1 /*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 import java.util.ArrayList;
27 import java.util.Arrays;
28 import java.util.Comparator;
29 import java.util.List;
30 import java.util.StringTokenizer;
31
32 /**
33 * Rule manipulates Rule records.
34 *
35 * @since 1.4
36 */
37 class Rule {
38
39 private List<RuleRec> list;
40 private String name;
41
42 /**
43 * Constructs a Rule which consists of a Rule record list. The
44 * specified name is given to this Rule.
45 * @param name the Rule name
46 */
47 Rule(String name) {
48 this.name = name;
49 list = new ArrayList<RuleRec>();
50 }
51
52 /**
53 * Added a RuleRec to the Rule record list.
54 */
55 void add(RuleRec rec) {
56 list.add(rec);
57 }
58
59 /**
60 * @return the Rule name
61 */
62 String getName() {
63 return name;
64 }
65
66 /**
67 * Gets all rule records that cover the given year.
68 *
69 * @param year the year number for which the rule is applicable.
70 * @return rules in List that are collated in time. If no rule is found, an empty
71 * List is returned.
72 */
73 List<RuleRec> getRules(int year) {
74 List<RuleRec> rules = new ArrayList<RuleRec>(3);
75 for (RuleRec rec : list) {
76 if (year >= rec.getFromYear() && year <= rec.getToYear()) {
77 if ((rec.isOdd() && year % 2 == 0) || (rec.isEven() && year % 2 == 1))
78 continue;
79 rules.add(rec);
80 }
81 }
82 int n = rules.size();
83 if (n <= 1) {
84 return rules;
85 }
86 if (n == 2) {
87 RuleRec rec1 = rules.get(0);
88 RuleRec rec2 = rules.get(1);
89 if (rec1.getMonthNum() > rec2.getMonthNum()) {
90 rules.set(0, rec2);
91 rules.set(1, rec1);
92 } else if (rec1.getMonthNum() == rec2.getMonthNum()) {
93 // TODO: it's not accurate to ignore time types (STD, WALL, UTC)
94 long t1 = Time.getLocalTime(year, rec1.getMonth(),
95 rec1.getDay(), rec1.getTime().getTime());
96 long t2 = Time.getLocalTime(year, rec2.getMonth(),
97 rec2.getDay(), rec2.getTime().getTime());
98 if (t1 > t2) {
99 rules.set(0, rec2);
100 rules.set(1, rec1);
101 }
102 }
103 return rules;
104 }
105
106 final int y = year;
107 RuleRec[] recs = new RuleRec[rules.size()];
108 rules.toArray(recs);
109
110 Arrays.sort(recs, new Comparator<RuleRec>() {
111 public int compare(RuleRec r1, RuleRec r2) {
112 int n = r1.getMonthNum() - r2.getMonthNum();
113 if (n != 0) {
114 return n;
115 }
116 // TODO: it's not accurate to ignore time types (STD, WALL, UTC)
117 long t1 = Time.getLocalTime(y, r1.getMonth(),
118 r1.getDay(), r1.getTime().getTime());
119 long t2 = Time.getLocalTime(y, r2.getMonth(),
120 r2.getDay(), r2.getTime().getTime());
121 return Long.compare(t1, t2);
122 }
123 public boolean equals(Object o) {
124 return this == o;
125 }
126 });
127 rules.clear();
128 for (int i = 0; i < n; i++) {
129 if (i != 0 && recs[i -1].getSave() == recs[i].getSave()) {
130 // we have two recs back to back with same saving for the same year.
131 if (recs[i].isLastRule()) {
132 continue;
133 } else if (recs[i - 1].isLastRule()) {
134 rules.remove(rules.size() - 1);
135 }
136 }
137 rules.add(recs[i]);
138 }
139 return rules;
140 }
141
142 /**
143 * Gets rule records that have either "max" or cover the endYear
144 * value in its DST schedule.
145 *
146 * @return rules that contain last DST schedule. An empty
147 * ArrayList is returned if no last rules are found.
148 */
149 List<RuleRec> getLastRules() {
150 RuleRec start = null;
151 RuleRec end = null;
152
153 for (int i = 0; i < list.size(); i++) {
154 RuleRec rec = list.get(i);
155 if (rec.isLastRule()) {
156 if (rec.getSave() > 0) {
157 start = rec;
158 } else {
159 end = rec;
160 }
161 }
162 }
163 if (start == null || end == null) {
164 int endYear = Zoneinfo.getEndYear();
165 for (int i = 0; i < list.size(); i++) {
166 RuleRec rec = list.get(i);
167 if (endYear >= rec.getFromYear() && endYear <= rec.getToYear()) {
168 if (start == null && rec.getSave() > 0) {
169 start = rec;
170 } else {
171 if (end == null && rec.getSave() == 0) {
172 end = rec;
173 }
174 }
175 }
176 }
177 }
178
179 List<RuleRec> r = new ArrayList<RuleRec>(2);
180 if (start == null || end == null) {
181 if (start != null || end != null) {
182 Main.warning("found last rules for "+name+" inconsistent.");
183 }
184 return r;
185 }
186
187 r.add(start);
188 r.add(end);
189 return r;
190 }
191 }