/// <summary>
/// Searches for and returns the method that is to be invoked.
/// </summary>
/// <remarks>
/// The return value of this method call will subsequently be returned from the
/// <see cref="Oragon.Spring.Objects.Support.MethodInvoker.GetPreparedMethod()"/>.
/// </remarks>
/// <returns>The method that is to be invoked.</returns>
/// <exception cref="System.MissingMethodException">
/// If no method could be found.
/// </exception>
/// <exception cref="System.ArgumentException">
/// If more than one method was found.
/// </exception>
protected virtual MethodInfo FindTheMethodToInvoke()
{
MethodInfo theMethod = null;
Type targetType = (TargetObject != null) ? TargetObject.GetType() : TargetType;
GenericArgumentsHolder genericInfo = new GenericArgumentsHolder(TargetMethod);
// if we don't have any named arguments, we can try to get the exact method first...
if (NamedArguments.Count == 0)
{
ComposedCriteria searchCriteria = new ComposedCriteria();
searchCriteria.Add(new MethodNameMatchCriteria(genericInfo.GenericMethodName));
searchCriteria.Add(new MethodParametersCountCriteria(ArgumentCount));
searchCriteria.Add(new MethodGenericArgumentsCountCriteria(genericInfo.GetGenericArguments().Length));
searchCriteria.Add(new MethodArgumentsCriteria(Arguments));
MemberInfo[] matchingMethods = targetType.FindMembers(
MemberTypes.Method,
MethodSearchingFlags,
new MemberFilter(new CriteriaMemberFilter().FilterMemberByCriteria),
searchCriteria);
if (matchingMethods != null && matchingMethods.Length == 1)
{
theMethod = matchingMethods[0] as MethodInfo;
}
}
if (theMethod == null)
{
// search for a method with a matching signature...
ComposedCriteria searchCriteria = new ComposedCriteria();
searchCriteria.Add(new MethodNameMatchCriteria(genericInfo.GenericMethodName));
searchCriteria.Add(new MethodParametersCountCriteria(ArgumentCount));
searchCriteria.Add(new MethodGenericArgumentsCountCriteria(genericInfo.GetGenericArguments().Length));
MemberInfo[] matchingMethods = targetType.FindMembers(
MemberTypes.Method,
MethodSearchingFlags,
new MemberFilter(new CriteriaMemberFilter().FilterMemberByCriteria),
searchCriteria);
if (matchingMethods.Length == 0)
{
throw new MissingMethodException(targetType.Name, TargetMethod);
}
if (matchingMethods.Length > 1)
{
throw new ArgumentException(string.Format(
CultureInfo.InvariantCulture,
"Unable to determine which exact method to call; found '{0}' matches.",
matchingMethods.Length));
}
theMethod = matchingMethods[0] as MethodInfo;
}
if (genericInfo.ContainsGenericArguments)
{
string[] unresolvedGenericArgs = genericInfo.GetGenericArguments();
Type[] genericArgs = new Type[unresolvedGenericArgs.Length];
for (int j = 0; j < unresolvedGenericArgs.Length; j++)
{
genericArgs[j] = TypeResolutionUtils.ResolveType(unresolvedGenericArgs[j]);
}
theMethod = theMethod.MakeGenericMethod(genericArgs);
}
return(theMethod);
}
/// <summary>
/// Instantiate an object instance using a named factory method.
/// </summary>
/// <remarks>
/// <p>
/// The method may be static, if the <paramref name="definition"/>
/// parameter specifies a class, rather than a
/// <see cref="Spring.Objects.Factory.IFactoryObject"/> instance, or an
/// instance variable on a factory object itself configured using Dependency
/// Injection.
/// </p>
/// <p>
/// Implementation requires iterating over the static or instance methods
/// with the name specified in the supplied <paramref name="definition"/>
/// (the method may be overloaded) and trying to match with the parameters.
/// We don't have the types attached to constructor args, so trial and error
/// is the only way to go here.
/// </p>
/// </remarks>
/// <param name="name">
/// The name associated with the supplied <paramref name="definition"/>.
/// </param>
/// <param name="definition">
/// The definition describing the instance that is to be instantiated.
/// </param>
/// <param name="arguments">
/// Any arguments to the factory method that is to be invoked.
/// </param>
/// <returns>
/// The result of the factory method invocation (the instance).
/// </returns>
public virtual IObjectWrapper InstantiateUsingFactoryMethod(string name, RootObjectDefinition definition, object[] arguments)
{
ObjectWrapper wrapper = new ObjectWrapper();
Type factoryClass = null;
bool isStatic = true;
ConstructorArgumentValues cargs = definition.ConstructorArgumentValues;
ConstructorArgumentValues resolvedValues = new ConstructorArgumentValues();
int expectedArgCount = 0;
// we don't have arguments passed in programmatically, so we need to resolve the
// arguments specified in the constructor arguments held in the object definition...
if (arguments == null || arguments.Length == 0)
{
expectedArgCount = cargs.ArgumentCount;
ResolveConstructorArguments(name, definition, wrapper, cargs, resolvedValues);
}
else
{
// if we have constructor args, don't need to resolve them...
expectedArgCount = arguments.Length;
}
if (StringUtils.HasText(definition.FactoryObjectName))
{
// it's an instance method on the factory object's class...
factoryClass = objectFactory.GetObject(definition.FactoryObjectName).GetType();
isStatic = false;
}
else
{
// it's a static factory method on the object class...
factoryClass = definition.ObjectType;
}
GenericArgumentsHolder genericArgsInfo = new GenericArgumentsHolder(definition.FactoryMethodName);
IList <MethodInfo> factoryMethodCandidates = FindMethods(genericArgsInfo.GenericMethodName, expectedArgCount, isStatic, factoryClass);
bool autowiring = (definition.AutowireMode == AutoWiringMode.Constructor);
// try all matching methods to see if they match the constructor arguments...
for (int i = 0; i < factoryMethodCandidates.Count; i++)
{
MethodInfo factoryMethodCandidate = factoryMethodCandidates[i];
if (genericArgsInfo.ContainsGenericArguments)
{
string[] unresolvedGenericArgs = genericArgsInfo.GetGenericArguments();
if (factoryMethodCandidate.GetGenericArguments().Length != unresolvedGenericArgs.Length)
{
continue;
}
Type[] paramTypes = new Type[unresolvedGenericArgs.Length];
for (int j = 0; j < unresolvedGenericArgs.Length; j++)
{
paramTypes[j] = TypeResolutionUtils.ResolveType(unresolvedGenericArgs[j]);
}
factoryMethodCandidate = factoryMethodCandidate.MakeGenericMethod(paramTypes);
}
if (arguments == null || arguments.Length == 0)
{
Type[] paramTypes = ReflectionUtils.GetParameterTypes(factoryMethodCandidate.GetParameters());
// try to create the required arguments...
UnsatisfiedDependencyExceptionData unsatisfiedDependencyExceptionData = null;
ArgumentsHolder args = CreateArgumentArray(name, definition, resolvedValues, wrapper, paramTypes,
factoryMethodCandidate, autowiring, out unsatisfiedDependencyExceptionData);
if (args == null)
{
arguments = null;
// if we failed to match this method, keep
// trying new overloaded factory methods...
continue;
}
else
{
arguments = args.arguments;
}
}
// if we get here, we found a usable candidate factory method - check, if arguments match
//arguments = (arguments.Length == 0 ? null : arguments);
if (ReflectionUtils.GetMethodByArgumentValues(new MethodInfo[] { factoryMethodCandidate }, arguments) == null)
{
continue;
}
object objectInstance = instantiationStrategy.Instantiate(definition, name, objectFactory, factoryMethodCandidate, arguments);
wrapper.WrappedInstance = objectInstance;
#region Instrumentation
if (log.IsDebugEnabled)
{
log.Debug(string.Format(CultureInfo.InvariantCulture, "Object '{0}' instantiated via factory method [{1}].", name, factoryMethodCandidate));
}
#endregion
return(wrapper);
}
// if we get here, we didn't match any method...
throw new ObjectDefinitionStoreException(
string.Format(CultureInfo.InvariantCulture, "Cannot find matching factory method '{0} on Type [{1}].", definition.FactoryMethodName,
factoryClass));
}