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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities
{
using System.Activities.Validation;
using System.Collections.Generic;
using System.Runtime;
[Fx.Tag.XamlVisible(false)]
sealed class ActivityLocationReferenceEnvironment : LocationReferenceEnvironment
{
Dictionary<string, LocationReference> declarations;
List<LocationReference> unnamedDeclarations;
public ActivityLocationReferenceEnvironment()
{
}
public ActivityLocationReferenceEnvironment(LocationReferenceEnvironment parent)
{
this.Parent = parent;
if (this.Parent != null)
{
this.InternalRoot = parent.Root;
}
}
public override Activity Root
{
get
{
return this.InternalRoot;
}
}
public Activity InternalRoot
{
get;
set;
}
Dictionary<string, LocationReference> Declarations
{
get
{
if (this.declarations == null)
{
this.declarations = new Dictionary<string, LocationReference>();
}
return this.declarations;
}
}
public override bool IsVisible(LocationReference locationReference)
{
if (locationReference == null)
{
throw FxTrace.Exception.ArgumentNull("locationReference");
}
LocationReferenceEnvironment currentScope = this;
while (currentScope != null)
{
ActivityLocationReferenceEnvironment activityEnvironment = currentScope as ActivityLocationReferenceEnvironment;
if (activityEnvironment != null)
{
if (activityEnvironment.declarations != null)
{
foreach (LocationReference declaration in activityEnvironment.declarations.Values)
{
if (locationReference == declaration)
{
return true;
}
}
}
if (activityEnvironment.unnamedDeclarations != null)
{
for (int i = 0; i < activityEnvironment.unnamedDeclarations.Count; i++)
{
if (locationReference == activityEnvironment.unnamedDeclarations[i])
{
return true;
}
}
}
}
else
{
return currentScope.IsVisible(locationReference);
}
currentScope = currentScope.Parent;
}
return false;
}
public void Declare(LocationReference locationReference, Activity owner, ref IList<ValidationError> validationErrors)
{
Fx.Assert(locationReference != null, "Must not be null");
if (locationReference.Name == null)
{
if (this.unnamedDeclarations == null)
{
this.unnamedDeclarations = new List<LocationReference>();
}
this.unnamedDeclarations.Add(locationReference);
}
else
{
if (this.Declarations.ContainsKey(locationReference.Name))
{
string id = null;
if (owner != null)
{
id = owner.Id;
}
ValidationError validationError = new ValidationError(SR.SymbolNamesMustBeUnique(locationReference.Name))
{
Source = owner,
Id = id
};
ActivityUtilities.Add(ref validationErrors, validationError);
}
else
{
this.Declarations.Add(locationReference.Name, locationReference);
}
}
}
public override bool TryGetLocationReference(string name, out LocationReference result)
{
if (name == null)
{
// We don't allow null names in our LocationReferenceEnvironment but
// a custom declared environment might. We need to walk up
// to the root and see if it chains to a
// non-ActivityLocationReferenceEnvironment implementation
LocationReferenceEnvironment currentEnvironment = this.Parent;
while (currentEnvironment is ActivityLocationReferenceEnvironment)
{
currentEnvironment = currentEnvironment.Parent;
}
if (currentEnvironment != null)
{
Fx.Assert(!(currentEnvironment is ActivityLocationReferenceEnvironment), "We must be at a non-ActivityLocationReferenceEnvironment implementation.");
return currentEnvironment.TryGetLocationReference(name, out result);
}
}
else
{
if (this.declarations != null && this.declarations.TryGetValue(name, out result))
{
return true;
}
bool found = false;
LocationReferenceEnvironment currentEnvironment = this.Parent;
LocationReferenceEnvironment rootEnvironment = this;
// Loop through all of the ActivityLocationReferenceEnvironments we have chained together
while (currentEnvironment != null && currentEnvironment is ActivityLocationReferenceEnvironment)
{
ActivityLocationReferenceEnvironment activityEnvironment = (ActivityLocationReferenceEnvironment)currentEnvironment;
if (activityEnvironment.declarations != null && activityEnvironment.declarations.TryGetValue(name, out result))
{
return true;
}
rootEnvironment = currentEnvironment;
currentEnvironment = currentEnvironment.Parent;
}
if (!found)
{
if (currentEnvironment != null)
{
// Looks like we have a non-ActivityLocationReferenceEnvironment at the root
Fx.Assert(!(currentEnvironment is ActivityLocationReferenceEnvironment), "We should have some other host environment at this point.");
if (currentEnvironment.TryGetLocationReference(name, out result))
{
return true;
}
}
}
}
result = null;
return false;
}
public override IEnumerable<LocationReference> GetLocationReferences()
{
return this.Declarations.Values;
}
}
}
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