Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / NameTable.cs / 1305376 / 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, len ) ) { 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, len ) ) { 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 str1, char[] str2, int str2Start, int str2Length ) { if ( str1.Length != str2Length ) { return false; } // use array.Length to eliminate the rangecheck for ( int i = 0; i < str1.Length; i++ ) { if ( str1[i] != str2[str2Start+i] ) { return false; } } return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PageHandlerFactory.cs
- PropertyRecord.cs
- RetrieveVirtualItemEventArgs.cs
- GridViewColumnHeader.cs
- EntityTypeBase.cs
- TitleStyle.cs
- DirtyTextRange.cs
- UnSafeCharBuffer.cs
- LazyTextWriterCreator.cs
- HtmlListAdapter.cs
- DesignerTransactionCloseEvent.cs
- SendSecurityHeaderElement.cs
- BamlLocalizerErrorNotifyEventArgs.cs
- ClientBuildManager.cs
- IsolatedStorageFile.cs
- ToolStripDropDownMenu.cs
- GeometryModel3D.cs
- DesignObjectWrapper.cs
- BufferedGraphicsContext.cs
- CodeAttributeArgumentCollection.cs
- Selector.cs
- XsdDuration.cs
- TransactionInformation.cs
- PropertyGrid.cs
- InputEventArgs.cs
- FontFaceLayoutInfo.cs
- DockPattern.cs
- Column.cs
- PackWebRequestFactory.cs
- TextEditorSpelling.cs
- StyleTypedPropertyAttribute.cs
- NativeMethods.cs
- DataGridColumnCollection.cs
- MemoryFailPoint.cs
- xsdvalidator.cs
- ObjectContext.cs
- CharacterShapingProperties.cs
- EmptyEnumerable.cs
- odbcmetadatafactory.cs
- DynamicField.cs
- DataKeyArray.cs
- Soap11ServerProtocol.cs
- DefaultTraceListener.cs
- Transactions.cs
- ObjectDataSourceSelectingEventArgs.cs
- SingletonConnectionReader.cs
- ByteFacetDescriptionElement.cs
- EdgeProfileValidation.cs
- ImageConverter.cs
- ErrorRuntimeConfig.cs
- ServiceObjectContainer.cs
- DataPagerFieldCommandEventArgs.cs
- GridViewSortEventArgs.cs
- GeometryHitTestResult.cs
- DataContractSerializerSection.cs
- BrushValueSerializer.cs
- FixedTextView.cs
- DataKey.cs
- ConfigXmlDocument.cs
- List.cs
- CellParagraph.cs
- ResourcesGenerator.cs
- GeneralTransform2DTo3DTo2D.cs
- HeaderCollection.cs
- SmtpDigestAuthenticationModule.cs
- Context.cs
- CompositionTarget.cs
- FormatSettings.cs
- NamedPipeTransportSecurityElement.cs
- FontSource.cs
- ContentDesigner.cs
- FileEnumerator.cs
- EmulateRecognizeCompletedEventArgs.cs
- MenuStrip.cs
- TcpStreams.cs
- CheckBoxFlatAdapter.cs
- StringAnimationBase.cs
- PropertyDescriptorComparer.cs
- StylusPointDescription.cs
- SendMailErrorEventArgs.cs
- ZipPackage.cs
- DoubleIndependentAnimationStorage.cs
- SelectionItemPattern.cs
- ReadOnlyKeyedCollection.cs
- typedescriptorpermissionattribute.cs
- BaseWebProxyFinder.cs
- util.cs
- WeakReferenceKey.cs
- TitleStyle.cs
- safelinkcollection.cs
- WinFormsComponentEditor.cs
- StickyNote.cs
- TextTreeNode.cs
- DiscoveryClientProtocol.cs
- SmiMetaDataProperty.cs
- RuleSettings.cs
- ConfigurationProperty.cs
- PingReply.cs
- ThemeConfigurationDialog.cs
- UriSection.cs