edu.umd.cs.jazz.util
Class ZNullList

java.lang.Object
  |
  +--java.util.AbstractCollection
        |
        +--java.util.AbstractList
              |
              +--edu.umd.cs.jazz.util.ZListImpl
                    |
                    +--edu.umd.cs.jazz.util.ZNullList

All Implemented Interfaces:

java.lang.Cloneable, java.util.Collection, java.util.List, java.io.Serializable, ZList, ZList.ZBoundsList, ZList.ZCameraList, ZList.ZLayerGroupList, ZList.ZNodeList, ZList.ZPropertyList, ZList.ZVisualComponentList

public class ZNullList

extends ZListImpl

implements ZList.ZPropertyList, ZList.ZNodeList, ZList.ZVisualComponentList, ZList.ZLayerGroupList, ZList.ZBoundsList, ZList.ZCameraList

This class provides a stand in for ZLists that have no elements. Instead of setting an empty ZList to null we set it to the static instance of ZNullList that is located in ZListImpl. Doing this enables us to avoid == null checks everytime we need to use a ZList.

Author:

Jesse Grosjean

See Also:

Serialized Form

Inner classes inherited from class edu.umd.cs.jazz.util.ZListImpl

ZListImpl.ZBoundsListImpl, ZListImpl.ZCameraListImpl, ZListImpl.ZLayerGroupListImpl, ZListImpl.ZNodeListImpl, ZListImpl.ZObjectListImpl, ZListImpl.ZPropertyListImpl, ZListImpl.ZSceneGraphObjectListImpl, ZListImpl.ZTransformableListImpl, ZListImpl.ZVisualComponentListImpl

Inner classes inherited from class edu.umd.cs.jazz.util.ZList

ZList.ZBoundsList, ZList.ZCameraList, ZList.ZLayerGroupList, ZList.ZNodeList, ZList.ZPropertyList, ZList.ZSceneGraphObjectList, ZList.ZTransformableList, ZList.ZVisualComponentList

Fields inherited from class edu.umd.cs.jazz.util.ZListImpl

NullList, size

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

ZNullList()

Method Summary

void	clear()
ZBounds	collectiveBoundsReference(ZBounds bounds)
boolean	collectiveHasVolatileBounds()
ZSceneGraphObject	collectivePick(java.awt.geom.Rectangle2D rect, ZSceneGraphPath path)
void	collectiveRender(ZRenderContext renderContext, ZBounds visibleBounds)
void	collectiveRepaint(ZBounds bounds)
java.lang.Object[]	createElementData(int capacity)
ZBounds[]	getBoundsReference()
ZCamera[]	getCamerasReference()
java.lang.Object[]	getElementData()
ZLayerGroup[]	getLayersReference()
java.lang.Object	getMatchingProperty(java.lang.Object key)
ZNode[]	getNodesReference()
ZProperty[]	getPropertiesReference()
ZVisualComponent[]	getVisualComponentsReference()
int	indexOfPropertyWithKey(java.lang.Object key)
boolean	isNull()
void	setElementData(java.lang.Object[] data)
int	size()
java.lang.Object[]	toArray()
void	trimToSize()
void	writeObject(ZObjectOutputStream out)

Methods inherited from class edu.umd.cs.jazz.util.ZListImpl

add, add, addAll, addAll, clone, contains, ensureCapacity, get, indexOf, isEmpty, lastIndexOf, moveElementToIndex, pop, pop, remove, removeRange, replaceWith, set, setSize, toArray, writeObject, writeObjectd

Methods inherited from class java.util.AbstractList

equals, hashCode, iterator, listIterator, listIterator, subList

Methods inherited from class java.util.AbstractCollection

containsAll, remove, removeAll, retainAll, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface edu.umd.cs.jazz.util.ZList

clone, moveElementToIndex, pop, pop, replaceWith, setSize, writeObject

Methods inherited from interface java.util.List

add, add, addAll, addAll, contains, containsAll, equals, get, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, retainAll, set, subList, toArray

Constructor Detail

ZNullList

public ZNullList()

Method Detail

clear

public void clear()

Specified by:

clear in interface java.util.List

Overrides:

clear in class ZListImpl

collectiveBoundsReference

public ZBounds collectiveBoundsReference(ZBounds bounds)

Specified by:

collectiveBoundsReference in interface ZList.ZNodeList

collectiveHasVolatileBounds

public boolean collectiveHasVolatileBounds()

Specified by:

collectiveHasVolatileBounds in interface ZList.ZNodeList

collectivePick

public ZSceneGraphObject collectivePick(java.awt.geom.Rectangle2D rect,
                                        ZSceneGraphPath path)

Specified by:

collectivePick in interface ZList.ZNodeList

collectiveRender

public void collectiveRender(ZRenderContext renderContext,
                             ZBounds visibleBounds)

Specified by:

collectiveRender in interface ZList.ZNodeList

collectiveRepaint

public void collectiveRepaint(ZBounds bounds)

Specified by:

collectiveRepaint in interface ZList.ZNodeList

createElementData

public java.lang.Object[] createElementData(int capacity)

Overrides:

createElementData in class ZListImpl

getBoundsReference

public ZBounds[] getBoundsReference()

Specified by:

getBoundsReference in interface ZList.ZBoundsList

getElementData

public java.lang.Object[] getElementData()

Specified by:

getElementData in interface ZList

Overrides:

getElementData in class ZListImpl

getLayersReference

public ZLayerGroup[] getLayersReference()

Specified by:

getLayersReference in interface ZList.ZLayerGroupList

getMatchingProperty

public java.lang.Object getMatchingProperty(java.lang.Object key)

Specified by:

getMatchingProperty in interface ZList.ZPropertyList

getNodesReference

public ZNode[] getNodesReference()

Specified by:

getNodesReference in interface ZList.ZNodeList

getPropertiesReference

public ZProperty[] getPropertiesReference()

Specified by:

getPropertiesReference in interface ZList.ZPropertyList

getVisualComponentsReference

public ZVisualComponent[] getVisualComponentsReference()

Specified by:

getVisualComponentsReference in interface ZList.ZVisualComponentList

indexOfPropertyWithKey

public int indexOfPropertyWithKey(java.lang.Object key)

Specified by:

indexOfPropertyWithKey in interface ZList.ZPropertyList

isNull

public boolean isNull()

Specified by:

isNull in interface ZList

Overrides:

isNull in class ZListImpl

setElementData

public void setElementData(java.lang.Object[] data)

Overrides:

setElementData in class ZListImpl

size

public int size()

Specified by:

size in interface java.util.List

Overrides:

size in class ZListImpl

toArray

public java.lang.Object[] toArray()

Specified by:

toArray in interface java.util.List

Overrides:

toArray in class ZListImpl

trimToSize

public void trimToSize()

Specified by:

trimToSize in interface ZList

Overrides:

trimToSize in class ZListImpl

writeObject

public void writeObject(ZObjectOutputStream out)
                 throws java.io.IOException

getCamerasReference

public ZCamera[] getCamerasReference()

Specified by:

getCamerasReference in interface ZList.ZCameraList