org.mmbase.servlet
Class HandleServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.mmbase.servlet.MMBaseServlet
              org.mmbase.servlet.BridgeServlet
                  org.mmbase.servlet.HandleServlet

All Implemented Interfaces:

org.mmbase.servlet.MMBaseStarter, java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

Direct Known Subclasses:

AttachmentServlet, ImageServlet

public class HandleServlet

extends BridgeServlet

Base servlet for nodes with a 'handle' field. It serves as a basic implementation for more specialized servlets. The mime-type is always application/x-binary, forcing the browser to download.

Since:

MMBase-1.6

Version:

$Id: HandleServlet.java,v 1.15 2004/04/07 14:46:39 keesj Exp $

Author:

Michiel Meeuwissen

See Also:

ImageServlet, AttachmentServlet, Serialized Form

Field Summary

Fields inherited from class org.mmbase.servlet.MMBaseServlet

mmbase

Constructor Summary

HandleServlet()

Method Summary

void	doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) Serves a node with a byte[] handle field as an attachment.
protected java.util.Map	getAssociations() On default, servlets are not associated with any function.
protected java.lang.String	getMimeType(Node node)
void	init() The init of an MMBaseServlet checks if MMBase is running.
protected void	sendBytes(javax.servlet.http.HttpServletResponse res, byte[] bytes) Utility function to send bytes at the end of doGet implementation.
protected boolean	setCacheControl(javax.servlet.http.HttpServletResponse res, Node node) Sets cache-controlling headers.
protected boolean	setContent(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res, Node node, java.lang.String mimeType) Sets the content disposition header.
protected boolean	setExpires(javax.servlet.http.HttpServletResponse res, Node node) Sets the exires header.

Methods inherited from class org.mmbase.servlet.BridgeServlet

getAnonymousCloud, getCloud, getCloudName, getLastModified, getNode, readQuery

Methods inherited from class org.mmbase.servlet.MMBaseServlet

associateMapping, decRefCount, destroy, getMMBase, getRequestURL, getServletByAssociation, getServletByMapping, getServletInfo, getServletMappings, getServletMappingsByAssociation, incRefCount, service, setInitException, setMMBase

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPost, doPut, doTrace, service

Methods inherited from class javax.servlet.GenericServlet

getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HandleServlet

public HandleServlet()

Method Detail

getAssociations

protected java.util.Map getAssociations()

Description copied from class: MMBaseServlet

On default, servlets are not associated with any function. This function is called in the init method.

Overrides:

getAssociations in class MMBaseServlet

Returns:

A map of Strings (function) -> Integer (priority). Never null.

init

public void init()
          throws javax.servlet.ServletException

Description copied from class: MMBaseServlet

The init of an MMBaseServlet checks if MMBase is running. It not then it is started.

Overrides:

init in class BridgeServlet

Throws:

javax.servlet.ServletException

getMimeType

protected java.lang.String getMimeType(Node node)

setContent

protected boolean setContent(javax.servlet.http.HttpServletRequest req,
                             javax.servlet.http.HttpServletResponse res,
                             Node node,
                             java.lang.String mimeType)
                      throws java.io.IOException

Sets the content disposition header.

Returns:

true on success

Throws:

java.io.IOException

setExpires

protected boolean setExpires(javax.servlet.http.HttpServletResponse res,
                             Node node)

Sets the exires header.

Returns:

true on sucess

setCacheControl

protected boolean setCacheControl(javax.servlet.http.HttpServletResponse res,
                                  Node node)

Sets cache-controlling headers. Only nodes which are to be served to 'anonymous' might be (front proxy) cached. To other nodes there might be read restrictions, so they should not be stored in front-proxy caches.

Returns:

true if cacheing is disabled.

Since:

MMBase-1.7

doGet

public void doGet(javax.servlet.http.HttpServletRequest req,
                  javax.servlet.http.HttpServletResponse res)
           throws javax.servlet.ServletException,
                  java.io.IOException

Serves a node with a byte[] handle field as an attachment.

Overrides:

doGet in class MMBaseServlet

Throws:

javax.servlet.ServletException

java.io.IOException

sendBytes

protected final void sendBytes(javax.servlet.http.HttpServletResponse res,
                               byte[] bytes)
                        throws java.io.IOException

Utility function to send bytes at the end of doGet implementation.

Throws:

java.io.IOException