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Diffstat (limited to 'src/main/java/org/pdfbox/util/DateConverter.java')
| -rw-r--r-- | src/main/java/org/pdfbox/util/DateConverter.java | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/util/DateConverter.java b/src/main/java/org/pdfbox/util/DateConverter.java new file mode 100644 index 0000000..43d3566 --- /dev/null +++ b/src/main/java/org/pdfbox/util/DateConverter.java @@ -0,0 +1,281 @@ +/**
+ * Copyright (c) 2003-2005, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ * contributors may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.util;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+
+import java.io.IOException;
+
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+import java.util.SimpleTimeZone;
+import java.util.TimeZone;
+
+import org.pdfbox.cos.COSString;
+
+/**
+ * This class is used to convert dates to strings and back using the PDF
+ * date standards. Date are described in PDFReference1.4 section 3.8.2
+ *
+ * @author Ben Litchfield (ben@benlitchfield.com)
+ * @version $Revision: 1.9 $
+ */
+public class DateConverter
+{
+ private static final SimpleDateFormat PDF_DATE_FORMAT = new SimpleDateFormat( "yyyyMMddHHmmss" );
+
+ //The Date format is supposed to be the PDF_DATE_FORMAT, but not all PDF documents
+ //will use that date, so I have added a couple other potential formats
+ //to try if the original one does not work.
+ private static final SimpleDateFormat[] POTENTIAL_FORMATS = new SimpleDateFormat[] {
+ new SimpleDateFormat("EEEE, dd MMM yyyy hh:mm:ss a"),
+ new SimpleDateFormat("EEEE, MMM dd, yyyy hh:mm:ss a")};
+
+ private static final SimpleDateFormat ISO_8601_DATE_FORMAT = new SimpleDateFormat( "yyyy-MM-dd'T'HH:mm:ss" );
+
+ private DateConverter()
+ {
+ //utility class should not be constructed.
+ }
+
+ /**
+ * This will convert the calendar to a string.
+ *
+ * @param date The date to convert to a string.
+ *
+ * @return The date as a String to be used in a PDF document.
+ */
+ public static String toString( Calendar date )
+ {
+ String retval = null;
+ if( date != null )
+ {
+ StringBuffer buffer = new StringBuffer();
+ TimeZone zone = date.getTimeZone();
+ long offsetInMinutes = zone.getOffset( date.getTimeInMillis() )/1000/60;
+ long hours = Math.abs( offsetInMinutes/60 );
+ long minutes = Math.abs( offsetInMinutes%60 );
+ buffer.append( "D:" );
+ buffer.append( PDF_DATE_FORMAT.format( date.getTime() ) );
+ if( offsetInMinutes == 0 )
+ {
+ buffer.append( "Z" );
+ }
+ else if( offsetInMinutes < 0 )
+ {
+ buffer.append( "-" );
+ }
+ else
+ {
+ buffer.append( "+" );
+ }
+ if( hours < 10 )
+ {
+ buffer.append( "0" );
+ }
+ buffer.append( hours );
+ buffer.append( "'" );
+ if( minutes < 10 )
+ {
+ buffer.append( "0" );
+ }
+ buffer.append( minutes );
+ buffer.append( "'" );
+ retval = buffer.toString();
+
+ }
+ return retval;
+ }
+
+ /**
+ * This will convert a string to a calendar.
+ *
+ * @param date The string representation of the calendar.
+ *
+ * @return The calendar that this string represents.
+ *
+ * @throws IOException If the date string is not in the correct format.
+ */
+ public static Calendar toCalendar( COSString date ) throws IOException
+ {
+ Calendar retval = null;
+ if( date != null )
+ {
+ retval = toCalendar( date.getString() );
+ }
+
+ return retval;
+ }
+
+ /**
+ * This will convert a string to a calendar.
+ *
+ * @param date The string representation of the calendar.
+ *
+ * @return The calendar that this string represents.
+ *
+ * @throws IOException If the date string is not in the correct format.
+ */
+ public static Calendar toCalendar( String date ) throws IOException
+ {
+ Calendar retval = null;
+ if( date != null )
+ {
+ //these are the default values
+ int year = 0;
+ int month = 1;
+ int day = 1;
+ int hour = 0;
+ int minute = 0;
+ int second = 0;
+ //first string off the prefix if it exists
+ try
+ {
+ SimpleTimeZone zone = null;
+ if( date.startsWith( "D:" ) )
+ {
+ date = date.substring( 2, date.length() );
+ }
+ if( date.length() < 4 )
+ {
+ throw new IOException( "Error: Invalid date format '" + date + "'" );
+ }
+ year = Integer.parseInt( date.substring( 0, 4 ) );
+ if( date.length() >= 6 )
+ {
+ month = Integer.parseInt( date.substring( 4, 6 ) );
+ }
+ if( date.length() >= 8 )
+ {
+ day = Integer.parseInt( date.substring( 6, 8 ) );
+ }
+ if( date.length() >= 10 )
+ {
+ hour = Integer.parseInt( date.substring( 8, 10 ) );
+ }
+ if( date.length() >= 12 )
+ {
+ minute = Integer.parseInt( date.substring( 10, 12 ) );
+ }
+ if( date.length() >= 14 )
+ {
+ second = Integer.parseInt( date.substring( 12, 14 ) );
+ }
+ retval = new GregorianCalendar( year, month-1, day, hour, minute, second );
+ if( date.length() >= 15 )
+ {
+ char sign = date.charAt( 14 );
+ if( sign == 'Z' )
+ {
+ zone = new SimpleTimeZone(0,"Unknown");
+ }
+ else
+ {
+ int hours = 0;
+ int minutes = 0;
+ if( date.length() >= 17 )
+ {
+ hours = Integer.parseInt( date.substring( 15, 17 ) );
+ }
+ if( date.length() > 20 )
+ {
+ minutes = Integer.parseInt( date.substring( 18, 20 ) );
+ }
+ zone = new SimpleTimeZone( hours*60*60*1000 + minutes*60*1000, "Unknown" );
+ }
+ retval.setTimeZone( zone );
+ }
+ }
+ catch( NumberFormatException e )
+ {
+ for( int i=0; retval == null && i<POTENTIAL_FORMATS.length; i++ )
+ {
+ try
+ {
+ Date utilDate = POTENTIAL_FORMATS[i].parse( date );
+ retval = new GregorianCalendar();
+ retval.setTime( utilDate );
+ }
+ catch( ParseException pe )
+ {
+ //ignore and move to next potential format
+ }
+ }
+ if( retval == null )
+ {
+ //we didn't find a valid date format so throw an exception
+ throw new IOException( "Error converting date:" + date );
+ }
+ }
+ }
+ return retval;
+ }
+
+ /**
+ * Convert the date to iso 8601 string format.
+ *
+ * @param cal The date to convert.
+ * @return The date represented as an ISO 8601 string.
+ */
+ public static String toISO8601( Calendar cal )
+ {
+ StringBuffer retval = new StringBuffer();
+ retval.append( ISO_8601_DATE_FORMAT.format( cal.getTime() ) );
+ int timeZone = cal.get( Calendar.ZONE_OFFSET );
+ if( timeZone < 0 )
+ {
+ retval.append( "-" );
+ }
+ else
+ {
+ retval.append( "+" );
+ }
+ timeZone = Math.abs( timeZone );
+ //milliseconds/1000 = seconds = seconds / 60 = minutes = minutes/60 = hours
+ int hours = timeZone/1000/60/60;
+ int minutes = (timeZone - (hours*1000*60*60))/1000/1000;
+ if( hours < 10 )
+ {
+ retval.append( "0" );
+ }
+ retval.append( Integer.toString( hours ) );
+ retval.append( ":" );
+ if( minutes < 10 )
+ {
+ retval.append( "0" );
+ }
+ retval.append( Integer.toString( minutes ) );
+
+ return retval.toString();
+ }
+}
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