mcs/class/System/System.Text.RegularExpressions/MatchCollection.cs

   1 //
   2 // System.Text.RegularExpressions.MatchCollection
   3 //
   4 // Authors:
   5 //      Dan Lewis (dlewis@gmx.co.uk)
   6 //      Dick Porter (dick@ximian.com)
   7 //
   8 // (C) 2002 Dan Lewis
   9 // (C) 2004 Novell, Inc.
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Collections;
  35
  36 namespace System.Text.RegularExpressions
  37 {
  38         [Serializable]
  39         public class MatchCollection: ICollection, IEnumerable {
  40                 private Match current;
  41                 private ArrayList list;
  42
  43                 /* No public constructor */
  44                 internal MatchCollection (Match start)
  45                 {
  46                         current = start;
  47                         list = new ArrayList ();
  48                 }
  49
  50                 public virtual int Count {
  51                         get {
  52                                 TryToGet (Int32.MaxValue);
  53                                 return list.Count;
  54                         }
  55                 }
  56
  57                 public bool IsReadOnly {
  58                         get { return true; }
  59                 }
  60
  61                 public virtual bool IsSynchronized {
  62                         get { return false; }
  63                 }
  64
  65                 private bool TryToGet (int i)
  66                 {
  67                         while (i >= list.Count && current.Success) {
  68                                 list.Add (current);
  69                                 current = current.NextMatch ();
  70                         }
  71                         return i < list.Count;
  72                 }
  73
  74                 public Match this [int i] {
  75                         get {
  76                                 if (i < 0 || !TryToGet (i))
  77                                         throw new ArgumentOutOfRangeException ("index out of range", "i");
  78                                 return (Match) list [i];
  79                         }
  80                 }
  81
  82                 public virtual object SyncRoot {
  83                         get { return list; }
  84                 }
  85
  86                 public virtual void CopyTo (Array array, int index)
  87                 {
  88                         TryToGet (Int32.MaxValue);
  89                         list.CopyTo (array, index);
  90                 }
  91
  92                 public virtual IEnumerator GetEnumerator ()
  93                 {
  94                         // If !current.Success, the list is fully populated.  So, just use it.
  95                         return current.Success ? new Enumerator (this) : list.GetEnumerator ();
  96                 }
  97
  98                 class Enumerator : IEnumerator {
  99                         int index;
 100                         MatchCollection coll;
 101
 102                         internal Enumerator (MatchCollection coll)
 103                         {
 104                                 this.coll = coll;
 105                                 index = -1;
 106                         }
 107
 108                         void IEnumerator.Reset ()
 109                         {
 110                                 index = -1;
 111                         }
 112
 113                         object IEnumerator.Current {
 114                                 get {
 115                                         if (index < 0 || index >= coll.list.Count)
 116                                                 throw new InvalidOperationException ();
 117                                         return coll.list [index];
 118                                 }
 119                         }
 120
 121                         bool IEnumerator.MoveNext ()
 122                         {
 123                                 if (coll.TryToGet (++index))
 124                                         return true;
 125                                 index = coll.list.Count;
 126                                 return false;
 127                         }
 128                 }
 129         }
 130 }