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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.web;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import jakarta.servlet.http.HttpServletResponse;
import net.wotonomy.foundation.NSArray;
/**
* A pure java implementation of WOResponse.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 905 $
*/
public class WOResponse extends WOMessage implements WOActionResults {
protected static String defaultEncoding;
private static SimpleDateFormat htmlDateFormat;
static {
defaultEncoding = "ISO8859_1";
htmlDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z");
htmlDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
}
private int status;
/**
* Parameterless constructor which should not be called.
*/
public WOResponse() {
status = -1; // -1 indicates not yet set
}
/**
* Sets the status code of the response. You should use the constants defined in
* HttpServletResponse.
*/
public void setStatus(int code) {
status = code;
}
/**
* Gets the current status code for the response.
*/
public int status() {
return status;
}
/**
* Sets a header in the response to disable client caching. (Whether this works
* depends on the client implementation.)
*/
public void disableClientCaching() {
String dateString = htmlDateFormat.format(new Date());
setHeader(dateString, "Date");
setHeader(dateString, "Expires");
setHeader("no-cache", "Pragma");
setHeaders(new NSArray(new Object[] { "private", "no-cache", "max-age = 0" }), "Cache-Control");
// System.out.println( "disableClientCaching: " + dateString );
}
/**
* Returns this object. (Implements the WOActionResults interface.)
*/
public WOResponse generateResponse() {
return this;
}
/**
* Generates the response using the specified servlet response, but does not
* flush the buffer. The caller is responsible for sending the response to the
* client. <br>
* <br>
* Note that this method is currently responsible for setting the content type
* to "text/html". As far as I can tell, WORequests have no way to set the
* content type and therefore must always be of type "text/html".
*/
void generateServletResponse(HttpServletResponse response) {
if (WOApplication.application().isPageRefreshOnBacktrackEnabled()) {
disableClientCaching();
}
String key;
java.util.Enumeration e, f;
// set content type: might be overwritten by headers below
response.setContentType("text/html");
// set status
if (status != -1) {
response.setStatus(status);
}
// set headers
f = _headers.allKeys().objectEnumerator();
while (f.hasMoreElements()) {
key = f.nextElement().toString();
e = ((NSArray) _headers.objectForKey(key)).objectEnumerator();
if (e.hasMoreElements()) {
// overwrite existing header
response.setHeader(key, e.nextElement().toString());
}
while (e.hasMoreElements()) {
response.addHeader(key, e.nextElement().toString());
}
}
// set cookies
e = _cookies.allValues().objectEnumerator();
while (e.hasMoreElements()) {
response.addCookie((WOCookie) e.nextElement());
}
try {
// write content
response.getOutputStream().write(_contentData.bytes());
if (status > 299) {
response.sendError(status);
}
} catch (Exception exc) {
throw new RuntimeException("Error writing response: " + exc);
}
}
/**
* Returns the current default encoding seting.
*/
public static String defaultEncoding() {
return defaultEncoding;
}
/**
* Sets the default encoding setting.
*/
public static void setDefaultEncoding(String encoding) {
defaultEncoding = encoding;
}
}
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