livespace.osgi
Class SystemPropertyDependency

java.lang.Object
  livespace.osgi.Dependency
      livespace.osgi.SystemPropertyDependency

public class SystemPropertyDependency
extends Dependency

A dependency on a system property. Uses the system property value that was initially read and does not repeatedly check for changes of the property value.

Author:

nguyenv3

Field Summary

protected String	key
protected String	notReadyValue

Fields inherited from class livespace.osgi.Dependency

notReadyListeners, readyListeners

Constructor Summary

SystemPropertyDependency(String key, String notReadyValue)

Method Summary

boolean	isReady() Checks the specified system property.
void	start() Start the dependency looking for its required resources.
void	stop() Stop the dependency looking for its required resources.
Object	value() Convenience method to get the resource acquired by this dependency.

Methods inherited from class livespace.osgi.Dependency

setReady, updateReady

Methods inherited from class java.lang.Object

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

Field Detail

key

protected String key

notReadyValue

protected String notReadyValue

Constructor Detail

SystemPropertyDependency

public SystemPropertyDependency(String key,
                                String notReadyValue)

Method Detail

isReady

public boolean isReady()

Checks the specified system property. If it is the same as the not ready value, then that means the dependency is not ready

Specified by:

isReady in class Dependency

See Also:

Dependency.isReady()

start

public void start()
           throws Exception

Description copied from class: Dependency

Start the dependency looking for its required resources. The ready state will change when it is (which may be immediately as part of this call).

Specified by:

start in class Dependency

Throws:

Exception

stop

public void stop()
          throws Exception

Description copied from class: Dependency

Stop the dependency looking for its required resources. The ready state may change, perhaps immediately as part of this call.

Specified by:

stop in class Dependency

Throws:

Exception

value

public Object value()
             throws UnsupportedOperationException

Description copied from class: Dependency

Convenience method to get the resource acquired by this dependency. Null if dependency is not ready.

Specified by:

value in class Dependency

Throws:

UnsupportedOperationException - if this call is not supported.