public void setExpression(java.util.Collection<LFTag> expression) {
        if (expression == null) {
            this.expression = null;
            return;
        }

        this.expression = new java.util.ArrayList<LFTag>(expression);
    }
<p>
A list of LF-tag conditions that apply to database resources.
</p>

@param expression
       A list of LF-tag conditions that apply to database resources.
aws-java-sdk-dataexchange/src/main/java/com/amazonaws/services/dataexchange/model/DatabaseLFTagPolicy.java