code: public DescribeDirectoriesRequest withDirectoryIds(String... directoryIds) {
          if (this.directoryIds == null) {
              setDirectoryIds(new com.amazonaws.internal.SdkInternalList<String>(directoryIds.length));
          }
          for (String ele : directoryIds) {
              this.directoryIds.add(ele);
          }
          return this;
      }
docs: <p>
  A list of identifiers of the directories for which to obtain the information. If this member is null, all
  directories that belong to the current account are returned.
  </p>
  <p>
  An empty list results in an <code>InvalidParameterException</code> being thrown.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDirectoryIds(java.util.Collection)} or {@link #withDirectoryIds(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param directoryIds
  A list of identifiers of the directories for which to obtain the information. If this member is null, all
  directories that belong to the current account are returned.</p>
  <p>
  An empty list results in an <code>InvalidParameterException</code> being thrown.
  @return Returns a reference to this object so that method calls can be chained together.