/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
/*
 * Copyright 2003 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */


package at.gv.egovernment.moa.id.util;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/**
 * @author rschamberger
 *  
 */
/**
 * A Filter class wich uses the InOrderServletRequestWrapper to provide servlets a more precise
 * implementation of the getParameter* family. This implementation cares about the order of the parameters
 * from Query String and HTTP POST Body. Use this as Filter class for Servlets which such needs.
 * 
 * @author Rudolf Schamberger
 * @version $Id$
 */
public class ParameterInOrderFilter implements Filter
{

  /**
   * filterConfig
   */
  private FilterConfig filterConfig;

  /**
   * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
   */
  public final void init(final FilterConfig config)
  {
    this.filterConfig = config;
  }

  /**
   * @see javax.servlet.Filter#destroy()
   */
  public final void destroy()
  {
  };

  /**
   * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse,
   *      javax.servlet.FilterChain)
   */
  public final void doFilter(final ServletRequest request, final ServletResponse response,
    final FilterChain chain) throws IOException, ServletException
  {
    InOrderServletRequestWrapper sRequ = new InOrderServletRequestWrapper((HttpServletRequest) request,
      filterConfig.getServletContext());
    //parse the Query (and Body) parameters
    sRequ.parseParameters((HttpServletRequest) request);
    //process the rest of filter chain
    chain.doFilter(sRequ, response);
  }
}