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
021 package org.granite.spring.data;
022
023 import java.lang.reflect.Field;
024 import java.lang.reflect.Type;
025 import java.util.ArrayList;
026 import java.util.List;
027
028 import org.granite.messaging.amf.io.convert.Converter;
029 import org.granite.messaging.amf.io.convert.Converters;
030 import org.granite.messaging.amf.io.convert.Reverter;
031 import org.granite.tide.data.model.PageInfo;
032 import org.granite.tide.data.model.SortInfo;
033 import org.springframework.data.domain.Page;
034 import org.springframework.data.domain.Pageable;
035 import org.springframework.data.domain.Sort;
036 import org.springframework.data.domain.Sort.Direction;
037 import org.springframework.data.domain.Sort.Order;
038
039
040 public class PageableConverter extends Converter implements Reverter {
041
042 public PageableConverter(Converters converters) {
043 super(converters);
044 }
045
046 @Override
047 protected boolean internalCanConvert(Object value, Type targetType) {
048 return (value instanceof PageInfo && targetType.equals(Pageable.class))
049 || (value instanceof SortInfo && targetType.equals(Sort.class));
050 }
051
052 @Override
053 protected Object internalConvert(Object value, Type targetType) {
054 if (targetType.equals(Pageable.class)) {
055 PageInfo pageInfo = (PageInfo)value;
056 Sort sort = null;
057 if (pageInfo.getSortInfo() != null && pageInfo.getSortInfo().getOrder() != null && pageInfo.getSortInfo().getOrder().length > 0) {
058 List<Order> orders = new ArrayList<Order>(pageInfo.getSortInfo().getOrder().length);
059 for (int i = 0; i < pageInfo.getSortInfo().getOrder().length; i++)
060 orders.add(new Order(pageInfo.getSortInfo().getDesc()[i] ? Direction.DESC : Direction.ASC, pageInfo.getSortInfo().getOrder()[i]));
061 sort = new Sort(orders);
062 }
063 return new PageRequest(pageInfo.getFirstResult(), pageInfo.getMaxResults(), sort);
064 }
065 return null;
066 }
067
068 public boolean canRevert(Object value) {
069 return value instanceof Page;
070 }
071
072 public Object revert(Object value) {
073 @SuppressWarnings("unchecked")
074 Page<Object> page = (Page<Object>)value;
075 int offset = page.getNumber() * page.getSize();
076 try {
077 Field f = page.getClass().getDeclaredField("pageable");
078 f.setAccessible(true);
079 Pageable pageable = (Pageable)f.get(page);
080 offset = pageable.getOffset();
081 }
082 catch (Exception e) {
083 }
084 return new org.granite.tide.data.model.Page<Object>(offset, page.getSize(), Long.valueOf(page.getTotalElements()).intValue(), page.getContent());
085 }
086
087
088 public static class PageRequest implements Pageable {
089
090 private int offset;
091 private int pageSize;
092 private Sort sort;
093
094 public PageRequest(int offset, int pageSize, Sort sort) {
095 this.offset = offset;
096 this.pageSize = pageSize;
097 this.sort = sort;
098 }
099
100 public int getOffset() {
101 return offset;
102 }
103
104 public int getPageNumber() {
105 return pageSize > 0 ? offset / pageSize : 0;
106 }
107
108 public int getPageSize() {
109 return pageSize;
110 }
111
112 public Sort getSort() {
113 return sort;
114 }
115 }
116 }