protected override EventPropertyGetter DoResolvePropertyGetter(String propertyExpression)
{
var getter = _propertyGetterCache.Get(propertyExpression);
if (getter != null)
{
return(getter);
}
if (!ConfigurationEventTypeXMLDOM.IsXPathPropertyExpr)
{
var prop = PropertyParser.ParseAndWalkLaxToSimple(propertyExpression);
getter = prop.GetGetterDOM();
if (!prop.IsDynamic)
{
getter = new DOMConvertingGetter(propertyExpression, (DOMPropertyGetter)getter, typeof(string));
}
}
else
{
try
{
var ast = PropertyParser.Parse(propertyExpression);
var isDynamic = PropertyParser.IsPropertyDynamic(ast);
var xPathExpr = SimpleXMLPropertyParser.Walk(
ast,
propertyExpression,
RootElementName,
_defaultNamespacePrefix,
_isResolvePropertiesAbsolute);
if (Log.IsInfoEnabled)
{
Log.Info("Compiling XPath expression for property '" + propertyExpression + "' as '" + xPathExpr +
"'");
}
var xPathExpression = XPathExpression.Compile(xPathExpr, NamespaceContext);
var xPathReturnType = isDynamic ? XPathResultType.Any : XPathResultType.String;
getter = new XPathPropertyGetter(
propertyExpression,
xPathExpr,
xPathExpression,
xPathReturnType,
null,
null);
}
catch (XPathException e)
{
throw new EPException(
"Error constructing XPath expression from property name '" + propertyExpression + '\'', e);
}
}
// no fragment factory, fragments not allowed
_propertyGetterCache.Put(propertyExpression, getter);
return(getter);
}
/// <summary>
/// Set the preconfigured event properties resolved by XPath expression.
/// </summary>
/// <param name="explicitXPathProperties">are preconfigured event properties</param>
/// <param name="additionalSchemaProperties">the explicit properties</param>
protected void Initialize(ICollection <ConfigurationEventTypeXMLDOM.XPathPropertyDesc> explicitXPathProperties,
IList <ExplicitPropertyDescriptor> additionalSchemaProperties)
{
// make sure we override those explicitly provided with those derived from a metadataz
var namedProperties = new LinkedHashMap <String, ExplicitPropertyDescriptor>();
foreach (ExplicitPropertyDescriptor desc in additionalSchemaProperties)
{
namedProperties[desc.Descriptor.PropertyName] = desc;
}
String xPathExpression = null;
try
{
foreach (ConfigurationEventTypeXMLDOM.XPathPropertyDesc property in explicitXPathProperties)
{
xPathExpression = property.XPath;
if (Log.IsInfoEnabled)
{
Log.Info("Compiling XPath expression for property '" + property.Name + "' as '" +
xPathExpression + "'");
}
var expressionContext = NamespaceContext ?? GetExtendedContext();
var expression = XPathExpression.Compile(xPathExpression, expressionContext);
FragmentFactoryXPathPredefinedGetter fragmentFactory = null;
var isFragment = false;
if (property.OptionalEventTypeName != null)
{
fragmentFactory = new FragmentFactoryXPathPredefinedGetter(
EventAdapterService,
property.OptionalEventTypeName,
property.Name);
isFragment = true;
}
var getter = new XPathPropertyGetter(
property.Name,
xPathExpression,
expression,
property.ResultType,
property.OptionalCastToType,
fragmentFactory);
var returnType = SchemaUtil.ToReturnType(
property.ResultType,
property.OptionalCastToType.GetBoxedType());
var indexType = returnType.GetIndexType();
var isIndexed = indexType != null;
if (property.ResultType == XPathResultType.NodeSet)
{
isIndexed = true;
}
var desc = new EventPropertyDescriptor(
property.Name, returnType, indexType, false, false,
isIndexed, false, isFragment);
var @explicit = new ExplicitPropertyDescriptor(
desc, getter, isIndexed,
property.OptionalEventTypeName);
namedProperties[desc.PropertyName] = @explicit;
}
}
catch (XPathException ex)
{
throw new EPException(
"XPath expression could not be compiled for expression '" + xPathExpression + '\'', ex);
}
Initialize(namedProperties.Values);
// evaluate start and end timestamp properties if any
_startTimestampPropertyName = ConfigurationEventTypeXMLDOM.StartTimestampPropertyName;
_endTimestampPropertyName = ConfigurationEventTypeXMLDOM.EndTimestampPropertyName;
EventTypeUtility.ValidateTimestampProperties(this, _startTimestampPropertyName, _endTimestampPropertyName);
}