package com.atlassian.plugin.webresource;
   
   import static com.atlassian.plugin.webresource.BatchPluginResource.URL_PREFIX;
   
   import com.atlassian.plugin.PluginAccessor;
   import com.atlassian.plugin.cache.filecache.FileCache;
   import com.atlassian.plugin.servlet.DownloadableResource;
   
   import com.atlassian.plugin.webresource.cache.CacheHandle;
  import com.atlassian.plugin.webresource.cache.FileCacheKey;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Map;
  
  /**
   * Produces a batch containing the resources defined in a single web resource module descriptor
   * @since 2.9.0
   */
  class SingleBatchDownloadableResourceBuilder extends AbstractBatchResourceBuilder
  {
      private static final Logger log = LoggerFactory.getLogger(SingleBatchDownloadableResourceBuilder.class);
  
      public SingleBatchDownloadableResourceBuilder(final PluginAccessor pluginAccessor, final WebResourceUrlProvider webResourceUrlProvider,
                                                    final DownloadableResourceFinder resourceFinder, final FileCache<FileCacheKey> cache)
      {
          super(pluginAccessor, webResourceUrlProvider, resourceFinder, cache);
      }
  
      public boolean matches(final String path)
      {
          return path.indexOf(URL_PREFIX) > -1;
      }
  
      public DownloadableResource parse(final String path, final Map<String, String> params) throws UrlParseException
      {
          final String type = ResourceUtils.getType(path);
          final int startIndex = path.indexOf(URL_PREFIX) + URL_PREFIX.length() + 1;
          final String typeAndModuleKey = path.substring(startIndex);
          final String[] parts = typeAndModuleKey.split("/", 2);
  
          if (parts.length < 2)
          {
              throw new UrlParseException("Could not parse invalid batch resource url: " + path);
          }
          final String moduleKey = parts[0];
          final String resourceName = parts[1];
          final BatchDownloadableResource batchResource = new BatchDownloadableResource(moduleKey, type, params,
                  resolve(moduleKey, type, params),
                  CacheHandle.Builder.forRequest(cache, "singlebatch", path, params));
  
          if (log.isDebugEnabled())
          {
              log.debug(batchResource.toString());
          }
  
          if (batchResource.isEmpty())
          {
              return getResourceFinder().find(moduleKey, resourceName);
          }
          return batchResource;
      }
  }