code: public ValidDBInstanceModificationsMessage withValidProcessorFeatures(AvailableProcessorFeature... validProcessorFeatures) {
          if (this.validProcessorFeatures == null) {
              setValidProcessorFeatures(new com.amazonaws.internal.SdkInternalList<AvailableProcessorFeature>(validProcessorFeatures.length));
          }
          for (AvailableProcessorFeature ele : validProcessorFeatures) {
              this.validProcessorFeatures.add(ele);
          }
          return this;
      }
docs: <p>
  Valid processor features for your DB instance.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setValidProcessorFeatures(java.util.Collection)} or
  {@link #withValidProcessorFeatures(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param validProcessorFeatures
  Valid processor features for your DB instance.
  @return Returns a reference to this object so that method calls can be chained together.