/// <param name="request"></param>
/// <param name="type"></param>
/// <param name="strategy"></param>
/// <returns></returns>
protected virtual List <ICompiledDecoratorStrategy> FindDecoratorsForType(IInjectionScope scope, IActivationExpressionRequest request, Type type, ICompiledExportStrategy strategy)
{
List <ICompiledDecoratorStrategy> decorators = new List <ICompiledDecoratorStrategy>();
StaticInjectionContext staticInjectionContext = null;
var collection =
scope.DecoratorCollectionContainer.GetActivationStrategyCollection(type);
if (collection != null)
{
foreach (var decorator in collection.GetStrategies())
{
if (decorator.HasConditions)
{
if (staticInjectionContext == null)
{
staticInjectionContext = request.GetStaticInjectionContext();
}
if (!decorator.Conditions.All(
condition => condition.MeetsCondition(strategy, staticInjectionContext)))
{
continue;
}
}
decorators.Add(decorator);
}
}
if (type.IsConstructedGenericType)
{
var generic = type.GetGenericTypeDefinition();
collection = scope.DecoratorCollectionContainer.GetActivationStrategyCollection(generic);
if (collection != null)
{
foreach (var decorator in collection.GetStrategies())
{
if (decorator.HasConditions)
{
if (staticInjectionContext == null)
{
staticInjectionContext = request.GetStaticInjectionContext();
}
if (!decorator.Conditions.All(
condition => condition.MeetsCondition(strategy, staticInjectionContext)))
{
continue;
}
}
decorators.Add(decorator);
}
}
}
return(decorators);
}
/// <summary>
/// Test if being injected into a specific type
/// </summary>
/// <param name="strategy">strategy to test</param>
/// <param name="staticInjectionContext">static injection context</param>
/// <returns></returns>
public bool MeetsCondition(IActivationStrategy strategy, StaticInjectionContext staticInjectionContext)
{
var targetInfo =
staticInjectionContext.InjectionStack.FirstOrDefault(
info => info.RequestingStrategy?.StrategyType == ActivationStrategyType.ExportStrategy);
return(targetInfo?.InjectionType != null && _typeTest(targetInfo.InjectionType));
}
/// <summary>
/// Check value for null
/// </summary>
/// <typeparam name="T">type of value</typeparam>
/// <param name="context">static context</param>
/// <param name="value">value to check</param>
/// <returns>non null value</returns>
public static T CheckForNull <T>(StaticInjectionContext context, T value)
{
if (value == null)
{
throw new NullValueProvidedException(context);
}
return(value);
}
public virtual object PostBuildUp(object value, StaticInjectionContext staticContext, IExportLocatorScope scope,
IInjectionContext injectionContext)
{
var timer = (Stopwatch)injectionContext.GetExtraData(staticContext.TargetInfo.UniqueId);
timer.Stop();
return(value);
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="context">static context required</param>
/// <param name="message">message, this is not required</param>
public LocateException(StaticInjectionContext context, string message = null) : base(CreateMessage(context, message))
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
Context = context;
}
/// <summary>
///
/// </summary>
/// <param name="childScope"></param>
/// <param name="disposalScope"></param>
/// <param name="name"></param>
/// <param name="extraData"></param>
/// <param name="consider"></param>
/// <param name="allowNull"></param>
/// <returns></returns>
object IInjectionScope.LocateByNameFromChildScope(IExportLocatorScope childScope, IDisposalScope disposalScope,
string name,
object extraData, ActivationStrategyFilter consider, bool allowNull)
{
var collection = StrategyCollectionContainer.GetActivationStrategyCollectionByName(name);
ICompiledExportStrategy strategy = null;
if (collection != null)
{
if (consider != null)
{
var context = new StaticInjectionContext(typeof(object));
strategy =
collection.GetStrategies()
.FirstOrDefault(
s => (!s.HasConditions || s.Conditions.All(con => con.MeetsCondition(s, context))) && consider(s));
}
else
{
strategy = collection.GetPrimary();
if (strategy == null)
{
var context = new StaticInjectionContext(typeof(object));
strategy = collection.GetStrategies()
.FirstOrDefault(
s => !s.HasConditions || s.Conditions.All(con => con.MeetsCondition(s, context)));
}
}
}
if (strategy != null)
{
var strategyDelegate =
strategy.GetActivationStrategyDelegate(this, InternalFieldStorage.ActivationStrategyCompiler, typeof(object));
return(strategyDelegate(childScope, disposalScope, CreateContext(extraData)));
}
if (Parent != null)
{
return(((IInjectionScope)Parent).LocateByNameFromChildScope(childScope, disposalScope, name, extraData,
consider, allowNull));
}
if (!allowNull)
{
throw new LocateException(new StaticInjectionContext(typeof(object)));
}
return(null);
}
public virtual object PreBuildUp(StaticInjectionContext staticContext, IExportLocatorScope scope,
IInjectionContext injectionContext)
{
var timer = new Stopwatch();
injectionContext.SetExtraData(staticContext.TargetInfo.UniqueId, timer);
timer.Start();
return(null);
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="factories"></param>
/// <param name="name"></param>
/// <param name="attributes"></param>
/// <param name="defaultValue"></param>
/// <param name="staticInjectionContext"></param>
public BindingSourceHelper(IReadOnlyList <IValueProviderFactory> factories,
string name,
IEnumerable <object> attributes,
object defaultValue,
StaticInjectionContext staticInjectionContext)
{
_factories = factories;
_name = name;
_defaultValue = defaultValue;
_staticInjectionContext = staticInjectionContext;
_binding = BindingInfo.GetBindingInfo(attributes);
}
/// <summary>
/// Execute delegate by injecting parameters then executing
/// </summary>
/// <param name="scope"></param>
/// <param name="context"></param>
/// <param name="injectionContext"></param>
/// <param name="delegate"></param>
/// <returns></returns>
public static object InjectAndExecuteDelegate(IExportLocatorScope scope, StaticInjectionContext context,
IInjectionContext injectionContext, Delegate @delegate)
{
var executeFunc = _executeDelegateWithInjections.GetValueOrDefault(@delegate.GetType());
if (executeFunc == null)
{
executeFunc = CreateExecuteDelegate(@delegate);
_executeDelegateWithInjections = _executeDelegateWithInjections.Add(@delegate.GetType(), executeFunc);
}
return(executeFunc(scope, context, injectionContext, @delegate));
}
/// <summary>
/// Test if strategy meets condition
/// </summary>
/// <param name="strategy">strategy to test</param>
/// <param name="staticInjectionContext">static injection context</param>
/// <returns>meets condition</returns>
public bool MeetsCondition(IActivationStrategy strategy, StaticInjectionContext staticInjectionContext)
{
var targetInfo = staticInjectionContext.TargetInfo;
if (targetInfo != null)
{
foreach (var attribute in targetInfo.InjectionTypeAttributes)
{
if (attribute.GetType() == _attributeType && (_filter == null || _filter(attribute)))
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Check for null and then add to disposal scope
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="disposalScope"></param>
/// <param name="context"></param>
/// <param name="value"></param>
/// <returns></returns>
public static T CheckForNullAndAddToDisposalScope <T>(IDisposalScope disposalScope,
StaticInjectionContext context, T value)
{
if (value == null)
{
throw new NullValueProvidedException(context);
}
var disposable = value as IDisposable;
if (disposable != null)
{
disposalScope.AddDisposable(disposable);
}
return(value);
}
/// <summary>
/// Test if strategy meets condition
/// </summary>
/// <param name="strategy">strategy to test</param>
/// <param name="staticInjectionContext">static injection context</param>
/// <returns>meets condition</returns>
public bool MeetsCondition(IActivationStrategy strategy, StaticInjectionContext staticInjectionContext)
{
var targetInfo = staticInjectionContext.InjectionStack.FirstOrDefault(
info => info.RequestingStrategy?.StrategyType == ActivationStrategyType.ExportStrategy);
if (targetInfo != null)
{
foreach (var attribute in targetInfo.InjectionTypeAttributes)
{
if (attribute.GetType() == _attributeType && (_filter == null || _filter(attribute)))
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Test if strategy meets condition
/// </summary>
/// <param name="strategy">strategy to test</param>
/// <param name="staticInjectionContext">static injection context</param>
/// <returns>meets condition</returns>
public bool MeetsCondition(IActivationStrategy strategy, StaticInjectionContext staticInjectionContext)
{
var targetInfo = staticInjectionContext.TargetInfo;
if (targetInfo != null)
{
foreach (var attribute in targetInfo.InjectionMemberAttributes)
{
var attrT = attribute as TAttribute;
if (attrT != null && (_filter == null || _filter(attrT)))
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Get value from scope
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="scope"></param>
/// <param name="creationDelegate"></param>
/// <param name="uniqueId"></param>
/// <param name="scopeName"></param>
/// <param name="context"></param>
/// <param name="staticContext"></param>
/// <param name="shareContext"></param>
/// <returns></returns>
public static T GetValueFromScope <T>(IExportLocatorScope scope, ActivationStrategyDelegate creationDelegate,
string uniqueId,
string scopeName,
bool shareContext,
IInjectionContext context,
StaticInjectionContext staticContext)
{
while (scope != null)
{
if (scope.ScopeName == scopeName)
{
break;
}
scope = scope.Parent;
}
if (scope == null)
{
throw new NamedScopeLocateException(scopeName, staticContext);
}
var value = scope.GetExtraData(uniqueId);
if (value != null)
{
return((T)value);
}
lock (scope.GetLockObject(uniqueId))
{
value = scope.GetExtraData(uniqueId);
if (value == null)
{
value = creationDelegate(scope, scope, shareContext ? context : null);
scope.SetExtraData(uniqueId, value);
}
}
return((T)value);
}
/// <summary>
/// Test if strategy meets condition at configuration time
/// </summary>
/// <param name="strategy">strategy to test</param>
/// <param name="staticInjectionContext">static injection context</param>
/// <returns>meets condition</returns>
public bool MeetsCondition(IActivationStrategy strategy, StaticInjectionContext staticInjectionContext)
{
if (_decoratedType.GetTypeInfo().IsGenericTypeDefinition)
{
var current = strategy.ActivationType;
while (current != null && current != typeof(object))
{
if (current.IsConstructedGenericType && current.GetGenericTypeDefinition() == _decoratedType)
{
return(true);
}
current = current.GetTypeInfo().BaseType;
}
return(false);
}
return(strategy.ActivationType.IsAssignableFrom(_decoratedType));
}
private string GetAncestorRequestId(StaticInjectionContext context)
{
var typeInfo = _ancestorType.GetTypeInfo();
var injectionInfoTarget = context.InjectionStack.FirstOrDefault(target =>
{
var injectionInfo = target.InjectionType?.GetTypeInfo();
if (injectionInfo != null && typeInfo.IsAssignableFrom(injectionInfo))
{
return(true);
}
return(false);
});
if (injectionInfoTarget == null)
{
throw new LocateException(context, $"Could not find ancestor type {_ancestorType.Name}");
}
return(injectionInfoTarget.UniqueId);
}
/// <summary>
/// Get a value dynamically
/// </summary>
/// <typeparam name="T">value to get</typeparam>
/// <param name="scope">scope</param>
/// <param name="disposalScope">disposal scope to use</param>
/// <param name="staticInjectionContext">static injection context </param>
/// <param name="context">context for call</param>
/// <param name="key"></param>
/// <param name="isRequired"></param>
/// <param name="hasDefault"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static T GetDynamicValue <T>(IExportLocatorScope scope, IDisposalScope disposalScope, StaticInjectionContext staticInjectionContext,
IInjectionContext context, object key, bool isRequired, bool hasDefault, object defaultValue)
{
var injectionScope = scope.GetInjectionScope();
var value = injectionScope.LocateFromChildScope(scope, disposalScope, typeof(T), context, null, key, true, true);
if (value != null)
{
return((T)value);
}
if (hasDefault)
{
return((T)defaultValue);
}
if (isRequired)
{
throw new LocateException(staticInjectionContext, $"Could not locate dynamic value for type {typeof(T).FullName}");
}
return(default(T));
}
/// <summary>
/// Get data from injection context
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="locator"></param>
/// <param name="staticContext"></param>
/// <param name="key"></param>
/// <param name="dataProvider"></param>
/// <param name="defaultValue"></param>
/// <param name="useDefault"></param>
/// <param name="isRequired"></param>
/// <returns></returns>
public virtual T GetValueFromInjectionContext <T>(IExportLocatorScope locator,
StaticInjectionContext staticContext,
object key,
IInjectionContext dataProvider,
object defaultValue,
bool useDefault,
bool isRequired)
{
object value = null;
if (dataProvider != null)
{
GetValueFromExtraDataProvider <T>(key, dataProvider, out value);
if (value == null)
{
if (dataProvider.ExtraData is T)
{
value = dataProvider.ExtraData;
}
else
{
var delegateInstance = dataProvider.ExtraData as Delegate;
if (delegateInstance != null && delegateInstance.GetMethodInfo().ReturnType == typeof(T))
{
value = delegateInstance;
}
}
}
}
if (value == null)
{
var currentLocator = locator;
while (currentLocator != null)
{
if (GetValueFromExtraDataProvider <T>(key, currentLocator, out value))
{
break;
}
currentLocator = currentLocator.Parent;
}
}
if (value == null && useDefault)
{
value = defaultValue;
}
if (value != null)
{
if (value is Delegate)
{
value =
ReflectionService.InjectAndExecuteDelegate(locator, staticContext, dataProvider, value as Delegate);
}
if (!(value is T))
{
try
{
value = Convert.ChangeType(value, typeof(T));
}
catch (Exception exp)
{
// to do fix up exception
throw new LocateException(staticContext, exp);
}
}
}
else if (isRequired && !useDefault)
{
throw new LocateException(staticContext);
}
return((T)value);
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="scopeName">scope name</param>
/// <param name="context">static injection context</param>
public NamedScopeLocateException(string scopeName, StaticInjectionContext context) : base(context, $"Could not locate scope with name {scopeName}")
{
ScopeName = scopeName;
}
/// <summary>
/// Default constructor takes context
/// </summary>
/// <param name="context">static injection context</param>
public ImportInjectionScopeException(StaticInjectionContext context) : base(context, ErrorMessage)
{
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="context"></param>
public NullValueProvidedException(StaticInjectionContext context) :
base(context, $"Null value provided from factory for {ReflectionService.GetFriendlyNameForType(context.ActivationType, true)}")
{
}
/// <summary>
/// Gets value from injection context
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="locator"></param>
/// <param name="staticContext"></param>
/// <param name="key"></param>
/// <param name="dataProvider"></param>
/// <param name="defaultValue"></param>
/// <param name="useDefault"></param>
/// <param name="isRequired"></param>
/// <returns></returns>
public static T GetValueFromInjectionContext <T>(
IExportLocatorScope locator,
StaticInjectionContext staticContext,
object key,
IInjectionContext dataProvider,
object defaultValue,
bool useDefault,
bool isRequired)
{
object value = null;
if (dataProvider != null)
{
value = GetValueFromExtraDataProvider <T>(key, dataProvider);
}
if (value == null)
{
var currentLocator = locator;
while (currentLocator != null && value == null)
{
value = GetValueFromExtraDataProvider <T>(key, currentLocator);
currentLocator = currentLocator.Parent;
}
}
if (value == null && useDefault)
{
value = defaultValue;
}
if (value != null)
{
if (value is Delegate)
{
value =
ReflectionService.InjectAndExecuteDelegate(locator, staticContext, dataProvider, value as Delegate);
}
if (!typeof(T).GetTypeInfo().IsAssignableFrom(value.GetType().GetTypeInfo()))
{
try
{
value = Convert.ChangeType(value, typeof(T));
}
catch (Exception exp)
{
// to do fix up exception
throw new LocateException(staticContext, exp);
}
}
}
else if (isRequired && !useDefault)
{
throw new LocateException(staticContext);
}
return((T)value);
}
/// <summary>
/// Test if condition is meet
/// </summary>
/// <param name="strategy">strategy to test</param>
/// <param name="staticInjectionContext">static injection context</param>
/// <returns>true if condition is meet</returns>
public bool MeetsCondition(IActivationStrategy strategy, StaticInjectionContext staticInjectionContext)
{
return(_condition(strategy, staticInjectionContext));
}
/// <summary>
/// Test if being injected into a specific type
/// </summary>
/// <param name="strategy">strategy to test</param>
/// <param name="staticInjectionContext">static injection context</param>
/// <returns></returns>
public bool MeetsCondition(IActivationStrategy strategy, StaticInjectionContext staticInjectionContext)
{
var targetInfo = staticInjectionContext.TargetInfo;
return(targetInfo?.InjectionType != null && _typeTest(targetInfo.InjectionType));
}
/// <summary>
/// Constructor that takes an inner exception
/// </summary>
/// <param name="context">static context</param>
/// <param name="innerException">inner exception</param>
/// <param name="message">message for exception</param>
public LocateException(StaticInjectionContext context, Exception innerException, string message = null) : base(CreateMessage(context, message), innerException)
{
Context = context;
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="context"></param>
public RecursiveLocateException(StaticInjectionContext context) : base(context, "Recursive object graph detected")
{
}
