org.apache.shiro.util
Class JavaEnvironment

java.lang.Object
  org.apache.shiro.util.JavaEnvironment

public abstract class JavaEnvironment
extends Object

Internal helper class used to find the Java/JDK version that Shiro is operating within, to allow for automatically adapting to the present platform's capabilities.

Note that Shiro does not support 1.2 or earlier JVMs - only 1.3 and later.

This class was borrowed and heavily based upon a nearly identical version found in the Spring Framework, with minor modifications. The original author names and copyright (Apache 2.0) has been left in place. A special thanks to Rod Johnson, Juergen Hoeller, and Rick Evans for making this available.

Since:

0.2

Field Summary

static int	JAVA_13 Constant identifying the 1.3.x JVM (JDK 1.3).
static int	JAVA_14 Constant identifying the 1.4.x JVM (J2SE 1.4).
static int	JAVA_15 Constant identifying the 1.5 JVM (Java 5).
static int	JAVA_16 Constant identifying the 1.6 JVM (Java 6).
static int	JAVA_17 Constant identifying the 1.7 JVM.

Constructor Summary

JavaEnvironment()

Method Summary

static int	getMajorVersion() Get the major version code.
static String	getVersion() Return the full Java version string, as returned by System.getProperty("java.version").
static boolean	isAtLeastVersion14() Convenience method to determine if the current JVM is at least Java 1.4.
static boolean	isAtLeastVersion15() Convenience method to determine if the current JVM is at least Java 1.5 (Java 5).
static boolean	isAtLeastVersion16() Convenience method to determine if the current JVM is at least Java 1.6 (Java 6).

Methods inherited from class java.lang.Object

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

Field Detail

JAVA_13

public static final int JAVA_13

Constant identifying the 1.3.x JVM (JDK 1.3).

See Also:

Constant Field Values

JAVA_14

public static final int JAVA_14

Constant identifying the 1.4.x JVM (J2SE 1.4).

See Also:

Constant Field Values

JAVA_15

public static final int JAVA_15

Constant identifying the 1.5 JVM (Java 5).

See Also:

Constant Field Values

JAVA_16

public static final int JAVA_16

Constant identifying the 1.6 JVM (Java 6).

See Also:

Constant Field Values

JAVA_17

public static final int JAVA_17

Constant identifying the 1.7 JVM.

See Also:

Constant Field Values

Constructor Detail

JavaEnvironment

public JavaEnvironment()

Method Detail

getVersion

public static String getVersion()

Return the full Java version string, as returned by System.getProperty("java.version").

Returns:

the full Java version string

See Also:

System.getProperty(String)

getMajorVersion

public static int getMajorVersion()

Get the major version code. This means we can do things like if (getMajorVersion() < JAVA_14).

Returns:

a code comparable to the JAVA_XX codes in this class

See Also:

JAVA_13, JAVA_14, JAVA_15, JAVA_16, JAVA_17

isAtLeastVersion14

public static boolean isAtLeastVersion14()

Convenience method to determine if the current JVM is at least Java 1.4.

Returns:

true if the current JVM is at least Java 1.4

See Also:

getMajorVersion(), JAVA_14, JAVA_15, JAVA_16, JAVA_17

isAtLeastVersion15

public static boolean isAtLeastVersion15()

Convenience method to determine if the current JVM is at least Java 1.5 (Java 5).

Returns:

true if the current JVM is at least Java 1.5

See Also:

getMajorVersion(), JAVA_15, JAVA_16, JAVA_17

isAtLeastVersion16

public static boolean isAtLeastVersion16()

Convenience method to determine if the current JVM is at least Java 1.6 (Java 6).

Returns:

true if the current JVM is at least Java 1.6

Since:

1.2

See Also:

getMajorVersion(), JAVA_15, JAVA_16, JAVA_17