| package org.apache.lucene.util; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| import java.lang.reflect.Field; |
| import java.util.Collections; |
| import org.apache.lucene.LucenePackage; |
| |
| /** |
| * Some useful constants. |
| **/ |
| |
| public final class Constants { |
| private Constants() {} // can't construct |
| |
| /** JVM vendor info. */ |
| public static final String JVM_VENDOR = System.getProperty("java.vm.vendor"); |
| public static final String JVM_VERSION = System.getProperty("java.vm.version"); |
| public static final String JVM_NAME = System.getProperty("java.vm.name"); |
| |
| /** The value of <tt>System.getProperty("java.version")</tt>. **/ |
| public static final String JAVA_VERSION = System.getProperty("java.version"); |
| |
| /** The value of <tt>System.getProperty("os.name")</tt>. **/ |
| public static final String OS_NAME = System.getProperty("os.name"); |
| /** True iff running on Linux. */ |
| public static final boolean LINUX = OS_NAME.startsWith("Linux"); |
| /** True iff running on Windows. */ |
| public static final boolean WINDOWS = OS_NAME.startsWith("Windows"); |
| /** True iff running on SunOS. */ |
| public static final boolean SUN_OS = OS_NAME.startsWith("SunOS"); |
| /** True iff running on Mac OS X */ |
| public static final boolean MAC_OS_X = OS_NAME.startsWith("Mac OS X"); |
| |
| public static final String OS_ARCH = System.getProperty("os.arch"); |
| public static final String OS_VERSION = System.getProperty("os.version"); |
| public static final String JAVA_VENDOR = System.getProperty("java.vendor"); |
| |
| /** @deprecated With Lucene 5.0, we are always on Java 7 */ |
| @Deprecated |
| public static final boolean JRE_IS_MINIMUM_JAVA7 = |
| new Boolean(true).booleanValue(); // prevent inlining in foreign class files |
| |
| public static final boolean JRE_IS_MINIMUM_JAVA8; |
| |
| /** True iff running on a 64bit JVM */ |
| public static final boolean JRE_IS_64BIT; |
| |
| static { |
| boolean is64Bit = false; |
| try { |
| final Class<?> unsafeClass = Class.forName("sun.misc.Unsafe"); |
| final Field unsafeField = unsafeClass.getDeclaredField("theUnsafe"); |
| unsafeField.setAccessible(true); |
| final Object unsafe = unsafeField.get(null); |
| final int addressSize = ((Number) unsafeClass.getMethod("addressSize") |
| .invoke(unsafe)).intValue(); |
| //System.out.println("Address size: " + addressSize); |
| is64Bit = addressSize >= 8; |
| } catch (Exception e) { |
| final String x = System.getProperty("sun.arch.data.model"); |
| if (x != null) { |
| is64Bit = x.indexOf("64") != -1; |
| } else { |
| if (OS_ARCH != null && OS_ARCH.indexOf("64") != -1) { |
| is64Bit = true; |
| } else { |
| is64Bit = false; |
| } |
| } |
| } |
| JRE_IS_64BIT = is64Bit; |
| |
| // this method only exists in Java 8: |
| boolean v8 = true; |
| try { |
| Collections.class.getMethod("emptySortedSet"); |
| } catch (NoSuchMethodException nsme) { |
| v8 = false; |
| } |
| JRE_IS_MINIMUM_JAVA8 = v8; |
| } |
| |
| // this method prevents inlining the final version constant in compiled classes, |
| // see: http://www.javaworld.com/community/node/3400 |
| private static String ident(final String s) { |
| return s.toString(); |
| } |
| |
| // NOTE: we track per-segment version as a String with the "X.Y" format, e.g. |
| // "4.0", "3.1", "3.0". Therefore when we change this constant, we should keep |
| // the format. |
| /** |
| * This is the internal Lucene version, recorded into each segment. |
| */ |
| public static final String LUCENE_MAIN_VERSION = ident("5.0"); |
| |
| /** |
| * This is the Lucene version for display purposes. |
| */ |
| public static final String LUCENE_VERSION; |
| static { |
| Package pkg = LucenePackage.get(); |
| String v = (pkg == null) ? null : pkg.getImplementationVersion(); |
| if (v == null) { |
| String parts[] = LUCENE_MAIN_VERSION.split("\\."); |
| if (parts.length == 4) { |
| // alpha/beta |
| assert parts[2].equals("0"); |
| v = parts[0] + "." + parts[1] + "-SNAPSHOT"; |
| } else { |
| v = LUCENE_MAIN_VERSION + "-SNAPSHOT"; |
| } |
| } |
| LUCENE_VERSION = ident(v); |
| } |
| } |