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Small library for Excel generation based on XLS templates

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package org.jxls.functions;

public interface Summarizer {
    
    /**
     * Casts number to type T and adds value to sum if number not null.
     * @param number a number to add
     */
    void add(Object number);
    
    /**
     * @return sum of type T
     */
    T getSum();
}