package developerworks.ajax.store;import java.util.*;import java.util.regex.*;/** * Data access class for product catalogue. * In this implementation, backing store is a simple static map */public class CatalogueDAO {  // Static datastore in lieu of a live database  private static Map<String,Item> allItems = new HashMap<String,Item>();  /**   * Returns the Item corresponding to a given Item ID Code   * @param id The ID code of the item   * @return the matching Item   */  public Item getItem(String id) {    return allItems.get(id);  }  /**   * Returns all Items in the catalogue   * @return all items in the catalogue   */  public Collection<Item> getAllItems() {    return allItems.values();  }  /**   * Returns a list of items in the catalogue that have names or   * descriptions matching the search expression   * @param expression Text to search item names and descriptions for   * @return list of all matching items   */  public List<Item> findItems(String expression) {    List<Item> foundItems = new ArrayList<Item>();    String needles[] = expression.trim().toLowerCase().split("\\s+");    for (Iterator<Item> I = allItems.values().iterator() ; I.hasNext() ; ) {      Item item = I.next();      // Fake a case-insensitive boolean AND search over the item's text fields      String haystack = (item.getName()+" "+item.getDescription()).toLowerCase();      boolean isMatch = true;      // Need to find all the needles in the haystack for the item to be a match      for (int needleIdx = 0 ; (needleIdx < needles.length) && isMatch ; needleIdx++) {        if (!haystack.matches(".*\\b"+needles[needleIdx]+"\\b.*")) {          isMatch = false;        }       } // needles      if (isMatch) {        foundItems.add(item);      }    } // items    return foundItems;  }  // Statically populate the datastore  static {    allItems.put("i-20897", new Item("i-20897","Bel-link USB Bluetooth dongle","Supplied with drivers for Windows and Macintosh",1999));    allItems.put("i-55766", new Item("i-55766","Oolong 128MB CF Card","128 Megabyte Type 1 CompactFlash card. Manufactured by Oolong Industries",1999));    allItems.put("i-55767", new Item("i-55767","Oolong 256MB CF Card","256 Megabyte Type 1 CompactFlash card. Manufactured by Oolong Industries",3499));    allItems.put("i-55768", new Item("i-55768","Oolong 512MB CF Card","512 Megabyte Type 1 CompactFlash card. Manufactured by Oolong Industries",4999));    allItems.put("i-55769", new Item("i-55769","Oolong 1GB CF Card","1 Gigabyte Type 1 CompactFlash card. Manufactured by Oolong Industries",8999));    allItems.put("i-74488", new Item("i-74488","Fujak Superpix130 Camera","3.0 Megapixel digital camera featuring six shooting modes and 2x optical zoom. Silver.",14999));    allItems.put("i-74489", new Item("i-74489","Fujak Superpix145 Camera","4.5 Megapixel digital camera featuring six shooting modes and 2x optical zoom. Silver.",19999));    allItems.put("i-74490", new Item("i-74490","Fujak Superpix158 Camera","5.8 Megapixel digital camera featuring six shooting modes and 2.5x optical zoom. Silver.",24999));    allItems.put("i-74491", new Item("i-74491","Fujak Superpix172 Camera","7.2 Megapixel digital camera featuring six shooting modes and 3x optical zoom. Silver.",29999));    allItems.put("i-87871", new Item("i-87871","Maxigate HD400L","40GB Serial ATA Disk Drive, 7200rpm, 8MB cache",4499));    allItems.put("i-87872", new Item("i-87872","Maxigate HD800L","80GB Serial ATA Disk Drive, 7200rpm, 8MB cache",5999));    allItems.put("i-87873", new Item("i-87873","Maxigate HD1200L","120GB Serial ATA Disk Drive, 7200rpm, 8MB cache",7999));    allItems.put("i-87874", new Item("i-87874","Maxigate HD1600L","160GB Serial ATA Disk Drive, 7200rpm, 8MB cache",9999));    allItems.put("i-87875", new Item("i-87875","Maxigate HD2000L","200GB Serial ATA Disk Drive, 7200rpm, 8MB cache",11999));  }}