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using System;
using System.Globalization;
using LibGit2Sharp.Core;
namespace LibGit2Sharp
{
/// <summary>
/// A branch is a special kind of reference
/// </summary>
public class Branch : IEquatable<Branch>
{
private static readonly LambdaEqualityHelper<Branch> equalityHelper =
new LambdaEqualityHelper<Branch>(new Func<Branch, object>[] {x => x.CanonicalName, x => x.Tip});
private readonly Repository repo;
/// <summary>
/// Initializes a new instance of the <see cref = "Branch" /> class.
/// </summary>
/// <param name = "tip">The commit which is pointed at by this Branch</param>
/// <param name = "repo">The repo.</param>
/// <param name = "canonicalName">The full name of the reference</param>
internal Branch(string canonicalName, Commit tip, Repository repo)
{
this.repo = repo;
CanonicalName = canonicalName;
Tip = tip;
}
/// <summary>
/// Gets the full name of this branch.
/// </summary>
public string CanonicalName { get; private set; }
/// <summary>
/// Gets the name of this branch.
/// </summary>
public string Name
{
get { return ShortenName(CanonicalName); }
}
/// <summary>
/// Gets a value indicating whether this instance is a remote.
/// </summary>
/// <value>
/// <c>true</c> if this instance is remote; otherwise, <c>false</c>.
/// </value>
public bool IsRemote
{
get { return IsRemoteBranch(CanonicalName); }
}
/// <summary>
/// Gets a value indicating whether this instance is current branch (HEAD) in the repository.
/// </summary>
/// <value>
/// <c>true</c> if this instance is current branch; otherwise, <c>false</c>.
/// </value>
public bool IsCurrentRepositoryHead
{
get { return repo.Refs[CanonicalName].ResolveToDirectReference() == repo.Refs["HEAD"].ResolveToDirectReference(); }
}
/// <summary>
/// Gets the commit id that this branch points to.
/// </summary>
public Commit Tip { get; private set; }
/// <summary>
/// Gets the commits on this branch. (Starts walking from the References's target).
/// </summary>
public ICommitCollection Commits
{
get { return repo.Commits.QueryBy(new Filter{Since = this}); }
}
#region IEquatable<Branch> Members
/// <summary>
/// Determines whether the specified <see cref = "Branch" /> is equal to the current <see cref = "Branch" />.
/// </summary>
/// <param name = "other">The <see cref = "Branch" /> to compare with the current <see cref = "Branch" />.</param>
/// <returns>True if the specified <see cref = "Branch" /> is equal to the current <see cref = "Branch" />; otherwise, false.</returns>
public bool Equals(Branch other)
{
return equalityHelper.Equals(this, other);
}
#endregion
/// <summary>
/// Determines whether the specified <see cref = "Object" /> is equal to the current <see cref = "Branch" />.
/// </summary>
/// <param name = "obj">The <see cref = "Object" /> to compare with the current <see cref = "Branch" />.</param>
/// <returns>True if the specified <see cref = "Object" /> is equal to the current <see cref = "Branch" />; otherwise, false.</returns>
public override bool Equals(object obj)
{
return Equals(obj as Branch);
}
/// <summary>
/// Returns the hash code for this instance.
/// </summary>
/// <returns>A 32-bit signed integer hash code.</returns>
public override int GetHashCode()
{
return equalityHelper.GetHashCode(this);
}
private static bool IsRemoteBranch(string canonicalName)
{
return canonicalName.StartsWith("refs/remotes/", StringComparison.Ordinal);
}
private static string ShortenName(string branchName)
{
if (branchName.StartsWith("refs/heads/", StringComparison.Ordinal))
{
return branchName.Substring("refs/heads/".Length);
}
if (branchName.StartsWith("refs/remotes/", StringComparison.Ordinal))
{
return branchName.Substring("refs/remotes/".Length);
}
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture,"'{0}' does not look like a valid branch name.", branchName));
}
/// <summary>
/// Tests if two <see cref = "Branch" /> are equal.
/// </summary>
/// <param name = "left">First <see cref = "Branch" /> to compare.</param>
/// <param name = "right">Second <see cref = "Branch" /> to compare.</param>
/// <returns>True if the two objects are equal; false otherwise.</returns>
public static bool operator ==(Branch left, Branch right)
{
return Equals(left, right);
}
/// <summary>
/// Tests if two <see cref = "Branch" /> are different.
/// </summary>
/// <param name = "left">First <see cref = "Branch" /> to compare.</param>
/// <param name = "right">Second <see cref = "Branch" /> to compare.</param>
/// <returns>True if the two objects are different; false otherwise.</returns>
public static bool operator !=(Branch left, Branch right)
{
return !Equals(left, right);
}
/// <summary>
/// Returns the <see cref="CanonicalName"/>, a <see cref="String"/> representation of the current <see cref="Branch"/>.
/// </summary>
/// <returns>The <see cref="CanonicalName"/> that represents the current <see cref="Branch"/>.</returns>
public override string ToString()
{
return CanonicalName;
}
}
}
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