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NpgsqlRange.cs
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#region License
// The PostgreSQL License
//
// Copyright (C) 2015 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.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
#pragma warning disable 1591
namespace NpgsqlTypes
{
public struct NpgsqlRange<T>
{
public static NpgsqlRange<T> Empty()
{
return new NpgsqlRange<T>(RangeFlags.Empty);
}
public T LowerBound { get; set; }
public T UpperBound { get; set; }
internal RangeFlags Flags { get; set; }
public bool LowerBoundIsInclusive
{
get { return (Flags & RangeFlags.LowerBoundInclusive) != 0; }
set
{
if (value)
Flags |= RangeFlags.LowerBoundInclusive;
else
Flags &= ~RangeFlags.LowerBoundInclusive;
}
}
public bool UpperBoundIsInclusive
{
get { return (Flags & RangeFlags.UpperBoundInclusive) != 0; }
set
{
if (value)
Flags |= RangeFlags.UpperBoundInclusive;
else
Flags &= ~RangeFlags.UpperBoundInclusive;
}
}
public bool LowerBoundInfinite
{
get { return (Flags & RangeFlags.LowerBoundInfinite) != 0; }
set
{
if (value)
Flags |= RangeFlags.LowerBoundInfinite;
else
Flags &= ~RangeFlags.LowerBoundInfinite;
}
}
public bool UpperBoundInfinite
{
get { return (Flags & RangeFlags.UpperBoundInfinite) != 0; }
set
{
if (value)
Flags |= RangeFlags.UpperBoundInfinite;
else
Flags &= ~RangeFlags.UpperBoundInfinite;
}
}
public bool IsEmpty
{
get { return (Flags & RangeFlags.Empty) != 0; }
set
{
if (value)
Flags |= RangeFlags.Empty;
else
Flags &= ~RangeFlags.Empty;
}
}
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", "lowerBoundIsInclusive");
if (upperBoundInfinite && upperBoundIsInclusive)
throw new ArgumentException("Infinite bound can't be inclusive", "upperBoundIsInclusive");
Contract.EndContractBlock();
LowerBound = lowerBound;
UpperBound = upperBound;
LowerBoundIsInclusive = lowerBoundIsInclusive;
UpperBoundIsInclusive = upperBoundIsInclusive;
LowerBoundInfinite = lowerBoundInfinite;
UpperBoundInfinite = upperBoundInfinite;
}
internal NpgsqlRange(RangeFlags flags) : this()
{
Flags = flags;
}
public static bool operator ==(NpgsqlRange<T> x, NpgsqlRange<T> y)
{
return
x.IsEmpty == y.IsEmpty &&
x.LowerBound.Equals(y.LowerBound) &&
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)
{
return !(x == y);
}
public override bool Equals(object obj)
{
return obj is NpgsqlRange<T> && this == (NpgsqlRange<T>)obj;
}
public override int GetHashCode()
{
return 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]
internal enum RangeFlags : byte
{
Empty = 1,
LowerBoundInclusive = 2,
UpperBoundInclusive = 4,
LowerBoundInfinite = 8,
UpperBoundInfinite = 16
}
}