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using System;
namespace LibGit2Sharp.Core
{
internal class LambdaEqualityHelper<T>
{
private readonly Func<T, object>[] equalityContributorAccessors;
public LambdaEqualityHelper(params Func<T, object>[] equalityContributorAccessors)
{
this.equalityContributorAccessors = equalityContributorAccessors;
}
public bool Equals(T instance, T other)
{
if (ReferenceEquals(null, instance) || ReferenceEquals(null, other))
{
return false;
}
if (ReferenceEquals(instance, other))
{
return true;
}
if (instance.GetType() != other.GetType())
{
return false;
}
foreach (Func<T, object> accessor in equalityContributorAccessors)
{
if (!Equals(accessor(instance), accessor(other)))
{
return false;
}
}
return true;
}
public int GetHashCode(T instance)
{
int hashCode = GetType().GetHashCode();
unchecked
{
foreach (Func<T, object> accessor in equalityContributorAccessors)
{
object item = accessor(instance);
hashCode = (hashCode*397) ^ (item != null ? item.GetHashCode() : 0);
}
}
return hashCode;
}
}
}
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