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using System;
using System.Globalization;
using System.Runtime.InteropServices;
using LibGit2Sharp.Core;
namespace LibGit2Sharp
{
/// <summary>
/// A Reference to another git object
/// </summary>
public abstract class Reference : IEquatable<Reference>
{
private static readonly LambdaEqualityHelper<Reference> equalityHelper =
new LambdaEqualityHelper<Reference>(new Func<Reference, object>[] { x => x.CanonicalName, x => x.TargetIdentifier });
/// <summary>
/// Gets the full name of this reference.
/// </summary>
public string CanonicalName { get; protected set; }
//TODO: Cries for refactoring... really!
internal static T BuildFromPtr<T>(IntPtr ptr, Repository repo) where T : class
{
if (ptr == IntPtr.Zero)
{
return default(T);
}
string name = NativeMethods.git_reference_name(ptr).MarshallAsString();
GitReferenceType type = NativeMethods.git_reference_type(ptr);
Reference reference;
string targetIdentifier;
switch (type)
{
case GitReferenceType.Symbolic:
IntPtr resolveRef;
targetIdentifier = NativeMethods.git_reference_target(ptr).MarshallAsString();
int res = NativeMethods.git_reference_resolve(out resolveRef, ptr);
if (res == (int)GitErrorCode.GIT_ENOTFOUND)
{
reference = new SymbolicReference { CanonicalName = name, Target = null, TargetIdentifier = targetIdentifier };
break;
}
Ensure.Success(res);
var targetRef = BuildFromPtr<Reference>(resolveRef, repo);
reference = new SymbolicReference { CanonicalName = name, Target = targetRef, TargetIdentifier = targetIdentifier };
break;
case GitReferenceType.Oid:
var oidPtr = NativeMethods.git_reference_oid(ptr);
var oid = (GitOid)Marshal.PtrToStructure(oidPtr, typeof(GitOid));
var targetId = new ObjectId(oid);
targetIdentifier = targetId.Sha;
var targetResolver = new Func<GitObject>(() => repo.Lookup(targetId));
reference = new DirectReference(targetResolver) { CanonicalName = name, TargetIdentifier = targetIdentifier };
break;
default:
throw new InvalidOperationException();
}
if (typeof(Reference).IsAssignableFrom(typeof(T)))
{
return reference as T;
}
GitObject targetGitObject = repo.Lookup(targetIdentifier);
if (Equals(typeof(T), typeof(Tag)))
{
return new Tag(reference.CanonicalName, targetGitObject, targetGitObject as TagAnnotation) as T;
}
if (Equals(typeof(T), typeof(Branch)))
{
return new Branch(reference.CanonicalName, targetGitObject as Commit, repo) as T;
}
throw new InvalidOperationException(
string.Format(CultureInfo.InvariantCulture, "Unable to build a new instance of '{0}' from a reference of type '{1}'.",
typeof(T),
Enum.GetName(typeof(GitReferenceType), type)));
}
/// <summary>
/// Recursively peels the target of the reference until a direct reference is encountered.
/// </summary>
/// <returns>The <see cref="DirectReference"/> this <see cref="Reference"/> points to.</returns>
public abstract DirectReference ResolveToDirectReference();
/// <summary>
/// Gets the target declared by the reference.
/// <para>
/// If this reference is a <see cref="SymbolicReference"/>, returns the canonical name of the target.
/// Otherwise, if this reference is a <see cref="DirectReference"/>, returns the sha of the target.
/// </para>
/// </summary>
public string TargetIdentifier { get; private set; } //TODO: Maybe find a better name for this property.
/// <summary>
/// Determines whether the specified <see cref="Object"/> is equal to the current <see cref="Reference"/>.
/// </summary>
/// <param name="obj">The <see cref="Object"/> to compare with the current <see cref="Reference"/>.</param>
/// <returns>True if the specified <see cref="Object"/> is equal to the current <see cref="Reference"/>; otherwise, false.</returns>
public override bool Equals(object obj)
{
return Equals(obj as Reference);
}
/// <summary>
/// Determines whether the specified <see cref="Reference"/> is equal to the current <see cref="Reference"/>.
/// </summary>
/// <param name="other">The <see cref="Reference"/> to compare with the current <see cref="Reference"/>.</param>
/// <returns>True if the specified <see cref="Reference"/> is equal to the current <see cref="Reference"/>; otherwise, false.</returns>
public bool Equals(Reference other)
{
return equalityHelper.Equals(this, other);
}
/// <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);
}
/// <summary>
/// Tests if two <see cref="Reference"/> are equal.
/// </summary>
/// <param name="left">First <see cref="Reference"/> to compare.</param>
/// <param name="right">Second <see cref="Reference"/> to compare.</param>
/// <returns>True if the two objects are equal; false otherwise.</returns>
public static bool operator ==(Reference left, Reference right)
{
return Equals(left, right);
}
/// <summary>
/// Tests if two <see cref="Reference"/> are different.
/// </summary>
/// <param name="left">First <see cref="Reference"/> to compare.</param>
/// <param name="right">Second <see cref="Reference"/> to compare.</param>
/// <returns>True if the two objects are different; false otherwise.</returns>
public static bool operator !=(Reference left, Reference right)
{
return !Equals(left, right);
}
/// <summary>
/// Returns the <see cref="CanonicalName"/>, a <see cref="String"/> representation of the current <see cref="Reference"/>.
/// </summary>
/// <returns>The <see cref="CanonicalName"/> that represents the current <see cref="Reference"/>.</returns>
public override string ToString()
{
return CanonicalName;
}
}
}
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