mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/Runtime/XmlSortKeyAccumulator.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="XmlSortKeyAccumulator.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 //------------------------------------------------------------------------------
   7 using System;
   8 using System.Diagnostics;
   9 using System.Globalization;
  10 using System.ComponentModel;
  11
  12 namespace System.Xml.Xsl.Runtime {
  13
  14     /// <summary>
  15     /// Accumulates a list of sort keys and stores them in an array.
  16     /// </summary>
  17     [EditorBrowsable(EditorBrowsableState.Never)]
  18     public struct XmlSortKeyAccumulator {
  19         private XmlSortKey[] keys;
  20         private int pos;
  21
  22     #if DEBUG
  23         private const int DefaultSortKeyCount = 4;
  24     #else
  25         private const int DefaultSortKeyCount = 64;
  26     #endif
  27
  28         /// <summary>
  29         /// Initialize the XmlSortKeyAccumulator.
  30         /// </summary>
  31         public void Create() {
  32             if (this.keys == null)
  33                 this.keys = new XmlSortKey[DefaultSortKeyCount];
  34
  35             this.pos = 0;
  36             this.keys[0] = null;
  37         }
  38
  39         /// <summary>
  40         /// Create a new sort key and append it to the current run of sort keys.
  41         /// </summary>
  42         public void AddStringSortKey(XmlCollation collation, string value) {
  43             AppendSortKey(collation.CreateSortKey(value));
  44         }
  45
  46         public void AddDecimalSortKey(XmlCollation collation, decimal value) {
  47             AppendSortKey(new XmlDecimalSortKey(value, collation));
  48         }
  49
  50         public void AddIntegerSortKey(XmlCollation collation, long value) {
  51             AppendSortKey(new XmlIntegerSortKey(value, collation));
  52         }
  53
  54         public void AddIntSortKey(XmlCollation collation, int value) {
  55             AppendSortKey(new XmlIntSortKey(value, collation));
  56         }
  57
  58         public void AddDoubleSortKey(XmlCollation collation, double value) {
  59             AppendSortKey(new XmlDoubleSortKey(value, collation));
  60         }
  61
  62         public void AddDateTimeSortKey(XmlCollation collation, DateTime value) {
  63             AppendSortKey(new XmlDateTimeSortKey(value, collation));
  64         }
  65
  66         public void AddEmptySortKey(XmlCollation collation) {
  67             AppendSortKey(new XmlEmptySortKey(collation));
  68         }
  69
  70         /// <summary>
  71         /// Finish creating the current run of sort keys and begin a new run.
  72         /// </summary>
  73         public void FinishSortKeys() {
  74             this.pos++;
  75             if (this.pos >= this.keys.Length) {
  76                 XmlSortKey[] keysNew = new XmlSortKey[this.pos * 2];
  77                 Array.Copy(this.keys, 0, keysNew, 0, this.keys.Length);
  78                 this.keys = keysNew;
  79             }
  80             this.keys[this.pos] = null;
  81         }
  82
  83         /// <summary>
  84         /// Append new sort key to the current run of sort keys.
  85         /// </summary>
  86         private void AppendSortKey(XmlSortKey key) {
  87             // Ensure that sort will be stable by setting index of key
  88             key.Priority = this.pos;
  89
  90             if (this.keys[this.pos] == null)
  91                 this.keys[this.pos] = key;
  92             else
  93                 this.keys[this.pos].AddSortKey(key);
  94         }
  95
  96         /// <summary>
  97         /// Get array of sort keys that was constructed by this internal class.
  98         /// </summary>
  99         public Array Keys {
 100             get { return this.keys; }
 101         }
 102     }
 103 }