c# similarity help
<p>Anyone can explain these codes for me?</p>

<pre><code>public class SimilarityImages : IComparer&lt;SimilarityImages&gt;, IComparable
{
    private readonly ComparableImage source;
    private readonly ComparableImage destination;
    private readonly double similarity;

    public SimilarityImages(ComparableImage source, ComparableImage destination, double similarity)
    {
        this.source = source;
        this.destination = destination;
        this.similarity = similarity;
    }

    public ComparableImage Source
    {
        get
        {
            return source;
        }
    }

    public ComparableImage Destination
    {
        get
        {
            return destination;
        }
    }

    public double Similarity
    {
        get
        {
            return Math.Round(similarity * 100, 1);
        }
    }

    public static int operator !=(SimilarityImages value, SimilarityImages compare)
    {
        return value.CompareTo(compare);
    }

    public static int operator &lt;(SimilarityImages value, SimilarityImages compare)
    {
        return value.CompareTo(compare);
    }

    public static int operator ==(SimilarityImages value, SimilarityImages compare)
    {
        return value.CompareTo(compare);
    }

    public static int operator &gt;(SimilarityImages value, SimilarityImages compare)
    {
        return value.CompareTo(compare);
    }

    public override string ToString()
    {
        return string.Format("{0}, {1} --&gt; {2}", source.File.Name, destination.File.Name, similarity);
    }

    #region IComparer&lt;SimilarityImages&gt; Members

    public int Compare(SimilarityImages x, SimilarityImages y)
    {
        return x.similarity.CompareTo(y.similarity);
    }

    #endregion

    #region IComparable Members

    public int CompareTo(object obj)
    {
        SimilarityImages other = (SimilarityImages)obj;
        return this.Compare(this, other);
    }

    #endregion

    public override bool Equals(object obj)
    {
        if (obj == null || GetType() != obj.GetType())
        {
            return false;
        }

        var other = (SimilarityImages)obj;

        var equals = Source.File.FullName.Equals(other.Source.File.FullName, StringComparison.InvariantCultureIgnoreCase);

        if (!equals)
        {
            return false;
        }

        equals = Destination.File.FullName.Equals(other.Destination.File.FullName, StringComparison.InvariantCultureIgnoreCase);

        if (!equals)
        {
            return false;
        }

        return true;
    }

    public override int GetHashCode()
    {
        return string.Format("{0};{1}", Source.File.FullName, Destination.File.FullName).GetHashCode();
    }
}
</code></pre>
