| /* |
| * Copyright 2011 Marc Grue. |
| * |
| * 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 org.qi4j.sample.dcicargo.sample_a.infrastructure.model; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.qi4j.api.entity.EntityComposite; |
| import org.qi4j.api.query.Query; |
| |
| /** |
| * Callback Wicket model that holds a Zest Query object that can be called when needed to |
| * retrieve fresh data. |
| */ |
| public abstract class QueryModel<T, U extends EntityComposite> |
| extends ReadOnlyModel<List<T>> |
| { |
| private Class<T> dtoClass; |
| private transient List<T> dtoList; |
| |
| public QueryModel( Class<T> dtoClass ) |
| { |
| this.dtoClass = dtoClass; |
| } |
| |
| public List<T> getObject() |
| { |
| if( dtoList != null ) |
| { |
| return dtoList; |
| } |
| |
| dtoList = new ArrayList<T>(); |
| for( U entity : getQuery() ) |
| { |
| dtoList.add( getValue( entity ) ); |
| } |
| |
| return dtoList; |
| } |
| |
| // Callback to retrieve the (unserializable) Zest Query object |
| public abstract Query<U> getQuery(); |
| |
| public T getValue( U entity ) |
| { |
| return valueConverter.convert( dtoClass, entity ); |
| } |
| |
| public void detach() |
| { |
| dtoList = null; |
| } |
| } |