nextapp.echoservlet.util
Class Version

java.lang.Object
  nextapp.echoservlet.util.Version

public final class Version

extends java.lang.Object

Utility class for comparing version numbers in String format. This class may be used to determine if a version number is greater than another to make a hypothesis about whether the version is compatible with a requirement.

Constructor Summary

private

Version() Non-instantiable class.

Method Summary

private static int	getTokenValue(java.lang.String token) Returns a best guess translation of a string to an integer.
static boolean	meetsRequirement(java.lang.String requiredVersion, java.lang.String testVersion) Tests to see if a version number meets or exceeds a requirement.

Methods inherited from class java.lang.Object

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

Constructor Detail

Version

private Version()

Non-instantiable class.

Method Detail

meetsRequirement

public static final boolean meetsRequirement(java.lang.String requiredVersion,
                                             java.lang.String testVersion)

Tests to see if a version number meets or exceeds a requirement. For example, if version 1.4 is required, 1.4, 1.4.0, 1.4.1, 1.5, and 2.0 would meet the requirement. 0.7, 1, 1.0, 1.3, and 1.3.5 would not. Warning: At this time all versions must be numeric and separated by periods. Any deviation will result in .0 versions, such as 1.5.3b being calculated as 1.5.0.

Parameters:

requiredVersion - The version number that is required.

testVersion - The version number that is available.

Returns:

True if the tested version is equal to or higher than the requirement.

getTokenValue

private static final int getTokenValue(java.lang.String token)

Returns a best guess translation of a string to an integer. If the string is not numeric, zero is returned.

Parameters:

token - A string that may or may not contain a number.

Returns:

The string's value, forcibly converted into a number.