public com.google.api.ads.adwords.axis.v201809.cm.Criterion getCriterion() {
        return criterion;
    }
public com . google . api . ads . adwords . axis . v201809 . cm . Criterion getCriterion ( ) { return criterion ; }
Gets the criterion value for this AdGroupBidModifier.

@return criterion   * The criterion whose bid value is being overridden.

<p>Currently, bid modifier overrides are supported
only for platform criterion
(ID=30000, 30001, 30002) and preferred content criterion
(ID = 400).
The {@linkplain AdGroupBidModifierService#get} method
returns all platform and
preferred content criteria.
<span class="constraint Required">This field is required
and should not be {@code null}.</span>