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using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using LibGit2Sharp.Core;
using LibGit2Sharp.Core.Handles;
namespace LibGit2Sharp
{
/// <summary>
/// The <see cref="ReflogCollection"/> is the reflog of a given <see cref="Reference"/>, as a enumerable of <see cref="ReflogEntry"/>.
/// Reflog is a mechanism to record when the tip of a <see cref="Branch"/> is updated.
/// </summary>
[DebuggerDisplay("{DebuggerDisplay,nq}")]
public class ReflogCollection : IEnumerable<ReflogEntry>
{
internal readonly Repository repo;
private readonly string canonicalName;
/// <summary>
/// Needed for mocking purposes.
/// </summary>
protected ReflogCollection()
{ }
/// <summary>
/// Initializes a new instance of the <see cref="ReflogCollection"/> class.
/// </summary>
/// <param name="repo">The repo.</param>
/// <param name="canonicalName">the canonical name of the <see cref="Reference"/> to retrieve reflog entries on.</param>
internal ReflogCollection(Repository repo, string canonicalName)
{
Ensure.ArgumentNotNullOrEmptyString(canonicalName, "canonicalName");
Ensure.ArgumentNotNull(repo, "repo");
if (!Reference.IsValidName(canonicalName))
{
throw new InvalidSpecificationException(
string.Format(CultureInfo.InvariantCulture, "The given reference name '{0}' is not valid", canonicalName));
}
this.repo = repo;
this.canonicalName = canonicalName;
}
#region Implementation of IEnumerable
/// <summary>
/// Returns an enumerator that iterates through the collection.
/// <para>
/// The enumerator returns the <see cref="ReflogEntry"/> by descending order (last reflog entry is returned first).
/// </para>
/// </summary>
/// <returns>An <see cref="IEnumerator{T}"/> object that can be used to iterate through the collection.</returns>
public virtual IEnumerator<ReflogEntry> GetEnumerator()
{
var entries = new List<ReflogEntry>();
using (ReflogSafeHandle reflog = Proxy.git_reflog_read(repo.Handle, canonicalName))
{
var entriesCount = Proxy.git_reflog_entrycount(reflog);
for (int i = 0; i < entriesCount; i++)
{
ReflogEntrySafeHandle handle = Proxy.git_reflog_entry_byindex(reflog, i);
entries.Add(new ReflogEntry(handle));
}
}
return entries.GetEnumerator();
}
/// <summary>
/// Returns an enumerator that iterates through the collection.
/// </summary>
/// <returns>An <see cref="IEnumerator"/> object that can be used to iterate through the collection.</returns>
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
#endregion
private string DebuggerDisplay
{
get
{
return string.Format(CultureInfo.InvariantCulture,
"Count = {0}", this.Count());
}
}
}
}
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