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/*
* $Id: PdfReaderInstance.java 3527 2008-07-06 15:34:38Z blowagie $
*
* Copyright 2001, 2002 Paulo Soares
*
* 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 java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
/**
* Instance of PdfReader in each output document.
*
* @author Paulo Soares ([email protected])
*/
class PdfReaderInstance {
private static final PdfLiteral IDENTITYMATRIX = new PdfLiteral("[1 0 0 1 0 0]");
private static final PdfNumber ONE = new PdfNumber(1);
private final int myXref[];
private final PdfReader reader;
private final RandomAccessFileOrArray file;
private final HashMap importedPages = new LinkedHashMap();
private final PdfWriter writer;
private final HashMap visited = new LinkedHashMap();
private ArrayList nextRound = new ArrayList();
PdfReaderInstance(final PdfReader reader, final PdfWriter writer) {
this.reader = reader;
this.writer = writer;
this.file = reader.getSafeFile();
this.myXref = new int[reader.getXrefSize()];
}
PdfReader getReader() {
return this.reader;
}
PdfImportedPage getImportedPage(final int pageNumber) {
if (!this.reader.isOpenedWithFullPermissions()) {
throw new IllegalArgumentException("PdfReader not opened with owner password");
}
if (pageNumber < 1 || pageNumber > this.reader.getNumberOfPages()) {
throw new IllegalArgumentException("Invalid page number: " + pageNumber);
}
final Integer i = Integer.valueOf(pageNumber);
PdfImportedPage pageT = (PdfImportedPage)this.importedPages.get(i);
if (pageT == null) {
pageT = new PdfImportedPage(this, this.writer, pageNumber);
this.importedPages.put(i, pageT);
}
return pageT;
}
int getNewObjectNumber(final int number, final int generation) {
if (this.myXref[number] == 0) {
this.myXref[number] = this.writer.getIndirectReferenceNumber();
this.nextRound.add(Integer.valueOf(number));
}
return this.myXref[number];
}
RandomAccessFileOrArray getReaderFile() {
return this.file;
}
PdfObject getResources(final int pageNumber) {
final PdfObject obj = PdfReader.getPdfObjectRelease(this.reader.getPageNRelease(pageNumber).get(PdfName.RESOURCES));
return obj;
}
/**
* Gets the content stream of a page as a PdfStream object.
* @param pageNumber the page of which you want the stream
* @param compressionLevel the compression level you want to apply to the stream
* @return a PdfStream object
* @since 2.1.3 (the method already existed without param compressionLevel)
*/
PdfStream getFormXObject(final int pageNumber, final int compressionLevel) throws IOException {
final PdfDictionary page = this.reader.getPageNRelease(pageNumber);
final PdfObject contents = PdfReader.getPdfObjectRelease(page.get(PdfName.CONTENTS));
final PdfDictionary dic = new PdfDictionary();
byte bout[] = null;
if (contents != null) {
if (contents.isStream()) {
dic.putAll((PRStream)contents);
} else {
bout = this.reader.getPageContent(pageNumber, this.file);
}
} else {
bout = new byte[0];
}
dic.put(PdfName.RESOURCES, PdfReader.getPdfObjectRelease(page.get(PdfName.RESOURCES)));
dic.put(PdfName.TYPE, PdfName.XOBJECT);
dic.put(PdfName.SUBTYPE, PdfName.FORM);
final PdfImportedPage impPage = (PdfImportedPage)this.importedPages.get(Integer.valueOf(pageNumber));
dic.put(PdfName.BBOX, new PdfRectangle(impPage.getBoundingBox()));
final PdfArray matrix = impPage.getMatrix();
if (matrix == null) {
dic.put(PdfName.MATRIX, IDENTITYMATRIX);
} else {
dic.put(PdfName.MATRIX, matrix);
}
dic.put(PdfName.FORMTYPE, ONE);
PRStream stream;
if (bout == null) {
stream = new PRStream((PRStream)contents, dic);
}
else {
stream = new PRStream(this.reader, bout, compressionLevel);
stream.putAll(dic);
}
return stream;
}
private void writeAllVisited() throws IOException {
while (!this.nextRound.isEmpty()) {
final ArrayList vec = this.nextRound;
this.nextRound = new ArrayList();
for (int k = 0; k < vec.size(); ++k) {
final Integer i = (Integer)vec.get(k);
if (!this.visited.containsKey(i)) {
this.visited.put(i, null);
final int n = i.intValue();
this.writer.addToBody(this.reader.getPdfObjectRelease(n), this.myXref[n]);
}
}
}
}
void writeAllPages() throws IOException {
try {
this.file.reOpen();
for (final Iterator it = this.importedPages.values().iterator(); it.hasNext();) {
final PdfImportedPage ip = (PdfImportedPage)it.next();
this.writer.addToBody(ip.getFormXObject(this.writer.getCompressionLevel()), ip.getIndirectReference());
}
writeAllVisited();
}
finally {
try {
this.reader.close();
this.file.close();
}
catch (final Exception e) {
//Empty on purpose
}
}
}
}
