Merge pull request #2942 from jogibear9988/patch-2
[mono.git] / mcs / class / Mono.CodeContracts / Mono.CodeContracts.Static.Analysis.Numerical / IntervalEnvironment.cs
1 // 
2 // IntervalEnvironment.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 System;
30
31 using Mono.CodeContracts.Static.Lattices;
32
33 namespace Mono.CodeContracts.Static.Analysis.Numerical {
34         class IntervalEnvironment<TVar, TExpr> :
35                 IntervalEnvironmentBase<TVar, TExpr, Interval, Rational>
36                 where TVar : IEquatable<TVar> {
37                 static IntervalAssumer<TVar, TExpr> cachedAssumer;
38
39                 public IntervalEnvironment (IExpressionDecoder<TVar, TExpr> decoder)
40                         : base (decoder)
41                 {
42                 }
43
44                 IntervalEnvironment
45                         (IExpressionDecoder<TVar, TExpr> decoder,
46                          EnvironmentDomain<TVar, Interval> varsToInterval)
47                         : base (decoder, varsToInterval)
48                 {
49                 }
50
51                 public override IntervalAssumerBase<TVar, TExpr, Interval, Rational>
52                         Assumer { get { return cachedAssumer ?? (cachedAssumer = new IntervalAssumer<TVar, TExpr> ()); } }
53
54                 public override IntervalContextBase<Interval, Rational> Context { get { return IntervalContext.Instance; } }
55
56                 protected override IntervalEnvironmentBase<TVar, TExpr, Interval, Rational> NewInstance
57                         (EnvironmentDomain<TVar, Interval> varsToIntervals)
58                 {
59                         return new IntervalEnvironment<TVar, TExpr> (Decoder, varsToIntervals);
60                 }
61
62                 public override IntervalEnvironmentBase<TVar, TExpr, Interval, Rational> AssumeVariableIn
63                         (TVar var, Interval interval)
64                 {
65                         return RefineVariable (var, interval);
66                 }
67         }
68 }