codon只是一个xml文件(addin文件中)的一个节点,这个节点须有唯一的名字
以下是一个codon的创建过程,并不包括condtion
以下是调用的程序正常执行步骤的记录
public
class
Addin
...
{
//从addin文件中分析出extension public void Initialize(string fileName)
...{ switch (curEl.Name) ...{ case "Runtime": AddRuntimeLibraries(Path.GetDirectoryName(fileName), curEl); break; case "Extension": AddExtensions(curEl); break;
} } void AddExtensions(XmlElement el) ...{ if (el.Attributes["path"] == null) ...{ throw new AddInLoadException("One extension node has no path attribute defined."); } Extension e = new Extension(el.Attributes["path"].InnerText);//extension的path属性 AddCodonsToExtension(e, el, new ConditionCollection());//调用此函数来实例化,条件,与Icodon extensions.Add(e); } 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": //建立conditional 集合 default: ICodon codon = AddInTreeSingleton.AddInTree.CodonFactory.CreateCodon(this, curEl);//创建类的实例}//调用codonfactorypublic class CodonFactory...{ public ICodon CreateCodon(AddIn addIn, XmlNode codonNode) ...{ CodonBuilder builder = codonHashtable[codonNode.Name] as CodonBuilder; if (builder != null) ...{ return builder.BuildCodon(addIn);//创建类的实例 } throw new CodonNotFoundException(String.Format("no codon builder found for <{0}>", codonNode.Name)); }}//类的condonbuilderpublic class CodonBuilder...{ public ICodon BuildCodon(AddIn addIn) ...{ ICodon codon; try ...{ // create instance (ignore case) codon = (ICodon)assembly.CreateInstance(ClassName, true);//调用assembly来创建类的实例,并转换为icodon接口 // set default values codon.AddIn = addIn; } catch (Exception) ...{ codon = null; } return codon; }}
