cookiecommand.java

来自「很棒的web服务器源代码」· Java 代码 · 共 93 行

// CookieCommand.java
// $Id: CookieCommand.java,v 1.4 2000/08/16 21:37:47 ylafon Exp $  
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.jigsaw.ssi.commands;

import java.util.Dictionary;

import org.w3c.www.http.HTTP;
import org.w3c.www.http.HttpCookie;
import org.w3c.www.http.HttpCookieList;
import org.w3c.www.http.HttpMessage;

import org.w3c.jigsaw.http.Reply;
import org.w3c.jigsaw.http.Request;

import org.w3c.jigsaw.ssi.SSIFrame;

import org.w3c.util.ArrayDictionary;

/**
 * Cookies access from server side includes.
 * Powerfull thingy !
 */

public class CookieCommand implements Command {
    private final static String NAME = "cookie";
    private static final boolean debug = true;

    private static final String[] keys = {
	"get",	// get=<cookie-name> alt=<content>
	"if",	// if=<cookie-name>  then=<content> alt=<content>
	"alt",
	"then"
    };

    public String getName() {
	return NAME;
    }

    public Reply execute(SSIFrame ssiframe
			 , Request request
			 , ArrayDictionary parameters
			 , Dictionary variables) {
	Object values[]  = parameters.getMany(keys);
	String pget  = (String) values[0];
	String pif   = (String) values[1];
	String palt  = (String) values[2];
	String pthen = (String) values[3];

	if ( debug ) 
	    System.out.println("cookie: get="+pget
			       +", if="+pif
			       +", alt="+palt
			       +", then="+pthen);
	String content   = null;

	if ( pget != null ) {
	    // Try acessing that cookie value:
	    HttpCookieList list   = request.getCookie();
	    HttpCookie     cookie = null;
	    if ( list != null )
		cookie = list.getCookie(pget);
	    content = (cookie == null) ? palt : cookie.getValue();
	} else if ( pif != null ) {
	    HttpCookieList list   = request.getCookie();
	    HttpCookie     cookie = null;
	    if ( list != null )
		cookie = list.getCookie(pif);
	    content = (cookie != null) ? pthen : palt;
	} 
	// We are NOT doing notMod hack here (tricky and useless ?)
	Reply reply = ssiframe.createCommandReply(request, HTTP.OK);
	reply.setContent(content);
	return reply;
    }

    public String getValue(Dictionary variables, String variable,
			   Request request) {
	return "null";
    }

    /**
     * return true if reply can be cached.
     * @return a boolean.
     */
    public boolean acceptCaching() {
	return true;
    }

}