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org.apache.avalon.framework.service
Class DefaultServiceSelector

java.lang.Object
  org.apache.avalon.framework.service.DefaultServiceSelector

All Implemented Interfaces:

ServiceSelector

public class DefaultServiceSelector

extends java.lang.Object

implements ServiceSelector

This is the default implementation of the ServiceSelector

Version:

$Id: DefaultServiceSelector.java 30977 2004-07-30 08:57:54Z niclas $

Author:

Avalon Development Team

Constructor Summary

DefaultServiceSelector()
Create a DefaultServiceSelector with a default empty role.

DefaultServiceSelector(java.lang.String role)
Create a DefaultServiceSelector with a role for debug purposes.

Method Summary

protected void	checkWriteable() Checks if this service selector is writeable.
protected java.util.Map	getObjectMap() Helper method for subclasses to retrieve object map.
boolean	isSelectable(java.lang.Object hint) Returns whether a Object exists or not
void	makeReadOnly() Makes this service selector read-only.
void	put(java.lang.Object hint, java.lang.Object object) Populate the ServiceSelector.
void	release(java.lang.Object object) Release object.
java.lang.Object	select(java.lang.Object hint) Select the desired object.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultServiceSelector

public DefaultServiceSelector()

Create a DefaultServiceSelector with a default empty role.

DefaultServiceSelector

public DefaultServiceSelector(java.lang.String role)

Create a DefaultServiceSelector with a role for debug purposes.

Parameters:

role - The role for this selector.

Throws:

java.lang.NullPointerException - if the role is null.

Method Detail

select

public java.lang.Object select(java.lang.Object hint)
                        throws ServiceException

Select the desired object.

Specified by:

select in interface ServiceSelector

Parameters:

hint - the hint to retrieve Object

Returns:

the Object

Throws:

ServiceException - if an error occurs

isSelectable

public boolean isSelectable(java.lang.Object hint)

Returns whether a Object exists or not

Specified by:

isSelectable in interface ServiceSelector

Parameters:

hint - the hint to retrieve Object

Returns:

true if the Object exists

release

public void release(java.lang.Object object)

Release object.

Specified by:

release in interface ServiceSelector

Parameters:

object - the Object to release

put

public void put(java.lang.Object hint,
                java.lang.Object object)

Populate the ServiceSelector.

Parameters:

hint - the hint to be used to retrieve the Object later

object - the Object to hold

getObjectMap

protected final java.util.Map getObjectMap()

Helper method for subclasses to retrieve object map.

Returns:

the object map

makeReadOnly

public void makeReadOnly()

Makes this service selector read-only.

checkWriteable

protected final void checkWriteable()
                             throws java.lang.IllegalStateException

Checks if this service selector is writeable.

Throws:

java.lang.IllegalStateException - if this service selector is read-only