org.apache.avalon.framework.service

Class DefaultServiceManager

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`.

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

checkWriteable

protected final void checkWriteable()

Checks if this ServiceManager is writeable.

Throws: IllegalStateException if this ServiceManager is read-only

getObjectMap

protected final Map getObjectMap()

Helper method for subclasses to retrieve object map.

Returns: the object map

getParent

protected final ServiceManager getParent()

Helper method for subclasses to retrieve parent.

Returns: the parent ServiceManager

hasService

public boolean hasService(String key)

Check to see if a Object exists for a key.

Parameters: key a string identifying the key to check.

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

lookup

public Object lookup(String key)

Retrieve Object by key from ServiceManager.

Parameters: key the key

Returns: the Object

Throws: ServiceException if an error occurs

makeReadOnly

public void makeReadOnly()

Makes this ServiceManager read-only.

put

public void put(String key, Object object)

Place Object into ServiceManager.

Parameters: key the object's key object an Object value

release

public void release(Object object)

Release the Object.

Parameters: object The Object to release.

toString

public String toString()

Build a human readable representation of this ServiceManager.

Returns: the description of this ServiceManager