01: /*
02: * @(#)BackEnd.java 1.7 06/10/10
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: */
26:
27: package sun.tools.javazic;
28:
29: /**
30: * <code>BackEnd</code> is an abstract base class for a back-end of compiling
31: * Olson's zoneinfo database and generating Java zoneinfo database.
32: *
33: * @since 1.4
34: */
35: abstract class BackEnd {
36:
37: /**
38: * Receives each zone's TimeZone information which was created by
39: * {@link Zoneinfo#parse} in class <code>Zoneinfo</code>,
40: * and processes it.
41: * @param tz Timezone object for each zone
42: * @return 0 if no error occurred, otherwise 1.
43: */
44: abstract int processZoneinfo(Timezone tz);
45:
46: /**
47: * Receives whole information which is generated by JavaZic's front-end
48: * in the form of Mapping object and generates total Java zone information
49: * file.
50: * @param m Mappings object which is generated by {@link Main#compile Main.compile()}.
51: * @return 0 if no error occurred, otherwise 1.
52: */
53: abstract int generateSrc(Mappings m);
54:
55: /**
56: * Decides which backend class should be used and returns its instance.
57: * @return an instance of backend class
58: */
59: static BackEnd getBackEnd() {
60: if (Zoneinfo.isYearForTimeZoneDataSpecified) {
61: return new Simple();
62: } else if (Main.outputSrc) {
63: return new GenSrc();
64: } else if (Main.outputDoc) {
65: return new GenDoc();
66: } else {
67: return new Gen();
68: }
69: }
70: }
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