wicket-spring-cattr-examples/src/main/java/wicket/spring/common/web/ContactDetachableModel.java

/*
 * $Id$
 * $Revision$
 * $Date$
 * 
 * ==============================================================================
 * 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 wicket.spring.common.web;

import wicket.Component;
import wicket.model.AbstractDetachableModel;
import wicket.model.IModel;
import wicket.spring.common.Contact;
import wicket.spring.common.ContactDao;

/**
 * Base class for contact detachable models. This class implements all necessary
 * logic except retrieval of the dao object, this way we can isolate that logic
 * in our example implementations.
 * 
 * @author Igor Vaynberg (ivaynberg)
 * 
 */
public abstract class ContactDetachableModel extends AbstractDetachableModel {

	private long id;

	private transient Contact contact;

	public ContactDetachableModel(Contact contact) {
		this.id = contact.getId();
		this.contact = contact;
	}

	public IModel getNestedModel() {
		return null;
	}

	protected final void onAttach() {
		contact = getContactDao().get(id);
	}

	protected void onDetach() {
		contact = null;
	}

	protected Object onGetObject(Component component) {
		return contact;
	}

	protected void onSetObject(Component component, Object object) {
		throw new UnsupportedOperationException();
	}

	protected abstract ContactDao getContactDao();

}