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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.util.Iterator;
import java.util.List;
import net.wotonomy.foundation.NSMutableArray;
/**
* This class represents a parent node in an element tree. It has no content in
* itself, and exists only to forward messages to each of its children, in turn.
* Package access only, as it is not in the specification.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 905 $
*/
class WOParentElement extends WOElement {
NSMutableArray children;
/**
* Default constructor.
*/
public WOParentElement() {
children = new NSMutableArray();
}
/**
* Returns an element with the specified children.
*/
public WOParentElement(List childElements) {
this();
children.addAll(childElements);
}
/**
* 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) {
WOElement element;
Iterator it = children.iterator();
while (it.hasNext()) {
element = (WOElement) it.next();
aContext.pushElement(element);
element.ensureAwakeInContext(aContext);
aContext.popElement();
}
}
/**
* Forwards this message to all child elements.
*/
public void takeValuesFromRequest(WORequest aRequest, WOContext aContext) {
WOElement element;
// aContext.incrementLastElementIDComponent();
aContext.appendZeroElementIDComponent();
Iterator it = children.iterator();
while (it.hasNext()) {
element = (WOElement) it.next();
aContext.pushElement(element);
aContext.incrementLastElementIDComponent();
element.takeValuesFromRequest(aRequest, aContext);
aContext.popElement();
}
aContext.deleteLastElementIDComponent();
}
/**
* Forwards this message to all child elements, returning the first non-null
* result.
*/
public WOActionResults invokeAction(WORequest aRequest, WOContext aContext) {
WOElement element;
// aContext.incrementLastElementIDComponent();
aContext.appendZeroElementIDComponent();
WOActionResults result = null;
Iterator it = children.iterator();
while (it.hasNext()) {
element = (WOElement) it.next();
aContext.pushElement(element);
aContext.incrementLastElementIDComponent();
result = element.invokeAction(aRequest, aContext);
aContext.popElement();
if (result != null)
break;
}
aContext.deleteLastElementIDComponent();
return result;
}
/**
* Forwards this message to all child elements.
*/
public void appendToResponse(WOResponse aResponse, WOContext aContext) {
WOElement element;
// aContext.incrementLastElementIDComponent();
aContext.appendZeroElementIDComponent();
// for each child element
Iterator it = children.iterator();
while (it.hasNext()) {
element = (WOElement) it.next();
aContext.pushElement(element);
aContext.incrementLastElementIDComponent();
// forward the message
element.appendToResponse(aResponse, aContext);
aContext.popElement();
}
aContext.deleteLastElementIDComponent();
}
public WOResponse generateResponse() {
WOResponse r = new WOResponse();
return r;
}
public String toString() {
StringBuffer result = new StringBuffer();
result.append("[WOParentElement: ");
// for each child element
Iterator it = children.iterator();
while (it.hasNext()) {
result.append("[ ");
result.append(it.next().toString());
result.append(" ]");
}
result.append(" ]");
return result.toString();
}
}
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