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 * Copyright (c) 2003-2005, www.pdfbox.org
 * All rights reserved.
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 * 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;
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://www.pdfbox.org
 *
 */
package org.pdfbox.examples.pdmodel;

import org.pdfbox.exceptions.InvalidPasswordException;

import org.pdfbox.pdfparser.PDFParser;

import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDDocumentCatalog;
import org.pdfbox.pdmodel.PDDocumentInformation;
import org.pdfbox.pdmodel.common.PDMetadata;

import java.io.FileInputStream;
import java.io.IOException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

/**
 * This is an example on how to get a documents metadata information.
 *
 * Usage: java org.pdfbox.examples.pdmodel.PrintDocumentMetaData <input-pdf>
 *
 * @author Ben Litchfield (ben@benlitchfield.com)
 * @version $Revision: 1.10 $
 */
public class PrintDocumentMetaData
{
    /**
     * This will print the documents data.
     *
     * @param args The command line arguments.
     *
     * @throws Exception If there is an error parsing the document.
     */
    public static void main( String[] args ) throws Exception
    {
        if( args.length != 1 )
        {
            usage();
        }
        else
        {
            PDDocument document = null;
            FileInputStream file = null;
            try
            {
                file = new FileInputStream( args[0] );
                PDFParser parser = new PDFParser( file );
                parser.parse();
                document = parser.getPDDocument();
                if( document.isEncrypted() )
                {
                    try
                    {
                        document.decrypt( "" );
                    }
                    catch( InvalidPasswordException e )
                    {
                        System.err.println( "Error: Document is encrypted with a password." );
                        System.exit( 1 );
                    }
                }
                PrintDocumentMetaData meta = new PrintDocumentMetaData();
                meta.printMetadata( document );
            }
            finally
            {
                if( file != null )
                {
                    file.close();
                }
                if( document != null )
                {
                    document.close();
                }
            }
        }
    }

    /**
     * This will print the usage for this document.
     */
    private static void usage()
    {
        System.err.println( "Usage: java org.pdfbox.examples.pdmodel.PrintDocumentMetaData <input-pdf>" );
    }

    /**
     * This will print the documents data to System.out.
     *
     * @param document The document to get the metadata from.
     *
     * @throws IOException If there is an error getting the page count.
     */
    public void printMetadata( PDDocument document ) throws IOException
    {
        PDDocumentInformation info = document.getDocumentInformation();
        PDDocumentCatalog cat = document.getDocumentCatalog();
        PDMetadata metadata = cat.getMetadata();
        System.out.println( "Page Count=" + document.getNumberOfPages() );
        System.out.println( "Title=" + info.getTitle() );
        System.out.println( "Author=" + info.getAuthor() );
        System.out.println( "Subject=" + info.getSubject() );
        System.out.println( "Keywords=" + info.getKeywords() );
        System.out.println( "Creator=" + info.getCreator() );
        System.out.println( "Producer=" + info.getProducer() );
        System.out.println( "Creation Date=" + formatDate( info.getCreationDate() ) );
        System.out.println( "Modification Date=" + formatDate( info.getModificationDate() ) );
        System.out.println( "Trapped=" + info.getTrapped() );
        if( metadata != null )
        {
            System.out.println( "Metadata=" + metadata.getInputStreamAsString() );
        }
    }

    /**
     * This will format a date object.
     *
     * @param date The date to format.
     *
     * @return A string representation of the date.
     */
    private String formatDate( Calendar date )
    {
        String retval = null;
        if( date != null )
        {
            SimpleDateFormat formatter = new SimpleDateFormat();
            retval = formatter.format( date.getTime() );
        }

        return retval;
    }
}