void AddCodonsToExtension(Extension e, XmlElement el, ConditionCollection conditions)
{
foreach (object o in el.ChildNodes) {
if (!(o is XmlElement)) {
continue;
}
XmlElement curEl = (XmlElement)o;
switch (curEl.Name) {
case "And": // these nodes are silently ignored.
case "Or":
case "Not":
case "Condition":
break;
case "Conditional":
ICondition condition = null;
// 若当前条件结点的属性个数为零或者(个数为1并且包含action属性),
//则说明当前条件结点为一个复合逻辑条件(即该条件由一些and,or等条件组成)
if (curEl.Attributes.Count == 0 || (curEl.Attributes.Count == 1 && curEl.Attributes["FailedAction"] != null))
{
condition = BuildComplexCondition(curEl);
// set condition action manually
if (curEl.Attributes["FailedAction"] != null)
{
condition.FailedAction = (ConditionFailedAction)Enum.Parse(typeof(ConditionFailedAction), curEl.Attributes["FailedAction"].InnerText);
}
if (condition == null)
{
throw new AddInTreeFormatException("empty conditional, but no condition definition found.");
}
}
else
{ //当前条件结点为一个简单条件结点,该条件结点不会包含<Or>,<And>等子结点
condition = AddInTreeSingleton.AddInTree.ConditionFactory.CreateCondition(this, curEl);
AutoInitializeAttributes(condition, curEl);
}
// put the condition at the end of the condition 'stack'
conditions.Add(condition);
// traverse the subtree
AddCodonsToExtension(e, curEl, conditions);
// now we are back to the old level, remove the condition
// that was applied to the subtree.
conditions.RemoveAt(conditions.Count - 1);
break;
default:
ICodon codon = AddInTreeSingleton.AddInTree.CodonFactory.CreateCodon(this, curEl);
AutoInitializeAttributes(codon, curEl);
// Ensure that the codon is inserted after the codon which is defined
// before in the add-in definition.
// The codons get topologically sorted and if I don't set the InsertAfter they may
// change it's sorting order.
e.Conditions[codon.ID] = new ConditionCollection(conditions);
if (codon.InsertAfter == null && codon.InsertBefore == null && e.CodonCollection.Count > 0) {
codon.InsertAfter = new string[] { ((ICodon)e.CodonCollection[e.CodonCollection.Count - 1]).ID };
}
e.CodonCollection.Add(codon);
if (curEl.ChildNodes.Count > 0) {
Extension newExtension = new Extension(e.Path + '/' + codon.ID);
AddCodonsToExtension(newExtension, curEl, conditions);
extensions.Add(newExtension);
}
break;
}
}
}
