Java tutorial
/** * Copyright (C) 2012-2015 52North Initiative for Geospatial Open Source * Software GmbH * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * If the program is linked with libraries which are licensed under one of * the following licenses, the combination of the program with the linked * library is not considered a "derivative work" of the program: * * - Apache License, version 2.0 * - Apache Software License, version 1.0 * - GNU Lesser General Public License, version 3 * - Mozilla Public License, versions 1.0, 1.1 and 2.0 * - Common Development and Distribution License (CDDL), version 1.0 * * Therefore the distribution of the program linked with libraries licensed * under the aforementioned licenses, is permitted by the copyright holders * if the distribution is compliant with both the GNU General Public * License version 2 and the aforementioned licenses. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. */ package org.n52.sos.ds.hibernate.dao.i18n; import java.util.Collection; import java.util.List; import java.util.Locale; import java.util.Map; import org.hibernate.Criteria; import org.hibernate.HibernateException; import org.hibernate.ScrollableResults; import org.hibernate.Session; import org.hibernate.Transaction; import org.hibernate.criterion.Projections; import org.hibernate.criterion.Restrictions; import org.n52.sos.ds.I18NDAO; import org.n52.sos.ds.hibernate.HibernateSessionHolder; import org.n52.sos.ds.hibernate.entities.AbstractIdentifierNameDescriptionEntity; import org.n52.sos.ds.hibernate.entities.i18n.AbstractHibernateI18NMetadata; import org.n52.sos.ds.hibernate.util.HibernateHelper; import org.n52.sos.i18n.LocalizedString; import org.n52.sos.i18n.metadata.AbstractI18NMetadata; import org.n52.sos.ogc.ows.OwsExceptionReport; import com.google.common.base.Optional; import com.google.common.collect.Maps; public abstract class AbstractHibernateI18NDAO<T extends AbstractIdentifierNameDescriptionEntity, S extends AbstractI18NMetadata, H extends AbstractHibernateI18NMetadata> implements I18NDAO<S>, HibernateI18NDAO<S> { private final HibernateSessionHolder sessionHolder = new HibernateSessionHolder(); @Override public S getMetadata(String id) throws OwsExceptionReport { Session session = null; try { session = sessionHolder.getSession(); return getMetadata(id, session); } finally { sessionHolder.returnSession(session); } } @Override public Collection<S> getMetadata(Collection<String> id) throws OwsExceptionReport { Session session = null; try { session = sessionHolder.getSession(); return getMetadata(id, session); } finally { sessionHolder.returnSession(session); } } @Override public S getMetadata(String id, Locale locale) throws OwsExceptionReport { Session session = null; try { session = sessionHolder.getSession(); return getMetadata(id, locale, session); } finally { sessionHolder.returnSession(session); } } @Override public Collection<S> getMetadata(Collection<String> id, Locale locale) throws OwsExceptionReport { Session session = null; try { session = sessionHolder.getSession(); return getMetadata(id, locale, session); } finally { sessionHolder.returnSession(session); } } @Override public Collection<S> getMetadata() throws OwsExceptionReport { Session session = null; try { session = sessionHolder.getSession(); return getMetadata(session); } finally { sessionHolder.returnSession(session); } } @Override public void saveMetadata(S i18n) throws OwsExceptionReport { Session session = null; try { session = sessionHolder.getSession(); saveMetadata(i18n, session); } finally { sessionHolder.returnSession(session); } } @Override public Collection<Locale> getAvailableLocales() throws OwsExceptionReport { Session session = null; try { session = sessionHolder.getSession(); return getAvailableLocales(session); } finally { sessionHolder.returnSession(session); } } @Override @SuppressWarnings("unchecked") public Collection<Locale> getAvailableLocales(Session session) throws OwsExceptionReport { Criteria criteria = session.createCriteria(getHibernateEntityClass()); criteria.setProjection(Projections.distinct(Projections.property(AbstractHibernateI18NMetadata.LOCALE))); return criteria.list(); } @Override @SuppressWarnings("unchecked") public S getMetadata(String id, Session session) throws OwsExceptionReport { Criteria criteria = session.createCriteria(getHibernateEntityClass()); criteria.createCriteria(AbstractHibernateI18NMetadata.OBJECT_ID) .add(Restrictions.eq(AbstractIdentifierNameDescriptionEntity.IDENTIFIER, id)); List<H> list = criteria.list(); return createSosObject(id, list); } @Override @SuppressWarnings("unchecked") public Collection<S> getMetadata(Collection<String> id, Session session) throws OwsExceptionReport { Criteria criteria = session.createCriteria(getHibernateEntityClass()); criteria.createCriteria(AbstractHibernateI18NMetadata.OBJECT_ID) .add(Restrictions.in(AbstractIdentifierNameDescriptionEntity.IDENTIFIER, id)); List<H> list = criteria.list(); return createSosObject(list); } @Override @SuppressWarnings("unchecked") public S getMetadata(String id, Locale locale, Session session) throws OwsExceptionReport { Criteria criteria = session.createCriteria(getHibernateEntityClass()); criteria.createCriteria(AbstractHibernateI18NMetadata.OBJECT_ID) .add(Restrictions.eq(AbstractIdentifierNameDescriptionEntity.IDENTIFIER, id)); criteria.add(Restrictions.eq(AbstractHibernateI18NMetadata.LOCALE, locale)); List<H> list = criteria.list(); return createSosObject(id, list); } @Override @SuppressWarnings("unchecked") public Collection<S> getMetadata(Collection<String> id, Locale locale, Session session) throws OwsExceptionReport { Criteria criteria = session.createCriteria(getHibernateEntityClass()); criteria.createCriteria(AbstractHibernateI18NMetadata.OBJECT_ID) .add(Restrictions.in(AbstractIdentifierNameDescriptionEntity.IDENTIFIER, id)); criteria.add(Restrictions.eq(AbstractHibernateI18NMetadata.LOCALE, locale)); List<H> list = criteria.list(); return createSosObject(list); } @Override @SuppressWarnings("unchecked") public Collection<S> getMetadata(Session session) throws OwsExceptionReport { Criteria criteria = session.createCriteria(getHibernateEntityClass()); List<H> list = criteria.list(); return createSosObject(list); } @Override public void saveMetadata(S i18n, Session session) throws OwsExceptionReport { Transaction transaction = null; try { transaction = session.beginTransaction(); deleteOldValues(i18n.getIdentifier(), session); T entity = getEntity(i18n.getIdentifier(), session); for (Locale locale : i18n.getLocales()) { H h18n = createHibernateObject(); h18n.setObjectId(entity); h18n.setLocale(locale); fillHibernateObject(i18n, h18n); session.save(h18n); } session.flush(); transaction.commit(); } catch (HibernateException e) { if (transaction != null) { transaction.rollback(); } throw e; } } @Override public boolean isSupported() { return HibernateHelper.isEntitySupported(getHibernateEntityClass()); } protected Collection<S> createSosObject(List<H> hi18ns) { Map<String, S> map = Maps.newHashMap(); for (H h18n : hi18ns) { String id = h18n.getObjectId().getIdentifier(); S i18n = map.get(id); if (i18n == null) { i18n = createSosObject(id); map.put(id, i18n); } fillSosObject(h18n, i18n); } return map.values(); } protected S createSosObject(String id, List<H> h18ns) { S i18n = createSosObject(id); for (H h18n : h18ns) { fillSosObject(h18n, i18n); } return i18n; } protected void deleteOldValues(String id, Session session) { Criteria criteria = session.createCriteria(getHibernateEntityClass()); criteria.createCriteria(AbstractHibernateI18NMetadata.OBJECT_ID) .add(Restrictions.eq(AbstractIdentifierNameDescriptionEntity.IDENTIFIER, id)); ScrollableResults scroll = null; try { scroll = criteria.scroll(); while (scroll.next()) { @SuppressWarnings("unchecked") H h18n = (H) scroll.get()[0]; session.delete(h18n); } } finally { if (scroll != null) { scroll.close(); } } session.flush(); } protected void fillSosObject(H h18n, S i18n) { if (h18n.isSetName()) { i18n.getName().addLocalization(h18n.getLocale(), h18n.getName()); } if (h18n.isSetDescription()) { i18n.getDescription().addLocalization(h18n.getLocale(), h18n.getDescription()); } } protected void fillHibernateObject(S i18n, H h18n) { Optional<LocalizedString> name = i18n.getName().getLocalization(h18n.getLocale()); if (name.isPresent()) { h18n.setName(name.get().getText()); } Optional<LocalizedString> description = i18n.getDescription().getLocalization(h18n.getLocale()); if (description.isPresent()) { h18n.setDescription(description.get().getText()); } } protected abstract T getEntity(String id, Session session); protected abstract Class<H> getHibernateEntityClass(); protected abstract H createHibernateObject(); protected abstract S createSosObject(String id); }