CollectionResetter.java

/*
 * Copyright (C) 2009-2015 Open Wide
 * Contact: contact@openwide.fr
 * 
 * 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 fr.openwide.core.wicket.more.markup.html.form;

import org.apache.wicket.Component;
import org.apache.wicket.model.IModel;

import com.google.common.base.Supplier;

public class CollectionResetter<C> implements Resetter {

	private static final long serialVersionUID = 8258908044311296337L;

	private final Supplier<C> newCollectionSupplier;

	public CollectionResetter(Supplier<C> newCollectionSupplier) {
		this.newCollectionSupplier = newCollectionSupplier;
	}

	@Override
	public void reset(Component component) {
		@SuppressWarnings("unchecked")
		IModel<C> model = (IModel<C>) component.getDefaultModel();
		
		if (model != null && model.getObject() != null) {
			model.setObject(newCollectionSupplier.get());
		}
	}
}