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// Author: Dwivedi, Ajay kumar
// Adwiv@Yahoo.com
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Xml;
using System.Xml.Serialization;
namespace System.Xml.Schema
{
/// <summary>
/// Summary description for XmlSchemaKeyref.
/// </summary>
public class XmlSchemaKeyref : XmlSchemaIdentityConstraint
{
private XmlQualifiedName refer;
const string xmlname = "keyref";
private XmlSchemaIdentityConstraint target;
public XmlSchemaKeyref()
{
refer = XmlQualifiedName.Empty;
}
[System.Xml.Serialization.XmlAttribute("refer")]
public XmlQualifiedName Refer
{
get{ return refer; }
set{ refer = value; }
}
internal XmlSchemaIdentityConstraint Target
{
get { return target; }
}
/// <remarks>
/// 1. name must be present
/// 2. selector and field must be present
/// 3. refer must be present
/// </remarks>
internal override int Compile(ValidationEventHandler h, XmlSchema schema)
{
base.Compile(h, schema);
if(refer == null || refer.IsEmpty)
error(h,"refer must be present");
else if(!XmlSchemaUtil.CheckQName(refer))
error(h,"Refer is not a valid XmlQualifiedName");
return errorCount;
}
internal override int Validate (ValidationEventHandler h, XmlSchema schema)
{
// Find target key
XmlSchemaIdentityConstraint target = schema.NamedIdentities [this.Refer] as XmlSchemaIdentityConstraint;
if (target == null)
error (h, "Target key was not found.");
else if (target is XmlSchemaKeyref)
error (h, "Target identity constraint was keyref.");
else if (target.Fields.Count != this.Fields.Count)
error (h, "Target identity constraint has different number of fields.");
else
this.target = target;
return errorCount;
}
/*
internal new void error(ValidationEventHandler handle, string message)
{
errorCount++;
ValidationHandler.RaiseValidationError(handle, this, message);
}
*/
//<key
// id = ID
// name = NCName
// refer = QName
// {any attributes with non-schema namespace . . .}>
// Content: (annotation?, (selector, field+))
//</key>
internal static XmlSchemaKeyref Read(XmlSchemaReader reader, ValidationEventHandler h)
{
XmlSchemaKeyref keyref = new XmlSchemaKeyref();
reader.MoveToElement();
if(reader.NamespaceURI != XmlSchema.Namespace || reader.LocalName != xmlname)
{
error(h,"Should not happen :1: XmlSchemaKeyref.Read, name="+reader.Name,null);
reader.Skip();
return null;
}
keyref.LineNumber = reader.LineNumber;
keyref.LinePosition = reader.LinePosition;
keyref.SourceUri = reader.BaseURI;
while(reader.MoveToNextAttribute())
{
if(reader.Name == "id")
{
keyref.Id = reader.Value;
}
else if(reader.Name == "name")
{
keyref.Name = reader.Value;
}
else if(reader.Name == "refer")
{
Exception innerex;
keyref.refer = XmlSchemaUtil.ReadQNameAttribute(reader,out innerex);
if(innerex != null)
error(h, reader.Value + " is not a valid value for refer attribute",innerex);
}
else if((reader.NamespaceURI == "" && reader.Name != "xmlns") || reader.NamespaceURI == XmlSchema.Namespace)
{
error(h,reader.Name + " is not a valid attribute for keyref",null);
}
else
{
XmlSchemaUtil.ReadUnhandledAttribute(reader,keyref);
}
}
reader.MoveToElement();
if(reader.IsEmptyElement)
return keyref;
// Content: annotation?, selector, field+
int level = 1;
while(reader.ReadNextElement())
{
if(reader.NodeType == XmlNodeType.EndElement)
{
if(reader.LocalName != xmlname)
error(h,"Should not happen :2: XmlSchemaKeyref.Read, name="+reader.Name,null);
break;
}
if(level <= 1 && reader.LocalName == "annotation")
{
level = 2; //Only one annotation
XmlSchemaAnnotation annotation = XmlSchemaAnnotation.Read(reader,h);
if(annotation != null)
keyref.Annotation = annotation;
continue;
}
if(level <= 2 && reader.LocalName == "selector")
{
level = 3;
XmlSchemaXPath selector = XmlSchemaXPath.Read(reader,h,"selector");
if(selector != null)
keyref.Selector = selector;
continue;
}
if(level <= 3 && reader.LocalName == "field")
{
level = 3;
if(keyref.Selector == null)
error(h,"selector must be defined before field declarations",null);
XmlSchemaXPath field = XmlSchemaXPath.Read(reader,h,"field");
if(field != null)
keyref.Fields.Add(field);
continue;
}
reader.RaiseInvalidElementError();
}
return keyref;
}
}
}
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