SegmentInfo.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Server / System / Data / Services / SegmentInfo.cs / 1305376 / SegmentInfo.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
//      Structure containing information about a segment (Uri is made
//      up of bunch of segments, each segment is seperated by '/' character) 
//  
//
// @owner [....] 
//---------------------------------------------------------------------

namespace System.Data.Services
{ 
    #region Namespaces.
 
    using System; 
    using System.Collections;
    using System.Data.Services.Providers; 
    using System.Diagnostics;
    using System.Linq;

    #endregion Namespaces. 

    /// Contains the information regarding a segment that makes up the uri 
    [DebuggerDisplay("SegmentInfo={Identifier} -> {TargetKind} '{TargetResourceType.InstanceType}'")] 
    internal class SegmentInfo
    { 
        #region Private fields.

        /// Returns the identifier for this segment i.e. string part without the keys.
        private string identifier; 

        /// Returns the values that constitute the key as specified in the request. 
        private KeyInstance key; 

        /// Returns the query that's being composed for this segment 
        private IEnumerable requestEnumerable;

        /// Whether the segment targets a single result or not.
        private bool singleResult; 

        /// resource set if applicable. 
        private ResourceSetWrapper targetContainer; 

        /// The type of resource targeted by this segment. 
        private ResourceType targetResourceType;

        /// The kind of resource targeted by this segment.
        private RequestTargetKind targetKind; 

        /// Returns the source for this segment 
        private RequestTargetSource targetSource; 

        /// Service operation being invoked. 
        private ServiceOperationWrapper operation;

        /// Operation parameters.
        private object[] operationParameters; 

        /// Returns the property that is being projected in this segment, if there's any. 
        private ResourceProperty projectedProperty; 

        #endregion Private fields. 

        /// Empty constructor.
        internal SegmentInfo()
        { 
        }
 
        /// Copy constructor. 
        /// Another  to get a shallow copy of.
        internal SegmentInfo(SegmentInfo other) 
        {
            Debug.Assert(other != null, "other != null");
            this.Identifier = other.Identifier;
            this.Key = other.Key; 
            this.Operation = other.Operation;
            this.OperationParameters = other.OperationParameters; 
            this.ProjectedProperty = other.ProjectedProperty; 
            this.RequestEnumerable = other.RequestEnumerable;
            this.SingleResult = other.SingleResult; 
            this.TargetContainer = other.TargetContainer;
            this.TargetKind = other.TargetKind;
            this.TargetSource = other.TargetSource;
            this.targetResourceType = other.targetResourceType; 
        }
 
        /// Returns the identifier for this segment i.e. string part without the keys. 
        internal string Identifier
        { 
            get { return this.identifier; }
            set { this.identifier = value; }
        }
 
        /// Returns the values that constitute the key as specified in the request.
        internal KeyInstance Key 
        { 
            get { return this.key; }
            set { this.key = value; } 
        }

        /// Returns the query that's being composed for this segment
        internal IEnumerable RequestEnumerable 
        {
            get { return this.requestEnumerable; } 
            set { this.requestEnumerable = value; } 
        }
 
        /// Whether the segment targets a single result or not.
        internal bool SingleResult
        {
            get { return this.singleResult; } 
            set { this.singleResult = value; }
        } 
 
        /// resource set if applicable.
        internal ResourceSetWrapper TargetContainer 
        {
            get { return this.targetContainer; }
            set { this.targetContainer = value; }
        } 

        /// The type of element targeted by this segment. 
        internal ResourceType TargetResourceType 
        {
            get { return this.targetResourceType; } 
            set { this.targetResourceType = value; }
        }

        /// The kind of resource targeted by this segment. 
        internal RequestTargetKind TargetKind
        { 
            get { return this.targetKind; } 
            set { this.targetKind = value; }
        } 

        /// Returns the source for this segment
        internal RequestTargetSource TargetSource
        { 
            get { return this.targetSource; }
            set { this.targetSource = value; } 
        } 

        /// Service operation being invoked. 
        internal ServiceOperationWrapper Operation
        {
            get { return this.operation; }
            set { this.operation = value; } 
        }
 
        /// Operation parameters. 
        internal object[] OperationParameters
        { 
            get { return this.operationParameters; }
            set { this.operationParameters  = value; }
        }
 
        /// Returns the property that is being projected in this segment, if there's any.
        internal ResourceProperty ProjectedProperty 
        { 
            get { return this.projectedProperty; }
            set { this.projectedProperty = value; } 
        }

        /// Returns true if this segment has a key filter with values; false otherwise.
        internal bool HasKeyValues 
        {
            get { return this.Key != null && !this.Key.IsEmpty; } 
        } 

        ///  
        /// Determines whether the target kind is a direct reference to an element
        /// i.e. either you have a $value or you are accessing a resource via key property
        /// (/Customers(1) or /Customers(1)/BestFriend/Orders('Foo'). Either case the value
        /// cannot be null. 
        /// 
        /// Kind of request to evaluate. 
        ///  
        /// A characteristic of a direct reference is that if its value
        /// is null, a 404 error should be returned. 
        /// 
        internal bool IsDirectReference
        {
            get 
            {
                return 
                    this.TargetKind == RequestTargetKind.PrimitiveValue || 
                    this.TargetKind == RequestTargetKind.OpenPropertyValue ||
                    this.HasKeyValues; 
            }
        }

        /// Returns the query for this segment, possibly null. 
        internal IQueryable RequestQueryable
        { 
            get 
            {
                return this.RequestEnumerable as IQueryable; 
            }

            set
            { 
                this.RequestEnumerable = value;
            } 
        } 

#if DEBUG 
        /// In DEBUG builds, ensures that invariants for the class hold.
        internal void AssertValid()
        {
            WebUtil.DebugEnumIsDefined(this.TargetKind); 
            WebUtil.DebugEnumIsDefined(this.TargetSource);
            Debug.Assert(this.TargetKind != RequestTargetKind.Nothing, "targetKind != RequestTargetKind.Nothing"); 
            Debug.Assert( 
                this.TargetContainer == null || this.TargetSource != RequestTargetSource.None,
                "'None' targets should not have a resource set."); 
            Debug.Assert(
                this.TargetKind != RequestTargetKind.Resource ||
                this.TargetContainer != null ||
                this.TargetKind == RequestTargetKind.OpenProperty || 
                this.TargetSource == RequestTargetSource.ServiceOperation,
                "All resource targets (except for some service operations and open properties) should have a container."); 
            Debug.Assert( 
                this.TargetContainer == null || this.TargetContainer.ResourceType.IsAssignableFrom(this.TargetResourceType),
                "If targetContainer is assigned, it should be equal to (or assignable to) the segment's element type."); 
            Debug.Assert(
                !String.IsNullOrEmpty(this.Identifier) || RequestTargetSource.None == this.TargetSource || RequestTargetKind.VoidServiceOperation == this.TargetKind,
                "identifier must not be empty or null except for none or void service operation");
        } 
#endif
    } 
} 

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

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