public void setAliasAttributes(java.util.Collection<String> aliasAttributes) {
        if (aliasAttributes == null) {
            this.aliasAttributes = null;
            return;
        }

        this.aliasAttributes = new java.util.ArrayList<String>(aliasAttributes);
    }
<p>
Attributes supported as an alias for this user pool. Possible values: <b>phone_number</b>, <b>email</b>, or
<b>preferred_username</b>.
</p>

@param aliasAttributes
       Attributes supported as an alias for this user pool. Possible values: <b>phone_number</b>, <b>email</b>,
       or <b>preferred_username</b>.
@see AliasAttributeType
aws-java-sdk-cognitoidp/src/main/java/com/amazonaws/services/cognitoidp/model/CreateUserPoolRequest.java