class/System.XML/System.Xml.Schema/XmlSchemaUnique.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 XmlSchemaUnique.
  31         /// </summary>
  32         public class XmlSchemaUnique : XmlSchemaIdentityConstraint
  33         {
  34                 const string xmlname = "unique";
  35
  36                 public XmlSchemaUnique()
  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                 internal override int Validate(ValidationEventHandler h, XmlSchema schema)
  49                 {
  50                         return errorCount;
  51                 }
  52
  53                 /*
  54                 internal new void error(ValidationEventHandler handle, string message)
  55                 {
  56                         errorCount++;
  57                         ValidationHandler.RaiseValidationError(handle, this, message);
  58                 }
  59                 */
  60                 //<unique
  61                 //  id = ID
  62                 //  name = NCName
  63                 //  {any attributes with non-schema namespace . . .}>
  64                 //  Content: (annotation?, (selector, field+))
  65                 //</unique>
  66                 internal static XmlSchemaUnique Read(XmlSchemaReader reader, ValidationEventHandler h)
  67                 {
  68                         XmlSchemaUnique unique = new XmlSchemaUnique();
  69                         reader.MoveToElement();
  70
  71                         if(reader.NamespaceURI != XmlSchema.Namespace || reader.LocalName != xmlname)
  72                         {
  73                                 error(h,"Should not happen :1: XmlSchemaUnique.Read, name="+reader.Name,null);
  74                                 reader.Skip();
  75                                 return null;
  76                         }
  77
  78                         unique.LineNumber = reader.LineNumber;
  79                         unique.LinePosition = reader.LinePosition;
  80                         unique.SourceUri = reader.BaseURI;
  81
  82                         while(reader.MoveToNextAttribute())
  83                         {
  84                                 if(reader.Name == "id")
  85                                 {
  86                                         unique.Id = reader.Value;
  87                                 }
  88                                 else if(reader.Name == "name")
  89                                 {
  90                                         unique.Name = reader.Value;
  91                                 }
  92                                 else if((reader.NamespaceURI == "" && reader.Name != "xmlns") || reader.NamespaceURI == XmlSchema.Namespace)
  93                                 {
  94                                         error(h,reader.Name + " is not a valid attribute for unique",null);
  95                                 }
  96                                 else
  97                                 {
  98                                         XmlSchemaUtil.ReadUnhandledAttribute(reader,unique);
  99                                 }
 100                         }
 101
 102                         reader.MoveToElement();
 103                         if(reader.IsEmptyElement)
 104                                 return unique;
 105
 106                         //  Content: annotation?, selector, field+
 107                         int level = 1;
 108                         while(reader.ReadNextElement())
 109                         {
 110                                 if(reader.NodeType == XmlNodeType.EndElement)
 111                                 {
 112                                         if(reader.LocalName != xmlname)
 113                                                 error(h,"Should not happen :2: XmlSchemaUnion.Read, name="+reader.Name,null);
 114                                         break;
 115                                 }
 116                                 if(level <= 1 && reader.LocalName == "annotation")
 117                                 {
 118                                         level = 2; //Only one annotation
 119                                         XmlSchemaAnnotation annotation = XmlSchemaAnnotation.Read(reader,h);
 120                                         if(annotation != null)
 121                                                 unique.Annotation = annotation;
 122                                         continue;
 123                                 }
 124                                 if(level <= 2 && reader.LocalName == "selector")
 125                                 {
 126                                         level = 3;
 127                                         XmlSchemaXPath selector = XmlSchemaXPath.Read(reader,h,"selector");
 128                                         if(selector != null)
 129                                                 unique.Selector = selector;
 130                                         continue;
 131                                 }
 132                                 if(level <= 3 && reader.LocalName == "field")
 133                                 {
 134                                         level = 3;
 135                                         if(unique.Selector == null)
 136                                                 error(h,"selector must be defined before field declarations",null);
 137                                         XmlSchemaXPath field = XmlSchemaXPath.Read(reader, h, "field");
 138                                         if(field != null)
 139                                                 unique.Fields.Add(field);
 140                                         continue;
 141                                 }
 142                                 reader.RaiseInvalidElementError();
 143                         }
 144                         return unique;
 145                 }
 146         }
 147 }