StockDaoImpl.java

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 *
 * Copyright (c) void.fm
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 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
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package etm.tutorial.fiveminute.store.dao;

import etm.tutorial.fiveminute.store.UnknownArticleException;
import etm.tutorial.fiveminute.store.model.Item;
import etm.tutorial.fiveminute.store.model.StockItem;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Default demo DAO implementation.
 *
 * @author void.fm
 * @version $Revision$
 */
public class StockDaoImpl implements StockDao {

  private Map catalog = new HashMap();
  private Map stock = new HashMap();


  public StockDaoImpl() {
    loadInitialStock();
  }


  public boolean addOrder(Item item, int quantity) throws UnknownArticleException {
    StockItem stockItem = (StockItem) stock.get(new Integer(item.getId()));
    if (stockItem != null) {
      if (stockItem.getQuantity() >= quantity) {
        stockItem.decreaseQuantity(quantity);
        if (stockItem.getQuantity() == 0) {
          stock.remove(new Integer(stockItem.getItem().getId()));
        }
        return true;
      } else {
        return false;
      }
    } else {
      throw new UnknownArticleException();
    }
  }


  public List getCurrentStock() {
    return new ArrayList(stock.values());
  }

  public Item getItem(int aItemId) {
    return (Item) catalog.get(new Integer(aItemId));
  }


  private void loadInitialStock() {
    catalog.put(new Integer(1), new Item(1, "apples", BigDecimal.valueOf(2.99)));
    catalog.put(new Integer(2), new Item(2, "oranges", BigDecimal.valueOf(1.49)));
    catalog.put(new Integer(3), new Item(3, "bananas", BigDecimal.valueOf(1.99)));
    catalog.put(new Integer(4), new Item(4, "grapes", BigDecimal.valueOf(2.49)));

    stock.put(new Integer(1), new StockItem((Item) catalog.get(Integer.valueOf(1)), 15));
    stock.put(new Integer(2), new StockItem((Item) catalog.get(Integer.valueOf(2)), 5));
    stock.put(new Integer(3), new StockItem((Item) catalog.get(Integer.valueOf(3)), 20));
    stock.put(new Integer(4), new StockItem((Item) catalog.get(Integer.valueOf(4)), 11));
  }


}