/*
 * Created on Apr 24, 2005
 */
package stockportfolio;

import java.util.Date;

/** Information about a single block of stock.  A "block" is defined by
 * a number of shares of the same stock, purchased at the same time
 * at the same price.
 * 
 * You shouldn't need change this class, if you even use it.
 */
public abstract class AbsStockBlock implements IStockBlock { 
    
    private final String stock;
    private final Date date;
    private double amount;
    private final double pricePerShare;
    
    /** Create a new block of stock.
     * 
     * @param stock a non-null string, which should be normalized and
     * used as the stock name.
     * @param date a non-null date, when the stock was purchased.
     * @param amount the number of shares purchased (must be > 0).
     * @param pricePerShare the price per shape (must be > 0).
     */
    public AbsStockBlock(String stock,
            Date date, 
            double amount,
            double pricePerShare) {
        this.stock = stock; //????
        if (stock == null) {
            throw new IllegalArgumentException("stock must not be null");
        } else
        //this.stock = stock;
        if (date == null) { 
            throw new IllegalArgumentException("date must not be null");
        }
        this.date = date;
        if (amount <= 0) {
            throw new IllegalArgumentException("amount must be positive");
        }
        this.amount = amount;
        if (pricePerShare <= 0) {
            throw new IllegalArgumentException("price per share must not be negative");
        }
        this.pricePerShare = pricePerShare;
    }
    
    /* 
     * @see stockportfolioSolution.IStockBlock.getStock()
     */
    public String getStock() {
        return this.stock; 
    }
    
    /* 
     * @see stockportfolioSolution.IStockBlock.getTransactionDate()
     */
    public Date getTransactionDate() {
        return this.date;
    }
    
    /* 
     * @see stockportfolioSolution.IStockBlock.getShares()
     */
    public double getShares() {
        return this.amount;
    }
    
    /* 
     * @see stocksstarter.IStockTransaction#getPricePerShare()
     */
    public double getPricePerShare() {
        return this.pricePerShare;
    }

    
    /** Give out a one-line summary of the block information. */
    public String toString() {
        return this.getStock() + " [" + this.getTransactionDate() + "]" +
        	" " + this.getShares() + " shares @ " + this.getPricePerShare();
    }
    
}