public DependentItem Register(string name, Func <object> factory, DependenceLifecycles depType = DependenceLifecycles.AlwaysNew)
{
var depItem = new DependentItem(this, name, factory, depType);
this.NamedItems.Add(name, depItem);
return(depItem);
}
public DependentItem Register(string name, object value, Type valueType = null)
{
var depItem = new DependentItem(this, name, value, valueType);
this.NamedItems.Add(name, depItem);
return(depItem);
}
public DependentItem(DependentItem container, string name, Func <object> factory, DependenceLifecycles lifecycle = DependenceLifecycles.AlwaysNew)
{
this._ContainerItem = container;
this.NominalName = name;
this.Lifecycle = lifecycle;
if (lifecycle == DependenceLifecycles.AlwaysNew)
{
this._CreateInstance = factory;
}
else if (lifecycle == DependenceLifecycles.Constant)
{
object constantValue = null;
bool valueInitted = false;
this._CreateInstance = () => {
if (valueInitted)
{
return(constantValue);
}
lock (this) {
if (valueInitted)
{
return(constantValue);
}
constantValue = factory();
valueInitted = true;
}
return(constantValue);
};
}
}
public DependentItem FindDepedentItem(Type nominalType, string nominalName = null)
{
if (this._TypedItems == null)
{
return(null);
}
DependentItem result = null;
if (this._TypedItems.TryGetValue(nominalType.GUID, out result))
{
return(result);
}
if (nominalName != null && this._NamedItems != null)
{
if (this._NamedItems.TryGetValue(nominalName, out result))
{
if (nominalType.IsAssignableFrom(result.SubstantiveType))
{
return(result);
}
else
{
result = null;
}
}
}
if (this._ContainerItem != null)
{
return(this._ContainerItem.FindDepedentItem(nominalType, nominalName));
}
return(null);
}
public CreateInstanceGenerator(DependentItem item)
{
this.DependentItem = item;
//this.InstanceExpr = Expression.Parameter(item.SubstantiveType,"inst");
//this.Locals.Add(this.InstanceExpr);
}
public DependentItem GetDependentItem(Type nominalType)
{
if (this._TypedItems == null)
{
return(null);
}
DependentItem result = null;
this._TypedItems.TryGetValue(nominalType.GUID, out result);
return(result);
}
public DependentItem GetDependentItem(string nominalName)
{
if (this._NamedItems == null)
{
return(null);
}
DependentItem result = null;
this._NamedItems.TryGetValue(nominalName, out result);
return(result);
}
Expression GenNewExpression(DependentItem item, string varName)
{
var ctors = item.SubstantiveType.GetConstructors(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic);
ConstructorInfo ctorInfo = null;
ConstructorInfo noArgsCtorInfo = null;
ParameterInfo[] args = null;
var injCount = 0;
foreach (var ctor in ctors)
{
var attr1 = ctor.GetCustomAttribute <NonInjectAttribute>();
if (attr1 != null)
{
continue;
}
var attr = ctor.GetCustomAttributes <InjectAttribute>();
if (attr != null)
{
ctorInfo = ctor;
args = ctorInfo.GetParameters();
injCount++;
}
else
{
args = ctor.GetParameters();
if (args.Length == 0)
{
noArgsCtorInfo = ctor;
}
}
}
if (injCount > 1)
{
throw new InvalidProgramException("More than one Contructors were marked [Inject]");
}
if (ctorInfo == null)
{
ctorInfo = noArgsCtorInfo;
}
if (ctorInfo == null)
{
throw new InvalidProgramException("No constructors were found for injection");
}
if (args == null)
{
args = ctorInfo.GetParameters();
}
return(GenNewExpression(item, varName, ctorInfo, args));
}
object GetConstValue(DependentItem item)
{
var value = item.CreateInstance();
if (value == null)
{
return(null);
}
if (value.GetType() == item.SubstantiveType)
{
return(value);
}
return(item.SubstantiveType.GetValue(value.ToString()));
}
public DependentItem(DependentItem container, string name, object constantValue, Type valueType = null)
{
this._ContainerItem = container;
this.NominalName = name;
if (constantValue != null)
{
this.SubstantiveType = constantValue.GetType();
}
else
{
this.SubstantiveType = valueType;
}
this.Lifecycle = DependenceLifecycles.Constant;
this._CreateInstance = () => constantValue;
}
Expression GenNewExpression(DependentItem currentItem, string varName, ConstructorInfo ctor, ParameterInfo[] args)
{
var local = Expression.Parameter(ctor.DeclaringType, varName ?? "inst");
if (this.InstanceExpr == null)
{
this.InstanceExpr = local;
}
this.TypedLocals.Add(ctor.DeclaringType.GUID, local);
var paraExprs = new List <Expression>();
foreach (var paraInfo in args)
{
var type = paraInfo.ParameterType;
ParameterExpression existedExpr = null;
if (this.TypedLocals.TryGetValue(type.GUID, out existedExpr))
{
paraExprs.Add(existedExpr);
continue;
}
var name = paraInfo.Name;
var depItem = currentItem.FindDepedentItem(type, name);
if (depItem == null)
{
paraExprs.Add(Expression.Constant(paraInfo.ParameterType.GetDefaultValue(), paraInfo.ParameterType));
continue;
}
if (depItem.Lifecycle == DependenceLifecycles.Constant)
{
paraExprs.Add(Expression.Constant(GetConstValue(depItem), paraInfo.ParameterType));
}
if (this.TypedLocals.TryGetValue(depItem.SubstantiveType.GUID, out existedExpr))
{
paraExprs.Add(existedExpr);
continue;
}
var subVarName = varName + "_" + paraInfo.Name;
existedExpr = Expression.Parameter(paraInfo.ParameterType, varName + "_" + paraInfo.Name);
paraExprs.Add(existedExpr);
var instExpr = GenNewExpression(depItem, subVarName);
this.Codes.Add(Expression.Assign(existedExpr, instExpr));
}
var newExpr = Expression.New(ctor, paraExprs);
this.Codes.Add(Expression.Assign(local, newExpr));
return(local);
}
public DependentItem FindDepedentItem(string nominalName)
{
if (this._NamedItems == null)
{
return(null);
}
DependentItem result = null;
if (this._NamedItems.TryGetValue(nominalName, out result))
{
return(result);
}
if (this._ContainerItem != null)
{
return(this._ContainerItem.FindDepedentItem(nominalName));
}
return(null);
}