package com.atlassian.plugin.webresource;
   
   import com.atlassian.plugin.servlet.DownloadableResource;
   
   import java.util.Arrays;
   import java.util.Map;
   
   import static com.atlassian.plugin.webresource.SuperBatchPluginResource.URL_PREFIX;
   
  /**
   * Provides a fallback to serve resources relative to a super batch resource
   * In practice, the resources url should be transformed via the
   * {{com.atlassian.plugin.webresource.RelativeURLTransformResource}}.
   * This builder is in place in case this does not happen
   * @since 2.9.0
   */
  public class SuperBatchSubResourceBuilder implements DownloadableResourceBuilder
  {
      private final ResourceDependencyResolver dependencyResolver;
      private final DownloadableResourceFinder resourceFinder;
  
      public SuperBatchSubResourceBuilder(ResourceDependencyResolver dependencyResolver, DownloadableResourceFinder resourceFinder)
      {
          this.dependencyResolver = dependencyResolver;
          this.resourceFinder = resourceFinder;
      }
  
      public boolean matches(String path)
      {
          return path.indexOf(URL_PREFIX) > -1;
      }
  
      public DownloadableResource parse(String path, Map<String, String> params) throws UrlParseException
      {
          String resourceName = getResourceName(path);
  
          for (WebResourceModuleDescriptor moduleDescriptor : dependencyResolver.getSuperBatchDependencies())
          {
              DownloadableResource resource = resourceFinder.find(moduleDescriptor.getCompleteKey(), resourceName);
  
              if (resource != null)
              {
                  return resource;
              }
          }
  
          return null; // 404
      }
  
      private String getResourceName(String path)
      {
          int startIndex = path.indexOf(URL_PREFIX) + URL_PREFIX.length();
          return path.substring(startIndex);
      }
  }