| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.iapi.services.info.JVMInfo |
| 4 | |
| 5 | Copyright 1999, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.iapi.services.info; |
| 22 | |
| 23 | |
| 24 | /** |
| 25 | What's the current JDK runtime environment. |
| 26 | */ |
| 27 | public abstract class JVMInfo |
| 28 | { |
| 29 | /** |
| 30 | The JVM's runtime environment. |
| 31 | <UL> |
| 32 | <LI> 1 - not used was JDK 1.1 |
| 33 | <LI> 2 - J2SE_13- JDK 1.2, 1.3 |
| 34 | <LI> 4 - J2SE_14 - JDK 1.4.0 or 1.4.1 |
| 35 | <LI> 5 - J2SE_142 - JDK 1.4.2 |
| 36 | <LI> 6 - J2SE_15 - JDK 1.5 |
| 37 | </UL> |
| 38 | */ |
| 39 | public static final int JDK_ID; |
| 40 | |
| 41 | public static final int J2SE_13 = 2; |
| 42 | public static final int J2SE_14 = 4; |
| 43 | public static final int J2SE_142 = 5; |
| 44 | public static final int J2SE_15 = 6; // aka J2SE 5.0 |
| 45 | public static final int J2SE_16 = 7; |
| 46 | |
| 47 | public static final boolean J2ME; |
| 48 | |
| 49 | /** |
| 50 | JDBC Boolean type - Types.BIT in JDK1.1 & 1.2 & 1.3, Types.BOOLEAN in JDK1.4 |
| 51 | */ |
| 52 | public static final int JAVA_SQL_TYPES_BOOLEAN; |
| 53 | |
| 54 | static |
| 55 | { |
| 56 | int id; |
| 57 | |
| 58 | // |
| 59 | // If the property java.specification.version is set, then try to parse |
| 60 | // that. Anything we don't recognize, default to Java 2 platform |
| 61 | // because java.specification.version is a property that is introduced |
| 62 | // in Java 2. We hope that JVM vendors don't implement Java 1 and |
| 63 | // set a Java 2 system property. |
| 64 | // |
| 65 | // Otherwise, see if we recognize what is set in java.version. |
| 66 | // If we don't recoginze that, or if the property is not set, assume |
| 67 | // version 1.3. |
| 68 | // |
| 69 | String javaVersion; |
| 70 | String javaSpec; |
| 71 | boolean isJ2ME; |
| 72 | |
| 73 | try { |
| 74 | javaSpec = System.getProperty("java.specification.name"); |
| 75 | } catch (SecurityException se) { |
| 76 | // some vms do not know about this property so they |
| 77 | // throw a security exception when access is restricted. |
| 78 | javaSpec = null; |
| 79 | } |
| 80 | |
| 81 | try { |
| 82 | javaVersion = System.getProperty("java.specification.version", "1.3"); |
| 83 | |
| 84 | } catch (SecurityException se) { |
| 85 | // some vms do not know about this property so they |
| 86 | // throw a security exception when access is restricted. |
| 87 | javaVersion = "1.3"; |
| 88 | } |
| 89 | |
| 90 | if (javaSpec != null && javaSpec.startsWith("J2ME")) |
| 91 | { |
| 92 | // IBM's WCTME 5.7 returns these values for CDC 1.0 profiles. |
| 93 | // "J2ME Foundation Specification" |
| 94 | // |
| 95 | |
| 96 | // Foundation 1.0 and Personal Profile 1.0 based |
| 97 | // upon CDC 1.0 which is JDK 1.3 based |
| 98 | id = J2SE_13; |
| 99 | isJ2ME = true; |
| 100 | } |
| 101 | else |
| 102 | { |
| 103 | // J2SE/J2EE |
| 104 | isJ2ME = false; |
| 105 | |
| 106 | if (javaVersion.equals("1.2") || javaVersion.equals("1.3")) |
| 107 | { |
| 108 | id = J2SE_13; //jdk1.3 is still Java2 platform with the same API |
| 109 | } |
| 110 | else if (javaVersion.equals("1.4")) |
| 111 | { |
| 112 | String vmVersion = System.getProperty("java.version", "1.4.0"); |
| 113 | |
| 114 | if (JVMInfo.vmCheck(vmVersion, "1.4.0") || JVMInfo.vmCheck(vmVersion, "1.4.1")) |
| 115 | id = J2SE_14; |
| 116 | else |
| 117 | id = J2SE_142; |
| 118 | } |
| 119 | else if (javaVersion.equals("1.5")) |
| 120 | { |
| 121 | id = J2SE_15; |
| 122 | } |
| 123 | else if (javaVersion.equals("1.6")) |
| 124 | { |
| 125 | id = J2SE_16; |
| 126 | } |
| 127 | else |
| 128 | { |
| 129 | // aussme our lowest support unless the java spec |
| 130 | // is greater than our highest level. |
| 131 | id = J2SE_13; |
| 132 | |
| 133 | try { |
| 134 | |
| 135 | if (Float.valueOf(javaVersion).floatValue() > 1.4f) |
| 136 | id = 5; |
| 137 | } catch (NumberFormatException nfe) { |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | JDK_ID = id; |
| 143 | J2ME = isJ2ME; |
| 144 | JAVA_SQL_TYPES_BOOLEAN = (isJ2ME || id >= J2SE_14) ? |
| 145 | org.apache.derby.iapi.reference.JDBC30Translation.SQL_TYPES_BOOLEAN :java.sql.Types.BIT; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | Check the vmVersion against a speciifc value. |
| 150 | Sun jvms are of the form |
| 151 | */ |
| 152 | private static boolean vmCheck(String vmVersion, String id) |
| 153 | { |
| 154 | return vmVersion.equals(id) || vmVersion.startsWith(id + "_"); |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | Return Derby's understanding of the virtual machine's environment. |
| 159 | */ |
| 160 | public static String derbyVMLevel() |
| 161 | { |
| 162 | switch (JDK_ID) |
| 163 | { |
| 164 | case J2SE_13: return J2ME ? "J2ME - JDBC for CDC/FP 1.0" : "J2SE 1.3 - JDBC 2.1"; |
| 165 | case J2SE_14: return "J2SE 1.4 - JDBC 3.0"; |
| 166 | case J2SE_142: return "J2SE 1.4.2 - JDBC 3.0"; |
| 167 | case J2SE_15: return "J2SE 5.0 - JDBC 3.0"; |
| 168 | default: return "?-?"; |
| 169 | } |
| 170 | } |
| 171 | } |