Java 类io.dropwizard.servlets.assets.ResourceURL 实例源码

private CachedPage renderLocalAsset(URL localSourceUrl) throws IOException {
    return new CachedPage(Resources.toByteArray(localSourceUrl),
            ResourceURL.getLastModified(localSourceUrl),
            com.google.common.net.MediaType.CSS_UTF_8.toString());
}

@Override
public Asset load(String key) throws Exception {
  for (Map.Entry<String, String> mapping : resourcePathToUriMappings.entrySet()) {
    if (!key.startsWith(mapping.getValue())) {
      continue;
    }

    Asset asset = loadOverride(key);
    if (asset != null) {
      return asset;
    }

    final String requestedResourcePath =
            SLASHES.trimFrom(key.substring(mapping.getValue().length()));
    final String absolutePath = SLASHES.trimFrom(mapping.getKey() + requestedResourcePath);

    try {
      URL requestedResourceUrl =
          UrlUtil.switchFromZipToJarProtocolIfNeeded(Resources.getResource(absolutePath));
      if (ResourceURL.isDirectory(requestedResourceUrl)) {
        if (indexFilename != null) {
          requestedResourceUrl = Resources.getResource(absolutePath + '/' + indexFilename);
          requestedResourceUrl =
              UrlUtil.switchFromZipToJarProtocolIfNeeded(requestedResourceUrl);
        } else {
          // resource mapped to directory but no index file defined
          continue;
        }
      }

      long lastModified = ResourceURL.getLastModified(requestedResourceUrl);
      if (lastModified < 1) {
        // Something went wrong trying to get the last modified time: just use the current time
        lastModified = System.currentTimeMillis();
      }

      // zero out the millis; the If-Modified-Since header will not have them
      lastModified = (lastModified / 1000) * 1000;
      return new StaticAsset(Resources.toByteArray(requestedResourceUrl), lastModified);
    } catch (IllegalArgumentException expected) {
      // Try another Mapping.
    }
  }

  return null;
}