// Copyright 2008 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.tapestry5.internal.structure;
import java.util.Arrays;
import java.util.List;
import org.apache.tapestry5.ComponentEventCallback;
import org.apache.tapestry5.MarkupWriter;
import org.apache.tapestry5.Renderable;
import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
import org.apache.tapestry5.runtime.RenderCommand;
import org.apache.tapestry5.runtime.RenderQueue;
/**
* Used by {@link org.apache.tapestry5.internal.structure.ComponentPageElementImpl} to track the results of invoking the
* component methods for a render phase event.
*
* @since 5.0.19
*/
class RenderPhaseEventHandler implements ComponentEventCallback
{
private final RenderQueue renderQueue;
private boolean result = true;
private List<RenderCommand> commands;
public RenderPhaseEventHandler(RenderQueue renderQueue)
{
this.renderQueue = renderQueue;
}
boolean getResult()
{
return result;
}
void reset()
{
if (commands != null)
{
for (RenderCommand command : commands)
renderQueue.push(command);
}
result = true;
commands = null;
}
public boolean handleResult(Object result)
{
if (result instanceof Boolean)
{
this.result = (Boolean) result;
return true; // abort other handler methods
}
if (result instanceof RenderCommand)
{
RenderCommand command = (RenderCommand) result;
add(command);
return false; // do not abort!
}
if (result instanceof Renderable)
{
final Renderable renderable = (Renderable) result;
RenderCommand wrapper = new RenderCommand()
{
public void render(MarkupWriter writer, RenderQueue queue)
{
renderable.render(writer);
}
};
add(wrapper);
return false;
}
throw new RuntimeException(StructureMessages.wrongPhaseResultType(Arrays.asList(Boolean.class.getName(),
Renderable.class.getName(), RenderCommand.class.getName())));
}
private void add(RenderCommand command)
{
if (commands == null)
commands = CollectionFactory.newList();
commands.add(command);
}
}