/**
* License Agreement.
*
* JBoss RichFaces - Ajax4jsf Component Library
*
* Copyright (C) 2007 Exadel, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.richfaces.renderkit;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import org.apache.commons.collections.MultiHashMap;
import org.richfaces.component.Draggable;
import org.richfaces.component.Dropzone;
import org.richfaces.event.DnDEvent;
/**
* @author Nick Belaevski - nbelaevski@exadel.com
* created 27.12.2006
*
*/
final class DnDEventsExchangeMailer {
private DnDEventsExchangeMailer() {
}
private static class EventInfoStructure {
private DnDEvent dndEvent;
private EventCallback eventCallback;
private Object type;
private Object value;
public EventInfoStructure(DnDEvent dndEvent,
EventCallback eventCallback, Object type, Object value) {
super();
this.dndEvent = dndEvent;
this.eventCallback = eventCallback;
this.type = type;
this.value = value;
}
}
static abstract class EventCallback {
abstract void processEvent(DnDEvent dndEvent, UIComponent source, FacesContext facesContext, Object type, Object value);
}
static DnDEventsExchangeMailer getInstance(FacesContext facesContext) {
synchronized (facesContext) {
Map requestMap = facesContext.getExternalContext().getRequestMap();
String attrName = DnDEventsExchangeMailer.class.getName();
DnDEventsExchangeMailer instance;
if ((instance = (DnDEventsExchangeMailer) requestMap.get(attrName)) == null) {
instance = new DnDEventsExchangeMailer();
requestMap.put(attrName, instance);
}
return instance;
}
}
private MultiHashMap queuedMap = new MultiHashMap();
private Map components = new HashMap();
private void processEvent(UIComponent source, FacesContext facesContext, DnDEvent dndEvent, EventCallback callback, Object type, Object value) {
if (callback != null) {
callback.processEvent(dndEvent, source, facesContext, type, value);
}
}
public void mailEvent(String sourceId, UIComponent target, FacesContext facesContext, DnDEvent dndEvent,
EventCallback callback, Object type, Object value, boolean isDraggable) {
//we should queue event right now to preserve row key if its generator
//is nested in UIData...
dndEvent.queue();
UIComponent component = (UIComponent) components.get(sourceId);
String targetId = target.getClientId(facesContext);
if (component == null) {
//component with that sourceId have never mailed anything before - wait
queuedMap.put(sourceId, new EventInfoStructure(dndEvent, callback, type, value));
components.put(targetId, target);
} else {
//check queued mail lists for current component
List queue = (List) queuedMap.get(targetId);
if (queue != null) {
Iterator iterator = queue.iterator();
if (iterator.hasNext()) {
EventInfoStructure eventInfo = (EventInfoStructure) iterator.next();
Draggable draggable;
Dropzone dropzone;
Object acceptedTypes;
Object dragType;
if (isDraggable) {
draggable = (Draggable) target;
dropzone = (Dropzone) component;
acceptedTypes = eventInfo.type;
dragType = type;
} else {
draggable = (Draggable) component;
dropzone = (Dropzone) target;
acceptedTypes = type;
dragType = eventInfo.type;
}
if (DnDValidator.validateAcceptTypes(facesContext,
draggable, dropzone,
dragType, acceptedTypes)) {
processEvent(target, facesContext, eventInfo.dndEvent, eventInfo.eventCallback,
type, value);
//we know the component - process event now
processEvent(component, facesContext, dndEvent, callback,
eventInfo.type, eventInfo.value);
} else {
dndEvent.invalidate();
eventInfo.dndEvent.invalidate();
}
iterator.remove();
}
if (!iterator.hasNext()) {
queuedMap.remove(targetId);
}
}
}
}
}