Java tutorial
/* * Copyright 2004-2006 the original author or authors. * * 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 com.jklas.sample.petclinic.util; import java.util.Collection; import java.util.Iterator; import org.springframework.orm.ObjectRetrievalFailureException; import com.jklas.sample.petclinic.Entity; /** * Utility methods for handling entities. * Separate from the Entity class mainly because of dependency * on the ORM-associated ObjectRetrievalFailureException. * * @author Juergen Hoeller * @since 29.10.2003 * @see com.jlkas.sample.petclinic.samples.petclinic.Entity */ public abstract class EntityUtils { /** * Look up the entity of the given class with the given id * in the given collection. * @param entities the collection to search * @param entityClass the entity class to look up * @param entityId the entity id to look up * @return the found entity * @throws ObjectRetrievalFailureException if the entity was not found */ public static Entity getById(Collection entities, Class entityClass, int entityId) throws ObjectRetrievalFailureException { for (Iterator it = entities.iterator(); it.hasNext();) { Entity entity = (Entity) it.next(); if (entity.getId().intValue() == entityId && entityClass.isInstance(entity)) { return entity; } } throw new ObjectRetrievalFailureException(entityClass, new Integer(entityId)); } }