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using System;
using LibGit2Sharp.Core;
using LibGit2Sharp.Handlers;
namespace LibGit2Sharp
{
/// <summary>
/// Class to handle the mapping between libgit2 progress_cb callback on the git_checkout_opts
/// structure to the CheckoutProgressHandler delegate.
/// </summary>
internal class CheckoutCallbacks
{
/// <summary>
/// Managed delegate to call in response to checkout progress_cb callback.
/// </summary>
private readonly CheckoutProgressHandler onCheckoutProgress;
/// <summary>
/// Constructor to set up native callback for given managed delegate.
/// </summary>
/// <param name="onCheckoutProgress"><see cref="CheckoutProgressHandler"/> delegate to call in response to checkout progress_cb</param>
private CheckoutCallbacks(CheckoutProgressHandler onCheckoutProgress)
{
this.onCheckoutProgress = onCheckoutProgress;
}
/// <summary>
/// Generate a delegate matching the signature of the native progress_cb callback and wraps the <see cref="CheckoutProgressHandler"/> delegate.
/// </summary>
/// <param name="onCheckoutProgress"><see cref="CheckoutProgressHandler"/> that should be wrapped in the native callback.</param>
/// <returns>The delegate with signature matching the expected native callback. </returns>
internal static progress_cb GenerateCheckoutCallbacks(CheckoutProgressHandler onCheckoutProgress)
{
if (onCheckoutProgress == null)
{
return null;
}
return new CheckoutCallbacks(onCheckoutProgress).OnGitCheckoutProgress;
}
/// <summary>
/// The delegate with a signature that matches the native checkout progress_cb function's signature.
/// </summary>
/// <param name="str">The path that was updated.</param>
/// <param name="completedSteps">The number of completed steps.</param>
/// <param name="totalSteps">The total number of steps.</param>
/// <param name="payload">Payload object.</param>
private void OnGitCheckoutProgress(IntPtr str, UIntPtr completedSteps, UIntPtr totalSteps, IntPtr payload)
{
// Convert null strings into empty strings.
string path = (str != IntPtr.Zero) ? Utf8Marshaler.FromNative(str) : string.Empty;
onCheckoutProgress(path, (int)completedSteps, (int)totalSteps);
}
}
}
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