/* * Copyright 2015 JAXIO http://www.jaxio.com * * 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.jaxio.jpa.querybyexample; import javax.enterprise.context.ApplicationScoped; import javax.inject.Inject; import javax.inject.Named; import javax.persistence.EntityManager; import javax.persistence.criteria.CriteriaBuilder; import javax.persistence.criteria.Expression; import javax.persistence.criteria.Predicate; import javax.persistence.criteria.Root; import javax.persistence.metamodel.EntityType; import javax.persistence.metamodel.SingularAttribute; import java.util.List; import static com.google.common.collect.Lists.newArrayList; import static javax.persistence.metamodel.Attribute.PersistentAttributeType.MANY_TO_ONE; import static javax.persistence.metamodel.Attribute.PersistentAttributeType.ONE_TO_ONE; @ApplicationScoped @Named public class ByPatternUtil { @Inject private EntityManager em; @Inject private JpaUtil jpaUtil; /* * Lookup entities having at least one String attribute matching the passed sp's pattern */ @SuppressWarnings("unchecked") public <T> Predicate byPattern(Root<T> root, CriteriaBuilder builder, SearchParameters sp, Class<T> type) { if (!sp.hasSearchPattern()) { return null; } List<Predicate> predicates = newArrayList(); EntityType<T> entity = em.getMetamodel().entity(type); String pattern = sp.getSearchPattern(); for (SingularAttribute<? super T, ?> attr : entity.getSingularAttributes()) { if (attr.getPersistentAttributeType() == MANY_TO_ONE || attr.getPersistentAttributeType() == ONE_TO_ONE) { continue; } if (attr.getJavaType() == String.class) { predicates.add(jpaUtil.stringPredicate((Expression<String>) root.get(jpaUtil.attribute(entity, attr)), pattern, sp, builder)); } } return jpaUtil.orPredicate(builder, predicates); } }