es.gva.cit.catalog.protocols.HTTPGetProtocol.java Source code

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Here is the source code for es.gva.cit.catalog.protocols.HTTPGetProtocol.java

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/* gvSIG. Sistema de Informacin Geogrfica de la Generalitat Valenciana
 *
 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
 *
 * 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 2
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.
 *
 * For more information, contact:
 *
 *  Generalitat Valenciana
 *   Conselleria d'Infraestructures i Transport
 *   Av. Blasco Ibez, 50
 *   46010 VALENCIA
 *   SPAIN
 *
 *      +34 963862235
 *   gvsig@gva.es
 *      www.gvsig.gva.es
 *
 *    or
 *
 *   IVER T.I. S.A
 *   Salamanca 50
 *   46005 Valencia
 *   Spain
 *
 *   +34 963163400
 *   dac@iver.es
 */
package es.gva.cit.catalog.protocols;

import java.io.File;
import java.net.URL;
import java.util.Collection;

import org.apache.commons.httpclient.NameValuePair;
import org.gvsig.remoteClient.utils.Utilities;

import es.gva.cit.catalog.metadataxml.XMLTree;

/**
 * 
 * 
 * 
 * @author Jorge Piera Llodra (piera_jor@gva.es)
 */
public class HTTPGetProtocol implements IProtocols {

    /**
     * 
     * 
     * 
     * @return
     * @param url
     * @param object
     * @param firstRecord
     */
    public Collection doQuery(URL url, Object object, int firstRecord) {
        NameValuePair[] parameters = (NameValuePair[]) object;
        File file = null;

        String sUrl = "http://" + url.getHost() + ":" + url.getPort() + url.getPath();
        sUrl = sUrl + createURLParams(parameters);

        try {
            file = Utilities.downloadFile(new URL(sUrl), "catalog-", null);

        } catch (Exception e) {
            return null;
        }

        Collection col = new java.util.ArrayList();
        col.add(XMLTree.xmlToTree(file));
        return col;
    }

    /**
     * Create and string for a list of params
     * 
     * @param params
     * @return
     */
    private String createURLParams(NameValuePair[] params) {
        StringBuffer buffer = new StringBuffer();
        for (int i = 0; i < params.length; i++) {
            if (i == 0) {
                buffer.append("?");
            } else {
                buffer.append("&");
            }
            buffer.append(params[i].getName());
            buffer.append("=");
            buffer.append(params[i].getValue());
        }
        return buffer.toString();
    }

}