package com.onaro.sanscreen.client.view.tabular.value;

import com.onaro.sanscreen.client.view.tabular.NumberColumn;

/**
 * Sum the number values in a {@link NumberColumn} for the rows in a group. Multiple values that
 * are equal in terms of {@link NumberValue#equals(Object)} and {@link NumberValue#hashCode()}
 * are summed only once.
 * <p>If all children of a group are equal (not in value, but when testing the equals and hashcode methods),
 * then one of the values becomes the summary.
 * <p>If any of the children isn't a {@link NumberValue}, the summary will be empty.
 * <p>Usage example: Summing the capacity of volumes in a group where the capacicty value is
 * identified by the volume name.
 */
public class SumUniqueNumberColumnSummarizer extends ConditionalSumUniqueNumberColumnSummarizer {

    /**
     * Initialize a summarizer for the given column.
     * @param column the column to put the sum in
     */
    public SumUniqueNumberColumnSummarizer(int column) {
        this(column, "default"); //$NON-NLS-1$
    }

    /**
     * Initialize a summarizer for the given column.
     * @param column the column to put the sum in
     */
    public SumUniqueNumberColumnSummarizer(int column, String format) {
    	super(null, column, format);
    }
}