82 lines
2.7 KiB
Java
82 lines
2.7 KiB
Java
/*
|
|
* Copyright (C) 2017 LibreCCM Foundation.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
* MA 02110-1301 USA
|
|
*/
|
|
package org.librecms.ui;
|
|
|
|
import com.vaadin.cdi.ViewScoped;
|
|
import com.vaadin.data.provider.AbstractBackEndDataProvider;
|
|
import com.vaadin.data.provider.Query;
|
|
import org.libreccm.pagemodel.PageModel;
|
|
|
|
import java.util.stream.Stream;
|
|
|
|
import javax.inject.Inject;
|
|
import javax.persistence.EntityManager;
|
|
import javax.persistence.criteria.CriteriaBuilder;
|
|
import javax.persistence.criteria.CriteriaQuery;
|
|
import javax.persistence.criteria.Root;
|
|
|
|
/**
|
|
*
|
|
* @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
|
|
*/
|
|
@ViewScoped
|
|
class PageModelSelectDataProvider
|
|
extends AbstractBackEndDataProvider<PageModel, String> {
|
|
|
|
private static final long serialVersionUID = 3102935928982631262L;
|
|
|
|
@Inject
|
|
private EntityManager entityManager;
|
|
|
|
@Override
|
|
protected Stream<PageModel> fetchFromBackEnd(
|
|
final Query<PageModel, String> query) {
|
|
|
|
final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
|
|
final CriteriaQuery<PageModel> criteriaQuery = builder
|
|
.createQuery(PageModel.class);
|
|
final Root<PageModel> from = criteriaQuery.from(PageModel.class);
|
|
criteriaQuery.select(from);
|
|
|
|
return entityManager
|
|
.createQuery(criteriaQuery)
|
|
.setFirstResult(query.getOffset())
|
|
.setMaxResults(query.getLimit())
|
|
.getResultList()
|
|
.stream();
|
|
}
|
|
|
|
@Override
|
|
protected int sizeInBackEnd(final Query<PageModel, String> query) {
|
|
|
|
final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
|
|
final CriteriaQuery<Long> criteriaQuery = builder
|
|
.createQuery(Long.class);
|
|
final Root<PageModel> from = criteriaQuery.from(PageModel.class);
|
|
|
|
criteriaQuery.select(builder.count(from));
|
|
|
|
return entityManager
|
|
.createQuery(criteriaQuery)
|
|
.getSingleResult()
|
|
.intValue();
|
|
}
|
|
|
|
}
|