cz.datalite.dao.support.JpaEntityInformationSupport.java Source code

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Here is the source code for cz.datalite.dao.support.JpaEntityInformationSupport.java

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/*
 * Copyright 2011 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 cz.datalite.dao.support;

import cz.datalite.helpers.StringHelper;

import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.metamodel.Metamodel;
import java.io.Serializable;

/**
 * Base class for {@link JpaEntityInformation} implementations to share common method implementations.
 * 
 * @author Oliver Gierke
 */
public abstract class JpaEntityInformationSupport<T, ID extends Serializable>
        extends AbstractEntityInformation<T, ID> implements JpaEntityInformation<T, ID> {

    /**
     * Creates a new {@link JpaEntityInformationSupport} with the given domain class.
     *
     * @param domainClass must not be {@literal null}.
     */
    public JpaEntityInformationSupport(Class<T> domainClass) {

        super(domainClass);
    }

    /**
     * Creates a {@link JpaEntityInformation} for the given domain class and {@link javax.persistence.EntityManager}.
     * 
     * @param domainClass must not be {@literal null}.
     * @param em must not be {@literal null}.
     * @return
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static <T> JpaEntityInformation<T, ?> getMetadata(Class<T> domainClass, EntityManager em) {

        assert (domainClass != null);
        assert (em != null);

        Metamodel metamodel = em.getMetamodel();

        return new JpaMetamodelEntityInformation(domainClass, metamodel);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.springframework.data.jpa.repository.support.JpaEntityInformation#
     * getEntityName()
     */
    public String getEntityName() {

        Class<?> domainClass = getJavaType();
        Entity entity = domainClass.getAnnotation(Entity.class);
        boolean hasName = !StringHelper.isNull(entity.name());

        return hasName ? entity.name() : domainClass.getSimpleName();
    }
}