Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / NameTable.cs / 1 / NameTable.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; namespace System.Xml { ////// /// public class NameTable : XmlNameTable { // // Private types // class Entry { internal string str; internal int hashCode; internal Entry next; internal Entry( string str, int hashCode, Entry next ) { this.str = str; this.hashCode = hashCode; this.next = next; } } // // Fields // Entry[] entries; int count; int mask; int hashCodeRandomizer; // // Constructor // ////// XmlNameTable implemented as a simple hash table. /// ////// /// Public constructor. /// public NameTable() { mask = 31; entries = new Entry[mask+1]; hashCodeRandomizer = Environment.TickCount; } // // XmlNameTable public methods // ////// /// Add the given string to the NameTable or return /// the existing string if it is already in the NameTable. /// public override string Add( string key ) { if ( key == null ) { throw new ArgumentNullException( "key" ); } int len = key.Length; if ( len == 0 ) { return string.Empty; } int hashCode = len + hashCodeRandomizer; // use key.Length to eliminate the rangecheck for ( int i = 0; i < key.Length; i++ ) { hashCode += ( hashCode << 7 ) ^ key[i]; } // mix it a bit more hashCode -= hashCode >> 17; hashCode -= hashCode >> 11; hashCode -= hashCode >> 5; for ( Entry e = entries[hashCode & mask]; e != null; e = e.next ) { if ( e.hashCode == hashCode && e.str.Equals( key ) ) { return e.str; } } return AddEntry( key, hashCode ); } ////// /// Add the given string to the NameTable or return /// the existing string if it is already in the NameTable. /// public override string Add( char[] key, int start, int len ) { if ( len == 0 ) { return string.Empty; } int hashCode = len + hashCodeRandomizer; hashCode += ( hashCode << 7 ) ^ key[start]; // this will throw IndexOutOfRangeException in case the start index is invalid int end = start+len; for ( int i = start + 1; i < end; i++) { hashCode += ( hashCode << 7 ) ^ key[i]; } // mix it a bit more hashCode -= hashCode >> 17; hashCode -= hashCode >> 11; hashCode -= hashCode >> 5; for ( Entry e = entries[hashCode & mask]; e != null; e = e.next ) { if ( e.hashCode == hashCode && TextEquals( e.str, key, start ) ) { return e.str; } } return AddEntry( new string( key, start, len ), hashCode ); } ////// /// Find the matching string in the NameTable. /// public override string Get( string value ) { if ( value == null ) { throw new ArgumentNullException("value"); } if ( value.Length == 0 ) { return string.Empty; } int len = value.Length + hashCodeRandomizer; int hashCode = len; // use value.Length to eliminate the rangecheck for ( int i = 0; i < value.Length; i++ ) { hashCode += ( hashCode << 7 ) ^ value[i]; } // mix it a bit more hashCode -= hashCode >> 17; hashCode -= hashCode >> 11; hashCode -= hashCode >> 5; for ( Entry e = entries[hashCode & mask]; e != null; e = e.next ) { if ( e.hashCode == hashCode && e.str.Equals( value ) ) { return e.str; } } return null; } ////// /// Find the matching string atom given a range of /// characters. /// public override string Get( char[] key, int start, int len ) { if ( len == 0 ) { return string.Empty; } int hashCode = len + hashCodeRandomizer; hashCode += ( hashCode << 7 ) ^ key[start]; // this will throw IndexOutOfRangeException in case the start index is invalid int end = start+len; for ( int i = start + 1; i < end; i++) { hashCode += ( hashCode << 7 ) ^ key[i]; } // mix it a bit more hashCode -= hashCode >> 17; hashCode -= hashCode >> 11; hashCode -= hashCode >> 5; for ( Entry e = entries[hashCode & mask]; e != null; e = e.next ) { if ( e.hashCode == hashCode && TextEquals( e.str, key, start ) ) { return e.str; } } return null; } // // Private methods // private string AddEntry( string str, int hashCode ) { int index = hashCode & mask; Entry e = new Entry( str, hashCode, entries[index] ); entries[index] = e; if ( count++ == mask ) { Grow(); } return e.str; } private void Grow() { int newMask = mask * 2 + 1; Entry[] oldEntries = entries; Entry[] newEntries = new Entry[newMask+1]; // use oldEntries.Length to eliminate the rangecheck for ( int i = 0; i < oldEntries.Length; i++ ) { Entry e = oldEntries[i]; while ( e != null ) { int newIndex = e.hashCode & newMask; Entry tmp = e.next; e.next = newEntries[newIndex]; newEntries[newIndex] = e; e = tmp; } } entries = newEntries; mask = newMask; } private static bool TextEquals( string array, char[] text, int start ) { // use array.Length to eliminate the rangecheck for ( int i = 0; i < array.Length; i++ ) { if ( array[i] != text[start+i] ) { return false; } } return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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