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//
// IConsole.cs
//
// Author:
// Lluis Sanchez Gual
//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// 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.IO;
using System.Threading;
namespace MonoDevelop.Core.Execution
{
/// <summary>
/// A console where an operation can use to write output or read input
/// </summary>
public abstract class OperationConsole: IDisposable
{
IDisposable cancelReg;
/// <summary>
/// Input stream
/// </summary>
public abstract TextReader In { get; }
/// <summary>
/// Output stream
/// </summary>
public abstract TextWriter Out { get; }
/// <summary>
/// Error stream
/// </summary>
public abstract TextWriter Error { get; }
/// <summary>
/// Log stream
/// </summary>
public abstract TextWriter Log { get; }
/// <summary>
/// Writes debug information to the console
/// </summary>
public virtual void Debug (int level, string category, string message)
{
if (level == 0 && string.IsNullOrEmpty (category)) {
Log.Write (message);
} else {
Log.Write (string.Format ("[{0}:{1}] {2}", level, category, message));
}
}
/// <summary>
/// Gets the cancelation token to be used to cancel the operation that is using the console
/// </summary>
public CancellationToken CancellationToken {
get { return CancellationSource.Token; }
}
protected CancellationTokenSource CancellationSource { get; set; }
protected OperationConsole ()
{
CancellationSource = new CancellationTokenSource ();
}
protected OperationConsole (CancellationToken cancelToken): this ()
{
BindToCancelToken (cancelToken);
}
internal protected void BindToCancelToken (CancellationToken cancelToken)
{
cancelReg = cancelToken.Register (CancellationSource.Cancel);
}
/// <summary>
/// Returns a console that wraps this console, but it overrides the cancel
/// operation, so instead of signaling the cancel token, it executes
/// the provided action.
/// </summary>
public OperationConsole WithCancelCallback (Action cancelAction)
{
return new OperationConsoleWrapper (this, cancelAction);
}
public virtual void Dispose ()
{
if (cancelReg != null)
cancelReg.Dispose ();
}
}
class OperationConsoleWrapper : OperationConsole
{
OperationConsole console;
Action cancelAction;
public OperationConsoleWrapper (OperationConsole console, Action cancelAction)
{
this.console = console;
this.cancelAction = cancelAction;
console.CancellationToken.Register (cancelAction);
}
public override TextWriter Error {
get {
return console.Error;
}
}
public override TextReader In {
get {
return console.In;
}
}
public override TextWriter Log {
get {
return console.Log;
}
}
public override TextWriter Out {
get {
return console.Out;
}
}
public override void Dispose ()
{
base.Dispose ();
console.Dispose ();
}
}
}
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