edu.harvard.hul.ois.jhove.module.pdf.PdfXMPSource Maven / Gradle / Ivy
/**********************************************************************
* Jhove - JSTOR/Harvard Object Validation Environment
* Copyright 2003 by JSTOR and the President and Fellows of Harvard College
**********************************************************************/
package edu.harvard.hul.ois.jhove.module.pdf;
//import java.io.InputStream;
import java.io.*;
import edu.harvard.hul.ois.jhove.XMLWrapperStream;
//import edu.harvard.hul.ois.jhove.XMPSource;
/**
* Class for providing an InputSource to XMPHandler.
* Only an InputSource based on a Reader is supported.
*
* @author Gary McGath
*
*/
public final class PdfXMPSource
extends edu.harvard.hul.ois.jhove.XMPSource {
private PdfStream _stream;
private RandomAccessFile _raf;
protected String _encoding;
/**
* Constructor based on Stream object.
* Since a double read may be necessary, we have
* one version without encoding (before it's known),
* and another with encoding.
*
* @param stream PDFStream containing the XMP
* @param raf The RandomAccessFile object underlying the PDF
*/
public PdfXMPSource(PdfStream stream,
RandomAccessFile raf) {
super (new InputStreamReader
(new XMLWrapperStream
(new StreamInputStream (stream, raf),
"XMP", "1.0", null, null)));
//super(rdr);
_stream = stream;
_raf = raf;
}
/**
* Constructor based on Stream object with
* encoding specified.
*
* @param stream PDFStream containing the XMP
* @param raf The RandomAccessFile object underlying the PDF
* @param encoding The character encoding to use
*/
public PdfXMPSource(PdfStream stream,
RandomAccessFile raf,
String encoding)
throws UnsupportedEncodingException {
super (new InputStreamReader
(new StreamInputStream (stream, raf), encoding));
//super(rdr);
_stream = stream;
_raf = raf;
_encoding = encoding;
}
/* (non-Javadoc)
*
* Resets the reader by reinitializing it from the PdfStream.
*
* @see edu.harvard.hul.ois.jhove.XMPSource#resetReader()
*/
@Override
protected void resetReader() {
try {
if (_encoding == null) {
_reader = new InputStreamReader
(new StreamInputStream (_stream, _raf));
}
else {
_reader = new InputStreamReader
(new StreamInputStream
(_stream, _raf), _encoding);
}
}
catch (UnsupportedEncodingException e) {
// Has no business happening if it didn't the first time.
}
}
}