code: public ListIdentitiesResult withIdentities(IdentityDescription... identities) {
          if (this.identities == null) {
              setIdentities(new java.util.ArrayList<IdentityDescription>(identities.length));
          }
          for (IdentityDescription ele : identities) {
              this.identities.add(ele);
          }
          return this;
      }
docs: <p>
  An object containing a set of identities and associated mappings.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setIdentities(java.util.Collection)} or {@link #withIdentities(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param identities
  An object containing a set of identities and associated mappings.
  @return Returns a reference to this object so that method calls can be chained together.