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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Activities
{
using System;
using System.Runtime;
using System.Diagnostics;
using System.Activities.Expressions;
public struct CodeActivityPublicEnvironmentAccessor
{
CodeActivityMetadata metadata;
bool withoutArgument;
public CodeActivityMetadata ActivityMetadata
{
get { return this.metadata; }
}
public static CodeActivityPublicEnvironmentAccessor Create(CodeActivityMetadata metadata)
{
metadata.ThrowIfDisposed();
AssertIsCodeActivity(metadata.CurrentActivity);
CodeActivityPublicEnvironmentAccessor result = new CodeActivityPublicEnvironmentAccessor();
result.metadata = metadata;
return result;
}
internal static CodeActivityPublicEnvironmentAccessor CreateWithoutArgument(CodeActivityMetadata metadata)
{
CodeActivityPublicEnvironmentAccessor toReturn = Create(metadata);
toReturn.withoutArgument = true;
return toReturn;
}
public static bool operator ==(CodeActivityPublicEnvironmentAccessor left, CodeActivityPublicEnvironmentAccessor right)
{
return left.Equals(right);
}
public static bool operator !=(CodeActivityPublicEnvironmentAccessor left, CodeActivityPublicEnvironmentAccessor right)
{
return !left.Equals(right);
}
public bool TryGetAccessToPublicLocation(LocationReference publicLocation,
ArgumentDirection accessDirection, out LocationReference equivalentLocation)
{
if (publicLocation == null)
{
throw FxTrace.Exception.ArgumentNull("publicLocation");
}
ThrowIfUninitialized();
return TryGetAccessToPublicLocation(publicLocation, accessDirection, false, out equivalentLocation);
}
public bool TryGetReferenceToPublicLocation(LocationReference publicReference,
out LocationReference equivalentReference)
{
if (publicReference == null)
{
throw FxTrace.Exception.ArgumentNull("publicReference");
}
ThrowIfUninitialized();
return TryGetReferenceToPublicLocation(publicReference, false, out equivalentReference);
}
public override bool Equals(object obj)
{
if (!(obj is CodeActivityPublicEnvironmentAccessor))
{
return false;
}
CodeActivityPublicEnvironmentAccessor other = (CodeActivityPublicEnvironmentAccessor)obj;
return other.metadata == this.metadata;
}
public override int GetHashCode()
{
return this.metadata.GetHashCode();
}
// In 4.0 the expression type for publicly inspectable auto-generated arguments was
// LocationReferenceValue<T>, whether the argument was actually used as an L-Value or R-Value.
// We keep that for back-compat (useLocationReferenceValue == true), and only use the new
// EnvironmentLocationValue/Reference classes for new activities.
internal bool TryGetAccessToPublicLocation(LocationReference publicLocation,
ArgumentDirection accessDirection, bool useLocationReferenceValue, out LocationReference equivalentLocation)
{
Fx.Assert(!useLocationReferenceValue || this.ActivityMetadata.CurrentActivity.UseOldFastPath, "useLocationReferenceValue should only be used for back-compat");
if (this.metadata.Environment.IsVisible(publicLocation))
{
if (!this.withoutArgument)
{
CreateArgument(publicLocation, accessDirection, useLocationReferenceValue);
}
equivalentLocation = new InlinedLocationReference(publicLocation, this.metadata.CurrentActivity, accessDirection);
return true;
}
equivalentLocation = null;
return false;
}
internal bool TryGetReferenceToPublicLocation(LocationReference publicReference,
bool useLocationReferenceValue, out LocationReference equivalentReference)
{
Fx.Assert(!useLocationReferenceValue || this.ActivityMetadata.CurrentActivity.UseOldFastPath, "useLocationReferenceValue should only be used for back-compat");
if (this.metadata.Environment.IsVisible(publicReference))
{
if (!this.withoutArgument)
{
CreateLocationArgument(publicReference, useLocationReferenceValue);
}
equivalentReference = new InlinedLocationReference(publicReference, this.metadata.CurrentActivity);
return true;
}
equivalentReference = null;
return false;
}
internal void CreateArgument(LocationReference sourceReference, ArgumentDirection accessDirection, bool useLocationReferenceValue = false)
{
ActivityWithResult expression = ActivityUtilities.CreateLocationAccessExpression(sourceReference, accessDirection != ArgumentDirection.In, useLocationReferenceValue);
AddGeneratedArgument(sourceReference.Type, accessDirection, expression);
}
internal void CreateLocationArgument(LocationReference sourceReference, bool useLocationReferenceValue = false)
{
ActivityWithResult expression = ActivityUtilities.CreateLocationAccessExpression(sourceReference, true, useLocationReferenceValue);
AddGeneratedArgument(expression.ResultType, ArgumentDirection.In, expression);
}
void AddGeneratedArgument(Type argumentType, ArgumentDirection direction, ActivityWithResult expression)
{
Argument argument = ActivityUtilities.CreateArgument(argumentType, direction);
argument.Expression = expression;
RuntimeArgument runtimeArgument = this.metadata.CurrentActivity.AddTempAutoGeneratedArgument(argumentType, direction);
Argument.TryBind(argument, runtimeArgument, this.metadata.CurrentActivity);
}
void ThrowIfUninitialized()
{
if (this.metadata.CurrentActivity == null)
{
// Using ObjectDisposedException for consistency with the other metadata structs
throw FxTrace.Exception.AsError(new ObjectDisposedException(ToString()));
}
}
[Conditional("DEBUG")]
static void AssertIsCodeActivity(Activity activity)
{
Type codeActivityOfTType = null;
ActivityWithResult activityWithResult = activity as ActivityWithResult;
if (activityWithResult != null)
{
codeActivityOfTType = typeof(CodeActivity<>).MakeGenericType(activityWithResult.ResultType);
}
Fx.Assert(activity is CodeActivity || (codeActivityOfTType != null && codeActivityOfTType.IsAssignableFrom(activity.GetType())), "Expected CodeActivity or CodeActivity<T>");
}
}
}
|
