net.jini.config

Class EmptyConfiguration

java.lang.Object

net.jini.config.AbstractConfiguration

net.jini.config.EmptyConfiguration

All Implemented Interfaces:

Configuration

public class EmptyConfiguration
extends AbstractConfiguration

A Configuration with no entries. Applications can use an instance of this class to simplify handling cases where no configuration is specified rather than, for example, checking for a null configuration.

Since:

2.0

Author:

Sun Microsystems, Inc.

Implementation Specifics:

This implementation uses the Logger named net.jini.config to log information at the following logging levels:

net.jini.config

Level	Description
FAILED	problems getting entries, including getting entries that are not found
FINE	returning default values

Nested Class Summary

Nested classes/interfaces inherited from class net.jini.config.AbstractConfiguration

AbstractConfiguration.Primitive<T>

Field Summary

Fields

Modifier and Type	Field and Description
static EmptyConfiguration	INSTANCE A Configuration with no entries.

Fields inherited from interface net.jini.config.Configuration

NO_DATA, NO_DEFAULT

Method Summary

Modifier and Type	Method and Description
protected <T> T	getEntryInternal(String component, String name, Class<T> type, Object data) Always throws an exception -- this configuration contains no entries.

Methods inherited from class net.jini.config.AbstractConfiguration

getEntry, getEntry, getEntry, validIdentifier, validQualifiedIdentifier

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final EmptyConfiguration INSTANCE

A Configuration with no entries.

Method Detail

getEntryInternal

protected <T> T getEntryInternal(String component,
                                 String name,
                                 Class<T> type,
                                 Object data)
                          throws NoSuchEntryException

Always throws an exception -- this configuration contains no entries.

Specified by:

getEntryInternal in class AbstractConfiguration

Type Parameters:

T - the type of object requested

Parameters:

component - the component being configured

name - the name of the entry for the component

type - the type of object requested

data - an object to use when computing the value of the entry, or Configuration.NO_DATA to specify no data

Returns:

an object created using the information in the entry matching component and name, and using the value of data (unless it is NO_DATA)

Throws:

NullPointerException - if component, name, or type is null

NoSuchEntryException - unless component, name, or type is null

See Also:

Configuration.getEntry