public void setFilter(java.util.Collection<Filter> filter) {
        if (filter == null) {
            this.filter = null;
            return;
        }

        this.filter = new com.amazonaws.internal.SdkInternalList<Filter>(filter);
    }
<p>
The filters.
</p>
<ul>
<li>
<p>
<code>instance-family</code> - The instance family (for example, <code>m4</code>).
</p>
</li>
<li>
<p>
<code>payment-option</code> - The payment option (<code>NoUpfront</code> | <code>PartialUpfront</code> |
<code>AllUpfront</code>).
</p>
</li>
<li>
<p>
<code>state</code> - The state of the reservation (<code>payment-pending</code> | <code>payment-failed</code> |
<code>active</code> | <code>retired</code>).
</p>
</li>
<li>
<p>
<code>tag:&lt;key&gt;</code> - The key/value combination of a tag assigned to the resource. Use the tag key in
the filter name and the tag value as the filter value. For example, to find all resources that have a tag with
the key <code>Owner</code> and the value <code>TeamA</code>, specify <code>tag:Owner</code> for the filter name
and <code>TeamA</code> for the filter value.
</p>
</li>
<li>
<p>
<code>tag-key</code> - The key of a tag assigned to the resource. Use this filter to find all resources assigned
a tag with a specific key, regardless of the tag value.
</p>
</li>
</ul>

@param filter
       The filters.</p>
       <ul>
       <li>
       <p>
       <code>instance-family</code> - The instance family (for example, <code>m4</code>).
       </p>
       </li>
       <li>
       <p>
       <code>payment-option</code> - The payment option (<code>NoUpfront</code> | <code>PartialUpfront</code> |
       <code>AllUpfront</code>).
       </p>
       </li>
       <li>
       <p>
       <code>state</code> - The state of the reservation (<code>payment-pending</code> |
       <code>payment-failed</code> | <code>active</code> | <code>retired</code>).
       </p>
       </li>
       <li>
       <p>
       <code>tag:&lt;key&gt;</code> - The key/value combination of a tag assigned to the resource. Use the tag
       key in the filter name and the tag value as the filter value. For example, to find all resources that have
       a tag with the key <code>Owner</code> and the value <code>TeamA</code>, specify <code>tag:Owner</code> for
       the filter name and <code>TeamA</code> for the filter value.
       </p>
       </li>
       <li>
       <p>
       <code>tag-key</code> - The key of a tag assigned to the resource. Use this filter to find all resources
       assigned a tag with a specific key, regardless of the tag value.
       </p>
       </li>
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/DescribeHostReservationsRequest.java