class/System.XML/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.Generic;
  33 using System.Xml;
  34 using System.Xml.Schema;
  35
  36 namespace Mono.Xml
  37 {
  38         internal class SubtreeXmlReader : XmlReader, IXmlLineInfo, IXmlNamespaceResolver
  39         {
  40                 int startDepth;
  41                 bool eof;
  42                 bool initial;
  43                 bool read;
  44                 XmlReader Reader;
  45                 IXmlLineInfo li;
  46                 IXmlNamespaceResolver nsResolver;
  47
  48                 public SubtreeXmlReader (XmlReader reader)
  49                 {
  50                         this.Reader = reader;
  51                         li = reader as IXmlLineInfo;
  52                         nsResolver = reader as IXmlNamespaceResolver;
  53                         initial = true;
  54                         startDepth = reader.Depth;
  55                         if (reader.ReadState == ReadState.Initial)
  56                                 startDepth = -1; // end == the reader's end
  57                 }
  58
  59                 public override int AttributeCount {
  60                         get { return initial ? 0 : Reader.AttributeCount; }
  61                 }
  62
  63                 public override bool CanReadBinaryContent {
  64                         get { return Reader.CanReadBinaryContent; }
  65                 }
  66
  67                 public override bool CanReadValueChunk {
  68                         get { return Reader.CanReadValueChunk; }
  69                 }
  70
  71                 public override int Depth {
  72                         get { return Reader.Depth - startDepth; }
  73                 }
  74
  75                 public override string BaseURI {
  76                         get { return Reader.BaseURI; }
  77                 }
  78
  79                 public override bool EOF {
  80                         get { return eof || Reader.EOF; }
  81                 }
  82
  83                 public override bool IsEmptyElement {
  84                         get { return Reader.IsEmptyElement; }
  85                 }
  86
  87                 public int LineNumber {
  88                         get { return initial ? 0 : li != null ? li.LineNumber : 0; }
  89                 }
  90
  91                 public int LinePosition {
  92                         get { return initial ? 0 : li != null ? li.LinePosition : 0; }
  93                 }
  94
  95                 public override bool HasValue {
  96                         get { return initial || eof ? false : Reader.HasValue; }
  97                 }
  98
  99                 public override string LocalName {
 100                         get { return initial || eof ? String.Empty : Reader.LocalName; }
 101                 }
 102
 103                 public override string Name {
 104                         get { return initial || eof ? String.Empty : Reader.Name; }
 105                 }
 106
 107                 public override XmlNameTable NameTable {
 108                         get { return Reader.NameTable; }
 109                 }
 110
 111                 public override string NamespaceURI {
 112                         get { return initial || eof ? String.Empty : Reader.NamespaceURI; }
 113                 }
 114
 115                 public override XmlNodeType NodeType {
 116                         get { return initial || eof ? XmlNodeType.None : Reader.NodeType; }
 117                 }
 118
 119                 public override string Prefix {
 120                         get { return initial || eof ? String.Empty : Reader.Prefix; }
 121                 }
 122
 123                 public override ReadState ReadState {
 124                         get { return initial ? ReadState.Initial : eof ? ReadState.EndOfFile : Reader.ReadState ; }
 125                 }
 126
 127 #if !NET_2_1
 128                 public override IXmlSchemaInfo SchemaInfo {
 129                         get { return Reader.SchemaInfo; }
 130                 }
 131 #endif
 132
 133                 public override XmlReaderSettings Settings {
 134                         get { return Reader.Settings; }
 135                 }
 136
 137                 public override string Value {
 138                         get { return initial ? String.Empty : Reader.Value; }
 139                 }
 140
 141                 public override void Close ()
 142                 {
 143                         while (Read ())
 144                                 ;
 145                 }
 146
 147                 public override string GetAttribute (int i)
 148                 {
 149                         return initial ? null : Reader.GetAttribute (i);
 150                 }
 151
 152                 public override string GetAttribute (string name)
 153                 {
 154                         return initial ? null : Reader.GetAttribute (name);
 155                 }
 156
 157                 public override string GetAttribute (string local, string ns)
 158                 {
 159                         return initial ? null : Reader.GetAttribute (local, ns);
 160                 }
 161
 162                 IDictionary<string, string> IXmlNamespaceResolver.GetNamespacesInScope (XmlNamespaceScope scope)
 163                 {
 164                         return nsResolver != null ? nsResolver.GetNamespacesInScope (scope) :
 165                                 new Dictionary<string, string> ();
 166                 }
 167
 168                 public bool HasLineInfo ()
 169                 {
 170                         return li != null ? li.HasLineInfo () : false;
 171                 }
 172
 173                 public override string LookupNamespace (string prefix)
 174                 {
 175                         return Reader.LookupNamespace (prefix);
 176                 }
 177
 178                 string IXmlNamespaceResolver.LookupPrefix (string ns)
 179                 {
 180                         return nsResolver != null ? nsResolver.LookupPrefix (ns) : String.Empty;
 181                 }
 182
 183                 public override bool MoveToFirstAttribute ()
 184                 {
 185                         return initial ? false : Reader.MoveToFirstAttribute ();
 186                 }
 187
 188                 public override bool MoveToNextAttribute ()
 189                 {
 190                         return initial ? false : Reader.MoveToNextAttribute ();
 191                 }
 192
 193                 public override void MoveToAttribute (int i)
 194                 {
 195                         if (!initial)
 196                                 Reader.MoveToAttribute (i);
 197                 }
 198
 199                 public override bool MoveToAttribute (string name)
 200                 {
 201                         return initial ? false : Reader.MoveToAttribute (name);
 202                 }
 203
 204                 public override bool MoveToAttribute (string local, string ns)
 205                 {
 206                         return initial ? false : Reader.MoveToAttribute (local, ns);
 207                 }
 208
 209                 public override bool MoveToElement ()
 210                 {
 211                         return initial ? false : Reader.MoveToElement ();
 212                 }
 213
 214                 public override bool Read ()
 215                 {
 216                         if (initial) {
 217                                 initial = false;
 218                                 return true;
 219                         }
 220                         if (!read) {
 221                                 read = true;
 222                                 Reader.MoveToElement ();
 223                                 bool ret = !Reader.IsEmptyElement && Reader.Read ();
 224                                 if (!ret)
 225                                         eof = true;
 226                                 return ret;
 227                         }
 228                         Reader.MoveToElement ();
 229                         if (Reader.Depth > startDepth)
 230                                 if (Reader.Read ())
 231                                         return true;
 232                         eof = true;
 233                         return false;
 234                 }
 235
 236                 public override bool ReadAttributeValue ()
 237                 {
 238                         if (initial || eof)
 239                                 return false;
 240                         return Reader.ReadAttributeValue ();
 241                 }
 242
 243                 public override void ResolveEntity ()
 244                 {
 245                         if (initial || eof)
 246                                 return;
 247                         Reader.ResolveEntity ();
 248                 }
 249         }
 250 }
 251
 252 #endif