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. /// Anotherto 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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