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.beans.BeanInfo;
025 import java.beans.Introspector;
026 import java.beans.PropertyDescriptor;
027 import java.util.ArrayList;
028 import java.util.List;
029
030 import javax.persistence.criteria.CriteriaBuilder;
031 import javax.persistence.criteria.CriteriaQuery;
032 import javax.persistence.criteria.Predicate;
033 import javax.persistence.criteria.Root;
034
035 import org.springframework.data.jpa.domain.Specification;
036
037 public class FilterBeanSpecification<T> implements Specification<T> {
038
039 private Object filter;
040
041 private FilterBeanSpecification(Object filter) {
042 this.filter = filter;
043 }
044
045 public static <T> FilterBeanSpecification<T> byBean(Object filter) {
046 return new FilterBeanSpecification<T>(filter);
047 }
048
049 public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder builder) {
050 List<Predicate> predicates = new ArrayList<Predicate>();
051
052 // Query by bean filter
053 PropertyDescriptor[] pds = null;
054 try {
055 BeanInfo info = Introspector.getBeanInfo(filter.getClass());
056 pds = info.getPropertyDescriptors();
057 }
058 catch (Exception e) {
059 throw new RuntimeException("Could not introspect filter bean", e);
060 }
061
062 for (PropertyDescriptor pd : pds) {
063 if (pd.getWriteMethod() == null || !pd.getReadMethod().isAnnotationPresent(FilterMapping.class) || pd.getReadMethod().getAnnotation(FilterMapping.class).mode() == FilterMode.EXCLUDE)
064 continue;
065
066 FilterMapping mapping = pd.getReadMethod().getAnnotation(FilterMapping.class);
067 if (root.get(mapping.value()) == null)
068 throw new RuntimeException("Invalid filter mapping, path: " + mapping.value());
069
070 Object value = null;
071 try {
072 value = pd.getReadMethod().invoke(filter);
073 }
074 catch (Exception e) {
075 throw new RuntimeException("Could not get filter property " + pd.getName(), e);
076 }
077
078 Predicate predicate = FilterSpecUtil.buildPredicate(root, builder, pd.getReadMethod().getReturnType(), mapping.value(), value);
079 if (predicate != null)
080 predicates.add(predicate);
081 }
082
083 if (predicates.size() > 0)
084 return builder.and(predicates.toArray(new Predicate[predicates.size()]));
085
086 return null;
087 }
088 }