Package org.apache.lucene.util

Class Constants

java.lang.Object

org.apache.lucene.util.Constants

public final class Constants
extends Object

Some useful constants.

Field Summary

Fields

Modifier and Type	Field	Description
static final ReadAdvice	DEFAULT_READADVICE	The default ReadAdvice used for opening index files.
static final boolean	FREE_BSD	True iff running on FreeBSD
static final boolean	HAS_FAST_SCALAR_FMA	true iff we know FMA has faster throughput than separate mul/add.
static final boolean	HAS_FAST_VECTOR_FMA	true iff we know VFMA has faster throughput than separate vmul/vadd.
static final boolean	IS_CLIENT_VM	True iff the Java runtime is a client runtime and C2 compiler is not enabled.
static final boolean	IS_HOTSPOT_VM	True iff the Java VM is based on Hotspot and has the Hotspot MX bean readable by Lucene.
static final boolean	IS_JVMCI_VM	True if jvmci is enabled (e.g.
static final String	JAVA_VENDOR	The value of System.getProperty("java.vendor").
static final boolean	JRE_IS_64BIT	True iff running on a 64bit JVM
static final String	JVM_NAME	JVM vendor name.
static final String	JVM_VENDOR	JVM vendor info.
static final boolean	LINUX	True iff running on Linux.
static final boolean	MAC_OS_X	True iff running on Mac OS X
static final String	OS_ARCH	The value of System.getProperty("os.arch").
static final String	OS_NAME	The value of System.getProperty("os.name").
static final String	OS_VERSION	The value of System.getProperty("os.version").
static final boolean	SUN_OS	True iff running on SunOS.
static final boolean	WINDOWS	True iff running on Windows.

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

JVM_VENDOR

public static final String JVM_VENDOR

JVM vendor info.

JVM_NAME

public static final String JVM_NAME

JVM vendor name.

OS_NAME

public static final String OS_NAME

The value of System.getProperty("os.name"). *

LINUX

public static final boolean LINUX

True iff running on Linux.

WINDOWS

public static final boolean WINDOWS

True iff running on Windows.

SUN_OS

public static final boolean SUN_OS

True iff running on SunOS.

MAC_OS_X

public static final boolean MAC_OS_X

True iff running on Mac OS X

FREE_BSD

public static final boolean FREE_BSD

True iff running on FreeBSD

OS_ARCH

public static final String OS_ARCH

The value of System.getProperty("os.arch").

OS_VERSION

public static final String OS_VERSION

The value of System.getProperty("os.version").

JAVA_VENDOR

public static final String JAVA_VENDOR

The value of System.getProperty("java.vendor").

IS_CLIENT_VM

public static final boolean IS_CLIENT_VM

True iff the Java runtime is a client runtime and C2 compiler is not enabled.

IS_HOTSPOT_VM

public static final boolean IS_HOTSPOT_VM

True iff the Java VM is based on Hotspot and has the Hotspot MX bean readable by Lucene.

IS_JVMCI_VM

public static final boolean IS_JVMCI_VM

True if jvmci is enabled (e.g. graalvm)

JRE_IS_64BIT

public static final boolean JRE_IS_64BIT

True iff running on a 64bit JVM

HAS_FAST_VECTOR_FMA

public static final boolean HAS_FAST_VECTOR_FMA

true iff we know VFMA has faster throughput than separate vmul/vadd.

HAS_FAST_SCALAR_FMA

public static final boolean HAS_FAST_SCALAR_FMA

true iff we know FMA has faster throughput than separate mul/add.

DEFAULT_READADVICE

public static final ReadAdvice DEFAULT_READADVICE

The default ReadAdvice used for opening index files. It will be ReadAdvice.RANDOM by default, unless set by system property org.apache.lucene.store.defaultReadAdvice.