1 /*
2 * Copyright (c) 2000, 2018, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.util.ArrayList;
25 import java.util.Arrays;
26 import java.util.Comparator;
27 import java.util.List;
28 import java.util.StringTokenizer;
29
30 /**
31 * Rule manipulates Rule records.
32 *
33 * @since 1.4
34 */
35 class Rule {
36
37 private List<RuleRec> list;
38 private String name;
39
40 /**
41 * Constructs a Rule which consists of a Rule record list. The
42 * specified name is given to this Rule.
43 * @param name the Rule name
44 */
45 Rule(String name) {
46 this.name = name;
47 list = new ArrayList<RuleRec>();
48 }
49
50 /**
51 * Added a RuleRec to the Rule record list.
52 */
53 void add(RuleRec rec) {
54 list.add(rec);
55 }
56
57 /**
58 * @return the Rule name
59 */
60 String getName() {
61 return name;
62 }
63
64 /**
65 * Gets all rule records that cover the given year.
66 *
67 * @param year the year number for which the rule is applicable.
68 * @return rules in List that are collated in time. If no rule is found, an empty
69 * List is returned.
70 */
71 List<RuleRec> getRules(int year) {
72 List<RuleRec> rules = new ArrayList<RuleRec>(3);
73 for (RuleRec rec : list) {
74 if (year >= rec.getFromYear() && year <= rec.getToYear()) {
75 if ((rec.isOdd() && year % 2 == 0) || (rec.isEven() && year % 2 == 1))
76 continue;
77 rules.add(rec);
78 }
79 }
80 int n = rules.size();
81 if (n <= 1) {
82 return rules;
83 }
84 if (n == 2) {
85 RuleRec rec1 = rules.get(0);
86 RuleRec rec2 = rules.get(1);
87 if (rec1.getMonthNum() > rec2.getMonthNum()) {
88 rules.set(0, rec2);
89 rules.set(1, rec1);
90 } else if (rec1.getMonthNum() == rec2.getMonthNum()) {
91 // TODO: it's not accurate to ignore time types (STD, WALL, UTC)
92 long t1 = Time.getLocalTime(year, rec1.getMonth(),
93 rec1.getDay(), rec1.getTime().getTime());
94 long t2 = Time.getLocalTime(year, rec2.getMonth(),
95 rec2.getDay(), rec2.getTime().getTime());
96 if (t1 > t2) {
97 rules.set(0, rec2);
98 rules.set(1, rec1);
99 }
100 }
101 return rules;
102 }
103
104 final int y = year;
105 RuleRec[] recs = new RuleRec[rules.size()];
106 rules.toArray(recs);
107
108 Arrays.sort(recs, new Comparator<RuleRec>() {
109 public int compare(RuleRec r1, RuleRec r2) {
110 int n = r1.getMonthNum() - r2.getMonthNum();
111 if (n != 0) {
112 return n;
113 }
114 // TODO: it's not accurate to ignore time types (STD, WALL, UTC)
115 long t1 = Time.getLocalTime(y, r1.getMonth(),
116 r1.getDay(), r1.getTime().getTime());
117 long t2 = Time.getLocalTime(y, r2.getMonth(),
118 r2.getDay(), r2.getTime().getTime());
119 return Long.compare(t1, t2);
120 }
121 public boolean equals(Object o) {
122 return this == o;
123 }
124 });
125 rules.clear();
126 for (int i = 0; i < n; i++) {
127 if (i != 0 && recs[i -1].getSave() == recs[i].getSave()) {
128 // we have two recs back to back with same saving for the same year.
129 if (recs[i].isLastRule()) {
130 continue;
131 } else if (recs[i - 1].isLastRule()) {
132 rules.remove(rules.size() - 1);
133 }
134 }
135 rules.add(recs[i]);
136 }
137 return rules;
138 }
139
140 /**
141 * Gets rule records that have either "max" or cover the endYear
142 * value in its DST schedule.
143 *
144 * @return rules that contain last DST schedule. An empty
145 * ArrayList is returned if no last rules are found.
146 */
147 List<RuleRec> getLastRules() {
148 RuleRec start = null;
149 RuleRec end = null;
150
151 for (int i = 0; i < list.size(); i++) {
152 RuleRec rec = list.get(i);
153 if (rec.isLastRule()) {
154 if (rec.getSave() > 0) {
155 start = rec;
156 } else {
157 end = rec;
158 }
159 }
160 }
161 if (start == null || end == null) {
162 int endYear = Zoneinfo.getEndYear();
163 for (int i = 0; i < list.size(); i++) {
164 RuleRec rec = list.get(i);
165 if (endYear >= rec.getFromYear() && endYear <= rec.getToYear()) {
166 if (start == null && rec.getSave() > 0) {
167 start = rec;
168 } else {
169 if (end == null && rec.getSave() == 0) {
170 end = rec;
171 }
172 }
173 }
174 }
175 }
176
177 List<RuleRec> r = new ArrayList<RuleRec>(2);
178 if (start == null || end == null) {
179 if (start != null || end != null) {
180 Main.warning("found last rules for "+name+" inconsistent.");
181 }
182 return r;
183 }
184
185 r.add(start);
186 r.add(end);
187 return r;
188 }
189 }