using System;

namespace SharpDX

{

/// <summary>

/// Base class for a <see cref="IDisposable"/> class.

/// </summary>

public abstract class DisposeBase : IDisposable

{

/// <summary>

/// Occurs when this instance is starting to be disposed.

/// </summary>

public event EventHandler<EventArgs> Disposing;

/// <summary>

/// Occurs when this instance is fully disposed.

/// </summary>

public event EventHandler<EventArgs> Disposed;

/// <summary>

/// Releases unmanaged resources and performs other cleanup operations before the

/// <see cref="DisposeBase"/> is reclaimed by garbage collection.

/// </summary>

~DisposeBase()

{

// Finalizer calls Dispose(false)

CheckAndDispose(false);

}

/// <summary>

/// Gets a value indicating whether this instance is disposed.

/// </summary>

/// <value>

/// <c>true</c> if this instance is disposed; otherwise, <c>false</c>.

/// </value>

public bool IsDisposed { get; private set; }

/// <summary>

/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

/// </summary>

public void Dispose()

{

CheckAndDispose(true);

}

/// <summary>

/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

/// </summary>

private void CheckAndDispose(bool disposing)

{

// TODO Should we throw an exception if this method is called more than once?

if (!IsDisposed)

{

EventHandler<EventArgs> disposingHandlers = Disposing;

if (disposingHandlers != null)

disposingHandlers(this, EventArgs.Empty);

Dispose(disposing);

GC.SuppressFinalize(this);

IsDisposed = true;

EventHandler<EventArgs> disposedHandlers = Disposed;

if (disposedHandlers != null)

disposedHandlers(this, EventArgs.Empty);

}

}

/// <summary>

/// Releases unmanaged and - optionally - managed resources

/// </summary>

/// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>

protected abstract void Dispose(bool disposing);

}

}