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* Copyright (c) 2005, www.pdfbox.org
* All rights reserved.
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* modification, are permitted provided that the following conditions are met:
*
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* this list of conditions and the following disclaimer.
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package org.pdfbox.util.operator;
import org.pdfbox.cos.COSName;
import org.pdfbox.cos.COSStream;
import org.pdfbox.pdmodel.PDPage;
import org.pdfbox.pdmodel.PDResources;
import org.pdfbox.pdmodel.graphics.xobject.PDXObject;
import org.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
import org.pdfbox.util.PDFOperator;
import java.io.IOException;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.Map;
/**
* Invoke named XObject.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @author Mario Ivankovits
*
* @version $Revision: 1.8 $
*/
public class Invoke extends OperatorProcessor
{
private Set inProcess = new TreeSet();
/**
* 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
{
COSName name = (COSName) arguments.get( 0 );
if (inProcess.contains(name))
{
// avoid recursive loop
return;
}
inProcess.add(name);
try
{
//PDResources res = context.getResources();
Map xobjects = context.getXObjects();
PDXObject xobject = (PDXObject) xobjects.get(name.getName());
if(xobject instanceof PDXObjectForm)
{
PDXObjectForm form = (PDXObjectForm)xobject;
COSStream invoke = (COSStream)form.getCOSObject();
PDResources pdResources = form.getResources();
PDPage page = context.getCurrentPage();
if(pdResources == null)
{
pdResources = page.findResources();
}
getContext().processSubStream( page, pdResources, invoke );
}
}
finally
{
inProcess.remove(name);
}
}
}