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 boolean	FREE_BSD	True iff running on FreeBSD
static String	JAVA_VENDOR
static String	JAVA_VERSION	The value of System.getProperty("java.version").
static boolean	JRE_IS_64BIT	True iff running on a 64bit JVM
static boolean	JRE_IS_MINIMUM_JAVA6	Deprecated. With Lucene 4.0, we are always on Java 6
static boolean	JRE_IS_MINIMUM_JAVA7
static boolean	JRE_IS_MINIMUM_JAVA8
static String	JVM_NAME
static String	JVM_VENDOR	JVM vendor info.
static String	JVM_VERSION
static boolean	LINUX	True iff running on Linux.
static String	LUCENE_MAIN_VERSION	This is the internal Lucene version, recorded into each segment.
static String	LUCENE_VERSION	This is the Lucene version for display purposes.
static boolean	MAC_OS_X	True iff running on Mac OS X
static String	OS_ARCH
static String	OS_NAME	The value of System.getProperty("os.name").
static String	OS_VERSION
static boolean	SUN_OS	True iff running on SunOS.
static boolean	WINDOWS	True iff running on Windows.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

JVM_VENDOR

public static final String JVM_VENDOR

JVM vendor info.

JVM_VERSION

public static final String JVM_VERSION

JVM_NAME

public static final String JVM_NAME

JAVA_VERSION

public static final String JAVA_VERSION

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

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

OS_VERSION

public static final String OS_VERSION

JAVA_VENDOR

public static final String JAVA_VENDOR

JRE_IS_MINIMUM_JAVA6

@Deprecated
public static final boolean JRE_IS_MINIMUM_JAVA6

Deprecated.

With Lucene 4.0, we are always on Java 6

JRE_IS_MINIMUM_JAVA7

public static final boolean JRE_IS_MINIMUM_JAVA7

JRE_IS_MINIMUM_JAVA8

public static final boolean JRE_IS_MINIMUM_JAVA8

JRE_IS_64BIT

public static final boolean JRE_IS_64BIT

True iff running on a 64bit JVM

LUCENE_MAIN_VERSION

public static final String LUCENE_MAIN_VERSION

This is the internal Lucene version, recorded into each segment. NOTE: we track per-segment version as a String with the "X.Y" format (no minor version), e.g. "4.0", "3.1", "3.0".

Alpha and Beta versions will have numbers like "X.Y.0.Z", anything else is not allowed. This is done to prevent people from using indexes created with ALPHA/BETA versions with the released version.

LUCENE_VERSION

public static final String LUCENE_VERSION

This is the Lucene version for display purposes.