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    * You may obtain a copy of the License at
   *
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   * distributed under the License is distributed on an "AS IS" BASIS,
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  package io.wcm.handler.mediasource.ngdm.impl.metadata;
  
  import static io.wcm.handler.mediasource.ngdm.impl.NextGenDynamicMediaConfigService.PLACEHOLDER_ASSET_ID;
  
  import org.apache.commons.lang3.StringUtils;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import io.wcm.handler.mediasource.ngdm.impl.NextGenDynamicMediaConfigService;
  import io.wcm.handler.mediasource.ngdm.impl.NextGenDynamicMediaReference;
  
  /**
   * Builds URL to reference a asset metadata via NextGen Dynamic Media.
   *
   * <p>
   * Example URL that might be build:
   * https://host/adobe/assets/urn:aaid:aem:12345678-abcd-abcd-abcd-abcd12345678/metadata
   * </p>
   */
  final class NextGenDynamicMediaMetadataUrlBuilder {
  
    private final NextGenDynamicMediaConfigService config;
  
    /**
     * @param config Config
     */
    NextGenDynamicMediaMetadataUrlBuilder(@NotNull NextGenDynamicMediaConfigService config) {
      this.config = config;
    }
  
    /**
     * Builds the URL for metadata.
     * @return URL or null if invalid/not possible
     */
    public @Nullable String build(@NotNull NextGenDynamicMediaReference reference) {
  
      // get parameters from nextgen dynamic media config for URL parameters
      String repositoryId;
      if (reference.isLocal()) {
        repositoryId = config.getLocalAssetsRepositoryId();
      }
      else {
        repositoryId = config.getRemoteAssetsRepositoryId();
      }
      String metadataPath = config.getAssetMetadataPath();
      if (StringUtils.isAnyEmpty(repositoryId, metadataPath)) {
        return null;
      }
  
      // replace placeholders in delivery path
      metadataPath = StringUtils.replace(metadataPath, PLACEHOLDER_ASSET_ID, reference.getAssetId());
  
      // build URL
      StringBuilder url = new StringBuilder();
      if (StringUtils.startsWith(repositoryId, "localhost:")) {
        // switch to HTTP for unit tests/local testing
        url.append("http");
      }
      else {
        url.append("https");
      }
      url.append("://")
          .append(repositoryId)
          .append(metadataPath);
      return url.toString();
    }
  
  }