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//
// AccessPathFilter.cs
//
// Authors:
// Alexander Chebaturkin (chebaturkin@gmail.com)
//
// Copyright (C) 2011 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;
namespace Mono.CodeContracts.Static.Analysis.HeapAnalysis.Paths {
class AccessPathFilter<TMember> {
public static AccessPathFilter<TMember> NoFilter = new AccessPathFilter<TMember> ();
private readonly Flags flags;
private readonly TMember member;
private readonly MemberFilter member_filter;
private AccessPathFilter ()
{
this.flags = Flags.AllowLocals;
this.member_filter = MemberFilter.NoFilter;
}
private AccessPathFilter (TMember member, MemberFilter memberFilter)
{
this.member_filter = memberFilter;
this.member = member;
}
public bool AllowLocal
{
get { return (this.flags & Flags.AllowLocals) == Flags.AllowLocals; }
}
public bool HasVisibilityMember
{
get { return this.member_filter != MemberFilter.NoFilter; }
}
public TMember VisibilityMember
{
get { return this.member; }
}
public static AccessPathFilter<TMember> FromPrecondition (TMember member)
{
return new AccessPathFilter<TMember> (member, MemberFilter.FromPrecondition);
}
public static AccessPathFilter<TMember> FromPostcondition (TMember member)
{
return new AccessPathFilter<TMember> (member, MemberFilter.FromPostcondition);
}
public static AccessPathFilter<TMember> IsVisibleFrom (TMember member)
{
return new AccessPathFilter<TMember> (member, MemberFilter.FromMethodBody);
}
public bool FilterOutPathElement<P> (P element)
where P : IVisibilityCheck<TMember>
{
switch (this.member_filter) {
case MemberFilter.FromPrecondition:
return !element.IsAsVisibleAs (this.member);
case MemberFilter.FromPostcondition:
return !element.IfRootIsParameter || !element.IsVisibleFrom (this.member);
case MemberFilter.FromMethodBody:
return !element.IsVisibleFrom (this.member);
default:
return false;
}
}
#region Nested type: Flags
[Flags]
private enum Flags {
AllowLocals = 1,
RequireParameter = 2
}
#endregion
#region Nested type: MemberFilter
private enum MemberFilter {
NoFilter = 0,
FromPrecondition,
FromPostcondition,
FromMethodBody
}
#endregion
}
}
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