org.apache.lucene.util.Constants Maven / Gradle / Ivy
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.util.StringTokenizer;
/**
* 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");
public static final String JVM_SPEC_VERSION = System.getProperty("java.specification.version");
/** The value of System.getProperty("java.version"). **/
public static final String JAVA_VERSION = System.getProperty("java.version");
/** The value of System.getProperty("os.name"). **/
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");
/** True iff running on FreeBSD */
public static final boolean FREE_BSD = OS_NAME.startsWith("FreeBSD");
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");
private static final int JVM_MAJOR_VERSION;
private static final int JVM_MINOR_VERSION;
/** True iff running on a 64bit JVM */
public static final boolean JRE_IS_64BIT;
static {
final StringTokenizer st = new StringTokenizer(JVM_SPEC_VERSION, ".");
JVM_MAJOR_VERSION = Integer.parseInt(st.nextToken());
if (st.hasMoreTokens()) {
JVM_MINOR_VERSION = Integer.parseInt(st.nextToken());
} else {
JVM_MINOR_VERSION = 0;
}
boolean is64Bit = false;
final String x = System.getProperty("sun.arch.data.model");
if (x != null) {
is64Bit = x.contains("64");
} else {
if (OS_ARCH != null && OS_ARCH.contains("64")) {
is64Bit = true;
} else {
is64Bit = false;
}
}
JRE_IS_64BIT = is64Bit;
}
public static final boolean JRE_IS_MINIMUM_JAVA8 = JVM_MAJOR_VERSION > 1 || (JVM_MAJOR_VERSION == 1 && JVM_MINOR_VERSION >= 8);
public static final boolean JRE_IS_MINIMUM_JAVA9 = JVM_MAJOR_VERSION > 1 || (JVM_MAJOR_VERSION == 1 && JVM_MINOR_VERSION >= 9);
/**
* This is the internal Lucene version, including bugfix versions, recorded into each segment.
* @deprecated Use {@link Version#LATEST}
*/
@Deprecated
public static final String LUCENE_MAIN_VERSION = Version.LATEST.toString();
/**
* Don't use this constant because the name is not self-describing!
* @deprecated Use {@link Version#LATEST}
*/
@Deprecated
public static final String LUCENE_VERSION = Version.LATEST.toString();
}