com.itextpdf.kernel.pdf.layer.PdfVisibilityExpression Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2021 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
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or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
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You can be released from the requirements of the license by purchasing
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*/
package com.itextpdf.kernel.pdf.layer;
import com.itextpdf.kernel.pdf.PdfArray;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfObjectWrapper;
/**
* An array specifying a visibility expression, used to compute visibility
* of content based on a set of optional content groups.
*/
public class PdfVisibilityExpression extends PdfObjectWrapper {
private static final long serialVersionUID = 4152369893262322542L;
/**
* Constructs a new PdfVisibilityExpression instance by its raw PdfArray.
* @param visibilityExpressionArray the array representing the visibility expression
*/
public PdfVisibilityExpression(PdfArray visibilityExpressionArray) {
super(visibilityExpressionArray);
PdfName operator = visibilityExpressionArray.getAsName(0);
if (visibilityExpressionArray.size() < 1 || !PdfName.Or.equals(operator)
&& !PdfName.And.equals(operator) && !PdfName.Not.equals(operator)) {
throw new IllegalArgumentException("Invalid visibilityExpressionArray");
}
}
/**
* Creates a visibility expression.
* @param operator should be either PdfName#And, PdfName#Or, or PdfName#Not
*/
public PdfVisibilityExpression(PdfName operator) {
super(new PdfArray());
if (operator == null || !PdfName.Or.equals(operator) && !PdfName.And.equals(operator) && !PdfName.Not.equals(operator))
throw new IllegalArgumentException("Invalid operator");
getPdfObject().add(operator);
}
/**
* Adds a new operand to the current visibility expression.
* @param layer the layer operand to be added.
*/
public void addOperand(PdfLayer layer) {
getPdfObject().add(layer.getPdfObject());
getPdfObject().setModified();
}
/**
* Adds a new opeand to the current visibility expression.
* @param expression the PdfVisibilityExpression instance operand to be added
*/
public void addOperand(PdfVisibilityExpression expression) {
getPdfObject().add(expression.getPdfObject());
getPdfObject().setModified();
}
@Override
protected boolean isWrappedObjectMustBeIndirect() {
return false;
}
}