Location.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Location.cs / 1305376 / Location.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 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 
    {
        [DataMember(EmitDefaultValue = false)] 
        TemporaryResolutionData temporaryResolutionData;

        protected Location()
        { 
        }
 
        public abstract Type LocationType 
        {
            get; 
        }

        public object Value
        { 
            get
            { 
                return this.ValueCore; 
            }
            set 
            {
                this.ValueCore = 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");
            return null;
        }
 
        [DataContract]
        struct TemporaryResolutionData 
        { 
            [DataMember(EmitDefaultValue = false)]
            public LocationEnvironment TemporaryResolutionEnvironment 
            {
                get;
                set;
            } 

            [DataMember(EmitDefaultValue = false)] 
            public bool BufferGetsOnCollapse 
            {
                get; 
                set;
            }
        }
 
        [DataContract]
        class ReferenceLocation : Location 
        { 
            [DataMember]
            Location innerLocation; 
            [DataMember(EmitDefaultValue = false)]
            bool bufferGets;
            [DataMember(EmitDefaultValue = false)]
            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; 
                }
            }

            public override string ToString() 
            {
                if (bufferGets) 
                { 
                    return base.ToString();
                } 
                else
                {
                    return this.innerLocation.ToString();
                } 
            }
        } 
    } 

    [DataContract] 
    public class Location : Location
    {
        [DataMember(EmitDefaultValue = false)]
        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(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();
        } 

        public override string ToString()
        {
            return this.value != null ? this.value.ToString() : ""; 
        }
 
        [DataContract] 
        class ReferenceLocation : Location
        { 
            [DataMember]
            Location innerLocation;
            [DataMember(EmitDefaultValue = false)]
            bool bufferGets; 

            public ReferenceLocation(Location 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; 
                    }
                } 
            } 

            public override string ToString() 
            {
                if (this.bufferGets)
                {
                    return base.ToString(); 
                }
                else 
                { 
                    return this.innerLocation.ToString();
                } 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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Location.cs source code in C# .NET

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