content: package org.openstack4j.model.storage.block.options;
  
  import com.google.common.collect.Lists;
  import org.openstack4j.model.common.functions.RangesToHeaderNameValue;
  import org.openstack4j.model.common.header.HeaderNameValue;
  import org.openstack4j.model.common.header.IfCondition;
  import org.openstack4j.model.common.header.Range;
  
  import java.util.List;
  
  /**
   * Download options used to determine how the data is returned or if it is returned depending on various conditional
   * options
   *
   * @author Jeremy Unruh
   */
  public class DownloadOptions {
  
      List<HeaderNameValue> headers = Lists.newArrayList();
  
      private DownloadOptions() {
      }
  
      public static DownloadOptions create() {
          return new DownloadOptions();
      }
  
      /**
       * Download select ranges of bytes
       *
       * @param ranges one or more Range objects
       * @return DownloadOptions for method chaining
       */
      public DownloadOptions range(Range... ranges) {
          HeaderNameValue h = RangesToHeaderNameValue.INSTANCE.apply(ranges);
          if (h != null)
              headers.add(h);
          return this;
      }
  
      /**
       * Adds a user specified header name and value
       *
       * @param name  the header name
       * @param value the header value
       * @return DownloadOptions for method chaining
       */
      public DownloadOptions header(String name, Object value) {
          if (name != null) {
              headers.add(new HeaderNameValue(name, value));
          }
          return this;
      }
  
      /**
       * Adds one or more If based conditions to the header chain to offer conditional matching
       * before the data is streamed
       *
       * @param condition one or more IfCondition objects
       * @return DownloadOptions for method chaining
       * @see http://www.ietf.org/rfc/rfc2616.txt
       */
      public DownloadOptions conditions(IfCondition... condition) {
          if (condition != null) {
              for (IfCondition c : condition)
                  headers.add(c.toHeader());
          }
          return this;
      }
  
      /**
       * @return all headers configured from this options object
       */
      public List<HeaderNameValue> getHeaders() {
          return headers;
      }
  }
  