/**
* GRANITE DATA SERVICES
* Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
*
* This file is part of the Granite Data Services Platform.
*
* Granite Data Services 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.
*
* Granite Data Services 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, or see <http://www.gnu.org/licenses/>.
*/
package org.granite.tide.spring.data;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import org.springframework.data.jpa.domain.Specification;
public class FilterMapSpecification<T> implements Specification<T> {
private Map<String, Object> filter;
private FilterMapSpecification(Map<String, Object> filter) {
this.filter = filter;
}
public static <T> FilterMapSpecification<T> byMap(Map<String, Object> filter) {
return new FilterMapSpecification<T>(filter);
}
public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder builder) {
List<Predicate> predicates = new ArrayList<Predicate>();
// Query by map filter
for (Entry<String, Object> entry : filter.entrySet()) {
if (root.get(entry.getKey()) == null)
throw new RuntimeException("Invalid filter mapping, path: " + entry.getKey());
Predicate predicate = FilterSpecUtil.buildPredicate(root, builder, null, entry.getKey(), entry.getValue());
if (predicate != null)
predicates.add(predicate);
}
if (predicates.size() > 0)
return builder.and(predicates.toArray(new Predicate[predicates.size()]));
return null;
}
}