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//
// BoxedVariable.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2012 Alexander Chebaturkin
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using Mono.CodeContracts.Static.DataStructures;
namespace Mono.CodeContracts.Static.Analysis.Numerical {
class BoxedVariable<TVar> : IEquatable<BoxedVariable<TVar>> {
readonly InnerVariable inner_variable;
readonly VariableKind kind;
readonly TVar variable;
public BoxedVariable (TVar variable)
{
if (variable != null) {
this.variable = variable;
inner_variable = null;
kind = VariableKind.Normal;
}
else {
this.variable = default(TVar);
inner_variable = new InnerVariable ();
kind = VariableKind.Slack;
}
}
BoxedVariable ()
{
variable = default (TVar);
inner_variable = new InnerVariable ();
kind = VariableKind.Slack;
}
public bool Equals (BoxedVariable<TVar> that)
{
if (ReferenceEquals (this, that))
return true;
if (ReferenceEquals (that, null))
return false;
if (inner_variable != null)
return inner_variable.Equals (that.inner_variable);
return variable != null && variable.Equals (that.variable);
}
public override bool Equals (object obj)
{
if (ReferenceEquals (this, obj))
return true;
if (obj is TVar && inner_variable == null)
return variable.Equals (obj);
var that = obj as BoxedVariable<TVar>;
if (that != null) {
if (inner_variable != null)
return inner_variable.Equals (that.inner_variable);
if (variable != null)
return variable.Equals (that.variable);
}
return false;
}
public override int GetHashCode ()
{
return inner_variable != null
? inner_variable.GetHashCode ()
: variable.GetHashCode ();
}
public override string ToString ()
{
if (kind == VariableKind.Slack)
return "s" + inner_variable;
if (inner_variable != null)
return inner_variable.ToString ();
return variable.ToString ();
}
public bool TryUnpackVariable (out TVar value)
{
if (inner_variable != null)
return false.Without (out value);
return true.With (variable, out value);
}
public static BoxedVariable<TVar> SlackVariable ()
{
return new BoxedVariable<TVar> ();
}
public static void ResetFreshVariableCounter ()
{
InnerVariable.ResetFreshVariableCounter ();
}
#region Nested type: InnerVariable
class InnerVariable {
static int count;
static int start_count;
readonly int id;
readonly int start_id;
public InnerVariable ()
{
id = count++;
start_id = start_count++;
}
public override bool Equals (object obj)
{
if (ReferenceEquals (this, obj))
return true;
var innerVariable = obj as InnerVariable;
return innerVariable != null && innerVariable.id == id;
}
public override int GetHashCode ()
{
return id;
}
public override string ToString ()
{
return string.Format ("iv{0}", id - start_id);
}
public static void ResetFreshVariableCounter ()
{
start_count = count;
}
}
#endregion
#region Nested type: VariableKind
enum VariableKind {
Normal,
Slack
}
#endregion
}
}
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