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/*
* $Id: PdfPages.java 3934 2009-05-27 11:23:23Z blowagie $
*
* Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.aowagie.text.pdf;
import java.io.IOException;
import java.util.ArrayList;
import com.aowagie.text.Document;
import com.aowagie.text.ExceptionConverter;
/**
* PdfPages
is the PDF Pages-object.
*
* The Pages of a document are accessible through a tree of nodes known as the Pages tree.
* This tree defines the ordering of the pages in the document.
* This object is described in the 'Portable Document Format Reference Manual version 1.3'
* section 6.3 (page 71-73)
*
* @see PdfPage
*/
class PdfPages {
private final ArrayList pages = new ArrayList();
private final ArrayList parents = new ArrayList();
private final int leafSize = 10;
private final PdfWriter writer;
private PdfIndirectReference topParent;
// constructors
/**
* Constructs a PdfPages
-object.
*/
PdfPages(final PdfWriter writer) {
this.writer = writer;
}
void addPage(final PdfDictionary page) {
try {
if (this.pages.size() % this.leafSize == 0) {
this.parents.add(this.writer.getPdfIndirectReference());
}
final PdfIndirectReference parent = (PdfIndirectReference)this.parents.get(this.parents.size() - 1);
page.put(PdfName.PARENT, parent);
final PdfIndirectReference current = this.writer.getCurrentPage();
this.writer.addToBody(page, current);
this.pages.add(current);
}
catch (final Exception e) {
throw new ExceptionConverter(e);
}
}
PdfIndirectReference addPageRef(final PdfIndirectReference pageRef) {
try {
if (this.pages.size() % this.leafSize == 0) {
this.parents.add(this.writer.getPdfIndirectReference());
}
this.pages.add(pageRef);
return (PdfIndirectReference)this.parents.get(this.parents.size() - 1);
}
catch (final Exception e) {
throw new ExceptionConverter(e);
}
}
// returns the top parent to include in the catalog
PdfIndirectReference writePageTree() throws IOException {
if (this.pages.isEmpty()) {
throw new IOException("The document has no pages.");
}
int leaf = 1;
ArrayList tParents = this.parents;
ArrayList tPages = this.pages;
ArrayList nextParents = new ArrayList();
while (true) {
leaf *= this.leafSize;
final int stdCount = this.leafSize;
int rightCount = tPages.size() % this.leafSize;
if (rightCount == 0) {
rightCount = this.leafSize;
}
for (int p = 0; p < tParents.size(); ++p) {
int count;
int thisLeaf = leaf;
if (p == tParents.size() - 1) {
count = rightCount;
thisLeaf = this.pages.size() % leaf;
if (thisLeaf == 0) {
thisLeaf = leaf;
}
} else {
count = stdCount;
}
final PdfDictionary top = new PdfDictionary(PdfName.PAGES);
top.put(PdfName.COUNT, new PdfNumber(thisLeaf));
final PdfArray kids = new PdfArray();
final ArrayList internal = kids.getArrayList();
internal.addAll(tPages.subList(p * stdCount, p * stdCount + count));
top.put(PdfName.KIDS, kids);
if (tParents.size() > 1) {
if (p % this.leafSize == 0) {
nextParents.add(this.writer.getPdfIndirectReference());
}
top.put(PdfName.PARENT, (PdfIndirectReference)nextParents.get(p / this.leafSize));
}
else {
top.put(PdfName.ITXT, new PdfString(Document.getRelease()));
}
this.writer.addToBody(top, (PdfIndirectReference)tParents.get(p));
}
if (tParents.size() == 1) {
this.topParent = (PdfIndirectReference)tParents.get(0);
return this.topParent;
}
tPages = tParents;
tParents = nextParents;
nextParents = new ArrayList();
}
}
}