Java tutorial
/* * Copyright 2005-2013 shopxx.net. All rights reserved. * Support: http://www.shopxx.net * License: http://www.shopxx.net/license */ package net.groupbuy.dao.impl; import java.io.Serializable; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import javax.persistence.EntityManager; import javax.persistence.FlushModeType; import javax.persistence.LockModeType; import javax.persistence.PersistenceContext; import javax.persistence.TypedQuery; import javax.persistence.criteria.CriteriaBuilder; import javax.persistence.criteria.CriteriaQuery; import javax.persistence.criteria.Fetch; import javax.persistence.criteria.From; import javax.persistence.criteria.Join; import javax.persistence.criteria.Predicate; import javax.persistence.criteria.Root; import javax.persistence.criteria.Selection; import net.groupbuy.Filter; import net.groupbuy.Order; import net.groupbuy.Page; import net.groupbuy.Pageable; import net.groupbuy.Filter.Operator; import net.groupbuy.Order.Direction; import net.groupbuy.dao.BaseDao; import net.groupbuy.entity.OrderEntity; import org.apache.commons.lang.StringUtils; import org.springframework.util.Assert; /** * Dao - * * @author SHOP++ Team * @version 3.0 */ public abstract class BaseDaoImpl<T, ID extends Serializable> implements BaseDao<T, ID> { /** */ private Class<T> entityClass; /** ?? */ private static volatile long aliasCount = 0; @PersistenceContext protected EntityManager entityManager; @SuppressWarnings("unchecked") public BaseDaoImpl() { Type type = getClass().getGenericSuperclass(); Type[] parameterizedType = ((ParameterizedType) type).getActualTypeArguments(); entityClass = (Class<T>) parameterizedType[0]; } public T find(ID id) { if (id != null) { return entityManager.find(entityClass, id); } return null; } public T find(ID id, LockModeType lockModeType) { if (id != null) { if (lockModeType != null) { return entityManager.find(entityClass, id, lockModeType); } else { return entityManager.find(entityClass, id); } } return null; } public List<T> findList(Integer first, Integer count, List<Filter> filters, List<Order> orders) { CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); CriteriaQuery<T> criteriaQuery = criteriaBuilder.createQuery(entityClass); criteriaQuery.select(criteriaQuery.from(entityClass)); return findList(criteriaQuery, first, count, filters, orders); } public Page<T> findPage(Pageable pageable) { CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); CriteriaQuery<T> criteriaQuery = criteriaBuilder.createQuery(entityClass); criteriaQuery.select(criteriaQuery.from(entityClass)); return findPage(criteriaQuery, pageable); } public long count(Filter... filters) { CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); CriteriaQuery<T> criteriaQuery = criteriaBuilder.createQuery(entityClass); criteriaQuery.select(criteriaQuery.from(entityClass)); return count(criteriaQuery, filters != null ? Arrays.asList(filters) : null); } public void persist(T entity) { Assert.notNull(entity); entityManager.persist(entity); } public T merge(T entity) { Assert.notNull(entity); return entityManager.merge(entity); } public void remove(T entity) { if (entity != null) { entityManager.remove(entity); } } public void refresh(T entity) { if (entity != null) { entityManager.refresh(entity); } } public void refresh(T entity, LockModeType lockModeType) { if (entity != null) { if (lockModeType != null) { entityManager.refresh(entity, lockModeType); } else { entityManager.refresh(entity); } } } @SuppressWarnings("unchecked") public ID getIdentifier(T entity) { Assert.notNull(entity); return (ID) entityManager.getEntityManagerFactory().getPersistenceUnitUtil().getIdentifier(entity); } public boolean isManaged(T entity) { return entityManager.contains(entity); } public void detach(T entity) { entityManager.detach(entity); } public void lock(T entity, LockModeType lockModeType) { if (entity != null && lockModeType != null) { entityManager.lock(entity, lockModeType); } } public void clear() { entityManager.clear(); } public void flush() { entityManager.flush(); } protected List<T> findList(CriteriaQuery<T> criteriaQuery, Integer first, Integer count, List<Filter> filters, List<Order> orders) { Assert.notNull(criteriaQuery); Assert.notNull(criteriaQuery.getSelection()); Assert.notEmpty(criteriaQuery.getRoots()); CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); Root<T> root = getRoot(criteriaQuery); addRestrictions(criteriaQuery, filters); addOrders(criteriaQuery, orders); if (criteriaQuery.getOrderList().isEmpty()) { if (OrderEntity.class.isAssignableFrom(entityClass)) { criteriaQuery.orderBy(criteriaBuilder.asc(root.get(OrderEntity.ORDER_PROPERTY_NAME))); } else { criteriaQuery.orderBy(criteriaBuilder.desc(root.get(OrderEntity.CREATE_DATE_PROPERTY_NAME))); } } TypedQuery<T> query = entityManager.createQuery(criteriaQuery).setFlushMode(FlushModeType.COMMIT); if (first != null) { query.setFirstResult(first); } if (count != null) { query.setMaxResults(count); } return query.getResultList(); } protected Page<T> findPage(CriteriaQuery<T> criteriaQuery, Pageable pageable) { Assert.notNull(criteriaQuery); Assert.notNull(criteriaQuery.getSelection()); Assert.notEmpty(criteriaQuery.getRoots()); if (pageable == null) { pageable = new Pageable(); } CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); Root<T> root = getRoot(criteriaQuery); addRestrictions(criteriaQuery, pageable); addOrders(criteriaQuery, pageable); if (criteriaQuery.getOrderList().isEmpty()) { if (OrderEntity.class.isAssignableFrom(entityClass)) { criteriaQuery.orderBy(criteriaBuilder.asc(root.get(OrderEntity.ORDER_PROPERTY_NAME))); } else { criteriaQuery.orderBy(criteriaBuilder.desc(root.get(OrderEntity.CREATE_DATE_PROPERTY_NAME))); } } long total = count(criteriaQuery, null); int totalPages = (int) Math.ceil((double) total / (double) pageable.getPageSize()); if (totalPages < pageable.getPageNumber()) { pageable.setPageNumber(totalPages); } TypedQuery<T> query = entityManager.createQuery(criteriaQuery).setFlushMode(FlushModeType.COMMIT); query.setFirstResult((pageable.getPageNumber() - 1) * pageable.getPageSize()); query.setMaxResults(pageable.getPageSize()); return new Page<T>(query.getResultList(), total, pageable); } protected Long count(CriteriaQuery<T> criteriaQuery, List<Filter> filters) { Assert.notNull(criteriaQuery); Assert.notNull(criteriaQuery.getSelection()); Assert.notEmpty(criteriaQuery.getRoots()); CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); addRestrictions(criteriaQuery, filters); CriteriaQuery<Long> countCriteriaQuery = criteriaBuilder.createQuery(Long.class); for (Root<?> root : criteriaQuery.getRoots()) { Root<?> dest = countCriteriaQuery.from(root.getJavaType()); dest.alias(getAlias(root)); copyJoins(root, dest); } Root<?> countRoot = getRoot(countCriteriaQuery, criteriaQuery.getResultType()); countCriteriaQuery.select(criteriaBuilder.count(countRoot)); if (criteriaQuery.getGroupList() != null) { countCriteriaQuery.groupBy(criteriaQuery.getGroupList()); } if (criteriaQuery.getGroupRestriction() != null) { countCriteriaQuery.having(criteriaQuery.getGroupRestriction()); } if (criteriaQuery.getRestriction() != null) { countCriteriaQuery.where(criteriaQuery.getRestriction()); } return entityManager.createQuery(countCriteriaQuery).setFlushMode(FlushModeType.COMMIT).getSingleResult(); } private synchronized String getAlias(Selection<?> selection) { if (selection != null) { String alias = selection.getAlias(); if (alias == null) { if (aliasCount >= 1000) { aliasCount = 0; } alias = "groupbuyGeneratedAlias" + aliasCount++; selection.alias(alias); } return alias; } return null; } private Root<T> getRoot(CriteriaQuery<T> criteriaQuery) { if (criteriaQuery != null) { return getRoot(criteriaQuery, criteriaQuery.getResultType()); } return null; } private Root<T> getRoot(CriteriaQuery<?> criteriaQuery, Class<T> clazz) { if (criteriaQuery != null && criteriaQuery.getRoots() != null && clazz != null) { for (Root<?> root : criteriaQuery.getRoots()) { if (clazz.equals(root.getJavaType())) { return (Root<T>) root.as(clazz); } } } return null; } private void copyJoins(From<?, ?> from, From<?, ?> to) { for (Join<?, ?> join : from.getJoins()) { Join<?, ?> toJoin = to.join(join.getAttribute().getName(), join.getJoinType()); toJoin.alias(getAlias(join)); copyJoins(join, toJoin); } for (Fetch<?, ?> fetch : from.getFetches()) { Fetch<?, ?> toFetch = to.fetch(fetch.getAttribute().getName()); copyFetches(fetch, toFetch); } } private void copyFetches(Fetch<?, ?> from, Fetch<?, ?> to) { for (Fetch<?, ?> fetch : from.getFetches()) { Fetch<?, ?> toFetch = to.fetch(fetch.getAttribute().getName()); copyFetches(fetch, toFetch); } } private void addRestrictions(CriteriaQuery<T> criteriaQuery, List<Filter> filters) { if (criteriaQuery == null || filters == null || filters.isEmpty()) { return; } Root<T> root = getRoot(criteriaQuery); if (root == null) { return; } CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); Predicate restrictions = criteriaQuery.getRestriction() != null ? criteriaQuery.getRestriction() : criteriaBuilder.conjunction(); for (Filter filter : filters) { if (filter == null || StringUtils.isEmpty(filter.getProperty())) { continue; } if (filter.getOperator() == Operator.eq && filter.getValue() != null) { if (filter.getIgnoreCase() != null && filter.getIgnoreCase() && filter.getValue() instanceof String) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.equal(criteriaBuilder.lower(root.<String>get(filter.getProperty())), ((String) filter.getValue()).toLowerCase())); } else { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.equal(root.get(filter.getProperty()), filter.getValue())); } } else if (filter.getOperator() == Operator.ne && filter.getValue() != null) { if (filter.getIgnoreCase() != null && filter.getIgnoreCase() && filter.getValue() instanceof String) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.notEqual(criteriaBuilder.lower(root.<String>get(filter.getProperty())), ((String) filter.getValue()).toLowerCase())); } else { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.notEqual(root.get(filter.getProperty()), filter.getValue())); } } else if (filter.getOperator() == Operator.gt && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.gt(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.lt && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.lt(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.ge && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.ge(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.le && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.le(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.like && filter.getValue() != null && filter.getValue() instanceof String) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.like(root.<String>get(filter.getProperty()), (String) filter.getValue())); } else if (filter.getOperator() == Operator.in && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, root.get(filter.getProperty()).in(filter.getValue())); } else if (filter.getOperator() == Operator.isNull) { restrictions = criteriaBuilder.and(restrictions, root.get(filter.getProperty()).isNull()); } else if (filter.getOperator() == Operator.isNotNull) { restrictions = criteriaBuilder.and(restrictions, root.get(filter.getProperty()).isNotNull()); } } criteriaQuery.where(restrictions); } private void addRestrictions(CriteriaQuery<T> criteriaQuery, Pageable pageable) { if (criteriaQuery == null || pageable == null) { return; } Root<T> root = getRoot(criteriaQuery); if (root == null) { return; } CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); Predicate restrictions = criteriaQuery.getRestriction() != null ? criteriaQuery.getRestriction() : criteriaBuilder.conjunction(); if (StringUtils.isNotEmpty(pageable.getSearchProperty()) && StringUtils.isNotEmpty(pageable.getSearchValue())) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder .like(root.<String>get(pageable.getSearchProperty()), "%" + pageable.getSearchValue() + "%")); } if (pageable.getFilters() != null) { for (Filter filter : pageable.getFilters()) { if (filter == null || StringUtils.isEmpty(filter.getProperty())) { continue; } if (filter.getOperator() == Operator.eq && filter.getValue() != null) { if (filter.getIgnoreCase() != null && filter.getIgnoreCase() && filter.getValue() instanceof String) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.equal(criteriaBuilder.lower(root.<String>get(filter.getProperty())), ((String) filter.getValue()).toLowerCase())); } else { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.equal(root.get(filter.getProperty()), filter.getValue())); } } else if (filter.getOperator() == Operator.ne && filter.getValue() != null) { if (filter.getIgnoreCase() != null && filter.getIgnoreCase() && filter.getValue() instanceof String) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.notEqual( criteriaBuilder.lower(root.<String>get(filter.getProperty())), ((String) filter.getValue()).toLowerCase())); } else { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.notEqual(root.get(filter.getProperty()), filter.getValue())); } } else if (filter.getOperator() == Operator.gt && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.gt(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.lt && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.lt(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.ge && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.ge(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.le && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder.le(root.<Number>get(filter.getProperty()), (Number) filter.getValue())); } else if (filter.getOperator() == Operator.like && filter.getValue() != null && filter.getValue() instanceof String) { restrictions = criteriaBuilder.and(restrictions, criteriaBuilder .like(root.<String>get(filter.getProperty()), (String) filter.getValue())); } else if (filter.getOperator() == Operator.in && filter.getValue() != null) { restrictions = criteriaBuilder.and(restrictions, root.get(filter.getProperty()).in(filter.getValue())); } else if (filter.getOperator() == Operator.isNull) { restrictions = criteriaBuilder.and(restrictions, root.get(filter.getProperty()).isNull()); } else if (filter.getOperator() == Operator.isNotNull) { restrictions = criteriaBuilder.and(restrictions, root.get(filter.getProperty()).isNotNull()); } } } criteriaQuery.where(restrictions); } private void addOrders(CriteriaQuery<T> criteriaQuery, List<Order> orders) { if (criteriaQuery == null || orders == null || orders.isEmpty()) { return; } Root<T> root = getRoot(criteriaQuery); if (root == null) { return; } CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); List<javax.persistence.criteria.Order> orderList = new ArrayList<javax.persistence.criteria.Order>(); if (!criteriaQuery.getOrderList().isEmpty()) { orderList.addAll(criteriaQuery.getOrderList()); } for (Order order : orders) { if (order.getDirection() == Direction.asc) { orderList.add(criteriaBuilder.asc(root.get(order.getProperty()))); } else if (order.getDirection() == Direction.desc) { orderList.add(criteriaBuilder.desc(root.get(order.getProperty()))); } } criteriaQuery.orderBy(orderList); } private void addOrders(CriteriaQuery<T> criteriaQuery, Pageable pageable) { if (criteriaQuery == null || pageable == null) { return; } Root<T> root = getRoot(criteriaQuery); if (root == null) { return; } CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); List<javax.persistence.criteria.Order> orderList = new ArrayList<javax.persistence.criteria.Order>(); if (!criteriaQuery.getOrderList().isEmpty()) { orderList.addAll(criteriaQuery.getOrderList()); } if (StringUtils.isNotEmpty(pageable.getOrderProperty()) && pageable.getOrderDirection() != null) { if (pageable.getOrderDirection() == Direction.asc) { orderList.add(criteriaBuilder.asc(root.get(pageable.getOrderProperty()))); } else if (pageable.getOrderDirection() == Direction.desc) { orderList.add(criteriaBuilder.desc(root.get(pageable.getOrderProperty()))); } } if (pageable.getOrders() != null) { for (Order order : pageable.getOrders()) { if (order.getDirection() == Direction.asc) { orderList.add(criteriaBuilder.asc(root.get(order.getProperty()))); } else if (order.getDirection() == Direction.desc) { orderList.add(criteriaBuilder.desc(root.get(order.getProperty()))); } } } criteriaQuery.orderBy(orderList); } }