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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 .
*/
package com.itextpdf.kernel.pdf;
import com.itextpdf.commons.utils.MessageFormatUtil;
import com.itextpdf.io.logs.IoLogMessageConstant;
import com.itextpdf.kernel.exceptions.KernelExceptionMessageConstant;
import com.itextpdf.kernel.exceptions.PdfException;
import com.itextpdf.kernel.logs.KernelLogMessageConstant;
import com.itextpdf.kernel.pdf.PdfReader.StrictnessLevel;
import com.itextpdf.kernel.pdf.action.PdfAction;
import com.itextpdf.kernel.pdf.collection.PdfCollection;
import com.itextpdf.kernel.pdf.layer.PdfOCProperties;
import com.itextpdf.kernel.pdf.navigation.PdfDestination;
import com.itextpdf.kernel.pdf.navigation.PdfExplicitDestination;
import com.itextpdf.kernel.pdf.navigation.PdfStringDestination;
import com.itextpdf.kernel.utils.NullCopyFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The root of a document’s object hierarchy.
*/
public class PdfCatalog extends PdfObjectWrapper {
private static final Logger LOGGER = LoggerFactory.getLogger(PdfCatalog.class);
private static final String ROOT_OUTLINE_TITLE = "Outlines";
private static final Set PAGE_MODES = Collections.unmodifiableSet(new HashSet<>(
Arrays.asList(PdfName.UseNone, PdfName.UseOutlines, PdfName.UseThumbs,
PdfName.FullScreen, PdfName.UseOC, PdfName.UseAttachments)));
private static final Set PAGE_LAYOUTS = Collections.unmodifiableSet(new HashSet<>(
Arrays.asList(PdfName.SinglePage, PdfName.OneColumn, PdfName.TwoColumnLeft,
PdfName.TwoColumnRight, PdfName.TwoPageLeft, PdfName.TwoPageRight)));
final private PdfPagesTree pageTree;
/**
* Map of the {@link PdfNameTree}. Used for creation {@code name tree} dictionary.
*/
protected Map nameTrees = new LinkedHashMap<>();
/**
* Defining the page labelling for the document.
*/
protected PdfNumTree pageLabels;
/**
* The document’s optional content properties dictionary.
*/
protected PdfOCProperties ocProperties;
private PdfOutline outlines;
//This HashMap contents all pages of the document and outlines associated to them
private final Map> pagesWithOutlines = new HashMap<>();
//This flag determines if Outline tree of the document has been built via calling getOutlines method.
// If this flag is false all outline operations will be ignored
private boolean outlineMode;
/**
* Create {@link PdfCatalog} dictionary.
*
* @param pdfObject the dictionary to be wrapped
*/
protected PdfCatalog(PdfDictionary pdfObject) {
super(pdfObject);
if (pdfObject == null) {
throw new PdfException(KernelExceptionMessageConstant.DOCUMENT_HAS_NO_PDF_CATALOG_OBJECT);
}
ensureObjectIsAddedToDocument(pdfObject);
getPdfObject().put(PdfName.Type, PdfName.Catalog);
setForbidRelease();
pageTree = new PdfPagesTree(this);
}
/**
* Create {@link PdfCatalog} to {@link PdfDocument}.
*
* @param pdfDocument A {@link PdfDocument} object representing the document
* to which redaction applies
*/
protected PdfCatalog(PdfDocument pdfDocument) {
this((PdfDictionary) new PdfDictionary().makeIndirect(pdfDocument));
}
/**
* Use this method to get the Optional Content Properties Dictionary.
* Note that if you call this method, then the {@link PdfDictionary} with OCProperties will be
* generated from {@link PdfOCProperties} object right before closing the {@link PdfDocument},
* so if you want to make low-level changes in Pdf structures themselves ({@link PdfArray},
* {@link PdfDictionary}, etc), then you should address directly those objects, e.g.:
*
* PdfCatalog pdfCatalog = pdfDoc.getCatalog();
* PdfDictionary ocProps = pdfCatalog.getAsDictionary(PdfName.OCProperties);
* // manipulate with ocProps.
*
* Also note that this method is implicitly called when creating a new PdfLayer instance,
* so you should either use hi-level logic of operating with layers,
* or manipulate low-level Pdf objects by yourself.
*
* @param createIfNotExists true to create new /OCProperties entry in catalog if not exists,
* false to return null if /OCProperties entry in catalog is not present.
*
* @return the Optional Content Properties Dictionary
*/
public PdfOCProperties getOCProperties(boolean createIfNotExists) {
if (ocProperties != null)
return ocProperties;
else {
PdfDictionary ocPropertiesDict = getPdfObject().getAsDictionary(PdfName.OCProperties);
if (ocPropertiesDict != null) {
if (getDocument().getWriter() != null) {
ocPropertiesDict.makeIndirect(getDocument());
}
ocProperties = new PdfOCProperties(ocPropertiesDict);
} else if (createIfNotExists) {
ocProperties = new PdfOCProperties(getDocument());
}
}
return ocProperties;
}
/**
* Get {@link PdfDocument} with indirect reference associated with the object.
*
* @return the resultant dictionary
*/
public PdfDocument getDocument() {
return getPdfObject().getIndirectReference().getDocument();
}
/**
* PdfCatalog will be flushed in PdfDocument.close(). User mustn't flush PdfCatalog!
*/
@Override
public void flush() {
Logger logger = LoggerFactory.getLogger(PdfDocument.class);
logger.warn("PdfCatalog cannot be flushed manually");
}
@Override
protected boolean isWrappedObjectMustBeIndirect() {
return true;
}
/**
* A value specifying a destination that shall be displayed when the document is opened.
* See ISO 32000-1, Table 28 – Entries in the catalog dictionary.
*
* @param destination instance of {@link PdfDestination}.
*
* @return destination
*/
public PdfCatalog setOpenAction(PdfDestination destination) {
return put(PdfName.OpenAction, destination.getPdfObject());
}
/**
* A value specifying an action that shall be performed when the document is opened.
* See ISO 32000-1, Table 28 – Entries in the catalog dictionary.
*
* @param action instance of {@link PdfAction}.
*
* @return action
*/
public PdfCatalog setOpenAction(PdfAction action) {
return put(PdfName.OpenAction, action.getPdfObject());
}
/**
* The actions that shall be taken in response to various trigger events affecting the document as a whole.
* See ISO 32000-1, Table 28 – Entries in the catalog dictionary.
*
* @param key the key of which the associated value needs to be returned
* @param action instance of {@link PdfAction}.
*
* @return additional action
*/
public PdfCatalog setAdditionalAction(PdfName key, PdfAction action) {
PdfAction.setAdditionalAction(this, key, action);
return this;
}
/**
* Get page mode of the document.
*
* @return current instance of {@link PdfCatalog}
*/
public PdfName getPageMode() {
return getPdfObject().getAsName(PdfName.PageMode);
}
/**
* This method sets a page mode of the document.
*
* Valid values are: {@code PdfName.UseNone}, {@code PdfName.UseOutlines}, {@code PdfName.UseThumbs},
* {@code PdfName.FullScreen}, {@code PdfName.UseOC}, {@code PdfName.UseAttachments}.
*
* @param pageMode page mode.
*
* @return current instance of PdfCatalog
*/
public PdfCatalog setPageMode(PdfName pageMode) {
if (PAGE_MODES.contains(pageMode)) {
return put(PdfName.PageMode, pageMode);
}
return this;
}
/**
* Get page layout of the document.
*
* @return name object of page layout that shall be used when document is opened
*/
public PdfName getPageLayout() {
return getPdfObject().getAsName(PdfName.PageLayout);
}
/**
* This method sets a page layout of the document
*
* @param pageLayout page layout of the document
*
* @return {@link PdfCatalog} instance with applied page layout
*/
public PdfCatalog setPageLayout(PdfName pageLayout) {
if (PAGE_LAYOUTS.contains(pageLayout)) {
return put(PdfName.PageLayout, pageLayout);
}
return this;
}
/**
* Get viewer preferences of the document.
*
* @return dictionary of viewer preferences
*/
public PdfViewerPreferences getViewerPreferences() {
PdfDictionary viewerPreferences = getPdfObject().getAsDictionary(PdfName.ViewerPreferences);
if (viewerPreferences != null) {
return new PdfViewerPreferences(viewerPreferences);
} else {
return null;
}
}
/**
* This method sets the document viewer preferences, specifying the way the document shall be displayed on the
* screen
*
* @param preferences document's {@link PdfViewerPreferences viewer preferences}
*
* @return {@link PdfCatalog} instance with applied viewer preferences
*/
public PdfCatalog setViewerPreferences(PdfViewerPreferences preferences) {
return put(PdfName.ViewerPreferences, preferences.getPdfObject());
}
/**
* This method gets Names tree from the catalog.
*
* @param treeType type of the tree (Dests, AP, EmbeddedFiles etc).
*
* @return returns {@link PdfNameTree}
*/
public PdfNameTree getNameTree(PdfName treeType) {
PdfNameTree tree = nameTrees.get(treeType);
if (tree == null) {
tree = new PdfNameTree(this, treeType);
nameTrees.put(treeType, tree);
}
return tree;
}
/**
* This method returns the NumberTree of Page Labels
*
* @param createIfNotExists defines whether the NumberTree of Page Labels should be created
* if it didn't exist before
*
* @return returns {@link PdfNumTree}
*/
public PdfNumTree getPageLabelsTree(boolean createIfNotExists) {
if (pageLabels == null && (getPdfObject().containsKey(PdfName.PageLabels) || createIfNotExists)) {
pageLabels = new PdfNumTree(this, PdfName.PageLabels);
}
return pageLabels;
}
/**
* Get natural language.
*
* @return natural language
*/
public PdfString getLang() {
return getPdfObject().getAsString(PdfName.Lang);
}
/**
* An entry specifying the natural language, and optionally locale. Use this
* to specify the Language attribute on a Tagged Pdf element.
* For the content usage dictionary, use PdfName.Language
*
* @param lang {@link PdfString language} to be set
*/
public void setLang(PdfString lang) {
put(PdfName.Lang, lang);
}
/**
* Add an extensions dictionary containing developer prefix identification and version
* numbers for developer extensions that occur in this document.
* See ISO 32000-1, Table 28 – Entries in the catalog dictionary.
*
* @param extension enables developers to identify their own extension
* relative to a base version of PDF
*/
public void addDeveloperExtension(PdfDeveloperExtension extension) {
PdfDictionary extensions = getPdfObject().getAsDictionary(PdfName.Extensions);
if (extensions == null) {
extensions = new PdfDictionary();
put(PdfName.Extensions, extensions);
}
if (extension.isMultiValued()) {
// for multivalued extensions, we only check whether one of the same level is present or not
// (main use case: ISO extensions)
PdfArray existingExtensionArray = extensions.getAsArray(extension.getPrefix());
if (existingExtensionArray == null) {
existingExtensionArray = new PdfArray();
extensions.put(extension.getPrefix(), existingExtensionArray);
} else {
for (int i = 0; i < existingExtensionArray.size(); i++) {
PdfDictionary pdfDict = existingExtensionArray.getAsDictionary(i);
// for array-based extensions, we check for membership only, since comparison doesn't make sense
if (pdfDict.getAsNumber(PdfName.ExtensionLevel).intValue() == extension.getExtensionLevel()) {
return;
}
}
}
existingExtensionArray.add(extension.getDeveloperExtensions());
existingExtensionArray.setModified();
} else {
// for single-valued extensions, we compare against the existing extension level
PdfDictionary existingExtensionDict = extensions.getAsDictionary(extension.getPrefix());
if (existingExtensionDict != null) {
int diff = extension.getBaseVersion().compareTo(existingExtensionDict.getAsName(PdfName.BaseVersion));
if (diff < 0)
return;
diff = extension.getExtensionLevel() - existingExtensionDict.
getAsNumber(PdfName.ExtensionLevel).intValue();
if (diff <= 0)
return;
}
extensions.put(extension.getPrefix(), extension.getDeveloperExtensions());
}
}
/**
* Gets collection dictionary that a conforming reader shall use to enhance the presentation of file attachments
* stored in the PDF document.
*
* @return {@link PdfCollection} wrapper of collection dictionary.
*/
public PdfCollection getCollection() {
PdfDictionary collectionDictionary = getPdfObject().getAsDictionary(PdfName.Collection);
if (collectionDictionary != null) {
return new PdfCollection(collectionDictionary);
}
return null;
}
/**
* Sets collection dictionary that a conforming reader shall use to enhance the presentation of file attachments
* stored in the PDF document.
*
* @param collection {@link PdfCollection dictionary}
*
* @return {@link PdfCatalog} instance with applied collection dictionary
*/
public PdfCatalog setCollection(PdfCollection collection) {
put(PdfName.Collection, collection.getPdfObject());
return this;
}
/**
* Add key and value to {@link PdfCatalog} dictionary.
*
* @param key the dictionary key corresponding with the PDF object
* @param value the value of key
*
* @return the key and value
*/
public PdfCatalog put(PdfName key, PdfObject value) {
getPdfObject().put(key, value);
setModified();
return this;
}
/**
* Remove key from catalog dictionary.
*
* @param key the dictionary key corresponding with the PDF object
*
* @return the key
*/
public PdfCatalog remove(PdfName key) {
getPdfObject().remove(key);
setModified();
return this;
}
/**
* True indicates that getOCProperties() was called, may have been modified,
* and thus its dictionary needs to be reconstructed.
*
* @return boolean indicating if the dictionary needs to be reconstructed
*/
protected boolean isOCPropertiesMayHaveChanged() {
return ocProperties != null;
}
PdfPagesTree getPageTree() {
return pageTree;
}
/**
* this method return map containing all pages of the document with associated outlines.
*
* @return map containing all pages of the document with associated outlines
*/
Map> getPagesWithOutlines() {
return pagesWithOutlines;
}
/**
* This methods adds new name to the Dests NameTree. It throws an exception, if the name already exists.
*
* @param key Name of the destination.
* @param value An object destination refers to. Must be an array or a dictionary with key /D and array.
* See ISO 32000-1 12.3.2.3 for more info.
*/
void addNamedDestination(PdfString key, PdfObject value) {
addNameToNameTree(key, value, PdfName.Dests);
}
/**
* This methods adds a new name to the specified NameTree. It throws an exception, if the name already exists.
*
* @param key key in the name tree
* @param value value in the name tree
* @param treeType type of the tree (Dests, AP, EmbeddedFiles etc).
*/
void addNameToNameTree(PdfString key, PdfObject value, PdfName treeType) {
getNameTree(treeType).addEntry(key, value);
}
/**
* This method returns a complete outline tree of the whole document.
*
* @param updateOutlines if the flag is true, the method read the whole document and creates outline tree.
* If false the method gets cached outline tree (if it was cached via calling
* getOutlines method before).
*
* @return fully initialized {@link PdfOutline} object.
*/
PdfOutline getOutlines(boolean updateOutlines) {
if (outlines != null && !updateOutlines)
return outlines;
if (outlines != null) {
outlines.clear();
pagesWithOutlines.clear();
}
outlineMode = true;
PdfNameTree destsTree = getNameTree(PdfName.Dests);
PdfDictionary outlineRoot = getPdfObject().getAsDictionary(PdfName.Outlines);
if (outlineRoot == null) {
if (null == getDocument().getWriter()) {
return null;
}
outlines = new PdfOutline(getDocument());
} else {
constructOutlines(outlineRoot, destsTree);
}
return outlines;
}
/**
* Indicates if the catalog has any outlines
*
* @return {@code true}, if there are outlines and {@code false} otherwise.
*/
boolean hasOutlines() {
return getPdfObject().containsKey(PdfName.Outlines);
}
/**
* This flag determines if Outline tree of the document has been built via calling getOutlines method.
* If this flag is false all outline operations will be ignored
*
* @return state of outline mode.
*/
boolean isOutlineMode() {
return outlineMode;
}
/**
* This method removes all outlines associated with a given page
*
* @param page the page to remove outlines
*/
void removeOutlines(PdfPage page) {
if (getDocument().getWriter() == null) {
return;
}
if (hasOutlines()) {
getOutlines(false);
if (pagesWithOutlines.size() > 0) {
if (pagesWithOutlines.get(page.getPdfObject()) != null) {
for (PdfOutline outline : pagesWithOutlines.get(page.getPdfObject())) {
outline.removeOutline();
}
}
}
}
}
/**
* This method sets the root outline element in the catalog.
*
* @param outline the outline dictionary that shall be the root of the document’s outline hierarchy
*/
void addRootOutline(PdfOutline outline) {
if (!outlineMode)
return;
if (pagesWithOutlines.size() == 0) {
put(PdfName.Outlines, outline.getContent());
}
}
/**
* Construct {@link PdfCatalog dictionary} iteratively. Invalid pdf documents will be processed depending on {@link
* StrictnessLevel}, if it set to lenient, we will ignore and process invalid outline structure, otherwise {@link
* PdfException} will be thrown.
*
* @param outlineRoot {@link PdfOutline dictionary} root.
* @param names map containing the PdfObjects stored in the tree.
*/
void constructOutlines(PdfDictionary outlineRoot, IPdfNameTreeAccess names) {
if (outlineRoot == null) {
return;
}
PdfReader reader = getDocument().getReader();
final boolean isLenientLevel =
reader == null || StrictnessLevel.CONSERVATIVE.isStricter(reader.getStrictnessLevel());
PdfDictionary current = outlineRoot.getAsDictionary(PdfName.First);
outlines = new PdfOutline(ROOT_OUTLINE_TITLE, outlineRoot, getDocument());
PdfOutline parentOutline = outlines;
Map nextUnprocessedChildForParentMap = new HashMap<>();
Set alreadyVisitedOutlinesSet = new HashSet<>();
while (current != null) {
PdfDictionary parent = current.getAsDictionary(PdfName.Parent);
if (null == parent && !isLenientLevel) {
throw new PdfException(
MessageFormatUtil.format(
KernelExceptionMessageConstant.CORRUPTED_OUTLINE_NO_PARENT_ENTRY,
current.indirectReference));
}
PdfString title = current.getAsString(PdfName.Title);
if (null == title) {
throw new PdfException(
MessageFormatUtil.format(
KernelExceptionMessageConstant.CORRUPTED_OUTLINE_NO_TITLE_ENTRY,
current.indirectReference));
}
PdfOutline currentOutline = new PdfOutline(title.toUnicodeString(), current, parentOutline);
alreadyVisitedOutlinesSet.add(current);
addOutlineToPage(currentOutline, current, names);
parentOutline.getAllChildren().add(currentOutline);
PdfDictionary first = current.getAsDictionary(PdfName.First);
PdfDictionary next = current.getAsDictionary(PdfName.Next);
if (first != null) {
if (alreadyVisitedOutlinesSet.contains(first)) {
if (!isLenientLevel) {
throw new PdfException(MessageFormatUtil.format(
KernelExceptionMessageConstant.CORRUPTED_OUTLINE_DICTIONARY_HAS_INFINITE_LOOP, first));
}
LOGGER.warn(MessageFormatUtil.format(
KernelLogMessageConstant.CORRUPTED_OUTLINE_DICTIONARY_HAS_INFINITE_LOOP, first));
return;
}
// Down in hierarchy; when returning up, process `next`.
nextUnprocessedChildForParentMap.put(parentOutline, next);
parentOutline = currentOutline;
current = first;
} else if (next != null) {
if (alreadyVisitedOutlinesSet.contains(next)) {
if (!isLenientLevel) {
throw new PdfException(MessageFormatUtil.format(
KernelExceptionMessageConstant.CORRUPTED_OUTLINE_DICTIONARY_HAS_INFINITE_LOOP, next));
}
LOGGER.warn(MessageFormatUtil.format(
KernelLogMessageConstant.CORRUPTED_OUTLINE_DICTIONARY_HAS_INFINITE_LOOP, next));
return;
}
// Next sibling in hierarchy
current = next;
} else {
// Up in hierarchy using 'nextUnprocessedChildForParentMap'.
current = null;
while (current == null && parentOutline != null) {
parentOutline = parentOutline.getParent();
if (parentOutline != null) {
current = nextUnprocessedChildForParentMap.get(parentOutline);
}
}
}
}
}
PdfDestination copyDestination(PdfObject dest, Map page2page, PdfDocument toDocument) {
if (null == dest) {
return null;
}
PdfDestination d = null;
if (dest.isArray()) {
PdfObject pageObject = ((PdfArray) dest).get(0);
for (PdfPage oldPage : page2page.keySet()) {
if (oldPage.getPdfObject() == pageObject) {
// in the copiedArray old page ref will be correctly replaced by the new page ref
// as this page is already copied
final PdfArray copiedArray = (PdfArray) dest.copyTo(toDocument, false,
NullCopyFilter.getInstance());
d = new PdfExplicitDestination(copiedArray);
break;
}
}
} else if (dest.isString() || dest.isName()) {
PdfNameTree destsTree = getNameTree(PdfName.Dests);
Map dests = destsTree.getNames();
PdfString srcDestName = dest.isString() ? (PdfString) dest : new PdfString(((PdfName) dest).getValue());
PdfArray srcDestArray = (PdfArray) dests.get(srcDestName);
if (srcDestArray != null) {
PdfObject pageObject = srcDestArray.get(0);
if (pageObject instanceof PdfNumber)
pageObject = getDocument().getPage(((PdfNumber) pageObject).intValue() + 1).getPdfObject();
for (PdfPage oldPage : page2page.keySet()) {
if (oldPage.getPdfObject() == pageObject) {
d = new PdfStringDestination(srcDestName);
if (!isEqualSameNameDestExist(page2page, toDocument, srcDestName, srcDestArray, oldPage)) {
// in the copiedArray old page ref will be correctly replaced by the new page ref as this
// page is already copied
PdfArray copiedArray = (PdfArray) srcDestArray.copyTo(toDocument, false);
// here we can safely replace first item of the array because array of NamedDestination or
// StringDestination never refers to page in another document via PdfNumber, but should
// always refer to page within current document via page object reference.
copiedArray.set(0, page2page.get(oldPage).getPdfObject());
toDocument.addNamedDestination(srcDestName, copiedArray);
}
break;
}
}
}
}
return d;
}
PdfDictionary fillAndGetOcPropertiesDictionary() {
if (ocProperties != null) {
ocProperties.fillDictionary(false);
getPdfObject().put(PdfName.OCProperties, ocProperties.getPdfObject());
ocProperties = null;
}
if (getPdfObject().getAsDictionary(PdfName.OCProperties) == null) {
final PdfDictionary pdfDictionary = new PdfDictionary();
pdfDictionary.makeIndirect(getDocument());
getDocument().getCatalog().getPdfObject().put(PdfName.OCProperties, pdfDictionary);
}
return getPdfObject().getAsDictionary(PdfName.OCProperties);
}
private boolean isEqualSameNameDestExist(Map page2page, PdfDocument toDocument,
PdfString srcDestName, PdfArray srcDestArray, PdfPage oldPage) {
PdfArray sameNameDest = (PdfArray) toDocument.getCatalog().getNameTree(PdfName.Dests).
getNames().get(srcDestName);
boolean equalSameNameDestExists = false;
if (sameNameDest != null && sameNameDest.getAsDictionary(0) != null) {
PdfIndirectReference existingDestPageRef = sameNameDest.getAsDictionary(0).getIndirectReference();
PdfIndirectReference newDestPageRef = page2page.get(oldPage).getPdfObject().getIndirectReference();
if (equalSameNameDestExists = existingDestPageRef.equals(newDestPageRef) &&
sameNameDest.size() == srcDestArray.size()) {
for (int i = 1; i < sameNameDest.size(); ++i) {
equalSameNameDestExists = equalSameNameDestExists &&
sameNameDest.get(i).equals(srcDestArray.get(i));
}
}
}
return equalSameNameDestExists;
}
private void addOutlineToPage(PdfOutline outline, IPdfNameTreeAccess names) {
PdfObject pageObj = outline.getDestination().getDestinationPage(names);
if (pageObj instanceof PdfNumber) {
final int pageNumber = ((PdfNumber) pageObj).intValue() + 1;
try {
pageObj = getDocument().getPage(pageNumber).getPdfObject();
} catch (IndexOutOfBoundsException ex) {
pageObj = null;
LOGGER.warn(MessageFormatUtil.format(
IoLogMessageConstant.OUTLINE_DESTINATION_PAGE_NUMBER_IS_OUT_OF_BOUNDS, pageNumber)
);
}
}
if (pageObj != null) {
List outs = pagesWithOutlines.get(pageObj);
if (outs == null) {
outs = new ArrayList<>();
pagesWithOutlines.put(pageObj, outs);
}
outs.add(outline);
}
}
private void addOutlineToPage(PdfOutline outline, PdfDictionary item, IPdfNameTreeAccess names) {
PdfObject dest = item.get(PdfName.Dest);
if (dest != null) {
PdfDestination destination = PdfDestination.makeDestination(dest);
outline.setDestination(destination);
addOutlineToPage(outline, names);
} else {
//Take into account outlines that specify their destination through an action
PdfDictionary action = item.getAsDictionary(PdfName.A);
if (action != null) {
PdfName actionType = action.getAsName(PdfName.S);
//Check if it is a go to action
if (PdfName.GoTo.equals(actionType)) {
//Retrieve destination if it is.
PdfObject destObject = action.get(PdfName.D);
if (destObject != null) {
//Page is always the first object
PdfDestination destination = PdfDestination.makeDestination(destObject);
outline.setDestination(destination);
addOutlineToPage(outline, names);
}
}
}
}
}
}
