1 | /* This file is part of the project "Hilbert II" - http://www.qedeq.org |
2 | * |
3 | * Copyright 2000-2014, Michael Meyling <mime@qedeq.org>. |
4 | * |
5 | * "Hilbert II" is free software; you can redistribute |
6 | * it and/or modify it under the terms of the GNU General Public |
7 | * License as published by the Free Software Foundation; either |
8 | * version 2 of the License, or (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | */ |
15 | |
16 | package org.qedeq.kernel.bo.common; |
17 | |
18 | import java.net.URLConnection; |
19 | |
20 | import org.qedeq.base.utility.YodaUtility; |
21 | |
22 | |
23 | /** |
24 | * This class provides basic informations about the kernel. |
25 | * |
26 | * @author Michael Meyling |
27 | */ |
28 | public final class BasicKernel implements KernelProperties { |
29 | |
30 | |
31 | /** Version of this kernel. */ |
32 | private static final String KERNEL_VERSION = "0.04.08"; |
33 | |
34 | /** Version dependent directory of this kernel. */ |
35 | private static final String KERNEL_VERSION_DIRECTORY = KERNEL_VERSION.replace('.', '_'); |
36 | |
37 | /** Version code . */ |
38 | private static final String KERNEL_CODE_NAME = "gaffsie"; |
39 | |
40 | /** Kernel version dedication. */ |
41 | private static final String KERNEL_DEDICATED |
42 | = "dedicated to Balsa, a spear woman and mercenary from Kanbal, the kingdom across the mountains."; |
43 | |
44 | /** Descriptive version information of this kernel. */ |
45 | private static final String DESCRIPTIVE_KERNEL_VERSION |
46 | = "Hilbert II - Version " + KERNEL_VERSION + " (" + KERNEL_CODE_NAME + ") [" |
47 | + getBuildIdFromManifest() + "] " + KERNEL_DEDICATED; |
48 | |
49 | /** Maximal supported rule version of this kernel. */ |
50 | private static final String MAXIMAL_RULE_VERSION = "1.01.00"; |
51 | |
52 | /** |
53 | * Constructor. |
54 | */ |
55 | public BasicKernel() { |
56 | // nothing to do |
57 | } |
58 | |
59 | /** |
60 | * Get build information from JAR manifest file. Is also non empty string if no manifest |
61 | * information is available. |
62 | * |
63 | * @return Implementation-version. |
64 | */ |
65 | private static String getBuildIdFromManifest() { |
66 | String build = BasicKernel.class.getPackage().getImplementationVersion(); |
67 | if (build == null) { |
68 | build = "no regular build"; |
69 | } |
70 | return build; |
71 | } |
72 | |
73 | public String getBuildId() { |
74 | return getBuildIdFromManifest(); |
75 | } |
76 | |
77 | public final String getKernelVersion() { |
78 | return KERNEL_VERSION; |
79 | } |
80 | |
81 | public final String getKernelCodeName() { |
82 | return KERNEL_CODE_NAME; |
83 | } |
84 | |
85 | public final String getKernelVersionDirectory() { |
86 | return KERNEL_VERSION_DIRECTORY; |
87 | } |
88 | |
89 | public final String getDescriptiveKernelVersion() { |
90 | return DESCRIPTIVE_KERNEL_VERSION; |
91 | } |
92 | |
93 | public final String getDedication() { |
94 | return KERNEL_DEDICATED; |
95 | } |
96 | |
97 | public final String getMaximalRuleVersion() { |
98 | return MAXIMAL_RULE_VERSION; |
99 | } |
100 | |
101 | public final boolean isRuleVersionSupported(final String ruleVersion) { |
102 | // FIXME 20130113 m31: this must change if we really want to use it |
103 | return MAXIMAL_RULE_VERSION.equals(ruleVersion); |
104 | } |
105 | |
106 | /** |
107 | * This class ist just for solving the lazy loading problem thread save. |
108 | * see <a href="http://en.wikipedia.org/wiki/Initialization_on_demand_holder_idiom"> |
109 | * Initialization_on_demand_holder_idiom</a>. |
110 | */ |
111 | private static final class LazyHolderTimeoutMethods { |
112 | |
113 | /** Lazy initialized constant that knows about the existence of the method |
114 | * <code>URLConnection.setConnectTimeout</code>. This depends on the currently running |
115 | * JVM. */ |
116 | private static final boolean IS_SET_CONNECTION_TIMEOUT_SUPPORTED = YodaUtility.existsMethod( |
117 | URLConnection.class, "setConnectTimeout", |
118 | new Class[] {Integer.TYPE}); |
119 | |
120 | /** Lazy initialized constant that knows about the existence of the method |
121 | * <code>URLConnection.setReadTimeout</code>. This depends on the currently running |
122 | * JVM. */ |
123 | private static final boolean IS_SET_READ_TIMEOUT_SUSPPORTED = YodaUtility.existsMethod( |
124 | URLConnection.class, "setReadTimeout", |
125 | new Class[] {Integer.TYPE}); |
126 | |
127 | /** |
128 | * Hidden constructor. |
129 | */ |
130 | private LazyHolderTimeoutMethods() { |
131 | // nothing to do |
132 | } |
133 | |
134 | } |
135 | |
136 | public boolean isSetConnectionTimeOutSupported() { |
137 | return LazyHolderTimeoutMethods.IS_SET_CONNECTION_TIMEOUT_SUPPORTED; |
138 | } |
139 | |
140 | public boolean isSetReadTimeoutSupported() { |
141 | return LazyHolderTimeoutMethods.IS_SET_READ_TIMEOUT_SUSPPORTED; |
142 | } |
143 | |
144 | } |