/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.wicket.extensions.breadcrumb.panel;
import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.extensions.breadcrumb.IBreadCrumbParticipant;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.util.visit.IVisit;
import org.apache.wicket.util.visit.IVisitor;
/**
* Base implementation for {@link Panel}/ {@link Component} based {@link IBreadCrumbParticipant}
* that decouples the implementation from the actual panel class.
*
* @author eelcohillenius
*/
public abstract class BreadCrumbParticipantDelegate implements IBreadCrumbParticipant
{
private static final long serialVersionUID = 1L;
private final Component component;
/**
* Construct.
*
* @param component
*/
public BreadCrumbParticipantDelegate(final Component component)
{
if (component == null)
{
throw new IllegalArgumentException("component must be not null");
}
this.component = component;
}
/**
* @see org.apache.wicket.extensions.breadcrumb.IBreadCrumbParticipant#getComponent()
*/
public Component getComponent()
{
return component;
}
/**
* If the previous participant is not null (and a component, which it should be), replace that
* component on it's parent with this one.
*
* @see org.apache.wicket.extensions.breadcrumb.IBreadCrumbParticipant#onActivate(org.apache.wicket.extensions.breadcrumb.IBreadCrumbParticipant)
*/
public void onActivate(final IBreadCrumbParticipant previous)
{
if (previous != null)
{
MarkupContainer parent = previous.getComponent().getParent();
if (parent != null)
{
final String thisId = component.getId();
if (parent.get(thisId) != null)
{
parent.replace(component);
}
else
{
// try to search downwards to match the id
// NOTE unfortunately, we can't rely on the path pre 2.0
Component c = parent.visitChildren(new IVisitor<Component, Component>()
{
public void component(final Component component,
final IVisit<Component> visit)
{
if (component.getId().equals(thisId))
{
visit.stop(component);
}
}
});
if (c == null)
{
// not found... do a reverse search (upwards)
c = parent.visitParents(MarkupContainer.class,
new IVisitor<MarkupContainer, Component>()
{
public void component(final MarkupContainer component,
final IVisit<Component> visit)
{
if (component.getId().equals(thisId))
{
visit.stop(component);
}
}
});
}
// replace if found
if (c != null)
{
c.replaceWith(component);
}
}
}
}
else if (component.getParent() != null)
{
component.getParent().replace(component);
}
}
}