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package org.apache.catalina.valves;


import org.apache.catalina.Request;
import org.apache.catalina.Response;

import javax.servlet.ServletException;
import java.io.IOException;


/**
 * Concrete implementation of RequestFilterValve that filters
 * based on the remote client's host name.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.3 $ $Date: 2005/12/08 01:28:24 $
 */

public final class RemoteHostValve
    extends RequestFilterValve {


    // ----------------------------------------------------- Instance Variables


    /**
     * The descriptive information related to this implementation.
     */
    private static final String info =
        "org.apache.catalina.valves.RemoteHostValve/1.0";


    // ------------------------------------------------------------- Properties


    /**
     * Return descriptive information about this Valve implementation.
     */
    public String getInfo() {

        return (info);

    }


    // --------------------------------------------------------- Public Methods


    /**
     * Extract the desired request property, and pass it (along with the
     * specified request and response objects) to the protected
     * process() method to perform the actual filtering.
     * This method must be implemented by a concrete subclass.
     *
     * @param request The servlet request to be processed
     * @param response The servlet response to be created
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public int invoke(Request request, Response response)
        throws IOException, ServletException {

        return process(request.getRequest().getRemoteHost(),
                request, response);

    }


}