mcs/class/Mono.Xml.Ext/Mono.Xml/SubtreeXmlReader.cs

   1 //
   2 // SubtreeXmlReader.cs - reads descendant nodes in XmlReader
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // Copyright (c) 2004 Novell Inc. All rights reserved
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_2_0
  30
  31 using System;
  32 using System.Collections;
  33 using System.Xml;
  34
  35 namespace Mono.Xml
  36 {
  37         public class SubtreeXmlReader : XmlReader, IXmlLineInfo, IXmlNamespaceResolver
  38         {
  39                 int startDepth;
  40                 bool eof;
  41                 bool initial;
  42                 bool read;
  43                 XmlReader Reader;
  44                 IXmlLineInfo li;
  45                 IXmlNamespaceResolver nsResolver;
  46
  47                 public SubtreeXmlReader (XmlReader reader)
  48                 {
  49                         this.Reader = reader;
  50                         li = reader as IXmlLineInfo;
  51                         nsResolver = reader as IXmlNamespaceResolver;
  52                         initial = true;
  53                         startDepth = reader.Depth;
  54                         if (reader.ReadState == ReadState.Initial)
  55                                 startDepth = -1; // end == the reader's end
  56                 }
  57
  58                 public override int AttributeCount {
  59                         get { return initial ? 0 : Reader.AttributeCount; }
  60                 }
  61
  62                 public override int Depth {
  63                         get { return Reader.Depth - startDepth; }
  64                 }
  65
  66                 public override string BaseURI {
  67                         get { return Reader.BaseURI; }
  68                 }
  69
  70                 public override bool EOF {
  71                         get { return eof || Reader.EOF; }
  72                 }
  73
  74                 public int LineNumber {
  75                         get { return initial ? 0 : li != null ? li.LineNumber : 0; }
  76                 }
  77
  78                 public int LinePosition {
  79                         get { return initial ? 0 : li != null ? li.LinePosition : 0; }
  80                 }
  81
  82                 public override bool HasValue {
  83                         get { return initial ? false : Reader.HasValue; }
  84                 }
  85
  86                 public override string LocalName {
  87                         get { return initial ? String.Empty : Reader.LocalName; }
  88                 }
  89
  90                 public override string Name {
  91                         get { return initial ? String.Empty : Reader.Name; }
  92                 }
  93
  94                 public override XmlNameTable NameTable {
  95                         get { return Reader.NameTable; }
  96                 }
  97
  98                 public override string NamespaceURI {
  99                         get { return initial ? String.Empty : Reader.NamespaceURI; }
 100                 }
 101
 102                 public override XmlNodeType NodeType {
 103                         get { return initial ? XmlNodeType.None : Reader.NodeType; }
 104                 }
 105
 106                 public override string Prefix {
 107                         get { return initial ? String.Empty : Reader.Prefix; }
 108                 }
 109
 110                 public override ReadState ReadState {
 111                         get { return initial ? ReadState.Initial : eof ? ReadState.EndOfFile : Reader.ReadState ; }
 112                 }
 113
 114                 public override XmlReaderSettings Settings {
 115                         get { return Reader.Settings; }
 116                 }
 117
 118                 public override string Value {
 119                         get { return initial ? String.Empty : Reader.Value; }
 120                 }
 121
 122                 public override void Close ()
 123                 {
 124                         // do nothing
 125                 }
 126
 127                 public override string GetAttribute (int i)
 128                 {
 129                         return initial ? null : Reader.GetAttribute (i);
 130                 }
 131
 132                 public override string GetAttribute (string name)
 133                 {
 134                         return initial ? null : Reader.GetAttribute (name);
 135                 }
 136
 137                 public override string GetAttribute (string local, string ns)
 138                 {
 139                         return initial ? null : Reader.GetAttribute (local, ns);
 140                 }
 141
 142                 IDictionary IXmlNamespaceResolver.GetNamespacesInScope (XmlNamespaceScope scope)
 143                 {
 144                         return nsResolver != null ? nsResolver.GetNamespacesInScope (scope) : new Hashtable ();
 145                 }
 146
 147                 public bool HasLineInfo ()
 148                 {
 149                         return li != null ? li.HasLineInfo () : false;
 150                 }
 151
 152                 public override string LookupNamespace (string prefix)
 153                 {
 154                         return Reader.LookupNamespace (prefix);
 155                 }
 156
 157                 string IXmlNamespaceResolver.LookupPrefix (string ns)
 158                 {
 159                         return nsResolver != null ? nsResolver.LookupPrefix (ns) : String.Empty;
 160                 }
 161
 162                 string IXmlNamespaceResolver.LookupPrefix (string ns, bool atomizedNames)
 163                 {
 164                         return nsResolver != null ? nsResolver.LookupPrefix (ns, atomizedNames) : String.Empty;
 165                 }
 166
 167                 public override bool MoveToFirstAttribute ()
 168                 {
 169                         return initial ? false : Reader.MoveToFirstAttribute ();
 170                 }
 171
 172                 public override bool MoveToNextAttribute ()
 173                 {
 174                         return initial ? false : Reader.MoveToNextAttribute ();
 175                 }
 176
 177                 public override void MoveToAttribute (int i)
 178                 {
 179                         if (!initial)
 180                                 Reader.MoveToAttribute (i);
 181                 }
 182
 183                 public override bool MoveToAttribute (string name)
 184                 {
 185                         return initial ? false : Reader.MoveToAttribute (name);
 186                 }
 187
 188                 public override bool MoveToAttribute (string local, string ns)
 189                 {
 190                         return initial ? false : Reader.MoveToAttribute (local, ns);
 191                 }
 192
 193                 public override bool MoveToElement ()
 194                 {
 195                         return initial ? false : Reader.MoveToElement ();
 196                 }
 197
 198                 public override bool Read ()
 199                 {
 200                         if (initial) {
 201                                 initial = false;
 202                                 return true;
 203                         }
 204                         if (!read) {
 205                                 read = true;
 206                                 return !Reader.IsEmptyElement && Reader.Read ();
 207                         }
 208                         if (Reader.Depth > startDepth)
 209                                 if (Reader.Read ())
 210                                         return true;
 211                         eof = true;
 212                         return false;
 213                 }
 214
 215                 public override bool ReadAttributeValue ()
 216                 {
 217                         if (initial || eof)
 218                                 return false;
 219                         return Reader.ReadAttributeValue ();
 220                 }
 221
 222                 public override void ResolveEntity ()
 223                 {
 224                         if (initial || eof)
 225                                 return;
 226                         Reader.ResolveEntity ();
 227                 }
 228         }
 229 }
 230
 231 #endif