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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities
{
using System;
using System.Activities.Runtime;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.Serialization;
using System.Runtime;
using System.Collections.Specialized;
[DataContract]
[DebuggerDisplay("{Value}")]
public abstract class Location
{
TemporaryResolutionData temporaryResolutionData;
protected Location()
{
}
public abstract Type LocationType
{
get;
}
public object Value
{
get
{
return this.ValueCore;
}
set
{
this.ValueCore = value;
}
}
[DataMember(EmitDefaultValue = false, Name = "temporaryResolutionData")]
internal TemporaryResolutionData SerializedTemporaryResolutionData
{
get { return this.temporaryResolutionData; }
set { this.temporaryResolutionData = value; }
}
internal virtual bool CanBeMapped
{
get
{
return false;
}
}
// When we are resolving an expression that resolves to a
// reference to a location we need some way of notifying the
// LocationEnvironment that it should extract the inner location
// and throw away the outer one. OutArgument and InOutArgument
// create these TemporaryResolutionLocations if their expression
// resolution goes async and LocationEnvironment gets rid of them
// in CollapseTemporaryResolutionLocations().
internal LocationEnvironment TemporaryResolutionEnvironment
{
get
{
return this.temporaryResolutionData.TemporaryResolutionEnvironment;
}
}
internal bool BufferGetsOnCollapse
{
get
{
return this.temporaryResolutionData.BufferGetsOnCollapse;
}
}
protected abstract object ValueCore
{
get;
set;
}
internal void SetTemporaryResolutionData(LocationEnvironment resolutionEnvironment, bool bufferGetsOnCollapse)
{
this.temporaryResolutionData = new TemporaryResolutionData
{
TemporaryResolutionEnvironment = resolutionEnvironment,
BufferGetsOnCollapse = bufferGetsOnCollapse
};
}
internal virtual Location CreateReference(bool bufferGets)
{
if (this.CanBeMapped || bufferGets)
{
return new ReferenceLocation(this, bufferGets);
}
return this;
}
internal virtual object CreateDefaultValue()
{
Fx.Assert("We should only call this on Location<T>");
return null;
}
[DataContract]
internal struct TemporaryResolutionData
{
[DataMember(EmitDefaultValue = false)]
public LocationEnvironment TemporaryResolutionEnvironment
{
get;
set;
}
[DataMember(EmitDefaultValue = false)]
public bool BufferGetsOnCollapse
{
get;
set;
}
}
[DataContract]
internal class ReferenceLocation : Location
{
Location innerLocation;
bool bufferGets;
object bufferedValue;
public ReferenceLocation(Location innerLocation, bool bufferGets)
{
this.innerLocation = innerLocation;
this.bufferGets = bufferGets;
}
public override Type LocationType
{
get
{
return this.innerLocation.LocationType;
}
}
protected override object ValueCore
{
get
{
if (this.bufferGets)
{
return this.bufferedValue;
}
else
{
return this.innerLocation.Value;
}
}
set
{
this.innerLocation.Value = value;
this.bufferedValue = value;
}
}
[DataMember(Name = "innerLocation")]
internal Location SerializedInnerLocation
{
get { return this.innerLocation; }
set { this.innerLocation = value; }
}
[DataMember(EmitDefaultValue = false, Name = "bufferGets")]
internal bool SerializedBufferGets
{
get { return this.bufferGets; }
set { this.bufferGets = value; }
}
[DataMember(EmitDefaultValue = false, Name = "bufferedValue")]
internal object SerializedBufferedValue
{
get { return this.bufferedValue; }
set { this.bufferedValue = value; }
}
public override string ToString()
{
if (bufferGets)
{
return base.ToString();
}
else
{
return this.innerLocation.ToString();
}
}
}
}
[DataContract]
public class Location<T> : Location
{
T value;
public Location()
: base()
{
}
public override Type LocationType
{
get
{
return typeof(T);
}
}
public virtual new T Value
{
get
{
return this.value;
}
set
{
this.value = value;
}
}
internal T TypedValue
{
get
{
return this.Value;
}
set
{
this.Value = value;
}
}
protected override sealed object ValueCore
{
get
{
return this.Value;
}
set
{
this.Value = TypeHelper.Convert<T>(value);
}
}
[DataMember(EmitDefaultValue = false, Name = "value")]
internal T SerializedValue
{
get { return this.value; }
set { this.value = value; }
}
internal override Location CreateReference(bool bufferGets)
{
if (this.CanBeMapped || bufferGets)
{
return new ReferenceLocation(this, bufferGets);
}
return this;
}
internal override object CreateDefaultValue()
{
Fx.Assert(typeof(T).GetGenericTypeDefinition() == typeof(Location<>), "We should only be calling this with location subclasses.");
return Activator.CreateInstance<T>();
}
public override string ToString()
{
return this.value != null ? this.value.ToString() : "<null>";
}
[DataContract]
internal new class ReferenceLocation : Location<T>
{
Location<T> innerLocation;
bool bufferGets;
public ReferenceLocation(Location<T> innerLocation, bool bufferGets)
{
this.innerLocation = innerLocation;
this.bufferGets = bufferGets;
}
public override T Value
{
get
{
if (this.bufferGets)
{
return this.value;
}
else
{
return this.innerLocation.Value;
}
}
set
{
this.innerLocation.Value = value;
if (this.bufferGets)
{
this.value = value;
}
}
}
[DataMember(Name = "innerLocation")]
internal Location<T> SerializedInnerLocation
{
get { return this.innerLocation; }
set { this.innerLocation = value; }
}
[DataMember(EmitDefaultValue = false, Name = "bufferGets")]
internal bool SerializedBufferGets
{
get { return this.bufferGets; }
set { this.bufferGets = value; }
}
public override string ToString()
{
if (this.bufferGets)
{
return base.ToString();
}
else
{
return this.innerLocation.ToString();
}
}
}
}
}
|
