pdfmapproducerfactory.java

电子地图服务器,搭建自己的地图服务

/* 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 java.util.Collections;
import java.util.Map;
import java.util.Set;

import org.vfny.geoserver.global.WMS;
import org.vfny.geoserver.wms.GetMapProducer;
import org.vfny.geoserver.wms.GetMapProducerFactorySpi;

/**
 * This class is used as part of the SPI auto discovery process which enables
 * new format producers to be plugged in.
 * 
 * @author Pierre-Emmanuel Balageas, ALCER (http://www.alcer.com)
 * @author Simone Giannecchini - GeoSolutions
 * @version $Id: PDFMapProducerFactory.java 7467 2007-08-28 22:29:03Z afabiani $
 */
public class PDFMapProducerFactory implements GetMapProducerFactorySpi {
	/** the only MIME type this map producer supports */
	static final String MIME_TYPE = "application/pdf";

	/**
	 * convenient singleton Set to expose the output format this producer
	 * supports
	 */
	private static final Set SUPPORTED_FORMATS = Collections
			.singleton(MIME_TYPE);

	/**
	 * Creates a new PdfMapProducerFactory object.
	 */
	public PDFMapProducerFactory() {
		super();
	}

	/**
	 * get a readable name of the supported MIME type
	 * 
	 * @return DOCUMENT ME!
	 */
	public String getName() {
		return "Portable Document Format (PDF) map producer";
	}

	/**
	 * Returns the Set of output format this producer supports
	 * 
	 * @return Set of output format this producer supports (actually
	 *         "application/pdf")
	 */
	public Set getSupportedFormats() {
		return SUPPORTED_FORMATS;
	}

	/**
	 * PDFMapProducer depends of iText-1.3.6.jar
	 * 
	 * @return <code>true</code> if iText.jar is loaded <code>false</code>
	 *         otherwise
	 */
	public boolean isAvailable() {
		try {
			Class.forName("com.lowagie.text.pdf.PdfTemplate");
			Class.forName("com.lowagie.text.Document");
			Class.forName("com.lowagie.text.FontFactory");
			Class.forName("com.lowagie.text.pdf.DefaultFontMapper");
			Class.forName("com.lowagie.text.pdf.PdfContentByte");
			Class.forName("com.lowagie.text.pdf.PdfTemplate");
			Class.forName("com.lowagie.text.pdf.PdfWriter");

			return true;
		} catch (ClassNotFoundException e) {
			return false;
		}
	}

	/**
	 * Returns wether the map producers created by this factory can create maps
	 * in the passed output format.
	 * 
	 * @param mapFormat
	 *            a MIME type string to check if this producer is able to
	 *            handle.
	 * 
	 * @return <code>true</code> if <code>mapFormat ==
	 *         "application/pdf"</code>,
	 *         <code>false</code> otherwise.
	 */
	public boolean canProduce(String mapFormat) {
		return MIME_TYPE.equals(mapFormat);
	}

	/**
	 * DOCUMENT ME!
	 * 
	 * @param mapFormat
	 *            a MIME type string to check if this producer is able to
	 *            handle.
	 * @param config
	 *            DOCUMENT ME!
	 * 
	 * @return an instance of the PDFMapProducer if mapFormat is supported an
	 *         IllegalArgumentException otherwise
	 * 
	 * @throws IllegalArgumentException
	 *             if mapFormat is not supported
	 */
	public GetMapProducer createMapProducer(String mapFormat, WMS wms)
			throws IllegalArgumentException {
		if (!canProduce(mapFormat)) {
			throw new IllegalArgumentException(mapFormat
					+ " not supported by this map producer");
		}

		return new PDFMapProducer(mapFormat, MIME_TYPE);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.geotools.factory.Factory#getImplementationHints() This just
	 *      returns java.util.Collections.EMPTY_MAP
	 */
	public Map getImplementationHints() {
		return java.util.Collections.EMPTY_MAP;
	}
}