org.apache.pdfbox.pdfwriter.ContentStreamWriter 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.pdfwriter;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSBoolean;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSInteger;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.util.ImageParameters;
import org.apache.pdfbox.util.PDFOperator;
/**
* A class that will take a list of tokens and write out a stream with them.
*
* @author Ben Litchfield
* @version $Revision: 1.8 $
*/
public class ContentStreamWriter
{
private OutputStream output;
/**
* space character.
*/
public static final byte[] SPACE = new byte[] { 32 };
/**
* standard line separator
*/
public static final byte[] EOL = new byte[] { 0x0A };
/**
* This will create a new content stream writer.
*
* @param out The stream to write the data to.
*/
public ContentStreamWriter( OutputStream out )
{
output = out;
}
/**
* This will write out the list of tokens to the stream.
*
* @param tokens The tokens to write to the stream.
* @param start The start index into the list of tokens.
* @param end The end index into the list of tokens.
* @throws IOException If there is an error writing to the stream.
*/
public void writeTokens( List tokens, int start, int end ) throws IOException
{
for( int i=start; i entry : obj.entrySet())
{
if (entry.getValue() != null)
{
writeObject( entry.getKey() );
output.write( SPACE );
writeObject( entry.getValue() );
output.write( SPACE );
}
}
output.write( COSWriter.DICT_CLOSE );
output.write( SPACE );
}
else if( o instanceof PDFOperator )
{
PDFOperator op = (PDFOperator)o;
if( op.getOperation().equals( "BI" ) )
{
output.write( "BI".getBytes("ISO-8859-1") );
ImageParameters params = op.getImageParameters();
COSDictionary dic = params.getDictionary();
for( COSName key : dic.keySet() )
{
Object value = dic.getDictionaryObject( key );
key.writePDF( output );
output.write( SPACE );
writeObject( value );
output.write( EOL );
}
output.write( "ID".getBytes("ISO-8859-1") );
output.write( EOL );
output.write( op.getImageData() );
output.write( EOL );
output.write( "EI".getBytes("ISO-8859-1") );
output.write( EOL );
}
else
{
output.write( op.getOperation().getBytes("ISO-8859-1") );
output.write( EOL );
}
}
else
{
throw new IOException( "Error:Unknown type in content stream:" + o );
}
}
/**
* This will write out the list of tokens to the stream.
*
* @param tokens The tokens to write to the stream.
* @throws IOException If there is an error writing to the stream.
*/
public void writeTokens( List tokens ) throws IOException
{
writeTokens( tokens, 0, tokens.size() );
}
}