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/*
 * Copyright 2008, Unitils.org
 * 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.unitils.orm.jpa;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

import org.unitils.core.Unitils;
import org.unitils.core.UnitilsException;
import org.unitils.orm.jpa.annotation.JpaEntityManagerFactory;

/**
 * Utility facade for handling JPA related stuff such as asserting whether the mappings correspond to the actual
 * structure of the database.
 *
 * @author Filip Neven
 * @author Tim Ducheyne
 */
public class JpaUnitils {
    /**
     * Checks if the mapping of the JPA entities with the database is still correct for the configurations
     * that are loaded for the current test.
     */
    public static void assertMappingWithDatabaseConsistent() {
        getJpaModule().assertMappingWithDatabaseConsistent(getTestObject());
    }

    /**
     * Flushes all pending entity manager updates to the database. This method is useful when the effect
     * of updates needs to be checked directly on the database, without passing through the currently active
     * EntityManager
     */
    public static void flushDatabaseUpdates() {
        getJpaModule().flushDatabaseUpdates(getTestObject());
    }

    /**
     * For the given target object, injects the active, transactional EntityManager into
     * fields or methods annotated with javax.persistence.PersistenceContext
     */
    public static void injectEntityManagerInto(Object target) {
        getJpaModule().injectJpaResourcesInto(getTestObject(), target);
    }

    /**
     * @return The EntityManagerFactory configured for the current test object (spring or using
     *     the {@link JpaEntityManagerFactory} annotation.
     */
    public static EntityManagerFactory getEntityManagerFactory() {
        return getJpaModule().getPersistenceUnit(getTestObject());
    }

    /**
     * @return An EntityManager associated with the current transaction. This method returns the
     *     same EntityManager during the course of a transaction.
     */
    public static EntityManager getEntityManager() {
        return getJpaModule().getPersistenceContext(getTestObject());
    }

    /**
     * @return The current test object
     */
    private static Object getTestObject() {
        Object testObject = Unitils.getInstance().getTestContext().getTestObject();
        if (testObject == null) {
            throw new UnitilsException("No current test found in context. Unable to execute specified operation");
        }
        return testObject;
    }

    /**
     * @return The {@link JpaModule}
     */
    private static JpaModule getJpaModule() {
        return Unitils.getInstance().getModulesRepository().getModuleOfType(JpaModule.class);
    }
}