/// <summary>
/// Actually parses an array, and is used in both short-hand and separate
/// element formats of array specification.
/// </summary>
public static Array ParseArray(string elementTypeName, XmlElement[] childElements, XmlProcessingContext context)
{
context.EnterRunningLocation(string.Format("Array({0})", elementTypeName ?? "object"));
var elementType = typeof(object);
if (elementTypeName != null)
{
elementType = SimpleTypeParserUtil.ParseType(elementTypeName, context);
if (elementType == null)
{
context.ReportError(string.Format("Type '{0}' could not be loaded.", elementTypeName));
return(null);
}
}
var arrayElements = GetCollectionElements(childElements, elementType, context);
var result = Array.CreateInstance(elementType, arrayElements.Count);
for (var i = 0; i < result.Length; i++)
{
result.SetValue(arrayElements[i], i);
}
context.LeaveRunningLocation();
return(result);
}
/// <summary>
/// Actually parses the contents of lists from composition XMLs, and is
/// used in both short-hand form and complete form of list specification.
/// </summary>
public static IList ParseList(string elementTypeName, XmlElement[] childElements, XmlProcessingContext context)
{
context.EnterRunningLocation(string.Format("List({0})", elementTypeName ?? "object"));
var elementType = typeof(object);
if (elementTypeName != null)
{
elementType = SimpleTypeParserUtil.ParseType(elementTypeName, context);
if (elementType == null)
{
context.ReportError(string.Format("Type '{0}' could not be loaded.", elementTypeName));
context.LeaveRunningLocation();
return(null);
}
}
var listElements = GetCollectionElements(childElements, elementType, context);
var listType = Type.GetType(string.Format("System.Collections.Generic.List`1[[{0}]]",
elementType.AssemblyQualifiedName));
var result = (IList)Activator.CreateInstance(listType);
foreach (var o in listElements)
{
result.Add(o);
}
context.LeaveRunningLocation();
return(result);
}
/// <summary>
/// Actually parses the object and returns the result. Used both in short-hand
/// form and in direct Object element parsing.
/// </summary>
public static object ParseObject(string typeName, bool initializePlugs, XmlElement[] childElements,
XmlProcessingContext context)
{
context.EnterRunningLocation(string.Format("Object({0})", typeName));
// Look for constructor arguments.
// Set default to null, so that Activator calls default constructor
// in case the the "ConstructorArgs" element is not specified.
object[] constructorArguments = null;
foreach (var childElement in childElements)
{
if (childElement.Name != "ConstructorArgs")
{
continue;
}
// Check if this is the second "ConstructorArgs" element.
// If so, report an error and return.
if (constructorArguments != null)
{
context.ReportError("The 'ConstructorArgs' element can be specified maximum once in an 'Object' element.");
context.LeaveRunningLocation();
return(null);
}
constructorArguments = ParseConstructorArgs(childElement, context);
context.ThrowIfErrors();
}
// Resolve the "Type" for the object to be instantiated
var objectType = SimpleTypeParserUtil.ParseType(typeName, context);
if (objectType == null)
{
context.ReportError(string.Format("Type '{0}' could not be loaded.", typeName));
context.LeaveRunningLocation();
return(null);
}
// Use Activator class to instantiate the object
var result = Activator.CreateInstance(objectType, constructorArguments);
if (initializePlugs)
{
context.ComponentContext.InitializePlugs(result, objectType);
}
foreach (var childElement in childElements)
{
switch (childElement.Name)
{
case "ConstructorArgs":
break;
case "Property":
ParseObjectProperty(result, childElement, context);
break;
case "Field":
ParseObjectField(result, childElement, context);
break;
default: // Also: case "ConstructorArgs"
context.ReportError(
string.Format("Xml element '{0}' is not allowed in 'Object' element - type: {1}", childElement.Name,
typeName));
context.LeaveRunningLocation();
return(null);
}
}
context.LeaveRunningLocation();
return(result);
}
/// <summary>
/// Actually parses the contents of dictionaries in composition XMLs, and is
/// used for both short-hand and seperate element formats of dictionary specification.
/// </summary>
public static IDictionary ParseDictionary(string keyTypeName, string valueTypeName, XmlElement[] xmlElements,
XmlProcessingContext context)
{
context.EnterRunningLocation(
string.Format("Parse Dictionary({0}, {1})", keyTypeName ?? "object", valueTypeName ?? "object"));
var keyType = typeof(object);
var valueType = typeof(object);
if (keyTypeName != null)
{
keyType = SimpleTypeParserUtil.ParseType(keyTypeName, context);
if (keyType == null)
{
context.ReportError(string.Format("Type '{0}' could not be loaded.", keyTypeName));
context.LeaveRunningLocation();
return(null);
}
}
if (valueTypeName != null)
{
valueType = SimpleTypeParserUtil.ParseType(valueTypeName, context);
if (valueType == null)
{
context.ReportError(string.Format("Type '{0}' could not be loaded.", valueTypeName));
context.LeaveRunningLocation();
return(null);
}
}
var dictionaryType = Type.GetType(string.Format("System.Collections.Generic.Dictionary`2[[{0}],[{1}]]",
keyType.AssemblyQualifiedName,
valueType.AssemblyQualifiedName));
var result = (IDictionary)Activator.CreateInstance(dictionaryType);
for (var i = 0; i < xmlElements.Length; i++)
{
var childElement = xmlElements[i];
if (childElement.Name == "Item")
{
context.EnterRunningLocation(string.Format("Item({0})", i));
ParseDictionaryItem(result, childElement, context);
context.LeaveRunningLocation(); // For Item
}
else
{
context.ReportError(
string.Format("Xml element '{0}' is not allowed in 'Dictionary' element - type: Dictionary<{1}, {2}>",
childElement.Name,
keyType.FullName, valueType.FullName));
context.LeaveRunningLocation();
return(null);
}
}
context.LeaveRunningLocation();
return(result);
}
public static object ParseValue(XmlElement[] elements, XmlAttribute[] attributes,
XmlProcessingContext xmlProcessingContext)
{
// Check if there is any attributes. If there's not,
// go straight into the nested elements.
if ((attributes == null) || (attributes.Length == 0))
{
// There should be only one element for values that do not
// specify anythin by the attributes. Otherwise, throw.
if ((elements == null) || (elements.Length != 1))
{
xmlProcessingContext.ReportError("Exactly one nested element should specify the value.");
return(null);
}
// If the element is okay, just pass it to the element parser.
var element = elements[0];
switch (element.Name)
{
case "Object":
return(ObjectParserUtil.ParseObject(element, xmlProcessingContext));
case "Dictionary":
return(CollectionParserUtil.ParseDictionary(element, xmlProcessingContext));
case "Array":
return(CollectionParserUtil.ParseArray(element, xmlProcessingContext));
case "List":
return(CollectionParserUtil.ParseList(element, xmlProcessingContext));
}
return(SimpleTypeParserUtil.ParseSimpleType(element, xmlProcessingContext));
}
// There are attributes. So, based on the name of the attributes,
// decide who should take responsibility for parsing.
var attributeNames = new List <string>(
Array.ConvertAll(attributes, attribute => attribute.Name));
if (attributeNames.Contains("objectType"))
{
return(ObjectParserUtil.ParseObject(attributes, elements, xmlProcessingContext));
}
if ((attributeNames.Contains("dictionaryKeyType")) || (attributeNames.Contains("dictionaryValueType")))
{
return(CollectionParserUtil.ParseDictionary(attributes, elements, xmlProcessingContext));
}
if (attributeNames.Contains("arrayElementType"))
{
return(CollectionParserUtil.ParseArray(attributes, elements, xmlProcessingContext));
}
return(attributeNames.Contains("listElementType")
? CollectionParserUtil.ParseList(attributes, elements, xmlProcessingContext)
: SimpleTypeParserUtil.ParseSimpleType(attributes, xmlProcessingContext));
}
