org.pentaho.platform.web.servlet.ContextDiscoveryServlet.java Source code

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Here is the source code for org.pentaho.platform.web.servlet.ContextDiscoveryServlet.java

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/*!
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 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 Lesser General Public License for more details.
 *
 * Copyright (c) 2002-2016 Pentaho Corporation..  All rights reserved.
 */

package org.pentaho.platform.web.servlet;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.platform.util.xml.XMLParserFactoryProducer;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;

/**
 * @deprecated
 * @author Alex Silva
 * 
 */
@Deprecated
public class ContextDiscoveryServlet extends HttpServlet {

    private static final long serialVersionUID = -8747147437664663719L;

    private static final Log logger = LogFactory.getLog(ContextDiscoveryServlet.class);

    private final DocumentBuilderFactory factory;

    private final TransformerFactory tf = TransformerFactory.newInstance();

    public ContextDiscoveryServlet() {
        DocumentBuilderFactory documentBuilderFactory;
        try {
            documentBuilderFactory = XMLParserFactoryProducer.createSecureDocBuilderFactory();
        } catch (ParserConfigurationException e) {
            logger.error(e.getLocalizedMessage());
            documentBuilderFactory = DocumentBuilderFactory.newInstance();
        }
        factory = documentBuilderFactory;
    }

    @Override
    public void doGet(final HttpServletRequest request, final HttpServletResponse response)
            throws ServletException {

        String path = request.getContextPath();

        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.newDocument();
            Element epath = document.createElement("application-context-root"); //$NON-NLS-1$
            epath.setTextContent(path);
            document.appendChild(epath);
            Transformer trans = tf.newTransformer();
            trans.transform(new DOMSource(document), new StreamResult(response.getOutputStream()));
        } catch (ParserConfigurationException e) {
            throw new ServletException(e);
        } catch (TransformerConfigurationException e) {
            throw new ServletException(e);
        } catch (TransformerException e) {
            throw new ServletException(e);
        } catch (IOException e) {
            throw new ServletException(e);
        }
    }

}