/// <summary>
/// Return the xPath corresponding to the given property. The PropertyName String
/// may be simple, nested, indexed or mapped.
/// </summary>
/// <param name="propertyName">is the event property name</param>
/// <param name="namespace">is the default namespace</param>
/// <param name="schemaModel">is the schema model</param>
/// <param name="xPathContext">is the xpath factory instance to use</param>
/// <param name="rootElementName">is the name of the root element</param>
/// <param name="eventAdapterService">for type lookup and creation</param>
/// <param name="xmlEventType">the resolving type</param>
/// <param name="isAllowFragment">whether fragmenting is allowed</param>
/// <param name="defaultNamespace">default namespace</param>
/// <returns>
/// xpath expression
/// </returns>
/// <throws>EPException is there are XPath errors</throws>
public static EventPropertyGetter GetXPathResolution(String propertyName,
XPathNamespaceContext xPathContext,
String rootElementName,
String @namespace,
SchemaModel schemaModel,
EventAdapterService eventAdapterService,
BaseXMLEventType xmlEventType,
bool isAllowFragment,
String defaultNamespace)
{
if (Log.IsDebugEnabled)
{
Log.Debug("Determining XPath expression for property '" + propertyName + "'");
}
var ctx = new XPathNamespaceContext();
var namespaces = schemaModel.Namespaces;
string defaultNamespacePrefix = null;
for (int i = 0; i < namespaces.Count; i++)
{
var namespacePrefix = "n" + i;
ctx.AddNamespace(namespacePrefix, namespaces[i]);
if ((defaultNamespace != null) && (defaultNamespace == namespaces[i]))
{
defaultNamespacePrefix = namespacePrefix;
}
}
Property property = PropertyParser.ParseAndWalk(propertyName);
var isDynamic = property.IsDynamic;
var rootComplexElement = SchemaUtil.FindRootElement(schemaModel, @namespace, rootElementName);
string prefix = ctx.LookupPrefix(rootComplexElement.Namespace);
if (prefix == null)
{
prefix = "";
}
else
{
prefix += ':';
}
var xPathBuf = new StringBuilder();
xPathBuf.Append('/');
xPathBuf.Append(prefix);
if (rootElementName.StartsWith("//"))
{
xPathBuf.Append(rootElementName.Substring(2));
}
else
{
xPathBuf.Append(rootElementName);
}
var parentComplexElement = rootComplexElement;
Pair <String, XPathResultType> pair = null;
if (!(property is NestedProperty))
{
pair = MakeProperty(rootComplexElement, property, ctx, true, isDynamic, defaultNamespacePrefix);
if (pair == null)
{
throw new PropertyAccessException("Failed to locate property '" + propertyName + "' in schema");
}
xPathBuf.Append(pair.First);
}
else
{
NestedProperty nestedProperty = (NestedProperty)property;
int indexLast = nestedProperty.Properties.Count - 1;
for (int i = 0; i < indexLast + 1; i++)
{
var isLast = i == indexLast;
var propertyNested = nestedProperty.Properties[i];
pair = MakeProperty(parentComplexElement, propertyNested, ctx, isLast, isDynamic, defaultNamespacePrefix);
if (pair == null)
{
throw new PropertyAccessException("Failed to locate property '" + propertyName + "' nested property part '" + property.PropertyNameAtomic + "' in schema");
}
var text = propertyNested.PropertyNameAtomic;
var obj = SchemaUtil.FindPropertyMapping(parentComplexElement, text);
if (obj is SchemaElementComplex)
{
parentComplexElement = (SchemaElementComplex)obj;
}
xPathBuf.Append(pair.First);
}
}
var xPath = xPathBuf.ToString();
if ((ExecutionPathDebugLog.IsEnabled) && (Log.IsDebugEnabled))
{
Log.Debug(".parse XPath for property '" + propertyName + "' is expression=" + xPath);
}
// Compile assembled XPath expression
if (Log.IsDebugEnabled)
{
Log.Debug("Compiling XPath expression '" + xPath + "' for property '" + propertyName + "' using namespace context :" + ctx);
}
XPathExpression expr;
try
{
expr = XPathExpression.Compile(xPath, ctx);
}
catch (XPathException e) {
String detail = "Error constructing XPath expression from property expression '" + propertyName + "' expression '" + xPath + "'";
if (e.Message != null)
{
throw new EPException(detail + " :" + e.Message, e);
}
throw new EPException(detail, e);
}
// get type
var item = property.GetPropertyTypeSchema(rootComplexElement, eventAdapterService);
if ((item == null) && (!isDynamic))
{
return(null);
}
var resultType = isDynamic ? typeof(XmlNode) : SchemaUtil.ToReturnType(item);
FragmentFactory fragmentFactory = null;
if (isAllowFragment)
{
fragmentFactory = new FragmentFactoryDOMGetter(eventAdapterService, xmlEventType, propertyName);
}
return(new XPathPropertyGetter(propertyName, xPath, expr, pair.Second, resultType, fragmentFactory));
}
/// <summary>
/// Ctor.
/// </summary>
/// <param name="eventTypeMetadata">event type metadata</param>
/// <param name="eventTypeId">The event type id.</param>
/// <param name="config">configuration for type</param>
/// <param name="schemaModel">the schema representation</param>
/// <param name="eventAdapterService">type lookup and registration</param>
public SchemaXMLEventType(EventTypeMetadata eventTypeMetadata, int eventTypeId, ConfigurationEventTypeXMLDOM config, SchemaModel schemaModel, EventAdapterService eventAdapterService)
: base(eventTypeMetadata, eventTypeId, config, eventAdapterService)
{
_propertyGetterCache = new Dictionary <String, EventPropertyGetter>();
_schemaModel = schemaModel;
_rootElementNamespace = config.RootElementNamespace;
_schemaModelRoot = SchemaUtil.FindRootElement(schemaModel, _rootElementNamespace, RootElementName);
_isPropertyExpressionXPath = config.IsXPathPropertyExpr;
// Set of namespace context for XPath expressions
var ctx = new XPathNamespaceContext();
if (config.DefaultNamespace != null)
{
ctx.SetDefaultNamespace(config.DefaultNamespace);
}
foreach (var entry in config.NamespacePrefixes)
{
ctx.AddNamespace(entry.Key, entry.Value);
}
NamespaceContext = ctx;
// add properties for the root element
var additionalSchemaProps = new List <ExplicitPropertyDescriptor>();
// Add a property for each complex child element
foreach (SchemaElementComplex complex in _schemaModelRoot.ComplexElements)
{
var propertyName = complex.Name;
var returnType = typeof(XmlNode);
Type propertyComponentType = null;
if (complex.OptionalSimpleType != null)
{
returnType = SchemaUtil.ToReturnType(complex);
}
if (complex.IsArray)
{
// We use XmlNode[] for arrays and NodeList for XPath-Expressions returning Nodeset
returnType = typeof(XmlNode[]);
propertyComponentType = typeof(XmlNode);
}
bool isFragment = false;
if (ConfigurationEventTypeXMLDOM.IsAutoFragment && (!ConfigurationEventTypeXMLDOM.IsXPathPropertyExpr))
{
isFragment = CanFragment(complex);
}
var indexType = returnType.GetIndexType();
var isIndexed = indexType != null;
var getter = DoResolvePropertyGetter(propertyName, true);
var desc = new EventPropertyDescriptor(propertyName, returnType, indexType, false, false, isIndexed, false, isFragment);
var @explicit = new ExplicitPropertyDescriptor(desc, getter, false, null);
additionalSchemaProps.Add(@explicit);
}
// Add a property for each simple child element
foreach (SchemaElementSimple simple in _schemaModelRoot.SimpleElements)
{
var propertyName = simple.Name;
var returnType = SchemaUtil.ToReturnType(simple);
var getter = DoResolvePropertyGetter(propertyName, true);
var indexType = returnType.GetIndexType();
var isIndexed = indexType != null;
var desc = new EventPropertyDescriptor(propertyName, returnType, indexType, false, false, isIndexed, false, false);
var @explicit = new ExplicitPropertyDescriptor(desc, getter, false, null);
additionalSchemaProps.Add(@explicit);
}
// Add a property for each attribute
foreach (SchemaItemAttribute attribute in _schemaModelRoot.Attributes)
{
var propertyName = attribute.Name;
var returnType = SchemaUtil.ToReturnType(attribute);
var getter = DoResolvePropertyGetter(propertyName, true);
var indexType = returnType.GetIndexType();
var isIndexed = indexType != null;
var desc = new EventPropertyDescriptor(propertyName, returnType, indexType, false, false, isIndexed, false, false);
var @explicit = new ExplicitPropertyDescriptor(desc, getter, false, null);
additionalSchemaProps.Add(@explicit);
}
// Finally add XPath properties as that may depend on the rootElementNamespace
Initialize(config.XPathProperties.Values, additionalSchemaProps);
}
