Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Serialization / System / Xml / XmlBinaryWriterSession.cs / 1 / XmlBinaryWriterSession.cs
//------------------------------------------------------------ // 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 { PriorityDictionarystrings; PriorityDictionary maps; int nextKey; public XmlBinaryWriterSession() { this.nextKey = 0; this.maps = new PriorityDictionary (); this.strings = new PriorityDictionary (); } 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 where K : class { Dictionary 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 (); 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; } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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