private ObjectDefinition GetObjectDefinition(XmlElement rootElement, XmlElement element, string id)
{
ObjectDefinition objectDefinition = new ObjectDefinition();
// Read the id
if (element.HasAttribute("id"))
{
objectDefinition.Id = element.GetAttribute("id");
}
else
{
throw new ConfigurationErrorsException("The id attribute is required for all configured object elements.");
}
// Read the type
if (element.HasAttribute("type"))
{
objectDefinition.Type = Type.GetType(element.GetAttribute("type"), true);
}
else
{
throw new ConfigurationErrorsException("The typeName attribute is required for all configured object elements.");
}
// Read the singleton flag
if (element.HasAttribute("singleton"))
{
if (element.GetAttribute("singleton") == "true")
{
objectDefinition.IsSingleton = true;
}
}
if (element.HasChildNodes)
{
// Read the constructor information
XmlElement constructorElement = (XmlElement) element.SelectSingleNode("constructor");
if (constructorElement != null && constructorElement.HasChildNodes)
{
foreach (XmlElement parameterElement in constructorElement.SelectNodes("parameter"))
{
object parameterValue;
// Is the parameter a reference to another object?
if (parameterElement.HasAttribute("reference"))
{
if (objectDefinitions.ContainsKey(parameterElement.GetAttribute("reference")))
{
parameterValue = objectDefinitions[parameterElement.GetAttribute("reference")];
}
else
{
string referenceId = parameterElement.GetAttribute("reference");
XmlElement referenceElement = (XmlElement) rootElement.SelectSingleNode("object[@id = '" + referenceId + "']");
ObjectDefinition referenceDefinition = GetObjectDefinition(rootElement, referenceElement, referenceId);
objectDefinitions.Add(referenceDefinition.Id, referenceDefinition);
parameterValue = referenceDefinition;
}
}
else
{
if (parameterElement.HasAttribute("value"))
{
parameterValue = parameterElement.GetAttribute("value");
}
else
{
throw new ConfigurationErrorsException("The value attribute is required for all configured constructor arguments.");
}
}
objectDefinition.ConstructorParameters.Add(parameterValue);
}
}
// Read the property information
foreach (XmlElement propertyElement in element.SelectNodes("property"))
{
string propertyName;
if (propertyElement.HasAttribute("name"))
{
propertyName = propertyElement.GetAttribute("name");
}
else
{
throw new ConfigurationErrorsException("The name attribute is required for all configured properties.");
}
// Is the parameter a reference to another object?
object propertyValue;
if (propertyElement.HasAttribute("reference"))
{
if (objectDefinitions.ContainsKey(propertyElement.GetAttribute("reference")))
{
propertyValue = objectDefinitions[propertyElement.GetAttribute("reference")];
}
else
{
string referenceId = propertyElement.GetAttribute("reference");
XmlElement referenceElement = (XmlElement) rootElement.SelectSingleNode("object[@id = '" + referenceId + "']");
ObjectDefinition referenceDefinition = GetObjectDefinition(rootElement, referenceElement, referenceId);
objectDefinitions.Add(referenceDefinition.Id, referenceDefinition);
propertyValue = referenceDefinition;
}
}
else
{
if (propertyElement.HasAttribute("value"))
{
propertyValue = propertyElement.GetAttribute("value");
}
else
{
throw new ConfigurationErrorsException("The value attribute is required for all configured properties.");
}
}
objectDefinition.Properties.Add(propertyName, propertyValue);
}
}
return objectDefinition;
}
/// <summary>
/// Creates an object instance based on the specified object definition.
/// </summary>
/// <param name="objectDefinition">The definition of the object to create.</param>
/// <returns>An instance based on the specified object definition.</returns>
private static object GetObject(ObjectDefinition objectDefinition)
{
object instance = null;
FormatterConverter formatterConverter = new FormatterConverter();
if (objectDefinition.ConstructorParameters.Count > 0)
{
ConstructorInfo[] constructors = objectDefinition.Type.GetConstructors(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
foreach (ConstructorInfo constructorInfo in constructors)
{
ParameterInfo[] constructorParameters = constructorInfo.GetParameters();
if (constructorParameters.Length == objectDefinition.ConstructorParameters.Count)
{
bool match = true;
for (int i = 0; i < constructorParameters.Length; i++)
{
if (objectDefinition.ConstructorParameters[i] is ObjectDefinition)
{
ObjectDefinition constructorParameterDefinition = (ObjectDefinition) objectDefinition.ConstructorParameters[i];
if (constructorParameters[i].ParameterType != constructorParameterDefinition.Type)
{
match = false;
break;
}
}
else if (constructorParameters[i].ParameterType != objectDefinition.ConstructorParameters[i].GetType())
{
match = false;
break;
}
}
if (match)
{
List<object> parameters = new List<object>();
for (int i = 0; i < objectDefinition.ConstructorParameters.Count; i++)
{
object parameter = objectDefinition.ConstructorParameters[i];
if (parameter is ObjectDefinition)
{
ObjectDefinition parameterDefinition = (ObjectDefinition) parameter;
parameters.Add(GetObject(parameterDefinition));
}
else
{
parameter = formatterConverter.Convert(parameter, constructorParameters[i].ParameterType);
parameters.Add(parameter);
}
}
instance = constructorInfo.Invoke(parameters.ToArray());
break;
}
}
}
}
else
{
instance = Activator.CreateInstance(objectDefinition.Type);
}
if (instance == null)
{
throw new ArgumentException("A match could not be found for the specified ObjectDefinition [" + objectDefinition.Id + "]. Please verify the class definition and the configured constructor information.");
}
else
{
if (objectDefinition.Properties.Count > 0)
{
foreach (PropertyInfo propertyInfo in objectDefinition.Type.GetProperties())
{
object propertyValue = objectDefinition.Properties[propertyInfo.Name];
if (propertyValue != null)
{
if (propertyValue is ObjectDefinition)
{
propertyValue = GetObject(propertyValue as ObjectDefinition);
}
propertyInfo.SetValue(instance, formatterConverter.Convert(propertyValue, propertyInfo.PropertyType), null);
}
}
}
return instance;
}
}
