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 */
022package org.granite.spring.data;
023
024import java.lang.reflect.Field;
025import java.lang.reflect.Type;
026import java.util.ArrayList;
027import java.util.List;
028
029import org.granite.messaging.amf.io.convert.Converter;
030import org.granite.messaging.amf.io.convert.Converters;
031import org.granite.messaging.amf.io.convert.Reverter;
032import org.granite.tide.data.model.PageInfo;
033import org.granite.tide.data.model.SortInfo;
034import org.springframework.data.domain.Page;
035import org.springframework.data.domain.Pageable;
036import org.springframework.data.domain.Sort;
037import org.springframework.data.domain.Sort.Direction;
038import org.springframework.data.domain.Sort.Order;
039
040
041public class PageableConverter extends Converter implements Reverter {
042        
043        public PageableConverter(Converters converters) {
044                super(converters);
045        }
046
047        @Override
048        protected boolean internalCanConvert(Object value, Type targetType) {
049                return (value instanceof PageInfo && targetType.equals(Pageable.class))
050                        || (value instanceof SortInfo && targetType.equals(Sort.class));
051        }
052
053        @Override
054        protected Object internalConvert(Object value, Type targetType) {
055                if (targetType.equals(Pageable.class)) {
056                        PageInfo pageInfo = (PageInfo)value;
057                        Sort sort = null;
058                        if (pageInfo.getSortInfo() != null && pageInfo.getSortInfo().getOrder() != null && pageInfo.getSortInfo().getOrder().length > 0) {
059                                List<Order> orders = new ArrayList<Order>(pageInfo.getSortInfo().getOrder().length);
060                                for (int i = 0; i < pageInfo.getSortInfo().getOrder().length; i++)
061                                        orders.add(new Order(pageInfo.getSortInfo().getDesc()[i] ? Direction.DESC : Direction.ASC, pageInfo.getSortInfo().getOrder()[i]));                      
062                                sort = new Sort(orders);                        
063                        }
064                        return new OffsetPageRequest(pageInfo.getFirstResult(), pageInfo.getMaxResults(), sort);
065                }
066                return null;
067        }
068
069        public boolean canRevert(Object value) {
070                return value instanceof Page;
071        }
072
073        public Object revert(Object value) {
074                @SuppressWarnings("unchecked")
075                Page<Object> page = (Page<Object>)value;
076                int offset = page.getNumber() * page.getSize();
077                try {
078                        Field f = page.getClass().getDeclaredField("pageable");
079                        f.setAccessible(true);
080                        Pageable pageable = (Pageable)f.get(page);
081                        offset = pageable.getOffset();
082                }
083                catch (Exception e) {
084                }
085                return new org.granite.tide.data.model.Page<Object>(offset, page.getSize(), Long.valueOf(page.getTotalElements()).intValue(), page.getContent());
086        }
087}