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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities
{
using System;
using System.Activities.Expressions;
class InlinedLocationReference : LocationReference, ILocationReferenceWrapper
{
LocationReference innerReference;
Activity validAccessor;
bool allowReads;
bool allowWrites;
bool allowGetLocation;
public InlinedLocationReference(LocationReference innerReference, Activity validAccessor, ArgumentDirection accessDirection)
{
this.innerReference = innerReference;
this.validAccessor = validAccessor;
this.allowReads = accessDirection != ArgumentDirection.Out;
this.allowWrites = accessDirection != ArgumentDirection.In;
}
public InlinedLocationReference(LocationReference innerReference, Activity validAccessor)
{
this.innerReference = innerReference;
this.validAccessor = validAccessor;
this.allowReads = true;
this.allowWrites = true;
this.allowGetLocation = true;
}
protected override string NameCore
{
get
{
return this.innerReference.Name;
}
}
protected override Type TypeCore
{
get
{
return this.innerReference.Type;
}
}
public override Location GetLocation(ActivityContext context)
{
if (context == null)
{
throw FxTrace.Exception.ArgumentNull("context");
}
ValidateAccessor(context);
if (!this.allowGetLocation)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.GetLocationOnPublicAccessReference(context.Activity)));
}
return GetLocationCore(context);
}
internal override Location GetLocationForRead(ActivityContext context)
{
ValidateAccessor(context);
if (!this.allowReads)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.ReadAccessToWriteOnlyPublicReference(context.Activity)));
}
return GetLocationCore(context);
}
internal override Location GetLocationForWrite(ActivityContext context)
{
ValidateAccessor(context);
if (!this.allowWrites)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.WriteAccessToReadOnlyPublicReference(context.Activity)));
}
return GetLocationCore(context);
}
void ValidateAccessor(ActivityContext context)
{
// We need to call ThrowIfDisposed explicitly since
// context.Activity does not check isDisposed
context.ThrowIfDisposed();
if (!object.ReferenceEquals(context.Activity, this.validAccessor))
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InlinedLocationReferenceOnlyAccessibleByOwner(context.Activity, this.validAccessor)));
}
}
Location GetLocationCore(ActivityContext context)
{
try
{
context.AllowChainedEnvironmentAccess = true;
return this.innerReference.GetLocation(context);
}
finally
{
context.AllowChainedEnvironmentAccess = false;
}
}
LocationReference ILocationReferenceWrapper.LocationReference
{
get
{
return this.innerReference;
}
}
}
}
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