/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.vfny.geoserver.wms.responses.map.pdf;
import org.geotools.renderer.GTRenderer;
import org.geotools.renderer.RenderListener;
import org.opengis.feature.simple.SimpleFeature;
import com.lowagie.text.pdf.ByteBuffer;
import com.lowagie.text.pdf.PdfGraphics2D;
/**
* Attaches itself to the renderer and ensures no more than maxSize bytes are used to
* store the PDF in memory, and stops the renderer in case that happens.
* @author Andrea Aime - OpenGeo
*/
public class PDFMaxSizeEnforcer {
long maxSize;
ByteBuffer pdfBytes;
/**
* Builds a new max errors enforcer. If maxErrors is not positive the enforcer will do nothing
*
* @param renderer
* @param maxErrors
*/
public PDFMaxSizeEnforcer(final GTRenderer renderer, final PdfGraphics2D graphics, final int maxSize) {
this.maxSize = maxSize;
this.pdfBytes = graphics.getContent().getInternalBuffer();
if (maxSize > 0) {
renderer.addRenderListener(new RenderListener() {
public void featureRenderer(SimpleFeature feature) {
if(pdfBytes.size() > maxSize) {
renderer.stopRendering();
}
}
public void errorOccurred(Exception e) {
}
});
}
}
/**
* True if the memory used by the PDF buffer exceeds the max memory settings
* @return
*/
public boolean exceedsMaxSize() {
return maxSize > 0 && pdfBytes.size() > maxSize;
}
/**
* Returns the amount of memory currently used by the
* @return
*/
public long memoryUsed() {
return pdfBytes.size();
}
}