public void setFilter(Expression filter) {
        this.filter = filter;
    }
<p>
Filters utilization data by dimensions. You can filter by the following dimensions:
</p>
<ul>
<li>
<p>
AZ
</p>
</li>
<li>
<p>
CACHE_ENGINE
</p>
</li>
<li>
<p>
DEPLOYMENT_OPTION
</p>
</li>
<li>
<p>
INSTANCE_TYPE
</p>
</li>
<li>
<p>
LINKED_ACCOUNT
</p>
</li>
<li>
<p>
OPERATING_SYSTEM
</p>
</li>
<li>
<p>
PLATFORM
</p>
</li>
<li>
<p>
REGION
</p>
</li>
<li>
<p>
SERVICE
</p>
</li>
<li>
<p>
SCOPE
</p>
</li>
<li>
<p>
TENANCY
</p>
</li>
</ul>
<p>
<code>GetReservationUtilization</code> uses the same <a
href="https://docs.aws.amazon.com/aws-cost-management/latest/APIReference/API_Expression.html">Expression</a>
object as the other operations, but only <code>AND</code> is supported among each dimension, and nesting is
supported up to only one level deep. If there are multiple values for a dimension, they are OR'd together.
</p>

@param filter
       Filters utilization data by dimensions. You can filter by the following dimensions:</p>
       <ul>
       <li>
       <p>
       AZ
       </p>
       </li>
       <li>
       <p>
       CACHE_ENGINE
       </p>
       </li>
       <li>
       <p>
       DEPLOYMENT_OPTION
       </p>
       </li>
       <li>
       <p>
       INSTANCE_TYPE
       </p>
       </li>
       <li>
       <p>
       LINKED_ACCOUNT
       </p>
       </li>
       <li>
       <p>
       OPERATING_SYSTEM
       </p>
       </li>
       <li>
       <p>
       PLATFORM
       </p>
       </li>
       <li>
       <p>
       REGION
       </p>
       </li>
       <li>
       <p>
       SERVICE
       </p>
       </li>
       <li>
       <p>
       SCOPE
       </p>
       </li>
       <li>
       <p>
       TENANCY
       </p>
       </li>
       </ul>
       <p>
       <code>GetReservationUtilization</code> uses the same <a
       href="https://docs.aws.amazon.com/aws-cost-management/latest/APIReference/API_Expression.html"
       >Expression</a> object as the other operations, but only <code>AND</code> is supported among each
       dimension, and nesting is supported up to only one level deep. If there are multiple values for a
       dimension, they are OR'd together.
aws-java-sdk-costexplorer/src/main/java/com/amazonaws/services/costexplorer/model/GetReservationUtilizationRequest.java