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

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