Example usage for org.apache.pdfbox.cos COSBase accept

Introduction

In this page you can find the example usage for org.apache.pdfbox.cos COSBase accept.

Prototype

public abstract Object accept(ICOSVisitor visitor) throws IOException;

Source Link

Document

visitor pattern double dispatch method.

Usage

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

License:Apache License

/**
 * This will write a COS object./*from   ww w. j  a  v a 2  s. co m*/
 *
 * @param obj The object to write.
 *
 * @throws COSVisitorException If there is an error visiting objects.
 */
public void doWriteObject(COSBase obj) throws COSVisitorException {
    try {
        writtenObjects.add(obj);
        if (obj instanceof COSDictionary) {
            COSDictionary dict = (COSDictionary) obj;
            COSName item = (COSName) dict.getItem(COSName.TYPE);
            if (COSName.SIG.equals(item) || COSName.DOC_TIME_STAMP.equals(item)) {
                reachedSignature = true;
            }
        }

        // find the physical reference
        currentObjectKey = getObjectKey(obj);
        // add a x ref entry
        addXRefEntry(new COSWriterXRefEntry(getStandardOutput().getPos(), obj, currentObjectKey));
        // write the object
        getStandardOutput().write(String.valueOf(currentObjectKey.getNumber()).getBytes("ISO-8859-1"));
        getStandardOutput().write(SPACE);
        getStandardOutput().write(String.valueOf(currentObjectKey.getGeneration()).getBytes("ISO-8859-1"));
        getStandardOutput().write(SPACE);
        getStandardOutput().write(OBJ);
        getStandardOutput().writeEOL();
        obj.accept(this);
        getStandardOutput().writeEOL();
        getStandardOutput().write(ENDOBJ);
        getStandardOutput().writeEOL();
    } catch (IOException e) {
        throw new COSVisitorException(e);
    }
}

---

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

License:Apache License

/**
 * visitFromArray method comment./*w w  w .ja va2s  .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 visitFromArray(COSArray obj) throws COSVisitorException {
    try {
        int count = 0;
        getStandardOutput().write(ARRAY_OPEN);
        for (Iterator<COSBase> i = obj.iterator(); i.hasNext();) {
            COSBase current = i.next();
            if (current instanceof COSDictionary) {
                addObjectToWrite(current);
                writeReference(current);
            } else if (current instanceof COSObject) {
                COSBase subValue = ((COSObject) current).getObject();
                if (subValue instanceof COSDictionary || subValue == null) {
                    addObjectToWrite(current);
                    writeReference(current);
                } else {
                    subValue.accept(this);
                }
            } else if (current == null) {
                COSNull.NULL.accept(this);
            } else if (current instanceof COSString) {
                COSString copy = new COSString(((COSString) current).getString());
                copy.accept(this);
            } else {
                current.accept(this);
            }
            count++;
            if (i.hasNext()) {
                if (count % 10 == 0) {
                    getStandardOutput().writeEOL();
                } else {
                    getStandardOutput().write(SPACE);
                }
            }
        }
        getStandardOutput().write(ARRAY_CLOSE);
        getStandardOutput().writeEOL();
        return null;
    } catch (IOException e) {
        throw new COSVisitorException(e);
    }
}

---

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

License:Apache License

/**
 * visitFromDictionary method comment./*  ww w  .ja va2 s .co 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);
    }
}

---