/// <summary>
/// Creates an instance of this exception.
/// </summary>
/// <param name="context">The context in which the instance was requested.</param>
/// <param name="name">The name of the instance that was requested.</param>
/// <param name="instanceProvider">The instance provider, which was unable to provide an instance of the specified type.</param>
/// <param name="reason"></param>
internal IncompatibleInstanceTypeException(IContext context, RIName name, IInstanceProvider instanceProvider, string reason)
: base($"The instance by the name '{name}' cannot be instantiated. {reason}")
{
Context = context;
Name = name;
InstanceProvider = instanceProvider;
}
/// <summary>
/// Retrieves the instance provider that is registered by the specified name. If no such instance provider is found then an
/// <see cref="NoSuchInstanceProviderException"/> is thrown.
/// </summary>
/// <param name="name">The name of the instance provider that is retrieved.</param>
/// <returns>The found sinstance provider.</returns>
public IInstanceProvider GetInstanceProvider(RIName name)
{
if (!_instanceProviderDictionary.ContainsKey(name))
{
throw new NoSuchInstanceProviderException(name);
}
return(_instanceProviderDictionary[name]);
}
/// <summary>
/// Registers an instance provider in the context by the specified name. If an instance provider by the same name already exists,
/// then a <see cref="DuplicateInstanceNameException"/> is thrown.
/// </summary>
/// <param name="name">The name by which the instance provider will be registered in the context.</param>
/// <param name="instanceProvider">The instance provider that is registered.</param>
public void AddNamedInstanceProvider(RIName name, IInstanceProvider instanceProvider)
{
if (_instanceProviderDictionary.ContainsKey(name))
{
throw new DuplicateInstanceNameException(name);
}
_instanceProviderDictionary[name] = instanceProvider;
}
/// <summary>
/// Looks up all registered instance providers for one registered by the specified name. When found the instance provider is
/// requested to provide its instance, which hereafter is returned.
/// If no such instance provider is found, then an <see cref="InstanceNotFoundException"/> is thrown.
/// </summary>
/// <param name="name">The name of the instance provider to look up.</param>
/// <returns>The instance returned by the found instance provider.</returns>
public object GetInstance(RIName name)
{
IInstanceProvider instanceProvider;
if (!_instanceProviderDictionary.TryGetValue(name, out instanceProvider))
{
throw new InstanceNotFoundException(this, name);
}
return(instanceProvider.GetInstance());
}
/// <summary>
/// Looks up all registered instance providers for one registered by the specified name. When found the instance provider is
/// requested to provide its instance. Hereafter the method verifies whether the provided instance is a descendant of the specified
/// type (checkType). If this is the case, then the instance is returned.
/// If no such instance provider is found, then an <see cref= "InstanceNotFoundException"/> is thrown.
/// If the instance was not a descendant of the specified type, then an <see cref="IncompatibleInstanceTypeException"/> is thrown.
/// </summary>
/// <param name="name">The name of the instance provider to look up.</param>
/// <param name="checkType">The type against which the type of the provided instance is tested.</param>
/// <returns>The provided instance.</returns>
public object GetInstance(RIName name, Type checkType)
{
IInstanceProvider instanceProvider;
if (!_instanceProviderDictionary.TryGetValue(name, out instanceProvider))
{
throw new InstanceNotFoundException(this, name);
}
var definedInstanceType = instanceProvider.DefinedType;
if (!checkType.IsAssignableFrom(definedInstanceType))
{
throw new IncompatibleInstanceTypeException(this, name, instanceProvider, $"The type {definedInstanceType.FullName} does not implement or inherit {checkType.FullName}.");
}
return(instanceProvider.GetInstance());
}
/// <summary>
/// Creates an instance of the reference instance provider.
/// </summary>
/// <param name="reference">The name by which the referenced instance provider is known.</param>
/// <param name="context">The context in which the referenced instance provider is searched.</param>
public ReferenceProvider(string reference, IContext context)
{
Reference = reference;
_context = context;
}
/// <summary>
/// Create an instance of this exception.
/// </summary>
/// <param name="context">The context in which the instance was requested.</param>
/// <param name="instanceName">The name of the instance that was requested.</param>
internal InstanceNotFoundException(IContext context, RIName instanceName) : base($"No instance found in context by the name '{instanceName}'.")
{
Context = context;
InstanceName = instanceName;
}
/// <summary>
/// Creates an instance of this exception.
/// </summary>
/// <param name="name">The name that is duplicated.</param>
public DuplicateInstanceNameException(RIName name)
: base($"An instance by the name '{name}' is already contained in the context.")
{
Name = name;
}
/// <summary>
/// Looks up all registered instance providers for one registered by the specified name. When found the instance provider is
/// requested to provide its instance. Hereafter the method verifies whether the provided instance is a descendant of the specified
/// type (T). If this is the case, then the instance is casted to the specified type and then returned.
/// If no such instance provider is found, then an <see cref= "InstanceNotFoundException"/> is thrown.
/// If the instance was not a descendant of the specified type, then an <see cref="IncompatibleInstanceTypeException"/> is thrown.
/// </summary>
/// <typeparam name="T">The type by which the instance is checked and casted before returned.</typeparam>
/// <param name="instanceName">The name by which the instance provider is registered.</param>
/// <returns>The provided instance.</returns>
public T GetInstance <T>(RIName instanceName)
{
return((T)GetInstance(instanceName, typeof(T)));
}
/// <summary>
/// Creates an instance of this exception.
/// </summary>
/// <param name="name">The name by which no instance provider could be found.</param>
internal NoSuchInstanceProviderException(RIName name)
: base($"No instance provider found by the name '{name}'.")
{
Name = name;
}
