Java tutorial
/* * $Id: PdfDate.java 3117 2008-01-31 05:53:22Z xlv $ * * 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.lowagie.text.pdf; import java.util.Calendar; import java.util.GregorianCalendar; import java.util.SimpleTimeZone; /** * <CODE>PdfDate</CODE> is the PDF date object. * <P> * PDF defines a standard date format. The PDF date format closely follows the format * defined by the international standard ASN.1 (Abstract Syntax Notation One, defined * in CCITT X.208 or ISO/IEC 8824). A date is a <CODE>PdfString</CODE> of the form: * <P><BLOCKQUOTE> * (D:YYYYMMDDHHmmSSOHH'mm') * </BLOCKQUOTE><P> * This object is described in the 'Portable Document Format Reference Manual version 1.3' * section 7.2 (page 183-184) * * @see PdfString * @see java.util.GregorianCalendar */ public class PdfDate extends PdfString { private static final int DATE_SPACE[] = { Calendar.YEAR, 4, 0, Calendar.MONTH, 2, -1, Calendar.DAY_OF_MONTH, 2, 0, Calendar.HOUR_OF_DAY, 2, 0, Calendar.MINUTE, 2, 0, Calendar.SECOND, 2, 0 }; // constructors /** * Constructs a <CODE>PdfDate</CODE>-object. * * @param d the date that has to be turned into a <CODE>PdfDate</CODE>-object */ public PdfDate(Calendar d) { super(); StringBuffer date = new StringBuffer("D:"); date.append(setLength(d.get(Calendar.YEAR), 4)); date.append(setLength(d.get(Calendar.MONTH) + 1, 2)); date.append(setLength(d.get(Calendar.DATE), 2)); date.append(setLength(d.get(Calendar.HOUR_OF_DAY), 2)); date.append(setLength(d.get(Calendar.MINUTE), 2)); date.append(setLength(d.get(Calendar.SECOND), 2)); int timezone = (d.get(Calendar.ZONE_OFFSET) + d.get(Calendar.DST_OFFSET)) / (60 * 60 * 1000); if (timezone == 0) { date.append('Z'); } else if (timezone < 0) { date.append('-'); timezone = -timezone; } else { date.append('+'); } if (timezone != 0) { date.append(setLength(timezone, 2)).append('\''); int zone = Math.abs((d.get(Calendar.ZONE_OFFSET) + d.get(Calendar.DST_OFFSET)) / (60 * 1000)) - (timezone * 60); date.append(setLength(zone, 2)).append('\''); } value = date.toString(); } /** * Constructs a <CODE>PdfDate</CODE>-object, representing the current day and time. */ public PdfDate() { this(new GregorianCalendar()); } /** * Adds a number of leading zeros to a given <CODE>String</CODE> in order to get a <CODE>String</CODE> * of a certain length. * * @param i a given number * @param length the length of the resulting <CODE>String</CODE> * @return the resulting <CODE>String</CODE> */ private String setLength(int i, int length) { // 1.3-1.4 problem fixed by Finn Bock StringBuffer tmp = new StringBuffer(); tmp.append(i); while (tmp.length() < length) { tmp.insert(0, "0"); } tmp.setLength(length); return tmp.toString(); } /** * Gives the W3C format of the PdfDate. * @return a formatted date */ public String getW3CDate() { return getW3CDate(value); } /** * Gives the W3C format of the PdfDate. * @param d the date in the format D:YYYYMMDDHHmmSSOHH'mm' * @return a formatted date */ public static String getW3CDate(String d) { if (d.startsWith("D:")) d = d.substring(2); StringBuffer sb = new StringBuffer(); if (d.length() < 4) return "0000"; sb.append(d.substring(0, 4)); //year d = d.substring(4); if (d.length() < 2) return sb.toString(); sb.append('-').append(d.substring(0, 2)); //month d = d.substring(2); if (d.length() < 2) return sb.toString(); sb.append('-').append(d.substring(0, 2)); //day d = d.substring(2); if (d.length() < 2) return sb.toString(); sb.append('T').append(d.substring(0, 2)); //hour d = d.substring(2); if (d.length() < 2) { sb.append(":00Z"); return sb.toString(); } sb.append(':').append(d.substring(0, 2)); //minute d = d.substring(2); if (d.length() < 2) { sb.append('Z'); return sb.toString(); } sb.append(':').append(d.substring(0, 2)); //second d = d.substring(2); if (d.startsWith("-") || d.startsWith("+")) { String sign = d.substring(0, 1); d = d.substring(1); String h = "00"; String m = "00"; if (d.length() >= 2) { h = d.substring(0, 2); if (d.length() > 2) { d = d.substring(3); if (d.length() >= 2) m = d.substring(0, 2); } sb.append(sign).append(h).append(':').append(m); return sb.toString(); } } sb.append('Z'); return sb.toString(); } /** * Converts a PDF string representing a date into a Calendar. * @param s the PDF string representing a date * @return a <CODE>Calendar</CODE> representing the date or <CODE>null</CODE> if the string * was not a date */ public static Calendar decode(String s) { try { if (s.startsWith("D:")) s = s.substring(2); GregorianCalendar calendar; int slen = s.length(); int idx = s.indexOf('Z'); if (idx >= 0) { slen = idx; calendar = new GregorianCalendar(new SimpleTimeZone(0, "ZPDF")); } else { int sign = 1; idx = s.indexOf('+'); if (idx < 0) { idx = s.indexOf('-'); if (idx >= 0) sign = -1; } if (idx < 0) calendar = new GregorianCalendar(); else { int offset = Integer.parseInt(s.substring(idx + 1, idx + 3)) * 60; if (idx + 5 < s.length()) offset += Integer.parseInt(s.substring(idx + 4, idx + 6)); calendar = new GregorianCalendar(new SimpleTimeZone(offset * sign * 60000, "ZPDF")); slen = idx; } } calendar.clear(); idx = 0; for (int k = 0; k < DATE_SPACE.length; k += 3) { if (idx >= slen) break; calendar.set(DATE_SPACE[k], Integer.parseInt(s.substring(idx, idx + DATE_SPACE[k + 1])) + DATE_SPACE[k + 2]); idx += DATE_SPACE[k + 1]; } return calendar; } catch (Exception e) { return null; } } }