package com.onaro.util.jfc.grouping;

/**
 * A summarizer creates values for group columns (without summarizers, the rows
 * of a group will be empty).
 */
public interface Summarizer {

    /**
     * Update the summary of a node and all its descendants.
     * @param node the node to iupdate
     */
    public void updateSummary(Node node);
    
}