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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.util.operator;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
import org.apache.pdfbox.util.Matrix;
import org.apache.pdfbox.util.PDFMarkedContentExtractor;
import org.apache.pdfbox.util.PDFOperator;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/**
* Invoke named XObject.
*
* @author Ben Litchfield
* @author Mario Ivankovits
*
* @version $Revision: 1.9 $
*/
public class Invoke extends OperatorProcessor
{
/**
* process : Do - Invoke a named xobject.
*
* @param operator The operator that is being executed.
* @param arguments List
*
* @throws IOException If there is an error processing this operator.
*/
public void process(PDFOperator operator, List arguments) throws IOException
{
if (arguments.size() < 1)
{
return;
}
COSBase base0 = arguments.get(0);
if (!(base0 instanceof COSName))
{
return;
}
COSName name = (COSName) base0;
Map xobjects = context.getXObjects();
PDXObject xobject = (PDXObject) xobjects.get(name.getName());
if (context instanceof PDFMarkedContentExtractor)
{
((PDFMarkedContentExtractor) context).xobject(xobject);
}
if(xobject instanceof PDXObjectForm)
{
PDXObjectForm form = (PDXObjectForm)xobject;
COSStream formContentstream = form.getCOSStream();
// if there is an optional form matrix, we have to map the form space to the user space
Matrix matrix = form.getMatrix();
if (matrix != null)
{
Matrix xobjectCTM = matrix.multiply( context.getGraphicsState().getCurrentTransformationMatrix());
context.getGraphicsState().setCurrentTransformationMatrix(xobjectCTM);
}
// find some optional resources, instead of using the current resources
PDResources pdResources = form.getResources();
context.processSubStream( context.getCurrentPage(), pdResources, formContentstream );
}
}
}