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BookServiceServantData.javaAPI DocExample2715Fri Jan 31 22:16:40 GMT 2003ora.jwsnut.chapter2.ejbbookservice

BookServiceServantData

public class BookServiceServantData extends Object
A class that loads the data for the book service and provides access to it in the form of an array of BookInfo objects.

(Omit source code)

Fields Summary
private static ora.jwsnut.chapter2.bookservice.BookInfo[]
bookInfo
The loaded data, created when it is first requested
private static HashMap
bookMap
The data in the form of a HashMap, created when it is first requested.
Constructors Summary
Methods Summary
static ora.jwsnut.chapter2.bookservice.BookInfo[]getBookInfo()
Gets the book info, creating it if necessary.

return
an array of BookInfo objects with one entry for each book.

        if (bookInfo == null) {
            // First request - create the data
            ArrayList list = new ArrayList();
            try {
                InputStream is = 
                    BookServiceServantData.class.getResourceAsStream("booklist.txt");
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                String line;
                while ((line = reader.readLine()) != null) {
                    StringTokenizer st = new StringTokenizer(line, "!");
                    if (st.countTokens() == 4) {
                        list.add(new BookInfo(st.nextToken(), st.nextToken(),
                                st.nextToken(), Double.parseDouble(st.nextToken())));
                    }
                }
            } catch (Exception ex) {
                // Just return an empty or partial list                
                ex.printStackTrace();
            }
            
            // Convert the list to an array
            bookInfo = new BookInfo[list.size()];
            list.toArray(bookInfo);
        }
        return bookInfo;
static java.util.HashMapgetBookInfoHashMap()
Returns all of the books known to the book service in the form of a HashMap where the key to each entry is the book title in upper case and the value is a BookInfo object.

        if (bookMap == null) {
            BookInfo[] info = getBookInfo();
            bookMap = new HashMap();
            for (int i = 0; i < info.length; i++) {
                BookInfo book = info[i];
                bookMap.put(book.getTitle().toUpperCase(), book);
            }
        }
        return bookMap;