equals

    @Override
    public boolean equals(Object another)
    {
        if (this == another)
        {
            return true;
        }
        if (another instanceof QueryPerfEntry)
        {
            QueryPerfEntry anotherEntry = (QueryPerfEntry) another;
            boolean tempResult = 
                    tid == anotherEntry.tid
                    && tag.equals(anotherEntry.tag)
                    && group.equals(anotherEntry.group)
                    && exkey == anotherEntry.exkey;
            
            return tempResult;
        }
        return false;
    }