// HttpServletRequest - this interface represents an HTTP request
//
// API based on documentation from JavaSoft.
//
// Copyright (C) 1996,1998 by Jef Poskanzer <jef@acme.com>. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Visit the ACME Labs Java page for up-to-date versions of this and other
// fine Java utilities: http://www.acme.com/java/

package Acme.Serve.servlet.http;

import java.io.*;
import java.util.*;
import Acme.Serve.servlet.*;

/// This interface represents an HTTP request.
// <P>
// This is taken from JavaSoft's Servlet API documentation.
// <P>
// <A HREF="/resources/classes/Acme/Serve/servlet/http/HttpServletRequest.java">Fetch the software.</A><BR>
// <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
// <P>
// @see Acme.Serve.servlet.Servlet

public interface HttpServletRequest extends ServletRequest
    {

    /// Gets the array of cookies found in this request.
    public Cookie[] getCookies();

    /// Returns the method with which the request was made. This can be "GET",
    // "HEAD", "POST", or an extension method.
    // Same as the CGI variable REQUEST_METHOD.
    public String getMethod();

    /// Returns the full request URI.
    public String getRequestURI();

    /// Returns the part of the request URI that referred to the servlet being
    // invoked.
    // Analogous to the CGI variable SCRIPT_NAME.
    public String getServletPath();

    /// Returns optional extra path information following the servlet path, but
    // immediately preceding the query string.  Returns null if not specified.
    // Same as the CGI variable PATH_INFO.
    public String getPathInfo();

    /// Returns extra path information translated to a real path.  Returns
    // null if no extra path information was specified.
    // Same as the CGI variable PATH_TRANSLATED.
    public String getPathTranslated();

    /// Returns the query string part of the servlet URI, or null if none.
    // Same as the CGI variable QUERY_STRING.
    public String getQueryString();

    /// Returns the name of the user making this request, or null if not known.
    // Same as the CGI variable REMOTE_USER.
    public String getRemoteUser();

    /// Returns the authentication scheme of the request, or null if none.
    // Same as the CGI variable AUTH_TYPE.
    public String getAuthType();

    /// Returns the value of a header field, or null if not known.
    // Same as the information passed in the CGI variabled HTTP_*.
    // @param name the header field name
    public String getHeader( String name );

    /// Returns the value of an integer header field.
    // @param name the header field name
    // @param def the integer value to return if header not found or invalid
    public int getIntHeader( String name, int def );

    /// Returns the value of a long header field.
    // @param name the header field name
    // @param def the long value to return if header not found or invalid
    public long getLongHeader( String name, long def );

    /// Returns the value of a date header field.
    // @param name the header field name
    // @param def the date value to return if header not found or invalid
    public long getDateHeader( String name, long def );

    /// Returns an Enumeration of the header names.
    public Enumeration getHeaderNames();

    // Session stuff.  Not implemented, but the API is here for compatibility.

    /// Gets the current valid session associated with this request, if
    // create is false or, if necessary, creates a new session for the
    // request, if create is true.
    // <P>
    // Note: to ensure the session is properly maintained, the servlet
    // developer must call this method (at least once) before any output
    // is written to the response.
    // <P>
    // Additionally, application-writers need to be aware that newly
    // created sessions (that is, sessions for which HttpSession.isNew
    // returns true) do not have any application-specific state.
    public HttpSession getSession( boolean create );

    /// Gets the session id specified with this request. This may differ
    // from the actual session id.  For example, if the request specified
    // an id for an invalid session, then this will get a new session with
    // a new id.
    public String getRequestedSessionId();

    /// Checks whether this request is associated with a session that is
    // valid in the current session context.  If it is not valid, the
    // requested session will never be returned from the getSession
    // method.
    public boolean isRequestedSessionIdValid();

    /// Checks whether the session id specified by this request came in as
    // a cookie.  (The requested session may not be one returned by the
    // getSession method.)
    public boolean isRequestedSessionIdFromCookie();

    /// Checks whether the session id specified by this request came in as
    // part of the URL.  (The requested session may not be the one returned
    // by the getSession method.)
    public boolean isRequestedSessionIdFromUrl();

    }