56 lines
2.0 KiB
C#
56 lines
2.0 KiB
C#
|
//-----------------------------------------------------------------------
|
|||
|
|
// <copyright file="IntersectIndexesEnumerator.cs" company="Microsoft Corporation">
|
|||
|
|
// Copyright (c) Microsoft Corporation.
|
|||
|
|
// </copyright>
|
|||
|
|
//-----------------------------------------------------------------------
|
|||
|
|
|
|||
|
|
namespace Microsoft.Isam.Esent.Interop
|
|||
|
|
{
|
|||
|
|
/// <summary>
|
|||
|
|
/// Enumerator that can intersect indexes and return the intersected bookmarks.
|
|||
|
|
/// </summary>
|
|||
|
|
internal sealed class IntersectIndexesEnumerator : TableEnumerator<byte[]>
|
|||
|
|
{
|
|||
|
|
/// <summary>
|
|||
|
|
/// The ranges to intersect.
|
|||
|
|
/// </summary>
|
|||
|
|
private readonly JET_INDEXRANGE[] ranges;
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// The recordlist containing the result of the intersection.
|
|||
|
|
/// </summary>
|
|||
|
|
private JET_RECORDLIST recordlist;
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Initializes a new instance of the <see cref="IntersectIndexesEnumerator"/> class.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="sesid">
|
|||
|
|
/// The session to use.
|
|||
|
|
/// </param>
|
|||
|
|
/// <param name="ranges">
|
|||
|
|
/// The ranges to intersect.
|
|||
|
|
/// </param>
|
|||
|
|
public IntersectIndexesEnumerator(JET_SESID sesid, JET_INDEXRANGE[] ranges) : base(sesid)
|
|||
|
|
{
|
|||
|
|
this.ranges = ranges;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Open the table to be enumerated. This should set <see cref="TableEnumerator{T}.TableidToEnumerate"/>.
|
|||
|
|
/// </summary>
|
|||
|
|
protected override void OpenTable()
|
|||
|
|
{
|
|||
|
|
Api.JetIntersectIndexes(this.Sesid, this.ranges, this.ranges.Length, out this.recordlist, IntersectIndexesGrbit.None);
|
|||
|
|
this.TableidToEnumerate = this.recordlist.tableid;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Gets the entry the cursor is currently positioned on.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <returns>The entry the cursor is currently positioned on.</returns>
|
|||
|
|
protected override byte[] GetCurrent()
|
|||
|
|
{
|
|||
|
|
return Api.RetrieveColumn(this.Sesid, this.TableidToEnumerate, this.recordlist.columnidBookmark);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|