93 lines
2.7 KiB
C#
93 lines
2.7 KiB
C#
//
|
|
// EmptyNode.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 System.Collections.Generic;
|
|
using System.IO;
|
|
using System.Text;
|
|
|
|
namespace Mono.CodeContracts.Static.DataStructures.Patricia
|
|
{
|
|
public class EmptyNode<T> : PatriciaTrieNode<T>
|
|
{
|
|
public static readonly EmptyNode<T> Instance = new EmptyNode<T>();
|
|
|
|
public override bool Contains(int key)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
public override int Key { get { throw new NotSupportedException("No key for empty node");} }
|
|
|
|
public override int Count
|
|
{
|
|
get { return 0; }
|
|
}
|
|
|
|
public override IImmutableIntMap<T> Add(int key, T value)
|
|
{
|
|
return new LeafNode<T>(key, value);
|
|
}
|
|
|
|
public override IImmutableIntMap<T> Remove(int key)
|
|
{
|
|
return this;
|
|
}
|
|
|
|
public override void Visit(Action<T> action)
|
|
{
|
|
}
|
|
|
|
public override void Visit(Action<int, T> action)
|
|
{
|
|
}
|
|
|
|
protected internal override void FillKeysTo(List<int> list)
|
|
{
|
|
}
|
|
|
|
protected internal override void FillValuesTo(List<T> list)
|
|
{
|
|
}
|
|
|
|
protected internal override void AppendToBuilder(StringBuilder sb)
|
|
{
|
|
sb.Append("*");
|
|
}
|
|
|
|
protected internal override void Dump(TextWriter tw, string prefix)
|
|
{
|
|
tw.WriteLine(prefix + "<empty/>");
|
|
}
|
|
|
|
public override T Lookup(int key)
|
|
{
|
|
return default(T);
|
|
}
|
|
}
|
|
} |