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using System;
using LibGit2Sharp.Core;
namespace LibGit2Sharp
{
/// <summary>
/// Holds the meta data of a <see cref="TreeEntry"/>.
/// </summary>
public class TreeEntryDefinition : IEquatable<TreeEntryDefinition>
{
private Lazy<GitObject> target;
private static readonly LambdaEqualityHelper<TreeEntryDefinition> equalityHelper =
new LambdaEqualityHelper<TreeEntryDefinition>(x => x.Mode, x => x.TargetType, x => x.TargetId);
internal static readonly Enum[] BlobModes = new Enum[] { Mode.NonExecutableFile, Mode.ExecutableFile, Mode.NonExecutableGroupWritableFile, Mode.SymbolicLink };
/// <summary>
/// Needed for mocking purposes.
/// </summary>
protected TreeEntryDefinition()
{
}
/// <summary>
/// Gets file mode.
/// </summary>
public virtual Mode Mode { get; private set; }
/// <summary>
/// Gets the <see cref="TreeEntryTargetType"/> of the target being pointed at.
/// </summary>
public virtual TreeEntryTargetType TargetType { get; private set; }
/// <summary>
/// Gets the <see cref="ObjectId"/> of the target being pointed at.
/// </summary>
public virtual ObjectId TargetId { get; private set; }
internal virtual GitObject Target
{
get { return target.Value; }
}
internal static TreeEntryDefinition From(TreeEntry treeEntry)
{
return new TreeEntryDefinition
{
Mode = treeEntry.Mode,
TargetType = treeEntry.TargetType,
TargetId = treeEntry.TargetId,
target = new Lazy<GitObject>(() => treeEntry.Target)
};
}
internal static TreeEntryDefinition From(Blob blob, Mode mode)
{
return new TreeEntryDefinition
{
Mode = mode,
TargetType = TreeEntryTargetType.Blob,
TargetId = blob.Id,
target = new Lazy<GitObject>(() => blob)
};
}
internal static TreeEntryDefinition TransientBlobFrom(string filePath, Mode mode)
{
Ensure.ArgumentConformsTo(mode, m => m.HasAny(BlobModes), "mode");
return new TransientBlobTreeEntryDefinition
{
Builder = odb => odb.CreateBlob(filePath),
Mode = mode,
};
}
internal static TreeEntryDefinition From(ObjectId objectId)
{
return new TreeEntryDefinition
{
Mode = Mode.GitLink,
TargetType = TreeEntryTargetType.GitLink,
TargetId = objectId,
target = new Lazy<GitObject>(() => { throw new InvalidOperationException("Shouldn't be necessary."); }),
};
}
internal static TreeEntryDefinition From(Tree tree)
{
return new TreeEntryDefinition
{
Mode = Mode.Directory,
TargetType = TreeEntryTargetType.Tree,
TargetId = tree.Id,
target = new Lazy<GitObject>(() => tree)
};
}
/// <summary>
/// Determines whether the specified <see cref="Object"/> is equal to the current <see cref="TreeEntryDefinition"/>.
/// </summary>
/// <param name="obj">The <see cref="Object"/> to compare with the current <see cref="TreeEntryDefinition"/>.</param>
/// <returns>True if the specified <see cref="Object"/> is equal to the current <see cref="TreeEntryDefinition"/>; otherwise, false.</returns>
public override bool Equals(object obj)
{
return Equals(obj as TreeEntryDefinition);
}
/// <summary>
/// Determines whether the specified <see cref="TreeEntryDefinition"/> is equal to the current <see cref="TreeEntryDefinition"/>.
/// </summary>
/// <param name="other">The <see cref="TreeEntryDefinition"/> to compare with the current <see cref="TreeEntryDefinition"/>.</param>
/// <returns>True if the specified <see cref="TreeEntryDefinition"/> is equal to the current <see cref="TreeEntryDefinition"/>; otherwise, false.</returns>
public bool Equals(TreeEntryDefinition 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="TreeEntryDefinition"/> are equal.
/// </summary>
/// <param name="left">First <see cref="TreeEntryDefinition"/> to compare.</param>
/// <param name="right">Second <see cref="TreeEntryDefinition"/> to compare.</param>
/// <returns>True if the two objects are equal; false otherwise.</returns>
public static bool operator ==(TreeEntryDefinition left, TreeEntryDefinition right)
{
return Equals(left, right);
}
/// <summary>
/// Tests if two <see cref="TreeEntryDefinition"/> are different.
/// </summary>
/// <param name="left">First <see cref="TreeEntryDefinition"/> to compare.</param>
/// <param name="right">Second <see cref="TreeEntryDefinition"/> to compare.</param>
/// <returns>True if the two objects are different; false otherwise.</returns>
public static bool operator !=(TreeEntryDefinition left, TreeEntryDefinition right)
{
return !Equals(left, right);
}
}
internal abstract class TransientTreeEntryDefinition : TreeEntryDefinition
{
public override ObjectId TargetId
{
get { return ObjectId.Zero; }
}
internal override GitObject Target
{
get { return null; }
}
}
internal class TransientTreeTreeEntryDefinition : TransientTreeEntryDefinition
{
public override Mode Mode
{
get { return Mode.Directory; }
}
public override TreeEntryTargetType TargetType
{
get { return TreeEntryTargetType.Tree; }
}
}
internal class TransientBlobTreeEntryDefinition : TransientTreeEntryDefinition
{
public override TreeEntryTargetType TargetType
{
get { return TreeEntryTargetType.Blob; }
}
public Func<ObjectDatabase, Blob> Builder { get; set; }
}
}
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