org.jboss.msc.value
Class SystemPropertyValue

java.lang.Object
  org.jboss.msc.value.SystemPropertyValue

All Implemented Interfaces:

PrivilegedAction<String>, Value<String>

public final class SystemPropertyValue
extends Object
implements Value<String>, PrivilegedAction<String>

A value which comes from a system property.

Author:

David M. Lloyd

See Also:

System.getProperty(String)

Constructor Summary

SystemPropertyValue(String propertyName)
Construct a new instance.

SystemPropertyValue(String propertyName, AccessControlContext accessControlContext)
Construct a new instance.

SystemPropertyValue(String propertyName, AccessControlContext accessControlContext, Value<?> defaultValue)
Construct a new instance.

SystemPropertyValue(String propertyName, Value<?> defaultValue)
Construct a new instance.

Method Summary

String	getValue() Get the actual value.
String	run() Fetch the property in an unprivileged context.

Methods inherited from class java.lang.Object

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

Constructor Detail

SystemPropertyValue

public SystemPropertyValue(String propertyName)

Construct a new instance.

Parameters:

propertyName - the property name to read

SystemPropertyValue

public SystemPropertyValue(String propertyName,
                           AccessControlContext accessControlContext)

Construct a new instance.

Parameters:

propertyName - the property name to read

accessControlContext - the access control context in which to fetch the property value

SystemPropertyValue

public SystemPropertyValue(String propertyName,
                           Value<?> defaultValue)

Construct a new instance.

Parameters:

propertyName - the property name to read

defaultValue - the value to use if the property is unset

SystemPropertyValue

public SystemPropertyValue(String propertyName,
                           AccessControlContext accessControlContext,
                           Value<?> defaultValue)

Construct a new instance.

Parameters:

propertyName - the property name to read

accessControlContext - the access control context in which to fetch the property value

defaultValue - the value to use if the property is unset

Method Detail

getValue

public String getValue()
                throws IllegalStateException,
                       IllegalArgumentException

Get the actual value.

Specified by:

getValue in interface Value<String>

Returns:

the actual value

Throws:

IllegalStateException - if the value is time-sensitive and the current state does not allow retrieval.

IllegalArgumentException - when the value cannot be read due to misconfiguration

run

public String run()

Fetch the property in an unprivileged context.

Specified by:

run in interface PrivilegedAction<String>

Returns:

the property value