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.spring.data;
023
024 import java.lang.reflect.Field;
025 import java.lang.reflect.Type;
026 import java.util.ArrayList;
027 import java.util.List;
028
029 import org.granite.messaging.amf.io.convert.Converter;
030 import org.granite.messaging.amf.io.convert.Converters;
031 import org.granite.messaging.amf.io.convert.Reverter;
032 import org.granite.tide.data.model.PageInfo;
033 import org.granite.tide.data.model.SortInfo;
034 import org.springframework.data.domain.Page;
035 import org.springframework.data.domain.Pageable;
036 import org.springframework.data.domain.Sort;
037 import org.springframework.data.domain.Sort.Direction;
038 import org.springframework.data.domain.Sort.Order;
039
040
041 public 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 }