Example usage for org.apache.pdfbox.cos COSName BYTERANGE

Introduction

In this page you can find the example usage for org.apache.pdfbox.cos COSName BYTERANGE.

Prototype

COSName BYTERANGE

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Usage

From source file:com.aaasec.sigserv.csspsupport.pdfbox.modifications.CsCOSWriter.java

License:Apache License

/**
 * visitFromDictionary method comment./*from   w w w.  j  av a2 s  . c o m*/
 *
 * @param obj The object that is being visited.
 *
 * @throws COSVisitorException If there is an exception while visiting this
 * object.
 *
 * @return null
 */
public Object visitFromDictionary(COSDictionary obj) throws COSVisitorException {
    try {
        getStandardOutput().write(DICT_OPEN);
        getStandardOutput().writeEOL();
        for (Map.Entry<COSName, COSBase> entry : obj.entrySet()) {
            COSBase value = entry.getValue();
            if (value != null) {
                entry.getKey().accept(this);
                getStandardOutput().write(SPACE);
                if (value instanceof COSDictionary) {
                    COSDictionary dict = (COSDictionary) value;

                    // write all XObjects as direct objects, this will save some size
                    COSBase item = dict.getItem(COSName.XOBJECT);
                    if (item != null) {
                        item.setDirect(true);
                    }
                    item = dict.getItem(COSName.RESOURCES);
                    if (item != null) {
                        item.setDirect(true);
                    }

                    if (dict.isDirect()) {
                        // If the object should be written direct, we need
                        // to pass the dictionary to the visitor again.
                        visitFromDictionary(dict);
                    } else {
                        addObjectToWrite(dict);
                        writeReference(dict);
                    }
                } else if (value instanceof COSObject) {
                    COSBase subValue = ((COSObject) value).getObject();
                    if (subValue instanceof COSDictionary || subValue == null) {
                        addObjectToWrite(value);
                        writeReference(value);
                    } else {
                        subValue.accept(this);
                    }
                } else {
                    // If we reach the pdf signature, we need to determinate the position of the
                    // content and byterange
                    if (reachedSignature && COSName.CONTENTS.equals(entry.getKey())) {
                        signaturePosition = new int[2];
                        signaturePosition[0] = (int) getStandardOutput().getPos();
                        value.accept(this);
                        signaturePosition[1] = (int) getStandardOutput().getPos();
                    } else if (reachedSignature && COSName.BYTERANGE.equals(entry.getKey())) {
                        byterangePosition = new int[2];
                        byterangePosition[0] = (int) getStandardOutput().getPos() + 1;
                        value.accept(this);
                        byterangePosition[1] = (int) getStandardOutput().getPos() - 1;
                        reachedSignature = false;
                    } else {
                        value.accept(this);
                    }
                }
                getStandardOutput().writeEOL();

            } else {
                //then we won't write anything, there are a couple cases
                //were the value of an entry in the COSDictionary will
                //be a dangling reference that points to nothing
                //so we will just not write out the entry if that is the case
            }
        }
        getStandardOutput().write(DICT_CLOSE);
        getStandardOutput().writeEOL();
        return null;
    } catch (IOException e) {
        throw new COSVisitorException(e);
    }
}

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