mcs/class/System.XML/System.Xml.Schema/XmlSchemaKey.cs

   1 // Author: Dwivedi, Ajay kumar
   2 //            Adwiv@Yahoo.com
   3
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining
   6 // a copy of this software and associated documentation files (the
   7 // "Software"), to deal in the Software without restriction, including
   8 // without limitation the rights to use, copy, modify, merge, publish,
   9 // distribute, sublicense, and/or sell copies of the Software, and to
  10 // permit persons to whom the Software is furnished to do so, subject to
  11 // the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be
  14 // included in all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 //
  24 using System;
  25 using System.Xml;
  26
  27 namespace System.Xml.Schema
  28 {
  29         /// <summary>
  30         /// Summary description for XmlSchemaKey.
  31         /// </summary>
  32         public class XmlSchemaKey : XmlSchemaIdentityConstraint
  33         {
  34                 const string xmlname = "key";
  35
  36                 public XmlSchemaKey()
  37                 {
  38                 }
  39                 /// <remarks>
  40                 /// 1. name must be present
  41                 /// 2. selector and field must be present
  42                 /// </remarks>
  43                 internal override int Compile(ValidationEventHandler h, XmlSchema schema)
  44                 {
  45                         return base.Compile(h, schema);
  46                 }
  47
  48                 /*
  49                 internal new void error(ValidationEventHandler handle, string message)
  50                 {
  51                         errorCount++;
  52                         ValidationHandler.RaiseValidationError(handle, this, message);
  53                 }
  54                 */
  55
  56                 //<key
  57                 //  id = ID
  58                 //  name = NCName
  59                 //  {any attributes with non-schema namespace . . .}>
  60                 //  Content: (annotation?, (selector, field+))
  61                 //</key>
  62                 internal static XmlSchemaKey Read(XmlSchemaReader reader, ValidationEventHandler h)
  63                 {
  64                         XmlSchemaKey key = new XmlSchemaKey();
  65                         reader.MoveToElement();
  66
  67                         if(reader.NamespaceURI != XmlSchema.Namespace || reader.LocalName != xmlname)
  68                         {
  69                                 error(h,"Should not happen :1: XmlSchemaKey.Read, name="+reader.Name,null);
  70                                 reader.Skip();
  71                                 return null;
  72                         }
  73
  74                         key.LineNumber = reader.LineNumber;
  75                         key.LinePosition = reader.LinePosition;
  76                         key.SourceUri = reader.BaseURI;
  77
  78                         while(reader.MoveToNextAttribute())
  79                         {
  80                                 if(reader.Name == "id")
  81                                 {
  82                                         key.Id = reader.Value;
  83                                 }
  84                                 else if(reader.Name == "name")
  85                                 {
  86                                         key.Name = reader.Value;
  87                                 }
  88                                 else if((reader.NamespaceURI == "" && reader.Name != "xmlns") || reader.NamespaceURI == XmlSchema.Namespace)
  89                                 {
  90                                         error(h,reader.Name + " is not a valid attribute for key",null);
  91                                 }
  92                                 else
  93                                 {
  94                                         XmlSchemaUtil.ReadUnhandledAttribute(reader,key);
  95                                 }
  96                         }
  97
  98                         reader.MoveToElement();
  99                         if(reader.IsEmptyElement)
 100                                 return key;
 101
 102                         //  Content: annotation?, selector, field+
 103                         int level = 1;
 104                         while(reader.ReadNextElement())
 105                         {
 106                                 if(reader.NodeType == XmlNodeType.EndElement)
 107                                 {
 108                                         if(reader.LocalName != xmlname)
 109                                                 error(h,"Should not happen :2: XmlSchemaKey.Read, name="+reader.Name,null);
 110                                         break;
 111                                 }
 112                                 if(level <= 1 && reader.LocalName == "annotation")
 113                                 {
 114                                         level = 2; //Only one annotation
 115                                         XmlSchemaAnnotation annotation = XmlSchemaAnnotation.Read(reader,h);
 116                                         if(annotation != null)
 117                                                 key.Annotation = annotation;
 118                                         continue;
 119                                 }
 120                                 if(level <= 2 && reader.LocalName == "selector")
 121                                 {
 122                                         level = 3;
 123                                         XmlSchemaXPath selector = XmlSchemaXPath.Read(reader,h,"selector");
 124                                         if(selector != null)
 125                                                 key.Selector = selector;
 126                                         continue;
 127                                 }
 128                                 if(level <= 3 && reader.LocalName == "field")
 129                                 {
 130                                         level = 3;
 131                                         if(key.Selector == null)
 132                                                 error(h,"selector must be defined before field declarations",null);
 133                                         XmlSchemaXPath field = XmlSchemaXPath.Read(reader,h,"field");
 134                                         if(field != null)
 135                                                 key.Fields.Add(field);
 136                                         continue;
 137                                 }
 138                                 reader.RaiseInvalidElementError();
 139                         }
 140                         return key;
 141                 }
 142         }
 143 }