Example usage for org.apache.pdfbox.cos COSString setValue

Introduction

In this page you can find the example usage for org.apache.pdfbox.cos COSString setValue.

Prototype

public void setValue(byte[] value) 

Source Link

Document

Sets the raw value of this string.

Usage

From source file:airviewer.TextInAnnotationReplacer.java

License:Apache License

static void replaceText(PDDocument document, PDAnnotation anAnnotation, String newContents) {

    if (null != anAnnotation.getAppearance() && null != anAnnotation.getAppearance().getNormalAppearance()) {
        try {/*from w  w  w. ja v  a 2  s .c  o  m*/
            PDAppearanceStream annotationAppearanceStream = anAnnotation.getAppearance().getNormalAppearance()
                    .getAppearanceStream();

            PDFStreamParser parser = new PDFStreamParser(annotationAppearanceStream);
            parser.parse();
            List<Object> tokens = parser.getTokens();
            for (int j = 0; j < tokens.size(); j++) {
                Object next = tokens.get(j);
                if (next instanceof Operator) {
                    Operator op = (Operator) next;
                    //Tj and TJ are the two operators that display strings in a PDF
                    if (op.getName().equals("Tj")) {
                        // Tj takes one operand and that is the string to display so lets update that operator
                        COSString previous = (COSString) tokens.get(j - 1);
                        previous.setValue(newContents.getBytes(Charset.forName("UTF-8")));
                    } else if (op.getName().equals("TJ")) {
                        COSArray previous = (COSArray) tokens.get(j - 1);
                        for (int k = 0; k < previous.size(); k++) {
                            Object arrElement = previous.getObject(k);
                            if (arrElement instanceof COSString) {
                                COSString cosString = (COSString) arrElement;
                                cosString.setValue(newContents.getBytes(Charset.forName("UTF-8")));
                            }
                        }
                    }
                }
            }

            try (OutputStream out = annotationAppearanceStream.getStream().createOutputStream()) {
                ContentStreamWriter tokenWriter = new ContentStreamWriter(out);
                tokenWriter.writeTokens(tokens);
            }

            anAnnotation.getAppearance().setNormalAppearance(annotationAppearanceStream);
        } catch (IOException ex) {
            Logger.getLogger(TextInAnnotationReplacer.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

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