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//
// BranchNode.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 BranchNode<T> : PatriciaTrieNode<T>
{
private readonly int count;
public readonly int Prefix;
public readonly int BranchingBit;
public readonly PatriciaTrieNode<T> Left;
public readonly PatriciaTrieNode<T> Right;
public override int Key { get { return Prefix; } }
public override int Count { get { return count; } }
public BranchNode(int prefix, int branchingBit, PatriciaTrieNode<T> left, PatriciaTrieNode<T> right)
{
Prefix = prefix;
BranchingBit = branchingBit;
Left = left;
Right = right;
count = left.Count + right.Count;
}
public override bool Contains(int key)
{
if (!MatchPrefix(key, Prefix, BranchingBit))
return false;
var child = IsZeroBitAt(key, BranchingBit) ? Left : Right;
return child.Contains(key);
}
public override IImmutableIntMap<T> Add(int key, T value)
{
if (!MatchPrefix(key, Prefix, BranchingBit))
return Join(new LeafNode<T>(key, value), this);
if (IsZeroBitAt(key, BranchingBit))
return new BranchNode<T>(Prefix, BranchingBit, (PatriciaTrieNode<T>)Left.Add(key, value), Right);
return new BranchNode<T>(Prefix, BranchingBit, Left, (PatriciaTrieNode<T>)Right.Add(key, value));
}
public override IImmutableIntMap<T> Remove(int key)
{
var left = Left;
var right = Right;
if (IsZeroBitAt(key, BranchingBit))
{
left = (PatriciaTrieNode<T>)left.Remove(key);
if (left.Count == 0)
return right;
}
else
{
right = (PatriciaTrieNode<T>)right.Remove(key);
if (right.Count == 0)
return left;
}
return Join(left, right);
}
public override void Visit(Action<T> action)
{
Left.Visit(action);
Right.Visit(action);
}
public override void Visit(Action<int, T> action)
{
Left.Visit(action);
Right.Visit(action);
}
public override T Lookup(int key)
{
BranchNode<T> current = this;
PatriciaTrieNode<T> child;
do
{
child = IsZeroBitAt(key, current.BranchingBit) ? current.Left : current.Right;
current = child as BranchNode<T>;
}
while (current != null);
return child.Lookup(key);
}
protected internal override void FillKeysTo(List<int> list)
{
Left.FillKeysTo(list);
Right.FillKeysTo(list);
}
protected internal override void FillValuesTo(List<T> list)
{
Left.FillValuesTo(list);
Right.FillValuesTo(list);
}
protected internal override void AppendToBuilder(StringBuilder sb)
{
Left.AppendToBuilder(sb);
Right.AppendToBuilder(sb);
}
protected internal override void Dump(TextWriter tw, string prefix)
{
tw.WriteLine(prefix + "<Branch Prefix={0} BranchingBit={1}>", Prefix, BranchingBit);
Left.Dump(tw, prefix + " ");
Right.Dump(tw, prefix + " ");
tw.WriteLine(prefix + "</Branch>");
}
}
}
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