// Copyright 2006, 2007 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry.internal.services;
import org.apache.tapestry.ComponentEventHandler;
import org.apache.tapestry.Link;
import org.apache.tapestry.TapestryConstants;
import org.apache.tapestry.internal.structure.ComponentPageElement;
import org.apache.tapestry.internal.structure.Page;
import org.apache.tapestry.internal.util.Holder;
import org.apache.tapestry.ioc.internal.util.Defense;
import org.apache.tapestry.runtime.Component;
import org.apache.tapestry.services.ActionResponseGenerator;
import org.apache.tapestry.services.ComponentEventResultProcessor;
public class ActionLinkHandlerImpl implements ActionLinkHandler
{
private final ComponentEventResultProcessor _resultProcessor;
private final RequestPageCache _cache;
private final LinkFactory _linkFactory;
public ActionLinkHandlerImpl(ComponentEventResultProcessor resultProcessor,
RequestPageCache cache, LinkFactory linkFactory)
{
_resultProcessor = resultProcessor;
_cache = cache;
_linkFactory = linkFactory;
}
public ActionResponseGenerator handle(String logicalPageName, String nestedComponentId,
String eventType, String[] context, String[] activationContext)
{
ActionLinkTarget actionLinkTarget = new ActionLinkTarget(eventType, logicalPageName,
nestedComponentId);
ComponentInvocation invocation = new ComponentInvocation(actionLinkTarget, context,
activationContext);
return handle(invocation);
}
public ActionResponseGenerator handle(ComponentInvocation invocation)
{
InvocationTarget target = invocation.getTarget();
// TODO: Not too happy about needing this cast; can the method be moved up to
// InvocationTarget or ComponentInvocation?
ActionLinkTarget actionLinkTarget = Defense.cast(target, ActionLinkTarget.class, "target");
Page page = _cache.get(actionLinkTarget.getPageName());
// This is the active page, until we know better.
String nestedId = actionLinkTarget.getComponentNestedId();
ComponentPageElement element = page.getComponentElementByNestedId(nestedId);
final Holder<ActionResponseGenerator> holder = new Holder<ActionResponseGenerator>();
ComponentEventHandler handler = new ComponentEventHandler()
{
@SuppressWarnings("unchecked")
public boolean handleResult(Object result, Component component, String methodDescription)
{
ActionResponseGenerator generator = _resultProcessor.processComponentEvent(
result,
component,
methodDescription);
holder.put(generator);
return true;
}
};
// If activating the page returns a "navigational result", then don't trigger the action
// on the component.
page.getRootElement().triggerEvent(
TapestryConstants.ACTIVATE_EVENT,
invocation.getActivationContext(),
handler);
if (holder.hasValue())
return holder.get();
element.triggerEvent(actionLinkTarget.getEventType(), invocation.getContext(), handler);
ActionResponseGenerator result = holder.get();
if (result == null)
{
Link link = _linkFactory.createPageLink(page);
result = new LinkActionResponseGenerator(link);
}
return result;
}
}