org.apache.cocoon.acting
Class ResourceExistsAction

java.lang.Object
  extended by org.apache.avalon.framework.logger.AbstractLogEnabled
      extended by org.apache.cocoon.acting.AbstractAction
          extended by org.apache.cocoon.acting.ServiceableAction
              extended by org.apache.cocoon.acting.ResourceExistsAction
All Implemented Interfaces:
Component, LogEnabled, Serviceable, ThreadSafe, Action

public class ResourceExistsAction
extends ServiceableAction
implements ThreadSafe

This action simply checks to see if a resource identified by the src sitemap attribute exists or not. The action returns empty Map if resource exists, null otherwise.

Instead of src attribute, source can be specified using parameter named url (this is old syntax, should be removed soon).

NOTE: ResourceExistsSelector should be preferred to this component, as the semantics of a Selector better matches the supplied functionality.

Version:
CVS $Id: ResourceExistsAction.html 1304258 2012-03-23 10:09:27Z ilgrosso $
Author:
Donald Ball

Field Summary
 
Fields inherited from class org.apache.cocoon.acting.ServiceableAction
manager
 
Fields inherited from class org.apache.cocoon.acting.AbstractAction
EMPTY_MAP
 
Fields inherited from interface org.apache.cocoon.acting.Action
ROLE
 
Constructor Summary
ResourceExistsAction()
           
 
Method Summary
 Map act(Redirector redirector, SourceResolver resolver, Map objectModel, String src, Parameters parameters)
          Controls the processing against some values of the Dictionary objectModel and returns a Map object with values used in subsequent sitemap substitution patterns.
 
Methods inherited from class org.apache.cocoon.acting.ServiceableAction
service
 
Methods inherited from class org.apache.avalon.framework.logger.AbstractLogEnabled
enableLogging, getLogger, setupLogger, setupLogger, setupLogger
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ResourceExistsAction

public ResourceExistsAction()
Method Detail

act

public Map act(Redirector redirector,
               SourceResolver resolver,
               Map objectModel,
               String src,
               Parameters parameters)
        throws Exception
Description copied from interface: Action
Controls the processing against some values of the Dictionary objectModel and returns a Map object with values used in subsequent sitemap substitution patterns. NOTE: This interface is designed so that implentations can be ThreadSafe. When an action is ThreadSafe, only one instance serves all requests : this reduces memory usage and avoids pooling.

Specified by:
act in interface Action
resolver - The SourceResolver in charge
objectModel - The Map with object of the calling environment which can be used to select values this controller may need (ie Request, Response).
src - A source String to the Action
parameters - The Parameters for this invocation
Returns:
Map The returned Map object with sitemap substitution values which can be used in subsequent elements attributes like src= using a xpath like expression: src="mydir/{myval}/foo" If the return value is null the processing inside the element of the sitemap will be skipped.
Throws:
Exception - Indicates something is totally wrong


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