org.oddjob.structural

Class ChildHelper<E>

java.lang.Object

org.oddjob.structural.ChildHelper<E>

All Implemented Interfaces:

java.lang.Iterable<E>, Structural, ChildList<E>

public class ChildHelper<E>
extends java.lang.Object
implements Structural, java.lang.Iterable<E>, ChildList<E>

Helper for managing child Objects. This class will track structural changes and notify listeners.

Author:

Rob Gordon

Constructor Summary

Constructors

Constructor and Description
ChildHelper(Structural source) Constructor.

Method Summary

Modifier and Type	Method and Description
int	addChild(E child) Add a child to the end of the list.
void	addStructuralListener(StructuralListener listener) Add a listener.
boolean	contains(E child) Is this child ours?
E	getChild() Return an only child.
E	getChildAt(int index) Return a child.
java.lang.Object[]	getChildren() Return an array of children.
E[]	getChildren(E[] array) Return an array of children.
static java.lang.Object[]	getChildren(Structural structural)
void	hardResetChildren() Perform a hard reset.
void	insertChild(int index, E child) Insert a child.
void	insertOrRemoveChild(int index, E child) Insert or remove a child depending on if the child is null.
boolean	isNoListeners() Returns true if there are no listeners listening for StructuralEvents.
java.util.Iterator<E>	iterator()
void	removeAllChildren() Allows a sub class to remove all children from itself.
int	removeChild(java.lang.Object child) Remove a child.
E	removeChildAt(int index) Remove a child by index.
void	removeStructuralListener(StructuralListener listener) Remove a listener.
int	size() The number of children.
void	softResetChildren() Perform a soft reset.
void	stopChildren() Stops all the child jobs.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

ChildHelper

public ChildHelper(Structural source)

Constructor.

Parameters:

source - The source used as the source of the event.

Method Detail

insertChild

public void insertChild(int index,
                        E child)

Insert a child.

Specified by:

insertChild in interface ChildList<E>

Parameters:

index - The index.

child - The child.

addChild

public int addChild(E child)

Add a child to the end of the list.

Specified by:

addChild in interface ChildList<E>

Parameters:

child - The child. Must not be null.

Returns:

The index the child was added at.

removeChildAt

public E removeChildAt(int index)
                throws java.lang.IndexOutOfBoundsException

Remove a child by index. This method fires the appropriate event in accordance with the Strucutral interface.

Specified by:

removeChildAt in interface ChildList<E>

Parameters:

index - The index of the child to remove.

Returns:

The child removed.

Throws:

java.lang.IndexOutOfBoundsException - If there is no child at the index.

insertOrRemoveChild

public void insertOrRemoveChild(int index,
                                E child)

Insert or remove a child depending on if the child is null.

Parameters:

index - The index.

child - The child.

removeChild

public int removeChild(java.lang.Object child)
                throws java.lang.IllegalStateException

Remove a child.

Specified by:

removeChild in interface ChildList<E>

Parameters:

child - The child to be removed.

Returns:

The index the child was removed from.

Throws:

java.lang.IllegalStateException - If the child is not our child.

removeAllChildren

public void removeAllChildren()

Allows a sub class to remove all children from itself. This method fires the appropriate events in accordance with the structural interface.

This method isn't synchronized. Simultaneous removal of children by a different thread could result in an IndexOutOfBoundsException.

stopChildren

public void stopChildren()
                  throws FailedToStopException

Stops all the child jobs. Jobs are stopped in reverse order.

Throws:

FailedToStopException

softResetChildren

public void softResetChildren()

Perform a soft reset. This method propagates the soft reset message down to all child jobs. This is a convenience method that a sub class can choose to use.

hardResetChildren

public void hardResetChildren()

Perform a hard reset. This method propergates the hard reset message down to all child jobs. This is a convenience method a sub class can choose to use.

getChildren

public java.lang.Object[] getChildren()

Return an array of children.

Returns:

An array of child objects.

getChildren

public E[] getChildren(E[] array)

Return an array of children.

Returns:

An array of child objects.

getChildAt

public E getChildAt(int index)

Return a child.

Returns:

A child.

getChild

public E getChild()

Return an only child.

Returns:

A child.

contains

public boolean contains(E child)

Is this child ours?

Parameters:

child -

Returns:

true if it is, false if it isn't.

iterator

public java.util.Iterator<E> iterator()

Specified by:

iterator in interface java.lang.Iterable<E>

addStructuralListener

public void addStructuralListener(StructuralListener listener)

Description copied from interface: Structural

Add a listener. The listener will immediately receive add notifications for all existing children.

Specified by:

addStructuralListener in interface Structural

Parameters:

listener - The listener.

removeStructuralListener

public void removeStructuralListener(StructuralListener listener)

Description copied from interface: Structural

Remove a listener.

Specified by:

removeStructuralListener in interface Structural

Parameters:

listener - The listener.

isNoListeners

public boolean isNoListeners()

Returns true if there are no listeners listening for StructuralEvents.

Returns:

true/false.

size

public int size()

The number of children.

Returns:

The number of children.

getChildren

public static java.lang.Object[] getChildren(Structural structural)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object