} // TryReadNext()
//
//
//
// *****************************************************************
// **** Create Node() ****
// *****************************************************************
private bool TryCreateNode(string tagName, ref Dictionary <string, string> attributes, bool createNode, out IStringifiable newNode)
{
newNode = null;
Type objectType;
if (createNode)
{
newNode = new Node(tagName, attributes);
}
else if (Stringifiable.TryGetType(tagName, out objectType))
{
newNode = null;
System.Reflection.MethodInfo methodInfo = objectType.GetMethod("GetInstance");
if (methodInfo != null && methodInfo.IsStatic)
{
newNode = (IStringifiable)methodInfo.Invoke(null, new object[0] {
}) as IStringifiable; // create object using GetInstance()
}
else
{
newNode = (IStringifiable)Activator.CreateInstance(objectType) as IStringifiable; // create object via constructor.
}
if (newNode != null)
{
newNode.SetAttributes(attributes);
}
}
else
{ // TODO: Throw exception?!
throw new Exception(String.Format("Unknown object type {0}", tagName));
//return false;
}
return(true);
}// CreateNode()
//
//
// *******************************************************************
// **** Try Read Next() ****
// *******************************************************************
/// <summary>
/// Method attempts to read (as much XML as needed to create) the next ISerializable object in file stream.
/// This methoc can be called repeatedly to obtain each successive object in file. Returns a false at the end
/// of the file stream.
/// TODO: Implement reflective object creation.
/// </summary>
/// <param name="newObject">Newly created object</param>
/// <param name="createNode">If call is to create stand-in pseudo node object in place of real one.</param>
/// <returns>True signifies sucessful creation of one object, false if at end of file.</returns>
public bool TryReadNext(out IStringifiable newObject, bool createNode = false)
{
newObject = null;
List <IStringifiable> parentNodes = new List <IStringifiable>(); // each time a new instrument is created, we move down another level of depth.
IStringifiable aNode = null;
string tagName;
TagType tagType;
Type objectType;
Dictionary <string, string> attributes = new Dictionary <string, string>();
while (TryReadNextTag(out tagName, out tagType, ref attributes))
{
switch (tagType)
{
case TagType.StartTag:
if (!TryCreateNode(tagName, ref attributes, createNode, out aNode))
{
return(false);
}
if (parentNodes.Count > 0)
{
parentNodes[parentNodes.Count - 1].AddSubElement(aNode); // Connect this node to it's parent node.
}
parentNodes.Add(aNode); // Push this object onto parent list, in case we next read a child object.
break;
case TagType.EndTag:
aNode = parentNodes[parentNodes.Count - 1]; // Get the current parent node
if (createNode && tagName == ((Node)aNode).Name) //
{
parentNodes.RemoveAt(parentNodes.Count - 1); // pop out last, since we finished it
}
else if (Stringifiable.TryGetType(tagName, out objectType) && tagName.Equals(objectType.FullName))
{
parentNodes.RemoveAt(parentNodes.Count - 1); // pop out last, since we finished it
}
else
{ // Error! Throw exception?
return(false);
}
// Check exit condition.
if (parentNodes.Count == 0)
{
newObject = aNode;
return(true);
}
break;
case TagType.CompleteTag:
if (!TryCreateNode(tagName, ref attributes, createNode, out aNode))
{
return(false);
}
if (parentNodes.Count == 0) // Check exit condition
{
newObject = aNode;
return(true); // This zero-depth object is complete! We are done!
}
else
{
parentNodes[parentNodes.Count - 1].AddSubElement(aNode); // connect this to its parent.
}
break;
case TagType.Comment:
break;
case TagType.None:
break;
default:
break;
}// tagType
//
attributes.Clear();
} // wend
parentNodes = null;
newObject = null;
return(false);
} // TryReadNext()
