capabilitiesxmlreader.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.wcs.requests.readers;

import org.vfny.geoserver.Request;
import org.vfny.geoserver.util.requests.CapabilitiesHandler;
import org.vfny.geoserver.util.requests.readers.XmlRequestReader;
import org.vfny.geoserver.wcs.WcsException;
import org.vfny.geoserver.wcs.requests.WCSCapabilitiesRequest;
import org.vfny.geoserver.wcs.servlets.WCService;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.ParserAdapter;
import java.io.IOException;
import java.io.Reader;
import javax.servlet.http.HttpServletRequest;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;


/**
 * reads a WCS GetCapabilities request from an XML stream
 *
 * @author $Author: Alessio Fabiani ([e-mail]) $ (last modification)
 * @author $Author: Simone Giannecchini ([e-mail]) $ (last modification)
 * @version $Id: CapabilitiesXmlReader.java 6326 2007-03-15 18:36:40Z jdeolive $
 */
public class CapabilitiesXmlReader extends XmlRequestReader {
    /**
     * Constructs a new reader.
     *
     * @param service The WFS service handling the request.
     */
    public CapabilitiesXmlReader(WCService service) {
        super(service);
    }

    /**
     * Reads the Capabilities XML request into a CapabilitiesRequest object.
     *
     * @param reader The plain POST text from the client.
     *
     * @return The read CapabilitiesRequest object.
     *
     * @throws WmsException For any problems reading the request
     */
    public Request read(Reader reader, HttpServletRequest req)
        throws WcsException {
        InputSource requestSource = new InputSource(reader);

        // instantiante parsers and content handlers
        CapabilitiesHandler currentRequest = new CapabilitiesHandler(new WCSCapabilitiesRequest(
                    getServiceRef()));

        // read in XML file and parse to content handler
        try {
            SAXParserFactory factory = SAXParserFactory.newInstance();
            SAXParser parser = factory.newSAXParser();
            ParserAdapter adapter = new ParserAdapter(parser.getParser());
            adapter.setContentHandler(currentRequest);
            adapter.parse(requestSource);
            LOGGER.fine("just parsed: " + requestSource);
        } catch (SAXException e) {
            throw new WcsException(e, "XML capabilities request parsing error", getClass().getName());
        } catch (IOException e) {
            throw new WcsException(e, "XML capabilities request input error", getClass().getName());
        } catch (ParserConfigurationException e) {
            throw new WcsException(e, "Some sort of issue creating parser", getClass().getName());
        }

        Request r = currentRequest.getRequest(req);

        if (r.getService() != null) {
            final String service = r.getService();

            if (!service.trim().toUpperCase().startsWith("WCS")) {
                throw new WcsException("SERVICE parameter is wrong.");
            }
        } else {
            throw new WcsException("SERVICE parameter is mandatory.");
        }

        if (r.getVersion() != null) {
            final String version = r.getVersion();

            if (!version.equals("1.0.0")) {
                throw new WcsException("VERSION parameter is wrong.");
            }
        } else {
            throw new WcsException("VERSION parameter is mandatory.");
        }

        /*if (r.getRequest() != null) {
                final String requestType = r.getRequest();
                if (!requestType.equalsIgnoreCase("GetCapabilities") ) {
                        throw new WcsException("REQUEST parameter is wrong.");
                }
        } else {
                throw new WcsException("REQUEST parameter is mandatory.");
        }*/
        return r;
    }
}