Business object classes.

Java Means Business
Business-oriented models for complex Swing apps
Lowell Kaplan
Listing 1. Business object classes.


public class StockQuote
{
        private Stock stock;
        private double lastPrice;
        private double netChange;
        private long volume;

        public StockQuote(Stock stock, double lastPrice, double
                                            netChange, long volume)
        {
            this.stock = stock;
            this.lastPrice = lastPrice;
            this.netChange = netChange;
            this.volume = volume;
        }

        public Stock getStock()
        {
            return stock;
        }

        public double getLastPrice()
        {
            return lastPrice;
        }

        public double getNetChange()
        {
            return netChange;
        }

        public long getVolume()
        {
            return volume;
        }

        public void updateData(StockQuote newQuote)
        {
            lastPrice = newQuote.getLastPrice();
            netChange = newQuote.getNetChange();
            volume = newQuote.getVolume();
        }

        public boolean equals(Object o)
        {
            if (o instanceof StockQuote)
            {
                StockQuote q = (StockQuote)o;
                if (this.getStock() != null)
                    return this.getStock().equals(q.getStock());
            }
            return false;
        }
}

public class Stock
{
        private String symbol;
        private Sector sector;

        public Stock(String symbol, Sector sector)
        {
            this.symbol = symbol;
            this.sector = sector;
        }

        public String getSymbol()
        {
            return symbol;
        }

        public Sector getSector()
        {
            return sector;
        }

        public boolean equals(Object o)
        {
            if (o instanceof Stock)
            {
                Stock s = (Stock)o;
                if (this.getSymbol() != null)
                    return this.getSymbol().equals(s.getSymbol());
            }
            return false;
        }
}

public class Sector
{
        private String sectorName;
        private Sector parentSector;

        public Sector(String sectorName, Sector parentSector)
        {
            this.sectorName = sectorName;
            this.parentSector = parentSector;
        }

        public String getSectorName()
        {
            return sectorName;
        }

        public Sector getParentSector()
        {
            return parentSector;
        }

        public boolean isAChildSectorOf(Sector s)
        {
            Sector currentSector = this;
            while (currentSector.getParentSector() != null)
            {
                Sector parent = currentSector.getParentSector();
                if (parent.equals(s))
                    return true;
                currentSector = parent;
            }
            return false;
        }

        public boolean equals(Object o)
        {
            if (o instanceof Sector)
            {
                Sector s = (Sector)o;
                if (this.getSectorName() != null)
                    return this.getSectorName().
                                equals(s.getSectorName());
            }
            return false;
        }

        public String toString()
        {
            return getSectorName();
        }
}

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