新增书籍表、列表/搜索、管理员/馆员维护入口
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Zzzz
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package com.mzh.library.service.impl;
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import com.mzh.library.dao.BookDao;
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import com.mzh.library.entity.AuthenticatedUser;
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import com.mzh.library.entity.Book;
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import com.mzh.library.entity.BookCategory;
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import com.mzh.library.entity.BookSearchCriteria;
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import com.mzh.library.entity.Permission;
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import com.mzh.library.exception.DaoException;
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import com.mzh.library.service.BookService;
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import com.mzh.library.service.PermissionPolicy;
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import com.mzh.library.service.ServiceResult;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Optional;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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public class BookServiceImpl implements BookService {
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private static final Logger LOGGER = Logger.getLogger(BookServiceImpl.class.getName());
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private static final String UNAVAILABLE_MESSAGE =
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"Book service is temporarily unavailable. Please try again later.";
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private static final String VALIDATION_MESSAGE = "Please correct the highlighted book fields.";
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private static final String DENIED_MESSAGE = "You do not have permission to manage books.";
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private final BookDao bookDao;
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private final PermissionPolicy permissionPolicy;
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public BookServiceImpl(BookDao bookDao) {
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this(bookDao, new PermissionPolicy());
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}
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public BookServiceImpl(BookDao bookDao, PermissionPolicy permissionPolicy) {
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this.bookDao = bookDao;
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this.permissionPolicy = permissionPolicy;
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}
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@Override
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public ServiceResult<List<BookCategory>> listCategories() {
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try {
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return ServiceResult.success(bookDao.findAllCategories());
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} catch (DaoException ex) {
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LOGGER.log(Level.SEVERE, "Unable to list book categories", ex);
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return ServiceResult.failure(UNAVAILABLE_MESSAGE);
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}
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}
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@Override
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public ServiceResult<List<Book>> searchBooks(BookSearchCriteria criteria) {
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BookSearchCriteria normalized = criteria == null ? new BookSearchCriteria() : criteria;
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if (normalized.getCategoryId() != null && normalized.getCategoryId() <= 0) {
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Map<String, String> errors = new LinkedHashMap<>();
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errors.put("categoryId", "Select a valid category.");
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return ServiceResult.validationFailure("Please correct the catalog search filters.", errors);
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}
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try {
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return ServiceResult.success(bookDao.search(normalized));
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} catch (DaoException ex) {
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LOGGER.log(Level.SEVERE, "Unable to search books", ex);
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return ServiceResult.failure(UNAVAILABLE_MESSAGE);
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}
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}
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@Override
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public ServiceResult<Optional<Book>> findBook(long id) {
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if (id <= 0) {
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return ServiceResult.failure("Select a valid book.");
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}
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try {
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return ServiceResult.success(bookDao.findById(id));
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} catch (DaoException ex) {
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LOGGER.log(Level.SEVERE, "Unable to load book id=" + id, ex);
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return ServiceResult.failure(UNAVAILABLE_MESSAGE);
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}
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}
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@Override
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public ServiceResult<Long> createBook(AuthenticatedUser actor, Book book) {
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if (!canManageBooks(actor)) {
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return ServiceResult.failure(DENIED_MESSAGE);
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}
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normalize(book);
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Map<String, String> errors = validate(book, false);
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if (!errors.isEmpty()) {
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return ServiceResult.validationFailure(VALIDATION_MESSAGE, errors);
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}
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try {
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if (bookDao.findByIdentifier(book.getIdentifier()).isPresent()) {
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errors.put("identifier", "Book identifier is already in use.");
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return ServiceResult.validationFailure(VALIDATION_MESSAGE, errors);
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}
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long id = bookDao.create(book);
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LOGGER.info("Created book id=" + id + " actorId=" + actor.getId());
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return ServiceResult.success(id, "Book created.");
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} catch (DaoException ex) {
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LOGGER.log(Level.SEVERE, "Unable to create book actorId=" + actor.getId(), ex);
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return ServiceResult.failure(UNAVAILABLE_MESSAGE);
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}
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}
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@Override
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public ServiceResult<Void> updateBook(AuthenticatedUser actor, Book book) {
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if (!canManageBooks(actor)) {
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return ServiceResult.failure(DENIED_MESSAGE);
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}
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normalize(book);
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Map<String, String> errors = validate(book, true);
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if (!errors.isEmpty()) {
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return ServiceResult.validationFailure(VALIDATION_MESSAGE, errors);
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}
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try {
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Optional<Book> existingWithIdentifier = bookDao.findByIdentifier(book.getIdentifier());
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if (existingWithIdentifier.isPresent() && existingWithIdentifier.get().getId() != book.getId()) {
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errors.put("identifier", "Book identifier is already in use.");
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return ServiceResult.validationFailure(VALIDATION_MESSAGE, errors);
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}
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if (!bookDao.update(book)) {
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return ServiceResult.failure("Book was not found.");
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}
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LOGGER.info("Updated book id=" + book.getId() + " actorId=" + actor.getId());
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return ServiceResult.success(null, "Book updated.");
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} catch (DaoException ex) {
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LOGGER.log(Level.SEVERE, "Unable to update book id=" + book.getId() + " actorId=" + actor.getId(), ex);
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return ServiceResult.failure(UNAVAILABLE_MESSAGE);
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}
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}
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@Override
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public ServiceResult<Void> deleteBook(AuthenticatedUser actor, long id) {
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if (!canManageBooks(actor)) {
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return ServiceResult.failure(DENIED_MESSAGE);
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}
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if (id <= 0) {
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return ServiceResult.failure("Select a valid book.");
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}
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try {
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if (!bookDao.delete(id)) {
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return ServiceResult.failure("Book was not found.");
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}
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LOGGER.info("Deleted book id=" + id + " actorId=" + actor.getId());
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return ServiceResult.success(null, "Book deleted.");
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} catch (DaoException ex) {
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LOGGER.log(Level.SEVERE, "Unable to delete book id=" + id + " actorId=" + actor.getId(), ex);
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return ServiceResult.failure(UNAVAILABLE_MESSAGE);
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}
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}
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private boolean canManageBooks(AuthenticatedUser actor) {
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return actor != null && permissionPolicy.allows(actor.getRole(), Permission.MANAGE_BOOKS);
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}
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private void normalize(Book book) {
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if (book == null) {
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return;
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}
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book.setIdentifier(trim(book.getIdentifier()));
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book.setTitle(trim(book.getTitle()));
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book.setAuthor(trim(book.getAuthor()));
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}
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private Map<String, String> validate(Book book, boolean requireId) {
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Map<String, String> errors = new LinkedHashMap<>();
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if (book == null) {
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errors.put("book", "Book details are required.");
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return errors;
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}
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if (requireId && book.getId() <= 0) {
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errors.put("id", "Select a valid book.");
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}
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requireLength(errors, "identifier", book.getIdentifier(), "Book identifier", 64);
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requireLength(errors, "title", book.getTitle(), "Title", 200);
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requireLength(errors, "author", book.getAuthor(), "Author", 120);
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if (book.getCategoryId() <= 0) {
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errors.put("categoryId", "Select a category.");
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}
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if (book.getTotalCopies() < 0) {
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errors.put("totalCopies", "Total copies cannot be negative.");
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}
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if (book.getAvailableCopies() < 0) {
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errors.put("availableCopies", "Available copies cannot be negative.");
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}
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if (book.getAvailableCopies() > book.getTotalCopies()) {
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errors.put("availableCopies", "Available copies cannot exceed total copies.");
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}
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if (book.getStatus() == null) {
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errors.put("status", "Select a status.");
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}
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return errors;
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}
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private void requireLength(Map<String, String> errors, String field, String value, String label, int maxLength) {
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if (value == null || value.isEmpty()) {
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errors.put(field, label + " is required.");
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return;
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}
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if (value.length() > maxLength) {
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errors.put(field, label + " must be " + maxLength + " characters or fewer.");
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}
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}
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private String trim(String value) {
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return value == null ? "" : value.trim();
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}
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}
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