org.apache.pdfbox.pdfwriter.ContentStreamWriter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of pdfbox Show documentation
Show all versions of pdfbox Show documentation
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.List;
import java.util.Map;
import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.contentstream.operator.OperatorName;
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.Charsets;
/**
* A class that will take a list of tokens and write out a stream with them.
*
* @author Ben Litchfield
*/
public class ContentStreamWriter
{
private final 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;
}
/**
* Writes a single operand token.
*
* @param base The operand to write to the stream.
* @throws IOException If there is an error writing to the stream.
*/
public void writeToken(COSBase base) throws IOException
{
writeObject(base);
}
/**
* Writes a single operator token.
*
* @param op The operator to write to the stream.
* @throws IOException If there is an error writing to the stream.
*/
public void writeToken(Operator op) throws IOException
{
writeObject(op);
}
/**
* Writes a series of tokens followed by a new line.
*
* @param tokens The tokens to write to the stream.
* @throws IOException If there is an error writing to the stream.
*/
public void writeTokens(Object... tokens) throws IOException
{
for (Object token : tokens)
{
writeObject(token);
}
output.write("\n".getBytes(Charsets.US_ASCII));
}
/**
* 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
{
for (Object token : tokens)
{
writeObject(token);
}
}
private void writeObject( Object o ) throws IOException
{
if( o instanceof COSString )
{
COSWriter.writeString((COSString)o, output);
output.write( SPACE );
}
else if( o instanceof COSFloat )
{
((COSFloat)o).writePDF( output );
output.write( SPACE );
}
else if( o instanceof COSInteger )
{
((COSInteger)o).writePDF( output );
output.write( SPACE );
}
else if( o instanceof COSBoolean )
{
((COSBoolean)o).writePDF( output );
output.write( SPACE );
}
else if( o instanceof COSName )
{
((COSName)o).writePDF( output );
output.write( SPACE );
}
else if( o instanceof COSArray )
{
COSArray array = (COSArray)o;
output.write(COSWriter.ARRAY_OPEN);
for( int i=0; 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 Operator)
{
Operator op = (Operator)o;
if (op.getName().equals(OperatorName.BEGIN_INLINE_IMAGE))
{
output.write(OperatorName.BEGIN_INLINE_IMAGE.getBytes(Charsets.ISO_8859_1));
COSDictionary dic = op.getImageParameters();
for( COSName key : dic.keySet() )
{
Object value = dic.getDictionaryObject( key );
key.writePDF( output );
output.write( SPACE );
writeObject( value );
output.write( EOL );
}
output.write(OperatorName.BEGIN_INLINE_IMAGE_DATA.getBytes(Charsets.ISO_8859_1));
output.write( EOL );
output.write( op.getImageData() );
output.write( EOL );
output.write(OperatorName.END_INLINE_IMAGE.getBytes(Charsets.ISO_8859_1));
output.write( EOL );
}
else
{
output.write( op.getName().getBytes(Charsets.ISO_8859_1) );
output.write( EOL );
}
}
else
{
throw new IOException( "Error:Unknown type in content stream:" + o );
}
}
}