Package org.apache.lucene.util

Class Constants

  • public final class Constants
extends java.lang.Object
    Some useful constants.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static boolean FREE_BSD
      True iff running on FreeBSD
      static java.lang.String JAVA_VENDOR  
      static java.lang.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 java.lang.String JVM_NAME  
      static java.lang.String JVM_VENDOR
      JVM vendor info.
      static java.lang.String JVM_VERSION  
      static boolean LINUX
      True iff running on Linux.
      static java.lang.String LUCENE_MAIN_VERSION
      This is the internal Lucene version, recorded into each segment.
      static java.lang.String LUCENE_VERSION
      This is the Lucene version for display purposes.
      static boolean MAC_OS_X
      True iff running on Mac OS X
      static java.lang.String OS_ARCH  
      static java.lang.String OS_NAME
      The value of System.getProperty("os.name").
      static java.lang.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 java.lang.String JVM_VENDOR
        JVM vendor info.

      • JVM_VERSION

        public static final java.lang.String JVM_VERSION

      • JVM_NAME

        public static final java.lang.String JVM_NAME

      • JAVA_VERSION

        public static final java.lang.String JAVA_VERSION
        The value of System.getProperty("java.version").

      • OS_NAME

        public static final java.lang.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 java.lang.String OS_ARCH

      • OS_VERSION

        public static final java.lang.String OS_VERSION

      • JAVA_VENDOR

        public static final java.lang.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 java.lang.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 java.lang.String LUCENE_VERSION
        This is the Lucene version for display purposes.