com.itextpdf.kernel.pdf.PdfTextArray Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 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:
http://itextpdf.com/terms-of-use/
The interactive user interfaces in modified source and object code versions
of this program must display Appropriate Legal Notices, as required under
Section 5 of the GNU Affero General Public License.
In accordance with Section 7(b) of the GNU Affero General Public License,
a covered work must retain the producer line in every PDF that is created
or manipulated using iText.
You can be released from the requirements of the license by purchasing
a commercial license. Buying such a license is mandatory as soon as you
develop commercial activities involving the iText software without
disclosing the source code of your own applications.
These activities include: offering paid services to customers as an ASP,
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source product.
For more information, please contact iText Software Corp. at this
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*/
package com.itextpdf.kernel.pdf;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import java.util.Collection;
/**
* {@link PdfTextArray} defines an array with displacements and {@link PdfString}-objects.
*
* A {@link PdfTextArray} is used with the operator TJ in {@link PdfCanvas}.
* The first object in this array has to be a {@link PdfString};
* see reference manual version 1.3 section 8.7.5, pages 346-347.
* OR
* see reference manual version 1.6 section 5.3.2, pages 378-379.
* To emit a more efficient array, we consolidate repeated numbers or strings into single array entries.
* For example: "add( 50 ); add( -50 );" will REMOVE the combined zero from the array.
*/
public class PdfTextArray extends PdfArray {
private float lastNumber = Float.NaN;
private StringBuilder lastString;
@Override
public void add(PdfObject pdfObject) {
if (pdfObject.isNumber()) {
add(((PdfNumber)pdfObject).floatValue());
} else if (pdfObject instanceof PdfString) {
add(((PdfString)pdfObject).getValueBytes());
}
}
/**
* Adds content of the {@code PdfArray}.
*
* @param a the {@code PdfArray} to be added
* @see java.util.List#addAll(java.util.Collection)
*/
public void addAll(PdfArray a) {
if (a != null) {
addAll(a.list);
}
}
/**
* Adds the Collection of PdfObjects.
*
* @param c the Collection of PdfObjects to be added
* @see java.util.List#addAll(java.util.Collection)
*/
@Override
public void addAll(Collection c) {
for (PdfObject obj : c) {
add(obj);
}
}
public boolean add(float number) {
// adding zero doesn't modify the TextArray at all
if (number != 0) {
if (!Float.isNaN(lastNumber)) {
lastNumber = number + lastNumber;
if (lastNumber != 0) {
set(size() - 1, new PdfNumber(lastNumber));
} else {
remove(size() - 1);
}
} else {
lastNumber = number;
super.add(new PdfNumber(lastNumber));
}
lastString = null;
return true;
}
return false;
}
public boolean add(String text, PdfFont font) {
// adding an empty string doesn't modify the TextArray at all
return add(font.convertToBytes(text));
}
public boolean add(byte[] text) {
return add(new PdfString(text).getValue());
}
protected boolean add(String text) {
if (text.length() > 0) {
if (lastString != null) {
lastString.append(text);
set(size() - 1, new PdfString(lastString.toString()));
} else {
lastString = new StringBuilder(text);
super.add(new PdfString(lastString.toString()));
}
lastNumber = Float.NaN;
return true;
}
return false;
}
}