com.itextpdf.kernel.pdf.layer

Class PdfVisibilityExpression

java.lang.Object

com.itextpdf.kernel.pdf.PdfObjectWrapper<PdfArray>

com.itextpdf.kernel.pdf.layer.PdfVisibilityExpression

public class PdfVisibilityExpression
extends PdfObjectWrapper<PdfArray>

An array specifying a visibility expression, used to compute visibility of content based on a set of optional content groups.

Constructor Summary

Constructors

Constructor and Description
PdfVisibilityExpression(PdfArray visibilityExpressionArray) Constructs a new PdfVisibilityExpression instance by its raw PdfArray.
PdfVisibilityExpression(PdfName operator) Creates a visibility expression.

Method Summary

Modifier and Type	Method and Description
void	addOperand(PdfLayer layer) Adds a new operand to the current visibility expression.
void	addOperand(PdfVisibilityExpression expression) Adds a new opeand to the current visibility expression.
protected boolean	isWrappedObjectMustBeIndirect() Defines if the object behind this wrapper must be an indirect object in the resultant document.

Methods inherited from class com.itextpdf.kernel.pdf.PdfObjectWrapper

ensureObjectIsAddedToDocument, ensureUnderlyingObjectHasIndirectReference, flush, getPdfObject, isFlushed, makeIndirect, makeIndirect, markObjectAsIndirect, setForbidRelease, setModified, setPdfObject, unsetForbidRelease

Methods inherited from class java.lang.Object

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

Constructor Detail

PdfVisibilityExpression

public PdfVisibilityExpression(PdfArray visibilityExpressionArray)

Constructs a new PdfVisibilityExpression instance by its raw PdfArray.

Parameters:

visibilityExpressionArray - the array representing the visibility expression

PdfVisibilityExpression

public PdfVisibilityExpression(PdfName operator)

Creates a visibility expression.

Parameters:

operator - should be either PdfName#And, PdfName#Or, or PdfName#Not

Method Detail

addOperand

public void addOperand(PdfLayer layer)

Adds a new operand to the current visibility expression.

Parameters:

layer - the layer operand to be added.

addOperand

public void addOperand(PdfVisibilityExpression expression)

Adds a new opeand to the current visibility expression.

Parameters:

expression - the PdfVisibilityExpression instance operand to be added

isWrappedObjectMustBeIndirect

protected boolean isWrappedObjectMustBeIndirect()

Description copied from class: PdfObjectWrapper

Defines if the object behind this wrapper must be an indirect object in the resultant document.

If this method returns true it doesn't necessarily mean that object must be in the indirect state at any moment, but rather defines that when the object will be written to the document it will be transformed into indirect object if it's not indirect yet.

Return value of this method shouldn't depend on any logic, it should return always true or false.

Specified by:

isWrappedObjectMustBeIndirect in class PdfObjectWrapper<PdfArray>

Returns:

true if in the resultant document the object behind the wrapper must be indirect, otherwise false.