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package org.apache.catalina;

import javax.servlet.http.Cookie;
import java.io.IOException;
import java.util.Collection;

/**
 * An HttpResponse is the Catalina-internal facade for an
 * HttpServletResponse that is to be produced,
 * based on the processing of a corresponding HttpRequest.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.2 $ $Date: 2005/12/08 01:27:16 $
 */

public interface HttpResponse
    extends Response {


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


    /**
     * Return the value for the specified header, or null if this
     * header has not been set.  If more than one value was added for this
     * name, only the first is returned; use {@link #getHeaders(String)} to
     * retrieve all of them.
     *
     * @param name Header name to look up
     */
    public String getHeader(String name);


    /**
     * @return a (possibly empty) Collection of the names
     * of the headers of this response
     */
    public Collection getHeaderNames();


    /**
     * @param name the name of the response header whose values to return
     *
     * @return a (possibly empty) Collection of the values
     * of the response header with the given name
     */
    public Collection getHeaders(String name);


    /**
     * Special method for adding a session cookie as we should be overriding 
     * any previous 
     * @param cookie
     */
    public void addSessionCookieInternal(final Cookie cookie);


    /**
     * Return the error message that was set with sendError()
     * for this Response.
     */
    public String getMessage();


    /**
     * Return the HTTP status code associated with this Response.
     */
    public int getStatus();


    /**
     * Reset this response, and specify the values for the HTTP status code
     * and corresponding message.
     *
     * @exception IllegalStateException if this response has already been
     *  committed
     */
    public void reset(int status, String message);


    /**
     * Send an acknowledgment of a request.   An acknowledgment in this
     * case is simply an HTTP response status line, i.e.
     * HTTP/1.1 [STATUS] [REASON-PHRASE].
     *
     * @exception java.io.IOException if an input/output error occurs
     */
    public void sendAcknowledgement() throws IOException;
}