org.apache.shiro.util
Class JavaEnvironment

java.lang.Object
  extended by 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


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