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//
// DoubleImmutableMap.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;
using System.Collections.Generic;
namespace Mono.CodeContracts.Static.DataStructures {
class DoubleImmutableMap<A, B, C>
where A : IEquatable<A>
where B : IEquatable<B> {
private readonly B[] EmptyCache = new B[0];
private readonly IImmutableMap<A, IImmutableMap<B, C>> map;
private DoubleImmutableMap (IImmutableMap<A, IImmutableMap<B, C>> map)
{
this.map = map;
}
public C this [A key1, B key2]
{
get
{
IImmutableMap<B, C> inner = this.map [key1];
if (inner == null)
return default(C);
return inner [key2];
}
}
public int Keys1Count
{
get { return this.map.Count; }
}
public IEnumerable<A> Keys1
{
get { return this.map.Keys; }
}
public DoubleImmutableMap<A, B, C> Add (A key1, B key2, C value)
{
IImmutableMap<B, C> immutableMap = this.map [key1] ?? ImmutableMap<B, C>.Empty;
return new DoubleImmutableMap<A, B, C> (this.map.Add (key1, immutableMap.Add (key2, value)));
}
public DoubleImmutableMap<A, B, C> RemoveAll (A key1)
{
return new DoubleImmutableMap<A, B, C> (this.map.Remove (key1));
}
public DoubleImmutableMap<A, B, C> Remove (A key1, B key2)
{
IImmutableMap<B, C> inner = this.map [key1];
if (inner == null)
return this;
IImmutableMap<B, C> newInner = inner.Remove (key2);
if (newInner == inner)
return this;
return new DoubleImmutableMap<A, B, C> (this.map.Add (key1, newInner));
}
public static DoubleImmutableMap<A, B, C> Empty (Func<A, int> uniqueIdGenerator)
{
return new DoubleImmutableMap<A, B, C> (ImmutableIntKeyMap<A, IImmutableMap<B, C>>.Empty (uniqueIdGenerator));
}
public bool Contains (A key1, B key2)
{
IImmutableMap<B, C> inner = this.map [key1];
if (inner == null)
return false;
return inner.ContainsKey (key2);
}
public bool ContainsKey1 (A key1)
{
return this.map.ContainsKey (key1);
}
public int Keys2Count (A key1)
{
if (key1 == null)
return 0;
IImmutableMap<B, C> inner = this.map [key1];
if (inner == null)
return 0;
return inner.Count;
}
public IEnumerable<B> Keys2 (A key1)
{
if (key1 == null)
return this.EmptyCache;
IImmutableMap<B, C> inner = this.map [key1];
if (inner == null)
return this.EmptyCache;
return inner.Keys;
}
}
}
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