package org.esigate.extension.surrogate.http;
   
   import java.util.ArrayList;
   import java.util.List;
   
   import org.apache.commons.lang3.StringUtils;
   
   /**
    * The Surrogate-Capabilities request header allows surrogates to advertise their capabilities with capability tokens.
   * 
   * @author Nicolas Richeton
   * 
   */
  public final class SurrogateCapabilitiesHeader {
      private List<SurrogateCapabilities> surrogates;
  
      private SurrogateCapabilitiesHeader() {
          surrogates = new ArrayList<>();
      }
  
      public static SurrogateCapabilitiesHeader fromHeaderValue(String value) {
          SurrogateCapabilitiesHeader result = new SurrogateCapabilitiesHeader();
  
          if (value == null) {
              return result;
          }
  
          String[] surrogates = value.split(",");
          for (String surrogate : surrogates) {
              result.surrogates.add(SurrogateCapabilities.fromString(surrogate.trim()));
          }
  
          return result;
      }
  
      public List<SurrogateCapabilities> getSurrogates() {
          return surrogates;
      }
  
      public SurrogateCapabilities getSurrogate(String token) {
          for (SurrogateCapabilities s : surrogates) {
              if (token.equals(s.getDeviceToken())) {
                  return s;
              }
          }
          return null;
      }
  
      @Override
      public String toString() {
  
          return StringUtils.join(surrogates, ", ");
      }
  }