wcscapstransformer.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.responses;

import org.geoserver.ows.util.RequestUtils;
import org.geotools.geometry.GeneralEnvelope;
import org.geotools.xml.transform.TransformerBase;
import org.geotools.xml.transform.Translator;
import org.vfny.geoserver.global.CoverageInfo;
import org.vfny.geoserver.global.CoverageInfoLabelComparator;
import org.vfny.geoserver.global.MetaDataLink;
import org.vfny.geoserver.global.Service;
import org.vfny.geoserver.global.WCS;
import org.vfny.geoserver.util.requests.CapabilitiesRequest;
import org.vfny.geoserver.wcs.requests.WCSRequest;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.logging.Logger;


/**
 * DOCUMENT ME!
 *
 * @author $Author: Alessio Fabiani ([e-mail]) $ (last
 *         modification)
 * @author $Author: Simone Giannecchini ([e-mail]) $ (last
 *         modification)
 */
public class WCSCapsTransformer extends TransformerBase {
    /** DOCUMENT ME! */
    private static final Logger LOGGER = org.geotools.util.logging.Logging.getLogger(WCSCapsTransformer.class.getPackage()
                                                                                  .getName());
    protected static final String WCS_URI = "http://www.opengis.net/wcs";

    /** DOCUMENT ME! */
    protected static final String WFS_URI = "http://www.opengis.net/wcs";

    /** DOCUMENT ME! */
    protected static final String CUR_VERSION = "1.0.0";

    /** DOCUMENT ME! */
    protected static final String XSI_PREFIX = "xsi";

    /** DOCUMENT ME! */
    protected static final String XSI_URI = "http://www.w3.org/2001/XMLSchema-instance";

    /**
     * DOCUMENT ME!
     *
     * @uml.property name="request"
     * @uml.associationEnd multiplicity="(0 1)"
     */
    protected WCSRequest request;

    /**
     * Creates a new WFSCapsTransformer object.
     */
    public WCSCapsTransformer() {
        super();
        setNamespaceDeclarationEnabled(false);
    }

    /**
     * DOCUMENT ME!
     *
     * @param handler
     *            DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public Translator createTranslator(ContentHandler handler) {
        return new WCSCapsTranslator(handler);
    }

    /**
     * DOCUMENT ME!
     *
     * @author Gabriel Roldan, Axios Engineering
     * @version $Id
     */
    private static class WCSCapsTranslator extends TranslatorSupport {
        /**
         * DOCUMENT ME!
         *
         * @uml.property name="request"
         * @uml.associationEnd multiplicity="(0 1)"
         */
        private CapabilitiesRequest request;

        /**
         * Creates a new WFSCapsTranslator object.
         *
         * @param handler
         *            DOCUMENT ME!
         */
        public WCSCapsTranslator(ContentHandler handler) {
            super(handler, null, null);
        }

        /**
         * Encode the object.
         *
         * @param o
         *            The Object to encode.
         *
         * @throws IllegalArgumentException
         *             if the Object is not encodeable.
         */
        public void encode(Object o) throws IllegalArgumentException {
            if (!(o instanceof CapabilitiesRequest)) {
                throw new IllegalArgumentException(new StringBuffer("Not a CapabilitiesRequest: ").append(
                        o).toString());
            }

            this.request = (CapabilitiesRequest) o;

            final AttributesImpl attributes = new AttributesImpl();
            attributes.addAttribute("", "version", "version", "", CUR_VERSION);
            attributes.addAttribute("", "xmlns", "xmlns", "", WCS_URI);

            attributes.addAttribute("", "xmlns:xlink", "xmlns:xlink", "",
                "http://www.w3.org/1999/xlink");
            attributes.addAttribute("", "xmlns:ogc", "xmlns:ogc", "", "http://www.opengis.net/ogc");
            attributes.addAttribute("", "xmlns:gml", "xmlns:gml", "", "http://www.opengis.net/gml");

            final String prefixDef = new StringBuffer("xmlns:").append(XSI_PREFIX).toString();
            attributes.addAttribute("", prefixDef, prefixDef, "", XSI_URI);

            final String locationAtt = new StringBuffer(XSI_PREFIX).append(":schemaLocation")
                                                                   .toString();

            final String locationDef = WCS_URI + " "
                + RequestUtils.schemaBaseURL(request.getHttpServletRequest())
                + "wcs/1.0.0/wcsCapabilities.xsd";

            attributes.addAttribute("", locationAtt, locationAtt, "", locationDef);
            start("WCS_Capabilities", attributes);

            handleService();
            handleCapabilities();

            end("WCS_Capabilities");
        }

        /**
         * Handles the service section of the capabilities document.
         *
         * @param config
         *            The OGC service to transform.
         *
         * @throws SAXException
         *             For any errors.
         */
        private void handleService() {
            final WCS wcs = (WCS) request.getServiceRef().getServiceRef();
            AttributesImpl attributes = new AttributesImpl();
            attributes.addAttribute("", "version", "version", "", CUR_VERSION);
            start("Service", attributes);
            handleMetadataLink(wcs.getMetadataLink());
            element("description", wcs.getAbstract());
            element("name", wcs.getName());
            element("label", wcs.getTitle());
            handleKeywords(wcs.getKeywords());
            handleContact(wcs);

            String fees = wcs.getFees();

            if ((fees == null) || "".equals(fees)) {
                fees = "NONE";
            }

            element("fees", fees);

            String accessConstraints = wcs.getAccessConstraints();

            if ((accessConstraints == null) || "".equals(accessConstraints)) {
                accessConstraints = "NONE";
            }

            element("accessConstraints", accessConstraints);
            end("Service");
        }

        /**
         * DOCUMENT ME!
         *
         * @param serviceConfig
         *            DOCUMENT ME!
         *
         * @throws SAXException
         *             DOCUMENT ME!
         */
        private void handleCapabilities() {
            final WCS wcs = (WCS) request.getServiceRef().getServiceRef();
            start("Capability");
            handleRequest(wcs);
            handleExceptions(wcs);
            handleVendorSpecifics(wcs);
            end("Capability");

            handleContentMetadata(wcs);
        }

        /**
         * Handles the request portion of the document, printing out the
         * capabilities and where to bind to them.
         *
         * @param config
         *            The global wms.
         *
         * @throws SAXException
         *             For any problems.
         */
        private void handleRequest(WCS config) {
            start("Request");
            handleCapability(config, "GetCapabilities");
            handleCapability(config, "DescribeCoverage");
            handleCapability(config, "GetCoverage");
            end("Request");
        }

        private void handleCapability(WCS config, String capabilityName) {
            AttributesImpl attributes = new AttributesImpl();
            start(capabilityName);

            start("DCPType");
            start("HTTP");

            String url = "";
            String baseUrl = request.getBaseUrl() + "wcs";

            if (request.isDispatchedRequest()) {
                url = new StringBuffer(baseUrl).append("?").toString();
            } else {
                url = new StringBuffer(baseUrl).append("/").append(capabilityName).append("?")
                                               .toString();
            }

            attributes.addAttribute("", "xlink:href", "xlink:href", "", url);

            start("Get");
            start("OnlineResource", attributes);
            end("OnlineResource");
            end("Get");
            end("HTTP");
            end("DCPType");

            attributes = new AttributesImpl();

            if (request.isDispatchedRequest()) {
                url = baseUrl;
            } else {
                url = new StringBuffer(baseUrl).append("/").append(capabilityName).toString();
            }

            attributes.addAttribute("", "xlink:href", "xlink:href", "", url);

            start("DCPType");
            start("HTTP");
            start("Post");
            start("OnlineResource", attributes);
            end("OnlineResource");
            end("Post");
            end("HTTP");
            end("DCPType");
            end(capabilityName);
        }