/*
* 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.markup.html.repeater.tree.nested;
import java.util.Iterator;
import org.apache.wicket.Component;
import org.apache.wicket.extensions.markup.html.repeater.tree.AbstractTree.State;
import org.apache.wicket.extensions.markup.html.repeater.tree.ITreeProvider;
import org.apache.wicket.extensions.markup.html.repeater.tree.NestedTree;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.markup.repeater.IItemFactory;
import org.apache.wicket.markup.repeater.IItemReuseStrategy;
import org.apache.wicket.markup.repeater.Item;
import org.apache.wicket.markup.repeater.RefreshingView;
import org.apache.wicket.model.IModel;
/**
* A subtree handles all children of a single node (or the root nodes if a <code>null</code> node
* was given to the constructor).
*
* @see ITreeProvider#getChildren(Object)
* @see ITreeProvider#getRoots()
*
* @author svenmeier
*/
public class Subtree<T> extends Panel
{
private static final long serialVersionUID = 1L;
private NestedTree<T> tree;
/**
* Create a subtree for the children of the node contained in the given model or the root nodes
* if the model contains <code>null</code>.
*
* @param id
* component id
* @param tree
* the containing tree
* @param model
*/
public Subtree(String id, final NestedTree<T> tree, final IModel<T> model)
{
super(id, model);
if (tree == null)
{
throw new IllegalArgumentException("argument [tree] cannot be null");
}
this.tree = tree;
RefreshingView<T> branches = new RefreshingView<T>("branches")
{
private static final long serialVersionUID = 1L;
@Override
protected Iterator<IModel<T>> getItemModels()
{
return new ModelIterator();
}
@Override
protected Item<T> newItem(String id, int index, IModel<T> model)
{
return newBranchItem(id, index, model);
}
@Override
protected void populateItem(Item<T> item)
{
IModel<T> model = item.getModel();
Component node = tree.newNodeComponent("node", model);
item.add(node);
item.add(tree.newSubtree("subtree", model));
}
};
branches.setItemReuseStrategy(new IItemReuseStrategy()
{
private static final long serialVersionUID = 1L;
@Override
public <S> Iterator<Item<S>> getItems(IItemFactory<S> factory,
Iterator<IModel<S>> newModels, Iterator<Item<S>> existingItems)
{
return tree.getItemReuseStrategy().getItems(factory, newModels, existingItems);
}
});
add(branches);
}
@SuppressWarnings("unchecked")
public IModel<T> getModel()
{
return (IModel<T>)getDefaultModel();
}
public T getModelObject()
{
return getModel().getObject();
}
protected BranchItem<T> newBranchItem(String id, int index, IModel<T> model)
{
return new BranchItem<>(id, index, model);
}
@Override
public boolean isVisible()
{
T t = getModel().getObject();
if (t == null)
{
// roots always visible
return true;
}
else
{
return tree.getState(t) == State.EXPANDED;
}
}
private final class ModelIterator implements Iterator<IModel<T>>
{
private Iterator<? extends T> children;
public ModelIterator()
{
T t = getModel().getObject();
if (t == null)
{
children = tree.getProvider().getRoots();
}
else
{
children = tree.getProvider().getChildren(t);
}
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
@Override
public boolean hasNext()
{
return children.hasNext();
}
@Override
public IModel<T> next()
{
return tree.getProvider().model(children.next());
}
}
}