org.forgerock.guice.core.internal.commons.lang

Class SystemUtils

java.lang.Object

org.forgerock.guice.core.internal.commons.lang.SystemUtils

public final class SystemUtils
extends Object

Helpers for java.lang.System.

If a system property cannot be read due to security restrictions, the corresponding field in this class will be set to null and a message will be written to System.err.

Since:

1.0

Version:

$Id: SystemUtils.java 905707 2010-02-02 16:59:59Z niallp $

Field Summary

Fields

Modifier and Type	Field and Description
static String	JAVA_VERSION The java.version System Property.
static float	JAVA_VERSION_FLOAT Gets the Java version as a float.
static String	JAVA_VERSION_TRIMMED Gets the Java version as a String trimming leading letters.

Method Summary

Modifier and Type	Method and Description
static boolean	isJavaVersionAtLeast(float requiredVersion) Is the Java version at least the requested version.

Methods inherited from class java.lang.Object

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

Field Detail

JAVA_VERSION

public static final String JAVA_VERSION

The java.version System Property. Java version number.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:

Java 1.1

JAVA_VERSION_TRIMMED

public static final String JAVA_VERSION_TRIMMED

Gets the Java version as a String trimming leading letters.

The field will return null if JAVA_VERSION is null.

Since:

2.1

JAVA_VERSION_FLOAT

public static final float JAVA_VERSION_FLOAT

Gets the Java version as a float.

Example return values:

• 1.2f for JDK 1.2
• 1.31f for JDK 1.3.1

The field will return zero if JAVA_VERSION is null.

Since:

2.0

Method Detail

isJavaVersionAtLeast

public static boolean isJavaVersionAtLeast(float requiredVersion)

Is the Java version at least the requested version.

Example input:

• 1.2f to test for JDK 1.2
• 1.31f to test for JDK 1.3.1

Parameters:

requiredVersion - the required version, for example 1.31f

Returns:

true if the actual version is equal or greater than the required version