Merge pull request #409 from Alkarex/patch-1
[mono.git] / mcs / class / Mono.CodeContracts / Mono.CodeContracts.Static.Analysis.Numerical / IntervalRationalContextBase.cs
1 // 
2 // IntervalRationalContextBase.cs
3 // 
4 // Authors:
5 //      Alexander Chebaturkin (chebaturkin@gmail.com)
6 // 
7 // Copyright (C) 2012 Alexander Chebaturkin
8 // 
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
16 // 
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
19 //  
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 //
28
29 using Mono.CodeContracts.Static.Lattices;
30
31 namespace Mono.CodeContracts.Static.Analysis.Numerical {
32         abstract class IntervalRationalContextBase<TInterval> : IntervalContextBase<TInterval, Rational>
33                 where TInterval : IntervalBase<TInterval, Rational> {
34                 public override bool IsGreaterThanZero (Rational value)
35                 {
36                         return value > Rational.Zero;
37                 }
38
39                 public override bool IsGreaterEqualThanZero (Rational value)
40                 {
41                         return value >= Rational.Zero;
42                 }
43
44                 public override bool IsLessThanZero (Rational value)
45                 {
46                         return value < Rational.Zero;
47                 }
48
49                 public override bool IsLessEqualThanZero (Rational value)
50                 {
51                         return value <= Rational.Zero;
52                 }
53
54                 public override bool IsLessEqualThanZero (TInterval value)
55                 {
56                         if (value.IsNormal ())
57                                 return IsLessEqualThanZero (value.UpperBound);
58
59                         return false;
60                 }
61
62                 public override bool IsLessThan (Rational a, Rational b)
63                 {
64                         return a < b;
65                 }
66
67                 public override bool IsLessEqualThan (Rational a, Rational b)
68                 {
69                         return a <= b;
70                 }
71
72                 public override bool IsZero (Rational value)
73                 {
74                         return value.IsZero;
75                 }
76
77                 public override bool IsNotZero (Rational value)
78                 {
79                         return !value.IsZero;
80                 }
81
82                 public override bool IsPlusInfinity (Rational value)
83                 {
84                         return value.IsPlusInfinity;
85                 }
86
87                 public override bool IsMinusInfinity (Rational value)
88                 {
89                         return value.IsMinusInfinity;
90                 }
91
92                 public override bool AreEqual (Rational a, Rational b)
93                 {
94                         return a == b;
95                 }
96
97                 public override bool IsMaxInt32 (TInterval value)
98                 {
99                         return value.IsSinglePoint && value.LowerBound.IsInteger && (int) value.LowerBound.NextInt32 == int.MaxValue;
100                 }
101                 }
102 }