private static string ToString(ICut <T> lowerBound, ICut <T> upperBound)
{
var builder = new StringBuilder(32);
lowerBound.DescribeAsLowerBound(builder);
builder.Append("..");
upperBound.DescribeAsUpperBound(builder);
return(builder.ToString());
}
public static int EndpointAsLowerClosed(this ICut <int> lower)
{
if (lower == BelowAll <int> .INSTANCE)
{
return(int.MinValue);
}
switch (lower.TypeAsLowerBound)
{
case BoundType.CLOSED: return(lower.Endpoint);
case BoundType.OPEN: return(lower.Endpoint + 1);
default: throw new InvalidOperationException();
}
}
public static long EndpointAsUpperClosed(this ICut <long> upper)
{
if (upper == AboveAll <long> .INSTANCE)
{
return(long.MaxValue);
}
switch (upper.TypeAsUpperBound)
{
case BoundType.CLOSED: return(upper.Endpoint);
case BoundType.OPEN: return(upper.Endpoint - 1);
default: throw new InvalidOperationException();
}
}
private Range(ICut <T> lowerBound, ICut <T> upperBound)
{
if (lowerBound == null)
{
throw new ArgumentNullException(nameof(lowerBound));
}
if (upperBound == null)
{
throw new ArgumentNullException(nameof(upperBound));
}
if (lowerBound.CompareTo(upperBound) > 0 ||
lowerBound == AboveAll <T> .INSTANCE ||
upperBound == BelowAll <T> .INSTANCE)
{
throw new InvalidOperationException("Invalid range: " + ToString(lowerBound, upperBound));
}
_lowerBound = lowerBound ?? throw new ArgumentNullException(nameof(lowerBound));
_upperBound = upperBound ?? throw new ArgumentNullException(nameof(upperBound));
}
public virtual int CompareTo(ICut <T> other)
{
if (other == BelowAll <T> .INSTANCE)
{
return(1);
}
if (other == AboveAll <T> .INSTANCE)
{
return(-1);
}
var result = Endpoint.CompareTo(other.Endpoint);
if (result != 0)
{
return(result);
}
var thisIsAboveValue = this as AboveValue <T> != null;
var otherIsAboveValue = other as AboveValue <T> != null;
return(thisIsAboveValue.CompareTo(otherIsAboveValue));
}
internal static Range <T> Create(ICut <T> lowerBound, ICut <T> upperBound)
{
return(new Range <T>(lowerBound, upperBound));
}
public override int CompareTo(ICut <T> other)
{
return(other == this ? 0 : -1);
}
public bool Equals(ICut <T> other)
{
return(CompareTo(other) == 0);
}