private InjectionPlan BuildClassNodeInjectionPlan(IClassNode cn,
object cachedInstance,
IClassNode externalConstructor,
IClassNode boundImpl,
IClassNode defaultImpl,
IDictionary <INode, InjectionPlan> memo)
{
if (cachedInstance != null)
{
return(new CsInstance(cn, cachedInstance));
}
else if (externalConstructor != null)
{
BuildInjectionPlan(externalConstructor, memo);
InjectionPlan ip = null;
memo.TryGetValue(externalConstructor, out ip);
return(new Subplan(cn, 0, new InjectionPlan[] { ip }));
}
else if (boundImpl != null && !cn.Equals(boundImpl))
{
// We need to delegate to boundImpl, so recurse.
BuildInjectionPlan(boundImpl, memo);
InjectionPlan ip = null;
memo.TryGetValue(boundImpl, out ip);
return(new Subplan(cn, 0, new InjectionPlan[] { ip }));
}
else if (defaultImpl != null && !cn.Equals(defaultImpl))
{
BuildInjectionPlan(defaultImpl, memo);
InjectionPlan ip = null;
memo.TryGetValue(defaultImpl, out ip);
return(new Subplan(cn, 0, new InjectionPlan[] { ip }));
}
else
{
// if we're here and there is a bound impl or a default impl,
// then we're bound / defaulted to ourselves, so don't add
// other impls to the list of things to consider.
List <IClassNode> candidateImplementations = new List <IClassNode>();
if (boundImpl == null && defaultImpl == null)
{
foreach (var ki in cn.GetKnownImplementations())
{
candidateImplementations.Add(ki);
}
}
candidateImplementations.Add(cn);
List <InjectionPlan> sub_ips = FilterCandidateConstructors(candidateImplementations, memo);
if (candidateImplementations.Count == 1 && candidateImplementations[0].GetFullName().Equals(cn.GetFullName()))
{
return(WrapInjectionPlans(cn, sub_ips, false, -1));
}
else
{
return(WrapInjectionPlans(cn, sub_ips, true, -1));
}
}
}
private String ShallowArgString(InjectionPlan arg)
{
if (arg is Constructor || arg is Subplan)
{
return(arg.GetType().Name + ": " + arg.GetNode().GetName());
}
else
{
return(arg.ToShallowString());
}
}
private object GetInstance(INode node)
{
InjectionPlan plan = (InjectionPlan)GetInjectionPlan(node);
object u = InjectFromPlan(plan);
//while(pendingFutures.Count != 0)
//{
// Iterator<InjectionFuture<?>> i = pendingFutures.iterator();
// InjectionFuture f = i.next();
// pendingFutures.remove(f);
// f.Get();
//}
return(u);
}
public InjectionPlan GetInjectionPlan(INode n)
{
//assertNotConcurrent();
IDictionary <INode, InjectionPlan> memo = new Dictionary <INode, InjectionPlan>();
BuildInjectionPlan(n, memo);
InjectionPlan p = null;
memo.TryGetValue(n, out p);
if (p != null)
{
return(p);
}
throw new InjectionException("Fail to get injection plan" + n);
}
public object InjectFromPlan(InjectionPlan plan)
{
if (!plan.IsFeasible())
{
throw new InjectionException("Cannot inject " + plan.GetNode().GetFullName() + ": "
+ plan.ToCantInjectString());
}
if (plan.IsAmbiguous())
{
throw new InjectionException("Cannot inject " + plan.GetNode().GetFullName() + " "
+ plan.ToCantInjectString());
}
if (plan is InjectionFuturePlan)
{
InjectionFuturePlan fut = (InjectionFuturePlan)plan;
string key = fut.GetNode().GetFullName();
try
{
//we will see if we need to introduce T to replace object
InjectionFuture ret = new InjectionFuture(this, classHierarchy.ClassForName(fut.GetNode().GetFullName()));
pendingFutures.Add(ret);
return(ret);
}
catch (TypeLoadException e)
{
throw new InjectionException("Could not get class for " + key);
}
}
else if (plan.GetNode() is IClassNode && null != GetCachedInstance((IClassNode)plan.GetNode()))
{
return(GetCachedInstance((IClassNode)plan.GetNode()));
}
else if (plan is CsInstance)
{
// TODO: Must be named parameter node. Check.
// throw new IllegalStateException("Instance from plan not in Injector's set of instances?!?");
return(((CsInstance)plan).instance);
}
else if (plan is Constructor)
{
Constructor constructor = (Constructor)plan;
object[] args = new object[constructor.GetArgs().Length];
InjectionPlan[] argPlans = constructor.GetArgs();
for (int i = 0; i < argPlans.Length; i++)
{
args[i] = InjectFromPlan(argPlans[i]);
}
try
{
concurrentModificationGuard = true;
object ret;
try
{
IConstructorDef def = (IConstructorDef)constructor.GetConstructorDef();
ConstructorInfo c = GetConstructor(def);
if (aspect != null)
{
ret = aspect.Inject(def, c, args);
}
else
{
ret = c.Invoke(args);
}
}
catch (ArgumentException e)
{
StringBuilder sb = new StringBuilder("Internal Tang error? Could not call constructor " + constructor.GetConstructorDef() + " with arguments [");
foreach (Object o in args)
{
sb.Append("\n\t" + o);
}
sb.Append("]");
throw new IllegalStateException(sb.ToString(), e);
}
if (ret is IExternalConstructor)
{
ret = ((IExternalConstructor)ret).NewInstance();
}
instances.Add(constructor.GetNode(), ret);
return(ret);
}
catch (Exception e)
{
throw new InjectionException("Could not invoke constructor: " + plan, e); //check what exception might be got and refine it
} finally
{
concurrentModificationGuard = false;
}
}
else if (plan is Subplan)
{
Subplan ambiguous = (Subplan)plan;
return(InjectFromPlan(ambiguous.GetDelegatedPlan()));
}
else if (plan is SetInjectionPlan)
{
SetInjectionPlan setPlan = (SetInjectionPlan)plan;
ISet <object> ret = new MonotonicSet <object>();
foreach (InjectionPlan subplan in setPlan.GetEntryPlans())
{
ret.Add(InjectFromPlan(subplan));
}
return(ret);
}
else
{
throw new IllegalStateException("Unknown plan type: " + plan);
}
}
private List <InjectionPlan> FilterCandidateConstructors(
List <IClassNode> candidateImplementations,
IDictionary <INode, InjectionPlan> memo)
{
List <InjectionPlan> sub_ips = new List <InjectionPlan>();
foreach (IClassNode thisCN in candidateImplementations)
{
List <InjectionPlan> constructors = new List <InjectionPlan>();
List <IConstructorDef> constructorList = new List <IConstructorDef>();
if (null != this.configuration.GetLegacyConstructor(thisCN))
{
constructorList.Add(this.configuration.GetLegacyConstructor(thisCN));
}
foreach (var c in thisCN.GetInjectableConstructors())
{
constructorList.Add(c);
}
foreach (IConstructorDef def in constructorList)
{
List <InjectionPlan> args = new List <InjectionPlan>();
IConstructorArg[] defArgs = def.GetArgs().ToArray <IConstructorArg>();
foreach (IConstructorArg arg in defArgs)
{
if (!arg.IsInjectionFuture())
{
try
{
INode argNode = this.classHierarchy.GetNode(arg.GetName());
BuildInjectionPlan(argNode, memo);
InjectionPlan ip = null;
memo.TryGetValue(argNode, out ip);
args.Add(ip);
}
catch (NameResolutionException e)
{
throw new IllegalStateException("Detected unresolvable "
+ "constructor arg while building injection plan. "
+ "This should have been caught earlier!", e);
}
}
else
{
try
{
args.Add(new InjectionFuturePlan(this.classHierarchy.GetNode(arg.GetName())));
} catch (NameResolutionException e) {
throw new IllegalStateException("Detected unresolvable "
+ "constructor arg while building injection plan. "
+ "This should have been caught earlier!", e);
}
}
}
Constructor constructor = new Constructor(thisCN, def, args.ToArray());
constructors.Add(constructor);
}
// The constructors are embedded in a lattice defined by
// isMoreSpecificThan(). We want to see if, amongst the injectable
// plans, there is a unique dominant plan, and select it.
// First, compute the set of injectable plans.
List <Int32> liveIndices = new List <Int32>();
for (int i = 0; i < constructors.Count; i++)
{
if (constructors[i].GetNumAlternatives() > 0)
{
liveIndices.Add(i);
}
}
// Now, do an all-by-all comparison, removing indices that are dominated
// by others.
for (int i = 0; i < liveIndices.Count; i++)
{
for (int j = i + 1; j < liveIndices.Count; j++)
{
IConstructorDef ci = ((Constructor)constructors[(liveIndices[i])]).GetConstructorDef();
IConstructorDef cj = ((Constructor)constructors[(liveIndices[j])]).GetConstructorDef();
if (ci.IsMoreSpecificThan(cj))
{
liveIndices.Remove(j);
j--;
}
else if (cj.IsMoreSpecificThan(ci))
{
liveIndices.Remove(j);
// Done with this inner loop invocation. Check the new ci.
i--;
break;
}
}
}
sub_ips.Add(WrapInjectionPlans(thisCN, constructors, false, liveIndices.Count == 1 ? liveIndices[0] : -1));
}
return(sub_ips);
}
private void BuildInjectionPlan(INode n, IDictionary <INode, InjectionPlan> memo)
{
if (memo.ContainsKey(n))
{
InjectionPlan p = null;
memo.TryGetValue(n, out p);
if (BUILDING == p)
{
StringBuilder loopyList = new StringBuilder("[");
foreach (INode node in memo.Keys)
{
InjectionPlan p1 = null;
memo.TryGetValue(node, out p1);
if (p1 == BUILDING)
{
loopyList.Append(" " + node.GetFullName());
}
}
loopyList.Append(" ]");
throw new ClassHierarchyException("Detected loopy constructor involving "
+ loopyList.ToString());
}
else
{
return;
}
}
memo.Add(n, BUILDING);
InjectionPlan ip = null;
if (n is INamedParameterNode)
{
INamedParameterNode np = (INamedParameterNode)n;
object boundInstance = ParseBoundNamedParameter(np);
object defaultInstance = this.classHierarchy.ParseDefaultValue(np);
object instance = boundInstance != null ? boundInstance : defaultInstance;
if (instance is INode)
{
BuildInjectionPlan((INode)instance, memo);
InjectionPlan sp = null;
memo.TryGetValue((INode)instance, out sp);
if (sp != null)
{
ip = new Subplan(n, 0, new InjectionPlan[] { sp });
}
}
else if (instance is ISet <object> )
{
ISet <object> entries = (ISet <object>)instance;
ISet <InjectionPlan> plans = new MonotonicSet <InjectionPlan>();
foreach (object entry in entries)
{
if (entry is IClassNode)
{
BuildInjectionPlan((IClassNode)entry, memo);
InjectionPlan p2 = null;
memo.TryGetValue((INode)entry, out p2);
if (p2 != null)
{
plans.Add(p2);
}
}
else
{
plans.Add(new CsInstance(n, entry));
}
}
ip = new SetInjectionPlan(n, plans);
}
else
{
ip = new CsInstance(np, instance);
}
}
else if (n is IClassNode)
{
IClassNode cn = (IClassNode)n;
// Any (or all) of the next four values might be null; that's fine.
object cached = GetCachedInstance(cn);
IClassNode boundImpl = this.configuration.GetBoundImplementation(cn);
IClassNode defaultImpl = ParseDefaultImplementation(cn);
IClassNode ec = this.configuration.GetBoundConstructor(cn);
ip = BuildClassNodeInjectionPlan(cn, cached, ec, boundImpl, defaultImpl, memo);
}
else if (n is IPackageNode)
{
throw new ArgumentException(
"Request to instantiate Java package as object");
}
else
{
throw new IllegalStateException(
"Type hierarchy contained unknown node type!:" + n);
}
memo[n] = ip;
}
public InjectionPlan[] GetPlans()
{
InjectionPlan[] copy = new InjectionPlan[alternatives.Length];
Array.Copy(alternatives, copy, alternatives.Length); // not sure if it does deep copy??
return(copy);
}