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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.filter;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.apache.pdfbox.cos.COSName;
/**
* This will contain manage all the different types of filters that are available.
*
* @author Ben Litchfield
* @version $Revision: 1.13 $
*/
public class FilterManager
{
private final Map filters = new HashMap();
/**
* Constructor.
*/
public FilterManager()
{
Filter flateFilter = new FlateFilter();
Filter ccittFaxFilter = new CCITTFaxDecodeFilter();
Filter lzwFilter = new LZWFilter();
Filter asciiHexFilter = new ASCIIHexFilter();
Filter ascii85Filter = new ASCII85Filter();
Filter runLengthFilter = new RunLengthDecodeFilter();
Filter cryptFilter = new CryptFilter();
Filter jpxFilter = new JPXFilter();
Filter jbig2Filter = new JBIG2Filter();
addFilter( COSName.FLATE_DECODE, flateFilter );
addFilter( COSName.FLATE_DECODE_ABBREVIATION, flateFilter );
addFilter( COSName.DCT_DECODE, jpxFilter);
addFilter( COSName.DCT_DECODE_ABBREVIATION, jpxFilter);
addFilter( COSName.CCITTFAX_DECODE, ccittFaxFilter );
addFilter( COSName.CCITTFAX_DECODE_ABBREVIATION, ccittFaxFilter );
addFilter( COSName.LZW_DECODE, lzwFilter );
addFilter( COSName.LZW_DECODE_ABBREVIATION, lzwFilter );
addFilter( COSName.ASCII_HEX_DECODE, asciiHexFilter );
addFilter( COSName.ASCII_HEX_DECODE_ABBREVIATION, asciiHexFilter );
addFilter( COSName.ASCII85_DECODE, ascii85Filter );
addFilter( COSName.ASCII85_DECODE_ABBREVIATION, ascii85Filter );
addFilter( COSName.RUN_LENGTH_DECODE, runLengthFilter );
addFilter( COSName.RUN_LENGTH_DECODE_ABBREVIATION, runLengthFilter );
addFilter( COSName.CRYPT, cryptFilter );
addFilter( COSName.JPX_DECODE, jpxFilter );
addFilter( COSName.JBIG2_DECODE, jbig2Filter );
}
/**
* This will get all of the filters that are available in the system.
*
* @return All available filters in the system.
*/
public Collection getFilters()
{
return filters.values();
}
/**
* This will add an available filter.
*
* @param filterName The name of the filter.
* @param filter The filter to use.
*/
public void addFilter( COSName filterName, Filter filter )
{
filters.put( filterName, filter );
}
/**
* This will get a filter by name.
*
* @param filterName The name of the filter to retrieve.
*
* @return The filter that matches the name.
*
* @throws IOException If the filter could not be found.
*/
public Filter getFilter( COSName filterName ) throws IOException
{
Filter filter = (Filter)filters.get( filterName );
if( filter == null )
{
throw new IOException( "Unknown stream filter:" + filterName );
}
return filter;
}
/**
* This will get a filter by name.
*
* @param filterName The name of the filter to retrieve.
*
* @return The filter that matches the name.
*
* @throws IOException If the filter could not be found.
*/
public Filter getFilter( String filterName ) throws IOException
{
return getFilter( COSName.getPDFName( filterName ) );
}
}