class PdfPages {

    private final ArrayList<PdfIndirectReference> pages = new ArrayList<>();
    private final ArrayList<PdfIndirectReference> parents = new ArrayList<>();
    private final PdfWriter writer;
    private int leafSize = 10;
    private PdfIndirectReference topParent;

    // constructors

    /**
     * Constructs a <CODE>PdfPages</CODE>-object.
     */

    PdfPages(PdfWriter writer) {
        this.writer = writer;
    }

    void addPage(PdfDictionary page) {
        try {
            if ((pages.size() % leafSize) == 0) {
                parents.add(writer.getPdfIndirectReference());
            }
            PdfIndirectReference parent = parents.get(parents.size() - 1);
            page.put(PdfName.PARENT, parent);
            PdfIndirectReference current = writer.getCurrentPage();
            writer.addToBody(page, current);
            pages.add(current);
        } catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }

    PdfIndirectReference addPageRef(PdfIndirectReference pageRef) {
        try {
            if ((pages.size() % leafSize) == 0) {
                parents.add(writer.getPdfIndirectReference());
            }
            pages.add(pageRef);
            return parents.get(parents.size() - 1);
        } catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }

    // returns the top parent to include in the catalog
    PdfIndirectReference writePageTree() throws IOException {
        if (pages.isEmpty()) {
            throw new IOException(MessageLocalization.getComposedMessage("the.document.has.no.pages"));
        }
        int leaf = 1;
        ArrayList<PdfIndirectReference> tParents = parents;
        ArrayList<PdfIndirectReference> tPages = pages;
        ArrayList<PdfIndirectReference> nextParents = new ArrayList<>();
        while (true) {
            leaf *= leafSize;
            int stdCount = leafSize;
            int rightCount = tPages.size() % leafSize;
            if (rightCount == 0) {
                rightCount = leafSize;
            }
            for (int p = 0; p < tParents.size(); ++p) {
                int count;
                int thisLeaf = leaf;
                if (p == tParents.size() - 1) {
                    count = rightCount;
                    thisLeaf = pages.size() % leaf;
                    if (thisLeaf == 0) {
                        thisLeaf = leaf;
                    }
                } else {
                    count = stdCount;
                }
                PdfDictionary top = new PdfDictionary(PdfName.PAGES);
                top.put(PdfName.COUNT, new PdfNumber(thisLeaf));
                PdfArray kids = new PdfArray(tPages.subList(p * stdCount, p * stdCount + count));
                top.put(PdfName.KIDS, kids);
                if (tParents.size() > 1) {
                    if ((p % leafSize) == 0) {
                        nextParents.add(writer.getPdfIndirectReference());
                    }
                    top.put(PdfName.PARENT, nextParents.get(p / leafSize));
                }
                writer.addToBody(top, tParents.get(p));
            }
            if (tParents.size() == 1) {
                topParent = tParents.get(0);
                return topParent;
            }
            tPages = tParents;
            tParents = nextParents;
            nextParents = new ArrayList<>();
        }
    }

    void setLinearMode(PdfIndirectReference topParent) {
        if (parents.size() > 1) {
            throw new RuntimeException(
                    MessageLocalization.getComposedMessage("linear.page.mode.can.only.be.called.with.a.single.parent"));
        }
        if (topParent != null) {
            this.topParent = topParent;
            parents.clear();
            parents.add(topParent);
        }
        leafSize = 10000000;
    }

    int reorderPages(int[] order) throws DocumentException {<FILL_FUNCTION_BODY>}
}

        if (order == null) {
            return pages.size();
        }
        if (parents.size() > 1) {
            throw new DocumentException(MessageLocalization.getComposedMessage(
                    "page.reordering.requires.a.single.parent.in.the.page.tree.call.pdfwriter.setlinearmode.after.open"));
        }
        if (order.length != pages.size()) {
            throw new DocumentException(MessageLocalization.getComposedMessage(
                    "page.reordering.requires.an.array.with.the.same.size.as.the.number.of.pages"));
        }
        int max = pages.size();
        boolean[] temp = new boolean[max];
        for (int k = 0; k < max; ++k) {
            int p = order[k];
            if (p < 1 || p > max) {
                throw new DocumentException(
                        MessageLocalization.getComposedMessage("page.reordering.requires.pages.between.1.and.1.found.2",
                                String.valueOf(max), String.valueOf(p)));
            }
            if (temp[p - 1]) {
                throw new DocumentException(MessageLocalization.getComposedMessage(
                        "page.reordering.requires.no.page.repetition.page.1.is.repeated", p));
            }
            temp[p - 1] = true;
        }
        PdfIndirectReference[] copy = pages.toArray(new PdfIndirectReference[0]);
        for (int k = 0; k < max; ++k) {
            pages.set(k, copy[order[k] - 1]);
        }
        return max;
    
<no_super_class>