org.apache.avalon.framework.service
Class DefaultServiceManager

java.lang.Object
  |
  +--org.apache.avalon.framework.service.DefaultServiceManager

All Implemented Interfaces:

ServiceManager

public class DefaultServiceManager

extends Object

implements ServiceManager

This class is a static implementation of a ServiceManager. Allow ineritance and extension so you can generate a tree of ServiceManager each defining Object scope.

Version:

CVS $Revision: 1.18 $ $Date: 2003/02/11 15:58:42 $

Author:

Avalon Development Team

Constructor Summary

DefaultServiceManager()
Construct ServiceManager with no parent.

DefaultServiceManager(ServiceManager parent)
Construct ServiceManager with specified parent.

Method Summary

protected void	checkWriteable() Checks if this ServiceManager is writeable.
protected Map	getObjectMap() Helper method for subclasses to retrieve object map.
protected ServiceManager	getParent() Helper method for subclasses to retrieve parent.
boolean	hasService(String key) Check to see if a Object exists for a key.
Object	lookup(String key) Retrieve Object by key from ServiceManager.
void	makeReadOnly() Makes this ServiceManager read-only.
void	put(String key, Object object) Place Object into ServiceManager.
void	release(Object object) Release the Object.
String	toString() Build a human readable representation of this ServiceManager.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultServiceManager

public DefaultServiceManager()

Construct ServiceManager with no parent.

DefaultServiceManager

public DefaultServiceManager(ServiceManager parent)

Construct ServiceManager with specified parent.

Parameters:

parent - this ServiceManager's parent

Method Detail

lookup

public Object lookup(String key)
              throws ServiceException

Retrieve Object by key from ServiceManager.

Specified by:

lookup in interface ServiceManager

Parameters:

key - the key

Returns:

the Object

Throws:

ServiceException - if an error occurs

hasService

public boolean hasService(String key)

Check to see if a Object exists for a key.

Specified by:

hasService in interface ServiceManager

Parameters:

key - a string identifying the key to check.

Returns:

True if the object exists, False if it does not.

put

public void put(String key,
                Object object)

Place Object into ServiceManager.

Parameters:

key - the object's key

object - an Object value

toString

public String toString()

Build a human readable representation of this ServiceManager.

Overrides:

toString in class Object

Returns:

the description of this ServiceManager

getParent

protected final ServiceManager getParent()

Helper method for subclasses to retrieve parent.

Returns:

the parent ServiceManager

getObjectMap

protected final Map getObjectMap()

Helper method for subclasses to retrieve object map.

Returns:

the object map

makeReadOnly

public void makeReadOnly()

Makes this ServiceManager read-only.

checkWriteable

protected final void checkWriteable()
                             throws IllegalStateException

Checks if this ServiceManager is writeable.

Throws:

IllegalStateException - if this ServiceManager is read-only

release

public void release(Object object)

Release the Object.

Specified by:

release in interface ServiceManager

Parameters:

object - The Object to release.