Java tutorial
/* * Copyright 2003 by 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.lowagie.text.pdf; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.util.HashMap; /** Reads an FDF form and makes the fields available * @author Paulo Soares (psoares@consiste.pt) */ public class FdfReader extends PdfReader { HashMap fields; String fileSpec; PdfName encoding; /** Reads an FDF form. * @param filename the file name of the form * @throws IOException on error */ public FdfReader(String filename) throws IOException { super(filename); } /** Reads an FDF form. * @param pdfIn the byte array with the form * @throws IOException on error */ public FdfReader(byte pdfIn[]) throws IOException { super(pdfIn); } /** Reads an FDF form. * @param url the URL of the document * @throws IOException on error */ public FdfReader(URL url) throws IOException { super(url); } /** Reads an FDF form. * @param is the <CODE>InputStream</CODE> containing the document. The stream is read to the * end but is not closed * @throws IOException on error */ public FdfReader(InputStream is) throws IOException { super(is); } protected void readPdf() throws IOException { fields = new HashMap(); try { tokens.checkFdfHeader(); rebuildXref(); readDocObj(); } finally { try { tokens.close(); } catch (Exception e) { // empty on purpose } } readFields(); } protected void kidNode(PdfDictionary merged, String name) { PdfArray kids = merged.getAsArray(PdfName.KIDS); if (kids == null || kids.isEmpty()) { if (name.length() > 0) name = name.substring(1); fields.put(name, merged); } else { merged.remove(PdfName.KIDS); for (int k = 0; k < kids.size(); ++k) { PdfDictionary dic = new PdfDictionary(); dic.merge(merged); PdfDictionary newDic = kids.getAsDict(k); PdfString t = newDic.getAsString(PdfName.T); String newName = name; if (t != null) newName += "." + t.toUnicodeString(); dic.merge(newDic); dic.remove(PdfName.T); kidNode(dic, newName); } } } protected void readFields() { catalog = trailer.getAsDict(PdfName.ROOT); PdfDictionary fdf = catalog.getAsDict(PdfName.FDF); if (fdf == null) return; PdfString fs = fdf.getAsString(PdfName.F); if (fs != null) fileSpec = fs.toUnicodeString(); PdfArray fld = fdf.getAsArray(PdfName.FIELDS); if (fld == null) return; encoding = fdf.getAsName(PdfName.ENCODING); PdfDictionary merged = new PdfDictionary(); merged.put(PdfName.KIDS, fld); kidNode(merged, ""); } /** Gets all the fields. The map is keyed by the fully qualified * field name and the value is a merged <CODE>PdfDictionary</CODE> * with the field content. * @return all the fields */ public HashMap getFields() { return fields; } /** Gets the field dictionary. * @param name the fully qualified field name * @return the field dictionary */ public PdfDictionary getField(String name) { return (PdfDictionary) fields.get(name); } /** Gets the field value or <CODE>null</CODE> if the field does not * exist or has no value defined. * @param name the fully qualified field name * @return the field value or <CODE>null</CODE> */ public String getFieldValue(String name) { PdfDictionary field = (PdfDictionary) fields.get(name); if (field == null) return null; PdfObject v = getPdfObject(field.get(PdfName.V)); if (v == null) return null; if (v.isName()) return PdfName.decodeName(((PdfName) v).toString()); else if (v.isString()) { PdfString vs = (PdfString) v; if (encoding == null || vs.getEncoding() != null) return vs.toUnicodeString(); byte b[] = vs.getBytes(); if (b.length >= 2 && b[0] == (byte) 254 && b[1] == (byte) 255) return vs.toUnicodeString(); try { if (encoding.equals(PdfName.SHIFT_JIS)) return new String(b, "SJIS"); else if (encoding.equals(PdfName.UHC)) return new String(b, "MS949"); else if (encoding.equals(PdfName.GBK)) return new String(b, "GBK"); else if (encoding.equals(PdfName.BIGFIVE)) return new String(b, "Big5"); } catch (Exception e) { } return vs.toUnicodeString(); } return null; } /** Gets the PDF file specification contained in the FDF. * @return the PDF file specification contained in the FDF */ public String getFileSpec() { return fileSpec; } }