package com.atlassian.plugin.servlet;
   
   import com.atlassian.plugin.Plugin;
   import com.atlassian.plugin.elements.ResourceLocation;
   
   import java.io.IOException;
   import java.io.InputStream;
   
   /**
   * A DownloadableResource with no content
   * @since v3.0
   */
  public class EmptyDownloadableResource extends AbstractDownloadableResource
  {
      private static final InputStream EMPTY_INPUT_STREAM = new EmptyInputStream();
  
      private static class EmptyInputStream extends InputStream
      {
          @Override
          public int read() throws IOException
          {
              return -1;
          }
      }
  
      /**
       * @param plugin used to find last modified date and plugin key
       * @param resourceLocation used to get content type for the resource
       */
      public EmptyDownloadableResource(Plugin plugin, ResourceLocation resourceLocation)
      {
          super(plugin, resourceLocation, null);
      }
  
      @Override
      protected InputStream getResourceAsStream(String resourceLocation)
      {
          return EMPTY_INPUT_STREAM;
      }
  }