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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.contentstream.operator;
import org.apache.pdfbox.cos.COSDictionary;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* An Operator in a PDF content stream.
*
* @author Ben Litchfield
*/
public final class Operator
{
private final String theOperator;
private byte[] imageData;
private COSDictionary imageParameters;
/** map for singleton operator objects; use {@link ConcurrentHashMap} for better scalability with multiple threads */
private static final ConcurrentMap operators = new ConcurrentHashMap();
/**
* Constructor.
*
* @param aOperator The operator that this object will represent.
* @throws IllegalArgumentException if the operator starts with "/".
*/
private Operator(String aOperator)
{
theOperator = aOperator;
if( aOperator.startsWith( "/" ) )
{
throw new IllegalArgumentException( "Operators are not allowed to start with / '" + aOperator + "'" );
}
}
/**
* This is used to create/cache operators in the system.
*
* @param operator The operator for the system.
*
* @return The operator that matches the operator keyword.
*/
public static Operator getOperator( String operator )
{
Operator operation;
if (operator.equals(OperatorName.BEGIN_INLINE_IMAGE_DATA)
|| OperatorName.BEGIN_INLINE_IMAGE.equals(operator))
{
//we can't cache the ID operators.
operation = new Operator( operator );
}
else
{
operation = operators.get( operator );
if( operation == null )
{
// another thread may has already added an operator of this kind
// make sure that we get the same operator
operation = operators.putIfAbsent( operator, new Operator( operator ) );
if ( operation == null )
{
operation = operators.get( operator );
}
}
}
return operation;
}
/**
* This will get the name of the operator.
*
* @return The string representation of the operation.
*/
public String getName()
{
return theOperator;
}
/**
* This will print a string rep of this class.
*
* @return A string rep of this class.
*/
@Override
public String toString()
{
return "PDFOperator{" + theOperator + "}";
}
/**
* This is the special case for the ID operator where there are just random
* bytes inlined the stream.
*
* @return Value of property imageData.
*/
public byte[] getImageData()
{
return this.imageData;
}
/**
* This will set the image data, this is only used for the ID operator.
*
* @param imageDataArray New value of property imageData.
*/
public void setImageData(byte[] imageDataArray)
{
imageData = imageDataArray;
}
/**
* This will get the image parameters, this is only valid for BI operators.
*
* @return The image parameters.
*/
public COSDictionary getImageParameters()
{
return imageParameters;
}
/**
* This will set the image parameters, this is only valid for BI operators.
*
* @param params The image parameters.
*/
public void setImageParameters( COSDictionary params)
{
imageParameters = params;
}
}