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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.pdmodel.common;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.PDDocument;
/**
* This class represents metadata for various objects in a PDF document.
*
* @author Ben Litchfield
*/
public class PDMetadata extends PDStream
{
/**
* This will create a new PDMetadata object.
*
* @param document The document that the stream will be part of.
*/
public PDMetadata( PDDocument document )
{
super( document );
getCOSObject().setName( COSName.TYPE, "Metadata" );
getCOSObject().setName( COSName.SUBTYPE, "XML" );
}
/**
* Constructor. Reads all data from the input stream and embeds it into the
* document, this will close the InputStream.
*
* @param doc The document that will hold the stream.
* @param str The stream parameter.
* @throws IOException If there is an error creating the stream in the document.
*/
public PDMetadata( PDDocument doc, InputStream str) throws IOException
{
super( doc, str );
getCOSObject().setName( COSName.TYPE, "Metadata" );
getCOSObject().setName( COSName.SUBTYPE, "XML" );
}
/**
* Constructor.
*
* @param str The stream parameter.
*/
public PDMetadata( COSStream str )
{
super( str );
}
/**
* Extract the XMP metadata.
* To persist changes back to the PDF you must call importXMPMetadata.
*
* @return A stream to get the xmp data from.
*
* @throws IOException If there is an error parsing the XMP data.
*/
public InputStream exportXMPMetadata() throws IOException
{
return createInputStream();
}
/**
* Import an XMP stream into the PDF document.
*
* @param xmp The XMP data.
*
* @throws IOException If there is an error generating the XML document.
*/
public void importXMPMetadata( byte[] xmp )
throws IOException
{
OutputStream os = createOutputStream();
os.write(xmp);
os.close();
}
}