public BookCatalogImpl() {
try {
final String filePath = path + "catalog.json";
// read the json file
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream inputStream = classLoader.getResourceAsStream(filePath);
BufferedReader streamReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
bookStrBuilder = new StringBuilder();
String inputStr;
while ((inputStr = streamReader.readLine()) != null) bookStrBuilder.append(inputStr);
final ObjectMapper mapper = new ObjectMapper();
catalog = mapper.readValue(bookStrBuilder.toString(), new TypeReference<List<Book>>() {});
hBookDetails = new Hashtable();
for (Book book : catalog) {
hBookDetails.put(book.getId(), book);
}
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} catch (NullPointerException ex) {
ex.printStackTrace();
}
}
public String getBookDetailsAsString(String id) {
Book book = hBookDetails.get(id);
String json = "";
ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
JSONObject ret = new JSONObject();
ret.put("id", book.getId());
ret.put("author", book.getAuthor());
ret.put("name", book.getName());
ret.put("description", book.getDescription());
ret.put("category", book.getCategory());
ret.put("price", book.getPrice());
ret.put("isNew", book.getIsNew());
try {
json = ow.writeValueAsString(book.getComments());
ret.put("comments", new JSONArray(json));
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return ret.toString();
}