Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.remoteclient.ogc.request;

import java.io.File;

import java.io.IOException;

import java.net.ConnectException;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.UnknownHostException;

import org.gvsig.compat.CompatLocator;

import org.gvsig.compat.lang.StringUtils;

import org.gvsig.compat.net.ICancellable;

import org.gvsig.remoteclient.RemoteClientStatus;

import org.gvsig.remoteclient.ogc.OGCClientOperation;

import org.gvsig.remoteclient.ogc.OGCProtocolHandler;

import org.gvsig.remoteclient.utils.Utilities;

import org.gvsig.remoteclient.wfs.WFSOperation;

public abstract class OGCRequest {

        protected RemoteClientStatus status = null;

        protected OGCProtocolHandler protocolHandler = null;

        protected boolean isDeleted = false;

        protected static final String XMLTAG_STARTCHARACTER = "<";

        protected static final String XMLTAG_FINISHCHARACTER = "</";

        protected static final String XMLTAG_ENDCHARACTER = ">";

        private static final StringUtils stringUtils = CompatLocator.getStringUtils();

        public OGCRequest(RemoteClientStatus status, OGCProtocolHandler protocolHandler) {

                super();

                this.status = status;

                this.protocolHandler = protocolHandler;

        }        

        /**

         * Send a request to the server.

         * @return

         * The server reply

         * @throws IOException 

         * @throws UnknownHostException 

         * @throws ConnectException 

         */

        public File sendRequest(ICancellable cancel) throws ConnectException, UnknownHostException, IOException{

                //if the status is null is because is a GetCapabilities operation

                if (status != null){

                        if (status.getProtocol() != OGCClientOperation.PROTOCOL_UNDEFINED){

                                if (status.getProtocol() == OGCClientOperation.PROTOCOL_GET){

                                        String onlineResource = protocolHandler.getHost();

                                        String symbol = getSymbol(onlineResource);

                                        onlineResource = onlineResource + symbol;

                                        return sendHttpGetRequest(onlineResource, cancel);

                                }else{

                                        String onlineResource = protocolHandler.getHost();

                                        return sendHttpPostRequest(onlineResource);

                                }

                        }

                }

                //if exists an online resource for the GET operation

                String onlineResource = protocolHandler.getServiceInformation().getOnlineResource(getOperationName(), WFSOperation.PROTOCOL_GET);

                if (onlineResource != null){

                        String symbol = getSymbol(onlineResource);

                        onlineResource = onlineResource + symbol;

                        return sendHttpGetRequest(onlineResource, cancel);

                }

                //if exists an online resource for the POST operation

                onlineResource =  protocolHandler.getServiceInformation().getOnlineResource(getOperationName(), WFSOperation.PROTOCOL_POST);

                if (onlineResource != null){

                        return sendHttpPostRequest(onlineResource);

                }

                //If the online resource doesn't exist, it tries with the server URL and GET

                onlineResource = protocolHandler.getHost();

                String symbol = getSymbol(onlineResource);

                onlineResource = onlineResource + symbol;

                return sendHttpGetRequest(onlineResource, cancel);

        }

        protected abstract String getHttpGetRequest(String onlineResource);

        protected abstract String getHttpPostRequest(String onlineResource);

        protected abstract String getTempFilePrefix();

        protected abstract String getOperationName();

        protected abstract String getSchemaLocation();        

        /**

         * @return the URL used in the HTTP get operation

         * @throws MalformedURLException

         */

        public URL getURL() throws MalformedURLException{

                String onlineResource = protocolHandler.getServiceInformation().getOnlineResource(getOperationName(), WFSOperation.PROTOCOL_GET);

                if (onlineResource != null){

                        String symbol = getSymbol(onlineResource);

                        onlineResource = onlineResource + symbol;

                        return new URL(getHttpGetRequest(onlineResource));

                }

                //If the online resource doesn't exist, it tries with the server URL and GET

                onlineResource = protocolHandler.getHost();

                String symbol = getSymbol(onlineResource);

                onlineResource = onlineResource + symbol;

                return new URL(getHttpGetRequest(onlineResource));

        }

        /**

         * Send a Http request using the get protocol

         * @param onlineResource

         * @return

         * @throws ConnectException

         * @throws UnknownHostException

         * @throws IOException

         */

        private File sendHttpGetRequest(String onlineResource, ICancellable cancel) throws ConnectException, UnknownHostException, IOException{

                URL url = new URL(stringUtils.replaceAll(getHttpGetRequest(onlineResource), " ", "%20"));

                if (isDeleted()){

                        Utilities.removeURL(url);

                }

                return Utilities.downloadFile(url, getTempFilePrefix(), cancel);                

        }

        /**

         * Send a Http request using the post protocol

         * @param onlineResource

         * @return

         * @throws ConnectException

         * @throws UnknownHostException

         * @throws IOException

         */

        private File sendHttpPostRequest(String onlineResource) throws ConnectException, UnknownHostException, IOException{

                URL url = new URL(onlineResource);

                String data = getHttpPostRequest(onlineResource);

                if (isDeleted()){

                        Utilities.removeURL(url+data);

                }

                return Utilities.downloadFile(url, data, getTempFilePrefix(), null);                

        }

        /**

         * Just for not repeat code. Gets the correct separator according 

         * to the server URL

         * @param h

         * @return

         */

        protected static String getSymbol(String h) {

                String symbol;

                if (h.indexOf("?")==-1) 

                        symbol = "?";

                else if (h.indexOf("?")!=h.length()-1)

                        symbol = "&";

                else

                        symbol = "";

                return symbol;

        }

        public boolean isDeleted() {

                return isDeleted;

        }

        public void setDeleted(boolean isDeleted) {

                this.isDeleted = isDeleted;

        }

        protected String createXMLStartTag(String tagName){

            return XMLTAG_STARTCHARACTER + tagName + XMLTAG_ENDCHARACTER;

        }

   protected String createXMLEndtTag(String tagName){

        return XMLTAG_FINISHCHARACTER + tagName + XMLTAG_ENDCHARACTER;

    }

}