de.intarsys.pdf.cos
Class COSNull

java.lang.Object
  de.intarsys.pdf.cos.COSDocumentElement
      de.intarsys.pdf.cos.COSObject
          de.intarsys.pdf.cos.COSPrimitiveObject
              de.intarsys.pdf.cos.COSNull

All Implemented Interfaces:

ICOSExceptionHandler, de.intarsys.tools.component.ISaveStateSupport

public class COSNull
extends COSPrimitiveObject

The null object

Field Summary

static COSNull

NULL

Fields inherited from class de.intarsys.pdf.cos.COSObject

CONSTANT_CONTAINER, NULL_CONTAINER, SLOT_CONTAINER

Method Summary

Object	accept(ICOSObjectVisitor visitor) Accept a visitor object.
static COSNull	create()
boolean	equals(Object o)
int	hashCode()
boolean	isNull() answer true if receiver is the null object
Object	saveState()

Methods inherited from class de.intarsys.pdf.cos.COSPrimitiveObject

addObjectListener, basicIterator, copyDeep, copyDeep, isDangling, isObjectListenerAvailable, isPrimitive, iterator, removeObjectListener

Methods inherited from class de.intarsys.pdf.cos.COSObject

asArray, asBoolean, asDictionary, asFixed, asInteger, asName, asNull, asNumber, asStream, asString, beConstant, beIndirect, containable, copyOptional, copyShallow, copySubGraph, dereference, getContainer, getDoc, getIndirectObject, isIndirect, isNumber, isSwapped, restoreState, stringValue, toString

Methods inherited from class de.intarsys.pdf.cos.COSDocumentElement

handleException, isReference

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

NULL

public static final COSNull NULL

Method Detail

create

public static COSNull create()

accept

public Object accept(ICOSObjectVisitor visitor)
              throws COSVisitorException

Description copied from class: COSDocumentElement

Accept a visitor object. The receiver selects the correct implementation in the visitor by "double dispatching".

Specified by:

accept in class COSDocumentElement

Parameters:

visitor - The object visiting the receiver.

Returns:

Object An object depending on the visitor semantics.

Throws:

COSVisitorException - An exception depending on the visitor semantics.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isNull

public boolean isNull()

Description copied from class: COSObject

answer true if receiver is the null object

Overrides:

isNull in class COSObject

Returns:

true if receiver is the null object

saveState

public Object saveState()