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// Copyright © 2006-2010 Travis Robinson. All rights reserved.
//
// website: http://sourceforge.net/projects/libusbdotnet
// e-mail: libusbdotnet@gmail.com
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. or
// visit www.gnu.org.
//
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace MonoLibUsb.Profile
{
/// <summary>
/// A forward-only enumerator for iterating a device lists.
/// </summary>
internal class MonoUsbProfileHandleEnumerator : IEnumerator<MonoUsbProfileHandle>
{
private readonly MonoUsbProfileListHandle mProfileListHandle;
private MonoUsbProfileHandle mCurrentProfile;
private int mNextDeviceProfilePos;
internal MonoUsbProfileHandleEnumerator(MonoUsbProfileListHandle profileListHandle)
{
mProfileListHandle = profileListHandle;
Reset();
}
#region IEnumerator<MonoUsbProfileHandle> Members
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
/// <filterpriority>2</filterpriority>
public void Dispose() { Reset(); }
/// <summary>
/// Advances the enumerator to the next <see cref="MonoUsbProfileHandle"/> element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element; false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception><filterpriority>2</filterpriority>
public bool MoveNext()
{
IntPtr pNextProfileHandle =
Marshal.ReadIntPtr(new IntPtr(mProfileListHandle.DangerousGetHandle().ToInt64() + (mNextDeviceProfilePos*IntPtr.Size)));
if (pNextProfileHandle != IntPtr.Zero)
{
mCurrentProfile = new MonoUsbProfileHandle(pNextProfileHandle);
mNextDeviceProfilePos++;
return true;
}
mCurrentProfile = null;
return false;
}
/// <summary>
/// Sets the enumerator to its initial position, which is before the first element in the collection.
/// </summary>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception><filterpriority>2</filterpriority>
public void Reset()
{
mNextDeviceProfilePos = 0;
mCurrentProfile = null;
}
/// <summary>
/// Gets the element in the <see cref="MonoUsbProfileHandle"/> collection at the current position of the enumerator.
/// </summary>
/// <returns>
/// The current <see cref="MonoUsbProfileHandle"/> element.
/// </returns>
public MonoUsbProfileHandle Current
{
get { return mCurrentProfile; }
}
/// <summary>
/// Gets the current element in the <see cref="MonoUsbProfileHandle"/> collection.
/// </summary>
/// <returns>
/// The current <see cref="MonoUsbProfileHandle"/> element.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The enumerator is positioned before the first element of the collection or after the last element.-or- The collection was modified after the enumerator was created.</exception><filterpriority>2</filterpriority>
object IEnumerator.Current
{
get { return Current; }
}
#endregion
}
}
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