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NpgsqlRange.cs
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#region License
// The PostgreSQL License
//
// Copyright (C) 2017 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Text;
using JetBrains.Annotations;
#pragma warning disable 1591
// ReSharper disable once CheckNamespace
namespace NpgsqlTypes
{
public struct NpgsqlRange<T> : IEquatable<NpgsqlRange<T>>
{
#pragma warning disable CA1000
public static NpgsqlRange<T> Empty { get; private set; } = new NpgsqlRange<T>(default(T), default(T), RangeFlags.Empty);
#pragma warning restore CA1000
public T LowerBound { get; }
public T UpperBound { get; }
internal RangeFlags Flags { get; set; }
public bool LowerBoundIsInclusive
{
get { return (Flags & RangeFlags.LowerBoundInclusive) != 0; }
private set
{
if (value)
Flags |= RangeFlags.LowerBoundInclusive;
else
Flags &= ~RangeFlags.LowerBoundInclusive;
}
}
public bool UpperBoundIsInclusive
{
get { return (Flags & RangeFlags.UpperBoundInclusive) != 0; }
private set
{
if (value)
Flags |= RangeFlags.UpperBoundInclusive;
else
Flags &= ~RangeFlags.UpperBoundInclusive;
}
}
public bool LowerBoundInfinite
{
get { return (Flags & RangeFlags.LowerBoundInfinite) != 0; }
private set
{
if (value)
Flags |= RangeFlags.LowerBoundInfinite;
else
Flags &= ~RangeFlags.LowerBoundInfinite;
}
}
public bool UpperBoundInfinite
{
get { return (Flags & RangeFlags.UpperBoundInfinite) != 0; }
private set
{
if (value)
Flags |= RangeFlags.UpperBoundInfinite;
else
Flags &= ~RangeFlags.UpperBoundInfinite;
}
}
public bool IsEmpty => (Flags & RangeFlags.Empty) != 0;
public NpgsqlRange(T lowerBound, T upperBound)
: this(lowerBound, true, false, upperBound, true, false) {}
public NpgsqlRange(T lowerBound, bool lowerBoundIsInclusive, T upperBound, bool upperBoundIsInclusive)
: this(lowerBound, lowerBoundIsInclusive, false, upperBound, upperBoundIsInclusive, false) { }
public NpgsqlRange(T lowerBound, bool lowerBoundIsInclusive, bool lowerBoundInfinite,
T upperBound, bool upperBoundIsInclusive, bool upperBoundInfinite) : this()
{
if (lowerBoundInfinite && lowerBoundIsInclusive)
throw new ArgumentException("Infinite bound can't be inclusive", nameof(lowerBoundIsInclusive));
if (upperBoundInfinite && upperBoundIsInclusive)
throw new ArgumentException("Infinite bound can't be inclusive", nameof(upperBoundIsInclusive));
LowerBound = lowerBound;
UpperBound = upperBound;
LowerBoundIsInclusive = lowerBoundIsInclusive;
UpperBoundIsInclusive = upperBoundIsInclusive;
LowerBoundInfinite = lowerBoundInfinite;
UpperBoundInfinite = upperBoundInfinite;
}
internal NpgsqlRange([CanBeNull] T lowerBound, [CanBeNull] T upperBound, RangeFlags flags) : this()
{
LowerBound = lowerBound;
UpperBound = upperBound;
Flags = flags;
}
public static bool operator ==(NpgsqlRange<T> x, NpgsqlRange<T> y)
=> x.IsEmpty == y.IsEmpty &&
(x.LowerBoundInfinite || y.LowerBoundInfinite || x.LowerBound.Equals(y.LowerBound)) &&
(x.UpperBoundInfinite || y.UpperBoundInfinite || x.UpperBound.Equals(y.UpperBound)) &&
x.LowerBoundIsInclusive == y.LowerBoundIsInclusive &&
x.UpperBoundIsInclusive == y.UpperBoundIsInclusive &&
x.LowerBoundInfinite == y.LowerBoundInfinite &&
x.UpperBoundInfinite == y.UpperBoundInfinite;
public static bool operator !=(NpgsqlRange<T> x, NpgsqlRange<T> y) => !(x == y);
public override bool Equals([CanBeNull] object o) => o is NpgsqlRange<T> && this == (NpgsqlRange<T>)o;
public bool Equals(NpgsqlRange<T> other) => this == other;
public override int GetHashCode()
=> IsEmpty ? 0 :
(LowerBoundInfinite ? 0 : LowerBound.GetHashCode()) +
(UpperBoundInfinite ? 0 : UpperBound.GetHashCode());
public override string ToString()
{
if (IsEmpty)
return "empty";
var sb = new StringBuilder();
if (LowerBoundInfinite)
sb.Append('(');
else
{
sb.Append(LowerBoundIsInclusive ? '[' : '(');
sb.Append(LowerBound);
}
sb.Append(',');
if (UpperBoundInfinite)
sb.Append(')');
else {
sb.Append(UpperBound);
sb.Append(UpperBoundIsInclusive ? ']' : ')');
}
return sb.ToString();
}
}
[Flags]
enum RangeFlags : byte
{
Empty = 1,
LowerBoundInclusive = 2,
UpperBoundInclusive = 4,
LowerBoundInfinite = 8,
UpperBoundInfinite = 16
}
}