/* * Databinder: a simple bridge from Wicket to Hibernate * Copyright (C) 2006 Nathan Hamblen nathan@technically.us * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ package net.databinder.models.jpa; import java.util.List; import javax.persistence.EntityManager; import net.databinder.jpa.Databinder; import org.apache.wicket.model.LoadableDetachableModel; /** * Model for a List generated by a JPA query. This read-only model can be used * to fill ListModel and PropertyListModel components with rows from a database. * * @param <T> Object list generic parameter * * @author rhansen@kindleit.net */ public class JPAListModel<T> extends LoadableDetachableModel<List<T>> { private static final long serialVersionUID = 8178717667562698158L; private QueryBuilder queryBuilder; private String factoryKey; /** * Contructor for a simple query. * @param queryString query with no parameters */ public JPAListModel(final String queryString) { this(new QueryBinderBuilder(queryString)); } /** * Constructor for a parameterized query. * @param queryString Query with parameters * @param queryBinder object that binds the query parameters */ public JPAListModel(final String queryString, final QueryBinder queryBinder) { this(new QueryBinderBuilder(queryString, queryBinder)); } /** * Constructor for a list of all results in class. While this query will be too open for * most applications, it can useful in early development. * @param objectClass class objects to return */ public JPAListModel(final Class<T> objectClass) { this(new QueryBinderBuilder("from " + objectClass.getCanonicalName())); } /** * Constructor for a custom query that is built by the calling application. * @param queryBuilder builder to create and bind query object */ public JPAListModel(final QueryBuilder queryBuilder) { this.queryBuilder = queryBuilder; } /** @return session factory key, or null for the default factory */ public Object getFactoryKey() { return factoryKey; } /** * Set a factory key other than the default (null). * @param key session factory key * @return this, for chaining */ public JPAListModel<T> setFactoryKey(final String key) { this.factoryKey = key; return this; } /** * Load the object List through Hibernate, binding query parameters if available. */ @SuppressWarnings("unchecked") @Override protected List<T> load() { final EntityManager em = Databinder.getEntityManager(factoryKey); return queryBuilder.build(em).getResultList(); } }