org.apache.pdfbox.pdmodel.fdf.FDFDocument Maven / Gradle / Ivy
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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.fdf;
import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdfparser.NonSequentialPDFParser;
import org.apache.pdfbox.pdfwriter.COSWriter;
import org.apache.pdfbox.util.XMLUtil;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* This is the in-memory representation of the FDF document. You need to call
* close() on this object when you are done using it!!
*
* @author Ben Litchfield
*/
public class FDFDocument implements Closeable
{
private COSDocument document;
/**
* Constructor, creates a new FDF document.
*
* @throws IOException If there is an error creating this document.
*/
public FDFDocument() throws IOException
{
document = new COSDocument();
document.setHeaderString( "%FDF-1.2" );
//First we need a trailer
document.setTrailer( new COSDictionary() );
//Next we need the root dictionary.
FDFCatalog catalog = new FDFCatalog();
setCatalog( catalog );
}
/**
* Constructor that uses an existing document. The COSDocument that
* is passed in must be valid.
*
* @param doc The COSDocument that this document wraps.
*/
public FDFDocument( COSDocument doc )
{
document = doc;
}
/**
* This will create an FDF document from an XFDF XML document.
*
* @param doc The XML document that contains the XFDF data.
* @throws IOException If there is an error reading from the dom.
*/
public FDFDocument( Document doc ) throws IOException
{
this();
Element xfdf = doc.getDocumentElement();
if( !xfdf.getNodeName().equals( "xfdf" ) )
{
throw new IOException( "Error while importing xfdf document, " +
"root should be 'xfdf' and not '" + xfdf.getNodeName() + "'" );
}
FDFCatalog cat = new FDFCatalog( xfdf );
setCatalog( cat );
}
/**
* This will write this element as an XML document.
*
* @param output The stream to write the xml to.
*
* @throws IOException If there is an error writing the XML.
*/
public void writeXML( Writer output ) throws IOException
{
output.write( "\n" );
output.write( "\n" );
getCatalog().writeXML( output );
output.write( " \n" );
}
/**
* This will get the low level document.
*
* @return The document that this layer sits on top of.
*/
public COSDocument getDocument()
{
return document;
}
/**
* This will get the FDF Catalog. This is guaranteed to not return null.
*
* @return The documents /Root dictionary
*/
public FDFCatalog getCatalog()
{
FDFCatalog retval = null;
COSDictionary trailer = document.getTrailer();
COSDictionary root = (COSDictionary)trailer.getDictionaryObject( COSName.ROOT );
if( root == null )
{
retval = new FDFCatalog();
setCatalog( retval );
}
else
{
retval = new FDFCatalog( root );
}
return retval;
}
/**
* This will set the FDF catalog for this FDF document.
*
* @param cat The FDF catalog.
*/
public void setCatalog( FDFCatalog cat )
{
COSDictionary trailer = document.getTrailer();
trailer.setItem( COSName.ROOT, cat );
}
/**
* This will load a document from a file.
*
* @param filename The name of the file to load.
*
* @return The document that was loaded.
*
* @throws IOException If there is an error reading from the stream.
*/
public static FDFDocument load( String filename ) throws IOException
{
return load(new File(filename));
}
/**
* This will load a document from a file.
*
* @param file The name of the file to load.
*
* @return The document that was loaded.
*
* @throws IOException If there is an error reading from the stream.
*/
public static FDFDocument load( File file ) throws IOException
{
NonSequentialPDFParser parser = new NonSequentialPDFParser(file, null);
parser.parse();
return parser.getFDFDocument();
}
/**
* This will load a document from an input stream.
*
* @param input The stream that contains the document.
*
* @return The document that was loaded.
*
* @throws IOException If there is an error reading from the stream.
*/
public static FDFDocument load( InputStream input ) throws IOException
{
NonSequentialPDFParser parser = new NonSequentialPDFParser(input);
parser.parse();
return parser.getFDFDocument();
}
/**
* This will load a document from a file.
*
* @param filename The name of the file to load.
*
* @return The document that was loaded.
*
* @throws IOException If there is an error reading from the stream.
*/
public static FDFDocument loadXFDF( String filename ) throws IOException
{
return loadXFDF( new BufferedInputStream( new FileInputStream( filename ) ) );
}
/**
* This will load a document from a file.
*
* @param file The name of the file to load.
*
* @return The document that was loaded.
*
* @throws IOException If there is an error reading from the stream.
*/
public static FDFDocument loadXFDF( File file ) throws IOException
{
return loadXFDF( new BufferedInputStream( new FileInputStream( file ) ) );
}
/**
* This will load a document from an input stream.
*
* @param input The stream that contains the document.
*
* @return The document that was loaded.
*
* @throws IOException If there is an error reading from the stream.
*/
public static FDFDocument loadXFDF( InputStream input ) throws IOException
{
Document doc = XMLUtil.parse( input );
return new FDFDocument( doc );
}
/**
* This will save this document to the filesystem.
*
* @param fileName The file to save as.
*
* @throws IOException If there is an error saving the document.
* @throws COSVisitorException If an error occurs while generating the data.
*/
public void save( File fileName ) throws IOException, COSVisitorException
{
save( new FileOutputStream( fileName ) );
}
/**
* This will save this document to the filesystem.
*
* @param fileName The file to save as.
*
* @throws IOException If there is an error saving the document.
* @throws COSVisitorException If an error occurs while generating the data.
*/
public void save( String fileName ) throws IOException, COSVisitorException
{
save( new FileOutputStream( fileName ) );
}
/**
* This will save the document to an output stream.
*
* @param output The stream to write to.
*
* @throws IOException If there is an error writing the document.
* @throws COSVisitorException If an error occurs while generating the data.
*/
public void save( OutputStream output ) throws IOException, COSVisitorException
{
COSWriter writer = null;
try
{
writer = new COSWriter( output );
writer.write( document );
writer.close();
}
finally
{
if( writer != null )
{
writer.close();
}
}
}
/**
* This will save this document to the filesystem.
*
* @param fileName The file to save as.
*
* @throws IOException If there is an error saving the document.
* @throws COSVisitorException If an error occurs while generating the data.
*/
public void saveXFDF( File fileName ) throws IOException, COSVisitorException
{
saveXFDF(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName), "UTF-8")));
}
/**
* This will save this document to the filesystem.
*
* @param fileName The file to save as.
*
* @throws IOException If there is an error saving the document.
* @throws COSVisitorException If an error occurs while generating the data.
*/
public void saveXFDF( String fileName ) throws IOException, COSVisitorException
{
saveXFDF(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName), "UTF-8")));
}
/**
* This will save the document to an output stream and close the stream.
*
* @param output The stream to write to.
*
* @throws IOException If there is an error writing the document.
* @throws COSVisitorException If an error occurs while generating the data.
*/
public void saveXFDF( Writer output ) throws IOException, COSVisitorException
{
try
{
writeXML( output );
}
finally
{
if( output != null )
{
output.close();
}
}
}
/**
* This will close the underlying COSDocument object.
*
* @throws IOException If there is an error releasing resources.
*/
public void close() throws IOException
{
document.close();
}
}