org.dspace.app.xmlui.aspect.general

Class IfModifiedSinceSelector

java.lang.Object

org.dspace.app.xmlui.aspect.general.IfModifiedSinceSelector

All Implemented Interfaces:

org.apache.cocoon.selection.Selector

public class IfModifiedSinceSelector
extends Object
implements org.apache.cocoon.selection.Selector

This simple selector looks for the If-Modified-Since header, and returns true if the Item in the request has not been modified since that date. The expression is ignored since the test is inherent in the request.

Typical sitemap usage:

 <map:match type="HandleTypeMatcher" pattern="item">
    <map:select type="IfModifiedSinceSelector">
      <map:when test="true">
        <map:act type="NotModifiedAction"/>
        <map:serialize/>
      </map:when>
      <map:otherwise>
        <map:transform type="ItemViewer"/>
        <map:serialize type="xml"/>
      </map:otherwise>
    </map:select>
  </map:match>
 
 

Author:

Larry Stone

Field Summary

Fields inherited from interface org.apache.cocoon.selection.Selector

ROLE

Constructor Summary

Constructors

Constructor and Description
IfModifiedSinceSelector()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	select(String expression, Map objectModel, org.apache.avalon.framework.parameters.Parameters parameters) Check for If-Modified-Since header on request, and returns true if the Item should *not* be sent, i.e.

Methods inherited from class java.lang.Object

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

Constructor Detail

IfModifiedSinceSelector

public IfModifiedSinceSelector()

Method Detail

select

public boolean select(String expression,
             Map objectModel,
             org.apache.avalon.framework.parameters.Parameters parameters)

Check for If-Modified-Since header on request, and returns true if the Item should *not* be sent, i.e. if the response status should be 304 (HttpServletResponse.SC_NOT_MODIFIED).

Specified by:

select in interface org.apache.cocoon.selection.Selector

Parameters:

expression - is ignored

objectModel - environment passed through via Cocoon.

parameters - sitemap parameters.

Returns:

null or map containing value of sitemap parameter 'pattern'