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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.io.Serializable;
import net.wotonomy.foundation.NSDictionary;
/**
* This class represents a static or dynamic portion of the
* content returned to a request. Each request walks a tree
* of WOElements to generate a response.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 905 $
*/
public abstract class WOElement implements WOActionResults, Serializable
{
NSDictionary associations;
/**
* Default constructor. Performs necessary initialization.
*/
public WOElement()
{
}
/**
* This method is called to retrieve user-entered data from
* the request. WOElements should retrieve data from the
* request based on their elementID and set values in the
* context's current WOComponent, typically those values that
* are associated with the element in the binding. This
* implementation does nothing.
*/
public void takeValuesFromRequest (WORequest aRequest, WOContext aContext)
{
// does nothing
}
/**
* This method is called on all objects and elements of the
* application until a non-null value is returned.
* WOElements should first check to see if they are the
* target of an action by checking the WOContext's senderID
* to see if it matches this element's elementID.
* If this element is the target, it should perform an
* appropriate action on the context's current WOComponent,
* usually the action specified in the binding, and return
* the result of that action. This implementation returns null.
*/
public WOActionResults invokeAction (WORequest aRequest, WOContext aContext)
{
return null;
}
/**
* This method is called on all elements of the content tree
* to build a response to a user request. The message should
* be forwarded to any child elements so that the entire tree
* is traversed. This implementation does nothing.
*/
public void appendToResponse (WOResponse aResponse, WOContext aContext)
{
// does nothing
}
/**
* Package access only. Called to initialize the component with
* the proper context before the start of the request-response cycle.
* If the context has a current component, that component becomes
* this component's parent.
*/
void ensureAwakeInContext (WOContext aContext)
{
// does nothing
}
}
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