Package org.geoserver.wms.map

Source Code of org.geoserver.wms.map.PDFMapResponse

/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
* (c) 2001 - 2013 OpenPlans
* This code is licensed under the GPL 2.0 license, available at the root
* application directory.
*/
package org.geoserver.wms.map;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.geoserver.platform.Operation;
import org.geoserver.platform.ServiceException;
import org.geoserver.wms.DefaultWebMapService;
import org.geoserver.wms.WMS;
import org.geoserver.wms.WMSMapContent;
import org.geoserver.wms.decoration.MapDecorationLayout;
import org.geoserver.wms.map.PDFMapOutputFormat.PDFMap;
import org.geotools.renderer.lite.StreamingRenderer;
import org.springframework.util.Assert;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.FontFactory;
import com.lowagie.text.pdf.DefaultFontMapper;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfGraphics2D;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;
import com.vividsolutions.jts.geom.Envelope;

/**
* Handles a GetMap request that spects a map in PDF format.
*
* @author Pierre-Emmanuel Balageas, ALCER (http://www.alcer.com)
* @author Simone Giannecchini - GeoSolutions
* @author Gabriel Roldan
* @version $Id$
*/
public class PDFMapResponse extends AbstractMapResponse {
    /** A logger for this class. */
    private static final Logger LOGGER = org.geotools.util.logging.Logging
            .getLogger("org.vfny.geoserver.responses.wms.map.pdf");

    /**
     * A kilobyte
     */
    private static final int KB = 1024;

    private WMS wms;

    public PDFMapResponse(WMS wms) {
        super(PDFMap.class, PDFMapOutputFormat.MIME_TYPE);
        this.wms = wms;
    }

    /**
     * Writes the PDF.
     * <p>
     * NOTE: the document seems to actually be created in memory, and being written down to
     * {@code output} once we call {@link Document#close()}. If there's no other way to do so, it'd
     * be better to actually split out the process into produceMap/write?
     * </p>
     *
     * @see org.geoserver.ows.Response#write(java.lang.Object, java.io.OutputStream,
     *      org.geoserver.platform.Operation)
     */
    @Override
    public void write(Object value, OutputStream output, Operation operation) throws IOException,
            ServiceException {

        Assert.isInstanceOf(PDFMap.class, value);
        WMSMapContent mapContent = ((PDFMap) value).getContext();

        final int width = mapContent.getMapWidth();
        final int height = mapContent.getMapHeight();

        if (LOGGER.isLoggable(Level.FINE)) {
            LOGGER.fine("setting up " + width + "x" + height + " image");
        }

        try {
            // step 1: creation of a document-object
            // width of document-object is width*72 inches
            // height of document-object is height*72 inches
            com.lowagie.text.Rectangle pageSize = new com.lowagie.text.Rectangle(width, height);

            Document document = new Document(pageSize);
            document.setMargins(0, 0, 0, 0);

            // step 2: creation of the writer
            PdfWriter writer = PdfWriter.getInstance(document, output);

            // step 3: we open the document
            document.open();

            // step 4: we grab the ContentByte and do some stuff with it

            // we create a fontMapper and read all the fonts in the font
            // directory
            DefaultFontMapper mapper = new DefaultFontMapper();
            FontFactory.registerDirectories();

            // we create a template and a Graphics2D object that corresponds
            // with it
            PdfContentByte cb = writer.getDirectContent();
            PdfTemplate tp = cb.createTemplate(width, height);
            PdfGraphics2D graphic = (PdfGraphics2D) tp.createGraphics(width, height, mapper);

            // we set graphics options
            if (!mapContent.isTransparent()) {
                graphic.setColor(mapContent.getBgColor());
                graphic.fillRect(0, 0, width, height);
            } else {
                if (LOGGER.isLoggable(Level.FINE)) {
                    LOGGER.fine("setting to transparent");
                }

                int type = AlphaComposite.SRC;
                graphic.setComposite(AlphaComposite.getInstance(type));

                Color c = new Color(mapContent.getBgColor().getRed(), mapContent.getBgColor()
                        .getGreen(), mapContent.getBgColor().getBlue(), 0);
                graphic.setBackground(mapContent.getBgColor());
                graphic.setColor(c);
                graphic.fillRect(0, 0, width, height);

                type = AlphaComposite.SRC_OVER;
                graphic.setComposite(AlphaComposite.getInstance(type));
            }

            Rectangle paintArea = new Rectangle(width, height);

            StreamingRenderer renderer = new StreamingRenderer();
            renderer.setMapContent(mapContent);
            // TODO: expose the generalization distance as a param
            // ((StreamingRenderer) renderer).setGeneralizationDistance(0);

            RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
                    RenderingHints.VALUE_ANTIALIAS_ON);
            renderer.setJava2DHints(hints);

            // we already do everything that the optimized data loading does...
            // if we set it to true then it does it all twice...
            java.util.Map rendererParams = new HashMap();
            rendererParams.put("optimizedDataLoadingEnabled", new Boolean(true));
            rendererParams.put("renderingBuffer", new Integer(mapContent.getBuffer()));
            // we need the renderer to draw everything on the batik provided graphics object
            rendererParams.put(StreamingRenderer.OPTIMIZE_FTS_RENDERING_KEY, Boolean.FALSE);
            // render everything in vector form if possible
            rendererParams.put(StreamingRenderer.VECTOR_RENDERING_KEY, Boolean.TRUE);
            if (DefaultWebMapService.isLineWidthOptimizationEnabled()) {
                rendererParams.put(StreamingRenderer.LINE_WIDTH_OPTIMIZATION_KEY, true);
            }
            rendererParams.put(StreamingRenderer.SCALE_COMPUTATION_METHOD_KEY,
                    mapContent.getRendererScaleMethod());

            renderer.setRendererHints(rendererParams);

            Envelope dataArea = mapContent.getRenderingArea();

            // enforce no more than x rendering errors
            int maxErrors = wms.getMaxRenderingErrors();
            MaxErrorEnforcer errorChecker = new MaxErrorEnforcer(renderer, maxErrors);

            // Add a render listener that ignores well known rendering exceptions and reports back
            // non
            // ignorable ones
            final RenderExceptionStrategy nonIgnorableExceptionListener;
            nonIgnorableExceptionListener = new RenderExceptionStrategy(renderer);
            renderer.addRenderListener(nonIgnorableExceptionListener);

            // enforce max memory usage
            int maxMemory = wms.getMaxRequestMemory() * KB;
            PDFMaxSizeEnforcer memoryChecker = new PDFMaxSizeEnforcer(renderer, graphic, maxMemory);

            // render the map
            renderer.paint(graphic, paintArea, mapContent.getRenderingArea(),
                    mapContent.getRenderingTransform());

            // render the watermark
            MapDecorationLayout.Block watermark = RenderedImageMapOutputFormat.getWatermark(wms
                    .getServiceInfo());

            if (watermark != null) {
                MapDecorationLayout layout = new MapDecorationLayout();
                layout.paint(graphic, paintArea, mapContent);
            }

            // check if a non ignorable error occurred
            if (nonIgnorableExceptionListener.exceptionOccurred()) {
                Exception renderError = nonIgnorableExceptionListener.getException();
                throw new ServiceException("Rendering process failed", renderError, "internalError");
            }

            // check if too many errors occurred
            if (errorChecker.exceedsMaxErrors()) {
                throw new ServiceException("More than " + maxErrors
                        + " rendering errors occurred, bailing out",
                        errorChecker.getLastException(), "internalError");
            }

            // check we did not use too much memory
            if (memoryChecker.exceedsMaxSize()) {
                long kbMax = maxMemory / KB;
                throw new ServiceException(
                        "Rendering request used more memory than the maximum allowed:" + kbMax
                                + "KB");
            }

            graphic.dispose();
            cb.addTemplate(tp, 0, 0);

            // step 5: we close the document
            document.close();
            writer.flush();
            writer.close();
        } catch (DocumentException t) {
            throw new ServiceException("Error setting up the PDF", t, "internalError");
        }
    }
}
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