package org.webslinger.servlet;

 import java.io.Serializable;

 import java.util.Date;

 import java.util.Enumeration;

 import java.security.Principal;

 import javax.servlet.http.Cookie;

 import javax.servlet.http.HttpSession;

 public interface HttpHeaders extends Serializable {

     void addDateHeader(String name, long date);

     void addHeader(String name, String value);

     void addIntHeader(String name, int value);

     boolean containsHeader(String name);

     long getDateHeader(String name);

     String getHeader(String name);

     Enumeration<String> getHeaderNames();

     Enumeration<String> getHeaders(String name);

     int getIntHeader(String name);

     void setDateHeader(String name, long date);

     void setHeader(String name, String value);

     void setIntHeader(String name, int value);

     public static final HttpHeaders EMPTY_HEADERS = new HttpHeaders() {

         public void addDateHeader(String name, long date) {

         }

         public void addHeader(String name, String value) {

         }

         public void addIntHeader(String name, int value) {

         }

         public boolean containsHeader(String name) {

             return false;

         }

         public long getDateHeader(String name) {

             return -1;

         }

         public String getHeader(String name) {

             return null;

         }

         public Enumeration<String> getHeaderNames() {

             return null;

         }

         public Enumeration<String> getHeaders(String name) {

             return null;

         }

         public int getIntHeader(String name) {

             return -1;

         }

         public void setDateHeader(String name, long date) {

         }

         public void setHeader(String name, String value) {

         }

         public void setIntHeader(String name, int value) {

         }

     };

 }