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using System;
using System.Runtime.InteropServices;
using LibGit2Sharp.Core;
using LibGit2Sharp.Core.Compat;
using LibGit2Sharp.Core.Handles;
namespace LibGit2Sharp
{
/// <summary>
/// Representation of an entry in a <see cref = "Tree" />.
/// </summary>
public class TreeEntry : IEquatable<TreeEntry>
{
private readonly ObjectId parentTreeId;
private readonly Repository repo;
private readonly Lazy<GitObject> target;
private readonly ObjectId targetOid;
private readonly Lazy<string> path;
private static readonly LambdaEqualityHelper<TreeEntry> equalityHelper =
new LambdaEqualityHelper<TreeEntry>(new Func<TreeEntry, object>[] { x => x.Name, x => x.parentTreeId });
internal TreeEntry(TreeEntrySafeHandle obj, ObjectId parentTreeId, Repository repo, FilePath parentPath)
{
this.parentTreeId = parentTreeId;
this.repo = repo;
targetOid = NativeMethods.git_tree_entry_id(obj).MarshalAsObjectId();
Type = NativeMethods.git_tree_entry_type(obj);
target = new Lazy<GitObject>(RetrieveTreeEntryTarget);
Attributes = (int)NativeMethods.git_tree_entry_attributes(obj);
Name = NativeMethods.git_tree_entry_name(obj);
path = new Lazy<string>(() => System.IO.Path.Combine(parentPath.Native, Name));
}
/// <summary>
/// Gets the UNIX file attributes.
/// </summary>
public int Attributes { get; private set; }
/// <summary>
/// Gets the filename.
/// </summary>
public string Name { get; private set; }
/// <summary>
/// Gets the path.
/// <para>The path is expressed in a relative form from the latest known <see cref="Tree"/>. Path segments are separated with a forward or backslash, depending on the OS the libray is being run on."/></para>
/// </summary>
public string Path { get { return path.Value; } }
/// <summary>
/// Gets the <see cref = "GitObject" /> being pointed at.
/// </summary>
public GitObject Target
{
get { return target.Value; }
}
/// <summary>
/// Gets the <see cref = "GitObjectType" /> of the <see cref = "Target" /> being pointed at.
/// </summary>
public GitObjectType Type { get; private set; }
private GitObject RetrieveTreeEntryTarget()
{
if (!Type.HasAny(new[]{GitObjectType.Tree, GitObjectType.Blob}))
{
throw new InvalidOperationException(string.Format("TreeEntry target of type '{0}' are not supported.", Type));
}
GitObject treeEntryTarget = repo.LookupTreeEntryTarget(targetOid, Path);
return treeEntryTarget;
}
/// <summary>
/// Determines whether the specified <see cref = "Object" /> is equal to the current <see cref = "TreeEntry" />.
/// </summary>
/// <param name = "obj">The <see cref = "Object" /> to compare with the current <see cref = "TreeEntry" />.</param>
/// <returns>True if the specified <see cref = "Object" /> is equal to the current <see cref = "TreeEntry" />; otherwise, false.</returns>
public override bool Equals(object obj)
{
return Equals(obj as TreeEntry);
}
/// <summary>
/// Determines whether the specified <see cref = "TreeEntry" /> is equal to the current <see cref = "TreeEntry" />.
/// </summary>
/// <param name = "other">The <see cref = "TreeEntry" /> to compare with the current <see cref = "TreeEntry" />.</param>
/// <returns>True if the specified <see cref = "TreeEntry" /> is equal to the current <see cref = "TreeEntry" />; otherwise, false.</returns>
public bool Equals(TreeEntry 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 = "TreeEntry" /> are equal.
/// </summary>
/// <param name = "left">First <see cref = "TreeEntry" /> to compare.</param>
/// <param name = "right">Second <see cref = "TreeEntry" /> to compare.</param>
/// <returns>True if the two objects are equal; false otherwise.</returns>
public static bool operator ==(TreeEntry left, TreeEntry right)
{
return Equals(left, right);
}
/// <summary>
/// Tests if two <see cref = "TreeEntry" /> are different.
/// </summary>
/// <param name = "left">First <see cref = "TreeEntry" /> to compare.</param>
/// <param name = "right">Second <see cref = "TreeEntry" /> to compare.</param>
/// <returns>True if the two objects are different; false otherwise.</returns>
public static bool operator !=(TreeEntry left, TreeEntry right)
{
return !Equals(left, right);
}
}
}
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