Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Xml/System/Xml/Dom/DomNameTable.cs

@@ -0,0 +1,113 @@
+//------------------------------------------------------------------------------
+// <copyright file="DomNameTable.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Diagnostics;
+using System.Xml.Schema;
+
+namespace System.Xml {
+
+    internal class DomNameTable {
+        XmlName[]    entries;
+        int          count;
+        int          mask;
+        XmlDocument  ownerDocument;
+        XmlNameTable nameTable;
+
+        const int InitialSize = 64; // must be a power of two
+
+        public DomNameTable( XmlDocument document ) {
+            ownerDocument = document;
+            nameTable = document.NameTable;
+            entries = new XmlName[InitialSize];
+            mask = InitialSize - 1;
+            Debug.Assert( ( entries.Length & mask ) == 0 );  // entries.Length must be a power of two
+        }
+
+        public XmlName GetName(string prefix, string localName, string ns, IXmlSchemaInfo schemaInfo) { 
+            if (prefix == null) {
+                prefix = string.Empty;
+            }
+            if (ns == null) {
+                ns = string.Empty;
+            }
+
+            int hashCode = XmlName.GetHashCode(localName);
+
+            for (XmlName e = entries[hashCode & mask]; e != null; e = e.next) {
+                if (e.HashCode == hashCode 
+                    && ((object)e.LocalName == (object)localName 
+                        || e.LocalName.Equals(localName)) 
+                    && ((object)e.Prefix == (object)prefix 
+                        || e.Prefix.Equals(prefix)) 
+                    && ((object)e.NamespaceURI == (object)ns 
+                        || e.NamespaceURI.Equals(ns))
+                    && e.Equals(schemaInfo)) {
+                    return e;
+                }
+            }
+            return null;
+        }
+
+        public XmlName AddName(string prefix, string localName, string ns, IXmlSchemaInfo schemaInfo) { 
+            if (prefix == null) {
+                prefix = string.Empty;
+            }
+            if (ns == null) {
+                ns = string.Empty;
+            }
+
+            int hashCode = XmlName.GetHashCode(localName);
+
+            for (XmlName e = entries[hashCode & mask]; e != null; e = e.next) {
+                if (e.HashCode == hashCode 
+                    && ((object)e.LocalName == (object)localName 
+                        || e.LocalName.Equals(localName)) 
+                    && ((object)e.Prefix == (object)prefix 
+                        || e.Prefix.Equals(prefix)) 
+                    && ((object)e.NamespaceURI == (object)ns 
+                        || e.NamespaceURI.Equals(ns))
+                    && e.Equals(schemaInfo)) {
+                    return e;
+                }
+            }
+
+            prefix = nameTable.Add(prefix);
+            localName = nameTable.Add(localName);
+            ns = nameTable.Add(ns);
+            int index = hashCode & mask;
+            XmlName name = XmlName.Create(prefix, localName, ns, hashCode, ownerDocument, entries[index], schemaInfo);
+            entries[index] = name;
+
+            if (count++ == mask) {
+                Grow();
+            }
+
+            return name;
+        }
+
+        private void Grow() {
+            int newMask = mask * 2 + 1;
+            XmlName[] oldEntries = entries;
+            XmlName[] newEntries = new XmlName[newMask+1];
+
+            // use oldEntries.Length to eliminate the rangecheck            
+            for ( int i = 0; i < oldEntries.Length; i++ ) {
+                XmlName name = oldEntries[i];
+                while ( name != null ) {
+                    int newIndex = name.HashCode & newMask;
+                    XmlName tmp = name.next;
+                    name.next = newEntries[newIndex];
+                    newEntries[newIndex] = name;
+                    name = tmp;
+                }
+            }
+            entries = newEntries;
+            mask = newMask;
+        }
+    }
+}