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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Xml
{
using System;
using System.Xml;
using System.Collections;
using System.Diagnostics;
using System.Runtime.Serialization;
using System.Collections.Generic;
using System.Collections.ObjectModel;
public class XmlBinaryWriterSession
{
PriorityDictionary<string, int> strings;
PriorityDictionary<IXmlDictionary, IntArray> maps;
int nextKey;
public XmlBinaryWriterSession()
{
this.nextKey = 0;
this.maps = new PriorityDictionary<IXmlDictionary, IntArray>();
this.strings = new PriorityDictionary<string, int>();
}
public virtual bool TryAdd(XmlDictionaryString value, out int key)
{
IntArray keys;
if (value == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("value");
if (maps.TryGetValue(value.Dictionary, out keys))
{
key = (keys[value.Key] - 1);
if (key != -1)
{
// If the key is already set, then something is wrong
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.XmlKeyAlreadyExists)));
}
key = Add(value.Value);
keys[value.Key] = (key + 1);
return true;
}
key = Add(value.Value);
keys = AddKeys(value.Dictionary, value.Key + 1);
keys[value.Key] = (key + 1);
return true;
}
int Add(string s)
{
int key = this.nextKey++;
strings.Add(s, key);
return key;
}
IntArray AddKeys(IXmlDictionary dictionary, int minCount)
{
IntArray keys = new IntArray(Math.Max(minCount, 16));
maps.Add(dictionary, keys);
return keys;
}
public void Reset()
{
nextKey = 0;
maps.Clear();
strings.Clear();
}
internal bool TryLookup(XmlDictionaryString s, out int key)
{
IntArray keys;
if (maps.TryGetValue(s.Dictionary, out keys))
{
key = (keys[s.Key] - 1);
if (key != -1)
{
return true;
}
}
if (strings.TryGetValue(s.Value, out key))
{
if (keys == null)
{
keys = AddKeys(s.Dictionary, s.Key + 1);
}
keys[s.Key] = (key + 1);
return true;
}
key = -1;
return false;
}
class PriorityDictionary<K, V> where K : class
{
Dictionary<K, V> dictionary;
Entry[] list;
int listCount;
int now;
public PriorityDictionary()
{
list = new Entry[16];
}
public void Clear()
{
now = 0;
listCount = 0;
Array.Clear(list, 0, list.Length);
if (dictionary != null)
dictionary.Clear();
}
public bool TryGetValue(K key, out V value)
{
for (int i = 0; i < listCount; i++)
{
if (list[i].Key == key)
{
value = list[i].Value;
list[i].Time = Now;
return true;
}
}
for (int i = 0; i < listCount; i++)
{
if (list[i].Key.Equals(key))
{
value = list[i].Value;
list[i].Time = Now;
return true;
}
}
if (dictionary == null)
{
value = default(V);
return false;
}
if (!dictionary.TryGetValue(key, out value))
{
return false;
}
int minIndex = 0;
int minTime = list[0].Time;
for (int i = 1; i < listCount; i++)
{
if (list[i].Time < minTime)
{
minIndex = i;
minTime = list[i].Time;
}
}
list[minIndex].Key = key;
list[minIndex].Value = value;
list[minIndex].Time = Now;
return true;
}
public void Add(K key, V value)
{
if (listCount < list.Length)
{
list[listCount].Key = key;
list[listCount].Value = value;
listCount++;
}
else
{
if (dictionary == null)
{
dictionary = new Dictionary<K, V>();
for (int i = 0; i < listCount; i++)
{
dictionary.Add(list[i].Key, list[i].Value);
}
}
dictionary.Add(key, value);
}
}
int Now
{
get
{
if (++now == int.MaxValue)
{
DecreaseAll();
}
return now;
}
}
void DecreaseAll()
{
for (int i = 0; i < listCount; i++)
{
list[i].Time /= 2;
}
now /= 2;
}
struct Entry
{
public K Key;
public V Value;
public int Time;
}
}
class IntArray
{
int[] array;
public IntArray(int size)
{
this.array = new int[size];
}
public int this[int index]
{
get
{
if (index >= array.Length)
return 0;
return array[index];
}
set
{
if (index >= array.Length)
{
int[] newArray = new int[Math.Max(index + 1, array.Length * 2)];
Array.Copy(array, newArray, array.Length);
array = newArray;
}
array[index] = value;
}
}
}
}
}
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