package com.atlassian.plugin.osgi.factory;
   
   import com.atlassian.plugin.ModuleDescriptor;
   import com.atlassian.plugin.ModuleDescriptorFactory;
   import com.atlassian.plugin.PluginParseException;
   import com.atlassian.plugin.descriptors.RequiresRestart;
   import com.atlassian.plugin.descriptors.UnrecognisedModuleDescriptorRequiringRestart;
   
   /**
   * Return placeholder {@link UnrecognisedModuleDescriptor} instances marked with @RequiresRestart
   * for any descriptors in the underlying {@link ModuleDescriptorFactory} that have that annotation. This
   * is for module descriptors that won't be used yet but where we need to report the RequresRestart status
   * back.
   */
  public class UnavailableModuleDescriptorRequiringRestartFallbackFactory implements ModuleDescriptorFactory
  {
      public static final String DESCRIPTOR_TEXT = "Support for this module is not currently installed.";
      private final ModuleDescriptorFactory underlying;
  
      public UnavailableModuleDescriptorRequiringRestartFallbackFactory(ModuleDescriptorFactory underlying)
      {
          this.underlying = underlying;
      }
  
      private boolean requiresRestart(String type)
      {
          if (underlying.hasModuleDescriptor(type))
          {
              return (underlying.getModuleDescriptorClass(type).getAnnotation(RequiresRestart.class) != null);
          }
          else
          {
              return false;
          }
      }
  
      public UnrecognisedModuleDescriptorRequiringRestart getModuleDescriptor(String type) throws PluginParseException, IllegalAccessException,
              InstantiationException, ClassNotFoundException
      {
          if (hasModuleDescriptor(type))
          {
              final UnrecognisedModuleDescriptorRequiringRestart descriptor = new UnrecognisedModuleDescriptorRequiringRestart();
              descriptor.setErrorText(DESCRIPTOR_TEXT);
              return descriptor;
          }
          else
          {
              return null;
          }
      }
  
      public Class<? extends ModuleDescriptor<?>> getModuleDescriptorClass(String type)
      {
          if (hasModuleDescriptor(type))
          {
              return UnrecognisedModuleDescriptorRequiringRestart.class;
          }
          else
          {
              return null;
          }
      }
  
      public boolean hasModuleDescriptor(String type)
      {
          return requiresRestart(type);
      }
  }