java/src/main/com/google/appengine/tools/development/ExtendedRootResource.java

   1 // Copyright 2012 Google Inc. All Rights Reserved.
   2
   3 package com.google.appengine.tools.development;
   4
   5 import org.mortbay.resource.FileResource;
   6 import org.mortbay.resource.Resource;
   7 import org.mortbay.resource.ResourceCollection;
   8
   9 import java.io.File;
  10
  11 /**
  12  * A {@code Resource} that represents a web root extended to include an external resource directory.
  13  * <p>
  14  * We replace Jetty's baseResource with an instance of this class in order to implement our
  15  * "External Resource Directory" feature.
  16  *
  17  */
  18 public class ExtendedRootResource extends ResourceCollection {
  19   public ExtendedRootResource(Resource webRoot, File externalResourceDir) {
  20     super(new Resource[] {toResource(externalResourceDir), webRoot});
  21   }
  22
  23   private static Resource toResource(File f) {
  24     if (f == null) {
  25       throw new NullPointerException("externalResourceDir may not be null");
  26     }
  27     try {
  28       return new FileResource(f.toURI().toURL());
  29     } catch (Exception e) {
  30       throw new IllegalArgumentException("Invalid externalResourceDirectory: " + f.getPath(), e);
  31     }
  32   }
  33
  34 }