| 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 | } |