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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using LibGit2Sharp.Core;
using LibGit2Sharp.Core.Handles;
namespace LibGit2Sharp
{
/// <summary>
/// A GitObject
/// </summary>
[DebuggerDisplay("{DebuggerDisplay,nq}")]
public abstract class GitObject : IEquatable<GitObject>
{
internal static IDictionary<Type, ObjectType> TypeToKindMap =
new Dictionary<Type, ObjectType>
{
{ typeof(Commit), ObjectType.Commit },
{ typeof(Tree), ObjectType.Tree },
{ typeof(Blob), ObjectType.Blob },
{ typeof(TagAnnotation), ObjectType.Tag },
};
private static readonly LambdaEqualityHelper<GitObject> equalityHelper =
new LambdaEqualityHelper<GitObject>(x => x.Id);
/// <summary>
/// The <see cref = "Repository" /> containing the object.
/// </summary>
protected readonly Repository repo;
/// <summary>
/// Needed for mocking purposes.
/// </summary>
protected GitObject()
{ }
/// <summary>
/// Initializes a new instance of the <see cref = "GitObject" /> class.
/// </summary>
/// <param name = "repo">The <see cref = "Repository" /> containing the object.</param>
/// <param name = "id">The <see cref = "ObjectId" /> it should be identified by.</param>
protected GitObject(Repository repo, ObjectId id)
{
this.repo = repo;
Id = id;
}
/// <summary>
/// Gets the id of this object
/// </summary>
public virtual ObjectId Id { get; private set; }
/// <summary>
/// Gets the 40 character sha1 of this object.
/// </summary>
public virtual string Sha
{
get { return Id.Sha; }
}
internal static GitObject BuildFrom(Repository repo, ObjectId id, GitObjectType type, FilePath path)
{
switch (type)
{
case GitObjectType.Commit:
return new Commit(repo, id);
case GitObjectType.Tree:
return new Tree(repo, id, path);
case GitObjectType.Tag:
return new TagAnnotation(repo, id);
case GitObjectType.Blob:
return new Blob(repo, id);
default:
throw new LibGit2SharpException(string.Format(CultureInfo.InvariantCulture, "Unexpected type '{0}' for object '{1}'.", type, id));
}
}
internal Commit DereferenceToCommit(bool throwsIfCanNotBeDereferencedToACommit)
{
using (GitObjectSafeHandle peeledHandle = Proxy.git_object_peel(repo.Handle, Id, GitObjectType.Commit, throwsIfCanNotBeDereferencedToACommit))
{
if (peeledHandle == null)
{
return null;
}
return (Commit)BuildFrom(repo, Proxy.git_object_id(peeledHandle), GitObjectType.Commit, null);
}
}
/// <summary>
/// Determines whether the specified <see cref = "Object" /> is equal to the current <see cref = "GitObject" />.
/// </summary>
/// <param name = "obj">The <see cref = "Object" /> to compare with the current <see cref = "GitObject" />.</param>
/// <returns>True if the specified <see cref = "Object" /> is equal to the current <see cref = "GitObject" />; otherwise, false.</returns>
public override bool Equals(object obj)
{
return Equals(obj as GitObject);
}
/// <summary>
/// Determines whether the specified <see cref = "GitObject" /> is equal to the current <see cref = "GitObject" />.
/// </summary>
/// <param name = "other">The <see cref = "GitObject" /> to compare with the current <see cref = "GitObject" />.</param>
/// <returns>True if the specified <see cref = "GitObject" /> is equal to the current <see cref = "GitObject" />; otherwise, false.</returns>
public bool Equals(GitObject 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 = "GitObject" /> are equal.
/// </summary>
/// <param name = "left">First <see cref = "GitObject" /> to compare.</param>
/// <param name = "right">Second <see cref = "GitObject" /> to compare.</param>
/// <returns>True if the two objects are equal; false otherwise.</returns>
public static bool operator ==(GitObject left, GitObject right)
{
return Equals(left, right);
}
/// <summary>
/// Tests if two <see cref = "GitObject" /> are different.
/// </summary>
/// <param name = "left">First <see cref = "GitObject" /> to compare.</param>
/// <param name = "right">Second <see cref = "GitObject" /> to compare.</param>
/// <returns>True if the two objects are different; false otherwise.</returns>
public static bool operator !=(GitObject left, GitObject right)
{
return !Equals(left, right);
}
/// <summary>
/// Returns the <see cref = "Id" />, a <see cref = "String" /> representation of the current <see cref = "GitObject" />.
/// </summary>
/// <returns>The <see cref = "Id" /> that represents the current <see cref = "GitObject" />.</returns>
public override string ToString()
{
return Id.ToString();
}
private string DebuggerDisplay
{
get { return Id.ToString(7); }
}
}
}
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