1 /*
2 * Copyright (c) 2000, 2004, 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 Arrays.sort(recs, new Comparator<RuleRec>() {
110 public int compare(RuleRec r1, RuleRec r2) {
111 int n = r1.getMonthNum() - r2.getMonthNum();
112 if (n != 0) {
113 return n;
114 }
115 // TODO: it's not accurate to ignore time types (STD, WALL, UTC)
116 long t1 = Time.getLocalTime(y, r1.getMonth(),
117 r1.getDay(), r1.getTime().getTime());
118 long t2 = Time.getLocalTime(y, r2.getMonth(),
119 r2.getDay(), r2.getTime().getTime());
120 return (int)(t1 - t2);
121 }
122 public boolean equals(Object o) {
123 return this == o;
124 }
125 });
126 rules.clear();
127 for (int i = 0; i < n; i++) {
128 rules.add(recs[i]);
129 }
130 return rules;
131 }
132
133 /**
134 * Gets rule records that have either "max" or cover the endYear
135 * value in its DST schedule.
136 *
137 * @return rules that contain last DST schedule. An empty
138 * ArrayList is returned if no last rules are found.
139 */
140 List<RuleRec> getLastRules() {
141 RuleRec start = null;
142 RuleRec end = null;
143
144 for (int i = 0; i < list.size(); i++) {
145 RuleRec rec = list.get(i);
146 if (rec.isLastRule()) {
147 if (rec.getSave() > 0) {
148 start = rec;
149 } else {
150 end = rec;
151 }
152 }
153 }
154 if (start == null || end == null) {
155 int endYear = Zoneinfo.getEndYear();
156 for (int i = 0; i < list.size(); i++) {
157 RuleRec rec = list.get(i);
158 if (endYear >= rec.getFromYear() && endYear <= rec.getToYear()) {
159 if (start == null && rec.getSave() > 0) {
160 start = rec;
161 } else {
162 if (end == null && rec.getSave() == 0) {
163 end = rec;
164 }
165 }
166 }
167 }
168 }
169
170 List<RuleRec> r = new ArrayList<RuleRec>(2);
171 if (start == null || end == null) {
172 if (start != null || end != null) {
173 Main.warning("found last rules for "+name+" inconsistent.");
174 }
175 return r;
176 }
177
178 r.add(start);
179 r.add(end);
180 return r;
181 }
182 }