com.websina.license
Class LicenseManager

java.lang.Object
  com.websina.license.LicenseManager

Direct Known Subclasses:

LicenseManagerImpl

public abstract class LicenseManager

extends java.lang.Object

The class is shipped along with the product to the consumer. It is an abstract class and the getInstance() method returns a LicenseManager implemented by LicenseManagerImpl.

Since:

1.0

Constructor Summary

LicenseManager()

Method Summary

abstract int	daysLeft() It returns how many days are left for the license.
abstract java.lang.String	getFeature(java.lang.String name) This method is called by the license client to get the feature of the license.
static LicenseManager	getInstance()
abstract boolean	isValid() It first checks the license itself is not tampered and is valid, and then checks the license is not expired.

Methods inherited from class java.lang.Object

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

Constructor Detail

LicenseManager

public LicenseManager()

Method Detail

getInstance

public static final LicenseManager getInstance()

isValid

public abstract boolean isValid()
                         throws java.security.GeneralSecurityException

It first checks the license itself is not tampered and is valid, and then checks the license is not expired. User should use getFeature(feature) for additional validation.

Returns:

whether or not the license is valid.

Throws:

java.security.GeneralSecurityException

daysLeft

public abstract int daysLeft()

It returns how many days are left for the license. Here, 0 should be valid, it may indicate the license never expires.

Returns:

how many days are left for the license.

getFeature

public abstract java.lang.String getFeature(java.lang.String name)

This method is called by the license client to get the feature of the license. For example, user may use IP_Address as a feature, and encode a particular IP address inside the license. This IP is then checked against the machine when the user's software is running. In fact, by just checking whether or not a feature exist one case validate the proper use of the license.

Returns:

the feature value of the license.