001 /**
002 * GRANITE DATA SERVICES
003 * Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 * This file is part of the Granite Data Services Platform.
006 *
007 * Granite Data Services is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * Granite Data Services is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 * General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 * USA, or see <http://www.gnu.org/licenses/>.
021 */
022 package org.granite.tide.spring.data;
023
024 import java.util.ArrayList;
025 import java.util.List;
026 import java.util.Map;
027 import java.util.Map.Entry;
028
029 import javax.persistence.criteria.CriteriaBuilder;
030 import javax.persistence.criteria.CriteriaQuery;
031 import javax.persistence.criteria.Predicate;
032 import javax.persistence.criteria.Root;
033
034 import org.springframework.data.jpa.domain.Specification;
035
036 public class FilterMapSpecification<T> implements Specification<T> {
037
038 private Map<String, Object> filter;
039
040 private FilterMapSpecification(Map<String, Object> filter) {
041 this.filter = filter;
042 }
043
044 public static <T> FilterMapSpecification<T> byMap(Map<String, Object> filter) {
045 return new FilterMapSpecification<T>(filter);
046 }
047
048 public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder builder) {
049 List<Predicate> predicates = new ArrayList<Predicate>();
050
051 // Query by map filter
052 for (Entry<String, Object> entry : filter.entrySet()) {
053 if (root.get(entry.getKey()) == null)
054 throw new RuntimeException("Invalid filter mapping, path: " + entry.getKey());
055
056 Predicate predicate = FilterSpecUtil.buildPredicate(root, builder, null, entry.getKey(), entry.getValue());
057 if (predicate != null)
058 predicates.add(predicate);
059 }
060
061 if (predicates.size() > 0)
062 return builder.and(predicates.toArray(new Predicate[predicates.size()]));
063
064 return null;
065 }
066 }