EventLogEntryCollection.cs :  » 2.6.4-mono-.net-core » System.Diagnostics » System » Diagnostics » C# / CSharp Open Source

//
// System.Diagnostics.EventLogEntryCollection.cs
//
// Authors:
//   Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2002 Jonathan Pryor
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.Collections;
using System.Diagnostics;

namespace System.Diagnostics{

  public class EventLogEntryCollection : ICollection, IEnumerable {

    readonly EventLogImpl _impl;

    internal EventLogEntryCollection(EventLogImpl impl)
    {
      _impl = impl;
    }

    public int Count {
      get { return _impl.EntryCount; }
    }

    public virtual EventLogEntry this [int index] {
      get { return _impl[index]; }
    }

    bool ICollection.IsSynchronized {
      get { return false; }
    }

    object ICollection.SyncRoot {
      get { return this; }
    }

    public void CopyTo (EventLogEntry[] eventLogEntries, int index)
    {
      EventLogEntry[] entries = _impl.GetEntries ();
      Array.Copy (entries, 0, eventLogEntries, index, entries.Length);
    }

    public IEnumerator GetEnumerator ()
    {
      return new EventLogEntryEnumerator (_impl);
    }

    void ICollection.CopyTo (Array array, int index)
    {
      EventLogEntry[] entries = _impl.GetEntries ();
      Array.Copy (entries, 0, array, index, entries.Length);
    }

    private class EventLogEntryEnumerator : IEnumerator
    {
      internal EventLogEntryEnumerator (EventLogImpl impl)
      {
        _impl = impl;
      }

      object IEnumerator.Current {
        get { return Current; }
      }

      public EventLogEntry Current {
        get {
#if NET_2_0
          if (_currentEntry != null)
            return _currentEntry;
#else
          if (_currentIndex >= 0 && _currentIndex < _impl.EntryCount)
            return _impl [_currentIndex];
#endif

          throw new InvalidOperationException ("No current EventLog"
            + " entry available, cursor is located before the first"
            + " or after the last element of the enumeration.");
        }
      }

      public bool MoveNext ()
      {
        _currentIndex++;
#if NET_2_0
        if (_currentIndex >= _impl.EntryCount) {
          _currentEntry = null;
          return false;
        }
        _currentEntry = _impl [_currentIndex];
        return true;
#else
        return (_currentIndex < _impl.EntryCount);
#endif
      }

      public void Reset ()
      {
        _currentIndex = - 1;
      }

      readonly EventLogImpl _impl;
      int _currentIndex = -1;
#if NET_2_0
      EventLogEntry _currentEntry;
#endif
    }
}
}