Package org.openjdk.jmc.common.version

Class JavaVMVersionToolkit

java.lang.Object

org.openjdk.jmc.common.version.JavaVMVersionToolkit

public class JavaVMVersionToolkit
extends Object

A toolkit to handle JVM versions.

Constructor Summary

Constructors

Constructor	Description
JavaVMVersionToolkit()

Method Summary

Modifier and Type	Method	Description
static String	decodeJavaVersion(String vmVersion)	Since Sun decided not to have java.specification.version as a performance counter, we need to try to decode the specification version from the VM version.
static boolean	isHotspotJVMName(String vmName)	Returns whether this is a HotSpot JVM or not.
static boolean	isJRockitJVMName(String vmName)	Returns whether this is a JRockit JVM or not.
static boolean	isOpenJDKJVMName(String vmName)	Returns whether this is a OpenJDK JVM or not.
static boolean	isSubstrateVMName(String vmName)	Returns whether this is a Substrate VM or not.
static String	parseJavaVersion(String version)	Parses version string to find java version, such as 1.6.

Methods inherited from class java.lang.Object

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

Constructor Details

JavaVMVersionToolkit

public JavaVMVersionToolkit()

Method Details

decodeJavaVersion

public static String decodeJavaVersion(String vmVersion)

Since Sun decided not to have java.specification.version as a performance counter, we need to try to decode the specification version from the VM version.

Parameters:

vmVersion - the full VM version.

Returns:

the java specification version, or something close to it.

parseJavaVersion

public static String parseJavaVersion(String version)

Parses version string to find java version, such as 1.6.

Parameters:

version - A string that may contain a java version

Returns:

Short java version, or null

isJRockitJVMName

public static boolean isJRockitJVMName(String vmName)

Returns whether this is a JRockit JVM or not.

Parameters:

vmName - the JVM name to check.

Returns:

true if it is a JRockit, false if it isn't or if it was not possible to tell.

isHotspotJVMName

public static boolean isHotspotJVMName(String vmName)

Returns whether this is a HotSpot JVM or not.

Parameters:

vmName - the JVM name to check.

Returns:

true if it is a HotSpot, false if it isn't or if it was not possible to tell.

isSubstrateVMName

public static boolean isSubstrateVMName(String vmName)

Returns whether this is a Substrate VM or not.

Parameters:

vmName - the VM name to check.

Returns:

true if it is a Substrate VM, false if it isn't or if if was not possible to tell.

isOpenJDKJVMName

public static boolean isOpenJDKJVMName(String vmName)

Returns whether this is a OpenJDK JVM or not.

Parameters:

vmName - the JVM name to check.

Returns:

true if it is a OpenJDK JVM, false if it isn't or if it was not possible to tell.