org.apache.avalon.framework.component
Class DefaultComponentSelector

java.lang.Object
  org.apache.avalon.framework.component.DefaultComponentSelector

All Implemented Interfaces:

Component, ComponentSelector

public class DefaultComponentSelector

extends java.lang.Object

implements ComponentSelector

This is the default implementation of the ComponentSelector

Author:

Berin Loritsch

Constructor Summary

DefaultComponentSelector()

Method Summary

protected void	checkWriteable()
protected java.util.Map	getComponentMap() Helper method for subclasses to retrieve component map.
boolean	hasComponent(java.lang.Object hint) Returns whether a Component exists or not
void	makeReadOnly()
void	put(java.lang.Object hint, Component component) Populate the ComponentSelector.
void	release(Component component) Release component.
Component	select(java.lang.Object hint) Select the desired component.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultComponentSelector

public DefaultComponentSelector()

Method Detail

select

public Component select(java.lang.Object hint)
                 throws ComponentException

Select the desired component. It does not cascade, neither should it.

Specified by:

select in interface ComponentSelector

Parameters:

hint - the hint to retrieve Component

Returns:

the Component

Throws:

ComponentException - if an error occurs

hasComponent

public boolean hasComponent(java.lang.Object hint)

Returns whether a Component exists or not

Specified by:

hasComponent in interface ComponentSelector

Returns:

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

release

public void release(Component component)

Release component.

Specified by:

release in interface ComponentSelector

Parameters:

component - the component

put

public void put(java.lang.Object hint,
                Component component)

Populate the ComponentSelector.

getComponentMap

protected final java.util.Map getComponentMap()

Helper method for subclasses to retrieve component map.

Returns:

the component map

makeReadOnly

public void makeReadOnly()

checkWriteable

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

Throws:

java.lang.IllegalStateException