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BoxBean.java
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BoxBean.java
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package kp.j_p_a.controller;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.Resource;
import jakarta.ejb.EJBContext;
import jakarta.ejb.Stateless;
import jakarta.inject.Inject;
import jakarta.inject.Named;
import jakarta.persistence.EntityManager;
import jakarta.persistence.Query;
import jakarta.persistence.TypedQuery;
import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Order;
import jakarta.persistence.criteria.Predicate;
import jakarta.persistence.criteria.Root;
import jakarta.persistence.criteria.Subquery;
import kp.Constants;
import kp.j_p_a.domain.boxes.CentralBox;
import kp.j_p_a.domain.boxes.LowerBox;
import kp.j_p_a.domain.boxes.MultiBox;
import kp.j_p_a.domain.boxes.SingleBox;
import kp.j_p_a.domain.boxes.UpperBox;
import kp.j_p_a.domain.components.TermDates;
import kp.util.Tools;
/**
* The stateless session bean for <B>box</B>.<BR>
* Uses container-managed transactions.
*
*/
@Named
@Stateless
public class BoxBean {
private static final boolean USE_NATIVE_QUERY = true;
private static final boolean USE_CRITERIA = true;
@SuppressWarnings("java:S6813") // switch off Sonarqube rule 'Avoid field dependency injection'
@Inject
private Logger logger;
@SuppressWarnings("java:S6813") // switch off Sonarqube rule 'Avoid field dependency injection'
@Inject
private List<String> report;
@Resource
private EJBContext ejbContext;
@SuppressWarnings("java:S6813") // switch off Sonarqube rule 'Avoid field dependency injection'
@Inject
private EntityManager entityManager;
private CriteriaBuilder criteriaBuilder;
private static final Class<?>[] BOX_CLASSES_ARR = { CentralBox.class, UpperBox.class, SingleBox.class,
MultiBox.class, LowerBox.class };
private static final List<String> MUTABLE_TEXT_LIST = new ArrayList<>(Tools.getTextList());
private static final String IDENTIFIER = "identifier";
/**
* The constructor.
*/
public BoxBean() {
super();
}
/**
* Initializes bean.
*
*/
@PostConstruct
private void init() {
criteriaBuilder = entityManager.getCriteriaBuilder();
}
/**
* Creates the {@link CentralBox}.
*
* @return the result
*/
public String createCentralBox() {
/*
* Method uses bean-managed transaction.
*/
report.clear();
try {
final CentralBox centralBox = createAndFillCentralBox();
if (getNumberOfCentralBoxes() > 3) {
// simulate validation error
ejbContext.setRollbackOnly();
final String msg = "The maximum number of boxes is 3. The creating was aborted and the transaction was marked for rollback.";
report.add(msg);
if (logger.isLoggable(Level.WARNING)) {
logger.warning(String.format("createCentralBox(): %s", msg));
}
return "";
}
loadLinesFromBox(centralBox);
} catch (Exception e) {
logger.severe(String.format("createCentralBox(): exception[%s]", e.getMessage()));
return "";
}
if (logger.isLoggable(Level.INFO)) {
logger.info("createCentralBox():");
}
return "";
}
/**
* Reads the {@link CentralBox} list.
*
* @return the result
*/
public String readCentralBoxes() {
report.clear();
showBoxesCount();
final List<CentralBox> centralBoxList = findCentralBoxes();
if (centralBoxList.isEmpty()) {
report.add(Constants.EMPTY);
if (logger.isLoggable(Level.INFO)) {
logger.info("readCentralBoxes(): empty");
}
return "";
}
for (CentralBox centralBox : centralBoxList) {
report.add(Constants.LINE);
loadLinesFromBox(centralBox);
}
if (logger.isLoggable(Level.INFO)) {
logger.info(String.format("readCentralBoxes(): centralBoxList size[%d]", centralBoxList.size()));
}
return "";
}
/**
* Updates the {@link CentralBox} list.
*
* @return the result
*/
public String updateCentralBoxes() {
/*
* Method uses bean-managed transaction.
*/
report.clear();
showBoxesCount();
if (getNumberOfCentralBoxes() < 1) {
report.add(Constants.EMPTY);
if (logger.isLoggable(Level.INFO)) {
logger.info("updateCentralBoxes(): nothing to update");
}
return "";
}
List<CentralBox> centralBoxList;
try {
centralBoxList = findCentralBoxes();
for (CentralBox centralBox : centralBoxList) {
centralBox.setCardinalDirection(centralBox.getCardinalDirection().getNext());
entityManager.merge(centralBox);
}
} catch (Exception e) {
logger.severe(String.format("updateCentralBoxes(): exception[%s]", e.getMessage()));
return "";
}
for (CentralBox centralBox : centralBoxList) {
report.add(Constants.LINE);
loadLinesFromBox(centralBox);
}
if (logger.isLoggable(Level.INFO)) {
logger.info("updateCentralBoxes():");
}
return "";
}
/**
* Deletes the {@link CentralBox}.
*
* @return the result
*/
public String deleteCentralBox() {
report.clear();
if (getNumberOfCentralBoxes() < 1) {
showBoxesCount();
report.add(Constants.EMPTY);
if (logger.isLoggable(Level.INFO)) {
logger.info("deleteCentralBox(): nothing to delete");
}
return "";
}
try {
final CentralBox centralBox = findCentralBoxForRemove();
entityManager.remove(centralBox);
} catch (Exception e) {
logger.severe(String.format("deleteCentralBox(): exception[%s]", e.getMessage()));
return "";
}
showBoxesCount();
if (logger.isLoggable(Level.INFO)) {
logger.info("deleteCentralBox():");
}
return "";
}
/**
* Creates and fills the {@link CentralBox}.
*
* @return the {@link CentralBox}.
*/
private CentralBox createAndFillCentralBox() {
final CentralBox centralBox = new CentralBox();
entityManager.persist(centralBox);
centralBox.setText(MUTABLE_TEXT_LIST.getFirst());
centralBox.setTermDates(new TermDates());
addUpperBox(centralBox);
final String label = String.format("created by %s", MUTABLE_TEXT_LIST.getFirst());
final SingleBox singleBox = new SingleBox();
singleBox.setText(label);
singleBox.setCentralBox(centralBox);
centralBox.setSingleBox(singleBox);
createMultiplicity(centralBox, label);
for (int i = 1; i <= 2; i++) {
final LowerBox lowerBox = new LowerBox();
lowerBox.setText(String.format("%s - item %d", label, i));
centralBox.addLowerBox(lowerBox);
}
entityManager.merge(centralBox);
Collections.rotate(MUTABLE_TEXT_LIST, -1);
return centralBox;
}
/**
* Adds the {@link UpperBox}.
*
* @param centralBox the {@link CentralBox}.
*/
private void addUpperBox(CentralBox centralBox) {
final CriteriaQuery<UpperBox> upperBoxCriteria = criteriaBuilder.createQuery(UpperBox.class);
upperBoxCriteria.select(upperBoxCriteria.from(UpperBox.class));
final TypedQuery<UpperBox> upperBoxQuery = entityManager.createQuery(upperBoxCriteria);
final List<UpperBox> upperBoxList = upperBoxQuery.getResultList();
final UpperBox upperBox;
if (upperBoxList.isEmpty()) {
upperBox = new UpperBox();
upperBox.setText("root");
} else {
upperBox = upperBoxList.getFirst();
}
upperBox.addCentralBox(centralBox);
}
/**
* Creates the multiplicity.
*
* @param centralBox the {@link CentralBox}
* @param label the label
*/
private void createMultiplicity(CentralBox centralBox, String label) {
final MultiBox multiBox = new MultiBox();
multiBox.setText(label);
final CriteriaQuery<CentralBox> centralBoxCriteria = criteriaBuilder.createQuery(CentralBox.class);
centralBoxCriteria.select(centralBoxCriteria.from(CentralBox.class));
final TypedQuery<CentralBox> centralBoxQuery = entityManager.createQuery(centralBoxCriteria);
final List<CentralBox> centralBoxList = centralBoxQuery.getResultList();
centralBoxList.forEach(cb -> cb.addMultiBox(multiBox));
final CriteriaQuery<MultiBox> multiBoxCriteria = criteriaBuilder.createQuery(MultiBox.class);
multiBoxCriteria.select(multiBoxCriteria.from(MultiBox.class));
final TypedQuery<MultiBox> multiBoxQuery = entityManager.createQuery(multiBoxCriteria);
final List<MultiBox> multiBoxList = multiBoxQuery.getResultList();
multiBoxList.forEach(centralBox::addMultiBox);
}
/**
* Finds the {@link CentralBox} list.
*
* @return the centralBoxList
*/
private List<CentralBox> findCentralBoxes() {
if (USE_NATIVE_QUERY) {
return prepareAndExecuteNativeQuery();
}
TypedQuery<CentralBox> query;
if (USE_CRITERIA) {
final CriteriaQuery<CentralBox> centralBoxCriteria = criteriaBuilder.createQuery(CentralBox.class);
final Root<CentralBox> centralBoxRoot = centralBoxCriteria.from(CentralBox.class);
centralBoxRoot.fetch("multiBoxes");
centralBoxRoot.fetch("lowerBoxes");
final Order order = criteriaBuilder.asc(centralBoxRoot.get(IDENTIFIER));
centralBoxCriteria.select(centralBoxRoot).distinct(true).orderBy(order);
query = entityManager.createQuery(centralBoxCriteria);
} else {
query = entityManager.createNamedQuery("CentralBox.findAll", CentralBox.class);
}
return query.getResultList();
}
/**
* Finds the {@link CentralBox} list using native query.<br>
* It is the temporary fix, because 'CriteriaQuery' and 'NamedQuery' both fail
* on current server 'Wildfly-27.0.0.Beta1'.
*
* @return the centralBoxList
*/
@SuppressWarnings("unchecked")
private List<CentralBox> prepareAndExecuteNativeQuery() {
Query query = entityManager.createNativeQuery("""
SELECT DISTINCT CB.* FROM CENTRALBOX CB ORDER BY CB.IDENTIFIER ASC
""", CentralBox.class);
return query.getResultList();
}
/**
* Finds the {@link CentralBox} for remove.
*
* @return the {@link CentralBox}
*/
private CentralBox findCentralBoxForRemove() {
final TypedQuery<CentralBox> centralBoxQuery;
if (USE_CRITERIA) {
final CriteriaQuery<CentralBox> criteriaQuery = criteriaBuilder.createQuery(CentralBox.class);
final Root<CentralBox> centralBoxRoot = criteriaQuery.from(CentralBox.class);
final Subquery<CentralBox> subQuery = criteriaQuery.subquery(CentralBox.class);
final Root<CentralBox> centralBoxSubRoot = subQuery.from(CentralBox.class);
subQuery.select(centralBoxSubRoot.get(IDENTIFIER)).distinct(true);
final Predicate predicate = criteriaBuilder.lessThanOrEqualTo(centralBoxRoot.get(IDENTIFIER),
criteriaBuilder.all(subQuery));
criteriaQuery.where(predicate);
centralBoxQuery = entityManager.createQuery(criteriaQuery);
} else {
centralBoxQuery = entityManager.createNamedQuery("CentralBox.findFirst", CentralBox.class);
}
final CentralBox centralBox = centralBoxQuery.getSingleResult();
clearMultiplicityBeforeRemove(centralBox);
return centralBox;
}
/**
* Clears the multiplicity before remove.
*
* @param centralBox the {@link CentralBox}
*/
private void clearMultiplicityBeforeRemove(CentralBox centralBox) {
new ArrayList<>(centralBox.getMultiBoxes()).forEach(centralBox::removeMultiBox);
final CriteriaQuery<MultiBox> multiBoxCriteria = criteriaBuilder.createQuery(MultiBox.class);
multiBoxCriteria.select(multiBoxCriteria.from(MultiBox.class));
final TypedQuery<MultiBox> multiBoxQuery = entityManager.createQuery(multiBoxCriteria);
final List<MultiBox> multiBoxList = multiBoxQuery.getResultList();
final CriteriaQuery<CentralBox> centralBoxCriteria = criteriaBuilder.createQuery(CentralBox.class);
centralBoxCriteria.select(centralBoxCriteria.from(CentralBox.class));
final TypedQuery<CentralBox> centralBoxQuery = entityManager.createQuery(centralBoxCriteria);
final List<CentralBox> centralBoxList = centralBoxQuery.getResultList();
for (MultiBox multiBox : multiBoxList) {
if (!multiBox.getCentralBoxes().isEmpty()) {
continue;
}
// remove empty multi box
centralBoxList.forEach(cb -> cb.removeMultiBox(multiBox));
entityManager.remove(multiBox);
}
}
/**
* Gets the {@link CentralBox} number.
*
* @return the number
*/
private long getNumberOfCentralBoxes() {
final CriteriaQuery<Long> countCriteria = criteriaBuilder.createQuery(Long.class);
countCriteria.select(criteriaBuilder.countDistinct(countCriteria.from(CentralBox.class)));
final TypedQuery<Long> countQuery = entityManager.createQuery(countCriteria);
return countQuery.getSingleResult();
}
/**
* Loads lines from the box.
*
* @param centralBox the {@link CentralBox}
*/
private void loadLinesFromBox(CentralBox centralBox) {
report.add(String.format("centralBox: identifier[%d], text[%s], cardinalDirection[%s]",
centralBox.getIdentifier(), centralBox.getText(), centralBox.getCardinalDirection()));
final TermDates termDates = centralBox.getTermDates();
report.add(String.format("localDate[%s], localDateTime[%s]",
termDates.getLocalDate().format(DateTimeFormatter.ISO_LOCAL_DATE),
termDates.getLocalDateTime().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)));
/*
* Many-To-One
*/
final UpperBox upperBox = centralBox.getUpperBox();
if (Objects.nonNull(upperBox)) {
report.add(String.format("'Many-To-One' upperBox: identifier[%d], text[%s]", upperBox.getIdentifier(),
upperBox.getText()));
} else {
report.add("'Many-To-One' NULL upperBox");
}
/*
* One-To-One
*/
final SingleBox singleBox = centralBox.getSingleBox();
if (Objects.nonNull(singleBox)) {
report.add(String.format("'One-To-One' singleBox: identifier[%d], text[%s]", singleBox.getIdentifier(),
singleBox.getText()));
} else {
report.add("'One-To-One' NULL singleBox");
}
/*
* Many-To-Many
*/
final Set<MultiBox> multiBoxes = centralBox.getMultiBoxes();
if (!multiBoxes.isEmpty()) {
for (MultiBox multiBox : multiBoxes) {
report.add(String.format("'Many-To-Many' multiBox: identifier[%d], text[%s]", multiBox.getIdentifier(),
multiBox.getText()));
}
} else {
report.add("'Many-To-Many' EMPTY multiBoxes");
}
/*
* One-To-Many
*/
final Set<LowerBox> lowerBoxes = centralBox.getLowerBoxes();
if (!lowerBoxes.isEmpty()) {
for (LowerBox lowerBox : lowerBoxes) {
report.add(String.format("'One-To-Many' lowerBox: identifier[%d], text[%s]", lowerBox.getIdentifier(),
lowerBox.getText()));
}
} else {
report.add("'One-To-Many' EMPTY lowerBoxes");
}
}
/**
* Shows the boxes count.
*
*/
private void showBoxesCount() {
final Long[] countArr = new Long[BOX_CLASSES_ARR.length];
for (int i = 0; i < BOX_CLASSES_ARR.length; i++) {
final CriteriaQuery<Long> countCriteria = criteriaBuilder.createQuery(Long.class);
countCriteria.select(criteriaBuilder.countDistinct(countCriteria.from(BOX_CLASSES_ARR[i])));
final TypedQuery<Long> countQuery = entityManager.createQuery(countCriteria);
countArr[i] = countQuery.getSingleResult();
}
report.add(String.format(
"Total count: CentralBoxes[%d], UpperBoxes[%d], SingleBoxes[%d], MultiBoxes[%d], LowerBoxes[%d]",
countArr[0], countArr[1], countArr[2], countArr[3], countArr[4]));
}
}