001/*
002  GRANITE DATA SERVICES
003  Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004
005  This file is part of Granite Data Services.
006
007  Granite Data Services is free software; you can redistribute it and/or modify
008  it under the terms of the GNU Library General Public License as published by
009  the Free Software Foundation; either version 2 of the License, or (at your
010  option) any later version.
011
012  Granite Data Services is distributed in the hope that it will be useful, but
013  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015  for more details.
016
017  You should have received a copy of the GNU Library General Public License
018  along with this library; if not, see <http://www.gnu.org/licenses/>.
019*/
020
021package org.granite.tide.spring.data;
022
023import java.io.Serializable;
024import java.util.Map;
025
026import javax.persistence.EntityManager;
027import javax.persistence.metamodel.ManagedType;
028
029import org.springframework.data.domain.Page;
030import org.springframework.data.domain.Pageable;
031import org.springframework.data.jpa.domain.Specification;
032import org.springframework.data.jpa.repository.support.JpaEntityInformation;
033import org.springframework.data.jpa.repository.support.JpaEntityInformationSupport;
034import org.springframework.data.jpa.repository.support.SimpleJpaRepository;
035
036
037public class FilterableJpaRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements FilterableJpaRepository<T, ID> {
038
039        private JpaEntityInformation<T, ?> entityInformation;
040        private EntityManager entityManager;
041
042        public FilterableJpaRepositoryImpl(Class<T> domainClass, EntityManager entityManager) {
043                super(domainClass, entityManager);
044                
045                this.entityInformation = JpaEntityInformationSupport.getMetadata(domainClass, entityManager);
046            this.entityManager = entityManager;
047        }
048        
049        @SuppressWarnings("unchecked")
050        public Page<T> findByFilter(Object filter, Pageable pageable) {
051                if (filter == null)
052                        return findAll(pageable);
053                
054                ManagedType<?> filterType = entityManager.getMetamodel().managedType(entityInformation.getJavaType());            
055                Specification<T> specification = null;
056                
057                if (filter.getClass().equals(filterType.getJavaType()))
058                        specification = FilterExampleSpecification.byExample(entityManager.getMetamodel(), filter);             
059                else if (filter instanceof Map<?, ?>)
060                        specification = FilterMapSpecification.byMap((Map<String, Object>)filter);
061                else
062                        specification = FilterBeanSpecification.byBean(filter);
063                
064                return findAll(specification, pageable);
065        }
066}