package com.atlassian.marketplace.client.api;
   
   import com.atlassian.fugue.Either;
   import com.atlassian.fugue.Option;
   
   import static com.atlassian.fugue.Option.none;
   import static com.atlassian.fugue.Option.some;
   
   /**
   * Encapsulates parameters that can be passed to {@link Products#getVersion}.
   * @since 2.0.0
   */
  public final class ProductVersionSpecifier
  {
      private final Option<Either<Integer, String>> nameOrBuild;
      
      private ProductVersionSpecifier(Option<Either<Integer, String>> nameOrBuild)
      {
          this.nameOrBuild = nameOrBuild;
      }
      
      /**
       * Searches for a product version by build number.
       */
      public static ProductVersionSpecifier buildNumber(int buildNumber)
      {
          return new ProductVersionSpecifier(some(Either.<Integer, String>left(buildNumber)));
      }
  
      /**
       * Searches for a product version by name (version string).
       */
      public static ProductVersionSpecifier name(String name)
      {
          return new ProductVersionSpecifier(some(Either.<Integer, String>right(name)));
      }
  
      /**
       * Searches for the latest version.
       */
      public static ProductVersionSpecifier latest()
      {
          return new ProductVersionSpecifier(Option.<Either<Integer, String>>none());
      }
      
      public Option<Integer> getBuildNumber()
      {
          for (Either<Integer, String> nb: nameOrBuild)
          {
              return nb.left().toOption();
          }
          return none();
      }
  
      public Option<String> getName()
      {
          for (Either<Integer, String> nb: nameOrBuild)
          {
              return nb.right().toOption();
          }
          return none();
      }
  
      @Override
      public String toString()
      {
          for (Integer b: getBuildNumber())
          {
              return "buildNumber(" + b + ")";            
          }
          for (String n: getName())
          {
              return "name(" + n + ")";
          }
          return "latest";
      }
      
      @Override
      public boolean equals(Object other)
      {
          return (other instanceof ProductVersionSpecifier) && ((ProductVersionSpecifier) other).nameOrBuild.equals(this.nameOrBuild);
      }
      
      @Override
      public int hashCode()
      {
          return nameOrBuild.hashCode();
      }
  }