/// <summary>
/// Creates a new instance of the ValidationEvaluator containing the
/// the validation schema and a specific XML document to be validated.
/// </summary>
/// <param name="schema">Validation schema. Must not be null.</param>
/// <param name="xInstance">An instance of an XML document to be validated.
/// Must not be null.</param>
/// <param name="fullValidation">Indicates whether to validate the
/// whole document regardless of any assertion, or to stop validation at
/// the first assertion.</param>
public ValidationEvaluator(Schema schema, XDocument xInstance, bool fullValidation)
{
this.schema = schema;
this.xInstance = xInstance;
this.fullValidation = fullValidation;
this.xNavigator = xInstance.CreateNavigator();
}
/// <summary>
/// Converts a schema from the XML form (XDocument) to the internal
/// representation (Schema).
/// </summary>
/// <param name="xSchema">Schema in serialized XML form. Must not be null.</param>
/// <param name="nsManager">Namespace manager. Must not be null.</param>
/// <returns>Schema in internal representation (Schema)</returns>
/// <exception cref="ArgumentNullException" />
public static Schema Deserialize(XDocument xSchema, XmlNamespaceManager nsManager)
{
if (xSchema == null)
{
throw new ArgumentNullException("xSchema");
}
if (nsManager == null)
{
throw new ArgumentNullException("nsManager");
}
Schema schema = new Schema();
schema.Namespaces = DeserializeNamespaces(xSchema.Root, nsManager);
schema.Patterns = DeserializePatterns(xSchema.Root, nsManager);
return schema;
}
/// <summary>
/// Compiles XPath expressions in schema patterns.
/// </summary>
/// <remarks>
/// The XPath expression are compiled in place inside the schema.
/// </remarks>
/// <param name="schema">Schema which contains the expressions to be
/// compiled</param>
/// <exception cref="SyntaxException">Thrown if any of the expressions
/// does not conform to XPath 1.0. The exceptions may contain multiple
/// error messages.</exception>
private static void CompileXPathExpressions(Schema schema)
{
List<string> messages = new List<string>();
// resolve namespaces
XmlNamespaceManager nsManager = new XmlNamespaceManager(new NameTable());
foreach (Namespace ns in schema.Namespaces)
{
nsManager.AddNamespace(ns.Prefix, ns.Uri);
}
// compile XPath expressions
foreach (Pattern pattern in schema.Patterns)
{
// compile contexts
foreach (Rule rule in pattern.Rules)
{
// alter xpath context
string context = rule.Context;
if (context.Length > 0 && context[0] != '/')
{
context = String.Concat("//", context);
}
try
{
rule.CompiledContext = System.Xml.XPath.XPathExpression.Compile(context, nsManager);
}
catch (XPathException e)
{
messages.Add(String.Format("Invalid XPath 1.0 context='{0}': {1}", rule.Context, e.Message));
}
// compile tests
foreach (Assert assert in rule.Asserts)
{
try
{
assert.CompiledTest = System.Xml.XPath.XPathExpression.Compile(assert.Test, nsManager);
}
catch (XPathException e)
{
messages.Add(String.Format("Invalid XPath 1.0 test='{0}': {1}", assert.Test, e.Message));
}
// compile diagnostics
if (assert.Diagnostics.Length > 0)
{
assert.CompiledDiagnostics = new XPathExpression[assert.Diagnostics.Length];
for (int i = 0; i < assert.Diagnostics.Length; i++)
{
string diag = assert.Diagnostics[i];
try
{
assert.CompiledDiagnostics[i] = XPathExpression.Compile(diag);
}
catch (XPathException e)
{
if (assert.DiagnosticsIsValueOf[i])
{
messages.Add(String.Format("Invalid XPath 1.0 select='{0}': {1}", diag, e.Message));
}
else
{
messages.Add(String.Format("Invalid XPath 1.0 path='{0}']: {1}", diag, e.Message));
}
}
}
}
}
}
}
// syntax errors
if (messages.Count > 0)
{
throw new SyntaxException(messages);
}
}