Java tutorial
/* * $Id: PdfLister.java 3735 2009-02-26 01:44:03Z xlv $ * * Copyright 2002 Mark Thompson * * 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. * * This class by Mark Thompson. Copyright (C) 2002 Mark Thompson * * 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.lowagie.text.pdf; import java.io.IOException; import java.io.PrintStream; import java.util.Iterator; /** * List a PDF file in human-readable form (for debugging reasons mostly) * @author Mark Thompson */ public class PdfLister { /** the printStream you want to write the output to. */ PrintStream out; /** * Create a new lister object. * @param out */ public PdfLister(PrintStream out) { this.out = out; } /** * Visualizes a PDF object. * @param object a com.lowagie.text.pdf object */ public void listAnyObject(PdfObject object) { switch (object.type()) { case PdfObject.ARRAY: listArray((PdfArray) object); break; case PdfObject.DICTIONARY: listDict((PdfDictionary) object); break; case PdfObject.STRING: out.println("(" + object.toString() + ")"); break; default: out.println(object.toString()); break; } } /** * Visualizes a PdfDictionary object. * @param dictionary a com.lowagie.text.pdf.PdfDictionary object */ public void listDict(PdfDictionary dictionary) { out.println("<<"); PdfName key; PdfObject value; for (Iterator i = dictionary.getKeys().iterator(); i.hasNext();) { key = (PdfName) i.next(); value = dictionary.get(key); out.print(key.toString()); out.print(' '); listAnyObject(value); } out.println(">>"); } /** * Visualizes a PdfArray object. * @param array a com.lowagie.text.pdf.PdfArray object */ public void listArray(PdfArray array) { out.println('['); for (Iterator i = array.listIterator(); i.hasNext();) { PdfObject item = (PdfObject) i.next(); listAnyObject(item); } out.println(']'); } /** * Visualizes a Stream. * @param stream * @param reader */ public void listStream(PRStream stream, PdfReaderInstance reader) { try { listDict(stream); out.println("startstream"); byte[] b = PdfReader.getStreamBytes(stream); // byte buf[] = new byte[Math.min(stream.getLength(), 4096)]; // int r = 0; // stream.openStream(reader); // for (;;) { // r = stream.readStream(buf, 0, buf.length); // if (r == 0) break; // out.write(buf, 0, r); // } // stream.closeStream(); int len = b.length - 1; for (int k = 0; k < len; ++k) { if (b[k] == '\r' && b[k + 1] != '\n') b[k] = (byte) '\n'; } out.println(new String(b)); out.println("endstream"); } catch (IOException e) { System.err.println("I/O exception: " + e); // } catch (java.util.zip.DataFormatException e) { // System.err.println("Data Format Exception: " + e); } } /** * Visualizes an imported page * @param iPage */ public void listPage(PdfImportedPage iPage) { int pageNum = iPage.getPageNumber(); PdfReaderInstance readerInst = iPage.getPdfReaderInstance(); PdfReader reader = readerInst.getReader(); PdfDictionary page = reader.getPageN(pageNum); listDict(page); PdfObject obj = PdfReader.getPdfObject(page.get(PdfName.CONTENTS)); if (obj == null) return; switch (obj.type) { case PdfObject.STREAM: listStream((PRStream) obj, readerInst); break; case PdfObject.ARRAY: for (Iterator i = ((PdfArray) obj).listIterator(); i.hasNext();) { PdfObject o = PdfReader.getPdfObject((PdfObject) i.next()); listStream((PRStream) o, readerInst); out.println("-----------"); } break; } } }