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16 package com.ibatis.common.util;
17
18 import java.util.*;
19
20
23 public class PaginatedArrayList implements PaginatedList {
24
25 private static final ArrayList EMPTY_LIST = new ArrayList(0);
26
27 private List list;
28 private List page;
29 private int pageSize;
30 private int index;
31
32
35 public PaginatedArrayList(int pageSize) {
36 this.pageSize = pageSize;
37 this.index = 0;
38 this.list = new ArrayList();
39 repaginate();
40 }
41
42
47 public PaginatedArrayList(int initialCapacity, int pageSize) {
48 this.pageSize = pageSize;
49 this.index = 0;
50 this.list = new ArrayList(initialCapacity);
51 repaginate();
52 }
53
54
59 public PaginatedArrayList(Collection c, int pageSize) {
60 this.pageSize = pageSize;
61 this.index = 0;
62 this.list = new ArrayList(c);
63 repaginate();
64 }
65
66 private void repaginate() {
67 if (list.isEmpty()) {
68 page = EMPTY_LIST;
69 } else {
70 int start = index * pageSize;
71 int end = start + pageSize - 1;
72 if (end >= list.size()) {
73 end = list.size() - 1;
74 }
75 if (start >= list.size()) {
76 index = 0;
77 repaginate();
78 } else if (start < 0) {
79 index = list.size() / pageSize;
80 if (list.size() % pageSize == 0) {
81 index--;
82 }
83 repaginate();
84 } else {
85 page = list.subList(start, end + 1);
86 }
87 }
88 }
89
90
91
92 public int size() {
93 return page.size();
94 }
95
96 public boolean isEmpty() {
97 return page.isEmpty();
98 }
99
100 public boolean contains(Object  o) {
101 return page.contains(o);
102 }
103
104 public Iterator iterator() {
105 return page.iterator();
106 }
107
108 public Object [] toArray() {
109 return page.toArray();
110 }
111
112 public Object [] toArray(Object a[]) {
113 return page.toArray(a);
114 }
115
116 public boolean containsAll(Collection c) {
117 return page.containsAll(c);
118 }
119
120 public Object get(int index) {
121 return page.get(index);
122 }
123
124 public int indexOf(Object o) {
125 return page.indexOf(o);
126 }
127
128 public int lastIndexOf(Object o) {
129 return page.lastIndexOf(o);
130 }
131
132 public ListIterator listIterator() {
133 return page.listIterator();
134 }
135
136 public ListIterator listIterator(int index) {
137 return page.listIterator(index);
138 }
139
140 public List subList(int fromIndex, int toIndex) {
141 return page.subList(fromIndex, toIndex);
142 }
143
144
145
146 public boolean add(Object o) {
147 boolean b = list.add(o);
148 repaginate();
149 return b;
150 }
151
152 public boolean remove(Object o) {
153 boolean b = list.remove(o);
154 repaginate();
155 return b;
156 }
157
158 public boolean addAll(Collection c) {
159 boolean b = list.addAll(c);
160 repaginate();
161 return b;
162 }
163
164 public boolean addAll(int index, Collection c) {
165 boolean b = list.addAll(index, c);
166 repaginate();
167 return b;
168 }
169
170 public boolean removeAll(Collection c) {
171 boolean b = list.removeAll(c);
172 repaginate();
173 return b;
174 }
175
176 public boolean retainAll(Collection c) {
177 boolean b = list.retainAll(c);
178 repaginate();
179 return b;
180 }
181
182 public void clear() {
183 list.clear();
184 repaginate();
185 }
186
187 public Object set(int index, Object element) {
188 Object o = list.set(index, element);
189 repaginate();
190 return o;
191 }
192
193 public void add(int index, Object element) {
194 list.add(index, element);
195 repaginate();
196 }
197
198 public Object remove(int index) {
199 Object o = list.remove(index);
200 repaginate();
201 return o;
202 }
203
204
205
206 public int getPageSize() {
207 return pageSize;
208 }
209
210 public boolean isFirstPage() {
211 return index == 0;
212 }
213
214 public boolean isMiddlePage() {
215 return !(isFirstPage() || isLastPage());
216 }
217
218 public boolean isLastPage() {
219 return list.size() - ((index + 1) * pageSize) < 1;
220 }
221
222 public boolean isNextPageAvailable() {
223 return !isLastPage();
224 }
225
226 public boolean isPreviousPageAvailable() {
227 return !isFirstPage();
228 }
229
230 public boolean nextPage() {
231 if (isNextPageAvailable()) {
232 index++;
233 repaginate();
234 return true;
235 } else {
236 return false;
237 }
238 }
239
240 public boolean previousPage() {
241 if (isPreviousPageAvailable()) {
242 index--;
243 repaginate();
244 return true;
245 } else {
246 return false;
247 }
248 }
249
250 public void gotoPage(int pageNumber) {
251 index = pageNumber;
252 repaginate();
253 }
254
255 public int getPageIndex() {
256 return index;
257 }
258
259 }
260 |
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