source: branches/3.3-Hive/sources/HeuristicLab.Hive/HeuristicLab.Hive.JobBase/3.3/PluginUtil.cs @ 4368

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.Hive.JobBase {
  public static class PluginUtil {
    #region Required Plugin Search
    
    /// <summary>
    /// Returns a list of plugins in which the type itself and all members 
    /// of the type are declared. Objectgraph is searched recursively.
    /// </summary>
    public static IEnumerable<IPluginDescription> GetDeclaringPlugins(Type type) {
      HashSet<Type> types = new HashSet<Type>();
      FindTypes(type, types, "HeuristicLab.");
      return GetDeclaringPlugins(types);
    }

    /// <summary>
    /// Returns the plugins (including dependencies) in which the given types are declared
    /// </summary>
    public static IEnumerable<IPluginDescription> GetDeclaringPlugins(IEnumerable<Type> types) {
      HashSet<IPluginDescription> plugins = new HashSet<IPluginDescription>();
      foreach (Type t in types) {
        FindDeclaringPlugins(ApplicationManager.Manager.GetDeclaringPlugin(t), plugins);
      }
      return plugins;
    }

    /// <summary>
    /// Finds the dependencies of the given plugin and adds it to the plugins hashset.
    /// Also searches the dependencies recursively.
    /// </summary>
    public static void FindDeclaringPlugins(IPluginDescription plugin, HashSet<IPluginDescription> plugins) {
      if (!plugins.Contains(plugin)) {
        plugins.Add(plugin);
        foreach (IPluginDescription dependency in plugin.Dependencies) {
          FindDeclaringPlugins(dependency, plugins);
        }
      }
    }

    /// <summary>
    /// Recursively finds all types used in type which are in a namespace which starts with namespaceStart
    /// Be aware that search is not performed on attributes
    /// </summary>
    /// <param name="type">the type to be searched</param>
    /// <param name="types">found types will be stored there, needed in order to avoid duplicates</param>
    /// <param name="namespaceStart">only types from namespaces which start with this will be searched and added</param>
    public static void FindTypes(Type type, HashSet<Type> types, string namespaceStart) {
      if (!types.Contains(type) && type.Namespace.StartsWith(namespaceStart)) {
        types.Add(type);

        // constructors
        foreach (ConstructorInfo info in type.GetConstructors()) {
          foreach (ParameterInfo paramInfo in info.GetParameters()) {
            FindTypes(paramInfo.ParameterType, types, namespaceStart);
          }
        }

        // interfaces
        foreach (Type t in type.GetInterfaces()) {
          FindTypes(t, types, namespaceStart);
        }

        // events
        foreach (EventInfo info in type.GetEvents()) {
          FindTypes(info.EventHandlerType, types, namespaceStart);
          FindTypes(info.DeclaringType, types, namespaceStart);
        }

        // properties
        foreach (PropertyInfo info in type.GetProperties()) {
          FindTypes(info.PropertyType, types, namespaceStart);
        }

        // fields
        foreach (FieldInfo info in type.GetFields()) {
          FindTypes(info.FieldType, types, namespaceStart);
        }

        // methods
        foreach (MethodInfo info in type.GetMethods()) {
          foreach (ParameterInfo paramInfo in info.GetParameters()) {
            FindTypes(paramInfo.ParameterType, types, namespaceStart);
          }
          FindTypes(info.ReturnType, types, namespaceStart);
        }
      }
    }
    #endregion
  }
}