com.itextpdf.kernel.pdf.layer.PdfVisibilityExpression Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2019 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
OF THIRD PARTY RIGHTS
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, see http://www.gnu.org/licenses or write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA, 02110-1301 USA, or download the license from the following URL:
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The interactive user interfaces in modified source and object code versions
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Section 5 of the GNU Affero General Public License.
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or manipulated using iText.
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;
}
}