/// <summary>
/// 构建插件。
/// </summary>
/// <returns>代表了插件的对象，例如一个UI元素。</returns>
public IAddin Build()
{
AddinBuildState state = BuildState;
switch (state)
{
case AddinBuildState.Build:
return(Addin);
case AddinBuildState.NotBuild:
return(GetInstance());
case AddinBuildState.DependecyFail:
case AddinBuildState.LoadAssemblyFail:
case AddinBuildState.LoadTypeFail:
return(null);
case AddinBuildState.NotAnalysis:
Analysis();
return(GetInstance());
default:
return(null);
}
}
/// <summary>
/// 加载程序集。
/// </summary>
private void LoadAssemblies()
{
AssemblyName aname = null;
String fullName = null;
Collection <String> unresoles = new Collection <String>();
Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
String file = null;
foreach (String reference in References)
{
try
{
file = AddinManager.GetFileFullPath(reference);
aname = AssemblyName.GetAssemblyName(file);
fullName = aname.FullName;
if (assemblies.Any(x => x.FullName == fullName))
{
continue;
}
Assembly.LoadFrom(file);
}
catch (Exception)
{
unresoles.Add(file);
}
}
if (unresoles.Count != 0)
{
BuildState = AddinBuildState.LoadAssemblyFail;
throw new AddinAssembliesException(unresoles.ToArray());
}
}
/// <summary>
/// 创建插件实例。
/// </summary>
/// <returns>插件实例。</returns>
private IAddin GetInstance()
{
IAddin addin = (IAddin)Activator.CreateInstance(_type);
addin.Initialize();
AddinDescriptors.Add(addin, this);
Addin = addin;
InitializeAddinState();
BuildState = AddinBuildState.Build;
return(addin);
}
/// <summary>
/// 销毁插件实例。
/// </summary>
public void Destroy()
{
if (BuildState == AddinBuildState.Build)
{
RemoveDependencies();
AddinDescriptors.Remove(Addin);
Addin.Dispose();
Addin = null;
BuildState = AddinBuildState.NotBuild;
}
}
/// <summary>
/// 解析插件所需程序集列表。
/// </summary>
private void AnalysisAssemblies()
{
if (References == null)
{
return;
}
LoadAssemblies();
Type type = System.Type.GetType(Type,
(n) =>
{
Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
AssemblyName an = null;
for (Int32 i = 0; i < assemblies.Length; i++)
{
an = assemblies[i].GetName();
if (an.Name == n.Name || an.FullName == n.FullName)
{
return(assemblies[i]);
}
}
return(null);
},
(a, s, b) =>
{
Type temp = a.GetType(s);
if (temp == null)
{
BuildState = AddinBuildState.LoadTypeFail;
}
return(temp);
}, true);
if (type.GetInterface(typeof(IAddin).FullName) == null)
{
BuildState = AddinBuildState.LoadTypeFail;
throw new TypeLoadException($"{type.FullName} must implement IAddin interface");
}
AddinAttribute attr = type.GetCustomAttribute <AddinAttribute>();
if (attr == null)
{
BuildState = AddinBuildState.LoadTypeFail;
throw new AddinAttributeException($"{type.FullName} can not find 'AddinAttribute'");
}
if (attr.Guid != Owner.Guid)
{
BuildState = AddinBuildState.LoadTypeFail;
throw new AddinAttributeException($"{type.FullName} guid not match");
}
_type = type;
}
/// <summary>
/// 解析插件的依赖列表。
/// </summary>
private void AnalysisDependencies()
{
if (Dependencies == null)
{
return;
}
Collection <String> unresoles = new Collection <String>();
String dependency = null;
for (Int32 i = 0; i < Dependencies.Length; i++)
{
dependency = Dependencies[i];
IEnumerable <AddinTreeNode> nodes = AddinManager.Instance.GetNode(dependency);
if (nodes == null)
{
unresoles.Add(dependency);
}
}
if (unresoles.Count != 0)
{
BuildState = AddinBuildState.DependecyFail;
throw new AddinDependencyException(unresoles.ToArray());
}
}
/// <summary>
/// 解析依赖，加载程序集和类型。
/// </summary>
private void Analysis()
{
AnalysisAssemblies();
BuildDependencies();
BuildState = AddinBuildState.NotBuild;
}
