org.grails.orm.hibernate.support.HibernateVersionSupport.java Source code

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Here is the source code for org.grails.orm.hibernate.support.HibernateVersionSupport.java

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/*
 * Copyright 2002-2016 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 org.grails.orm.hibernate.support;

import org.hibernate.FlushMode;
import org.hibernate.Session;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;

import java.lang.reflect.Method;

/**
 *
 * Methods to deal with the differences in different Hibernate versions
 *
 * @author Graeme Rocher
 * @author Juergen Hoeller
 *
 * @since 6.0
 *
 */
public class HibernateVersionSupport {

    private static Method getFlushMode;
    private static Method setFlushMode;

    static {
        try {
            // Hibernate 5.2+ getHibernateFlushMode()
            getFlushMode = Session.class.getMethod("getHibernateFlushMode");
            setFlushMode = Session.class.getMethod("setHibernateFlushMode", FlushMode.class);
            getFlushMode.setAccessible(true);
            setFlushMode.setAccessible(true);
        } catch (NoSuchMethodException ex) {
            try {
                // Hibernate 5.0/5.1 getFlushMode() with FlushMode return type
                getFlushMode = Session.class.getMethod("getFlushMode");
                setFlushMode = Session.class.getMethod("setFlushMode", FlushMode.class);
                getFlushMode.setAccessible(true);
                setFlushMode.setAccessible(true);
            } catch (NoSuchMethodException ex2) {
                throw new IllegalStateException("No compatible Hibernate getFlushMode signature found", ex2);
            }
        }
        // Check that it is the Hibernate FlushMode type, not JPA's...
        Assert.state(FlushMode.class == getFlushMode.getReturnType());
    }

    /**
     * Get the native Hibernate FlushMode, adapting between Hibernate 5.0/5.1 and 5.2+.
     * @param session the Hibernate Session to get the flush mode from
     * @return the FlushMode (never {@code null})
     * @since 4.3
     */
    public static FlushMode getFlushMode(Session session) {
        if (session != null) {
            return (FlushMode) ReflectionUtils.invokeMethod(getFlushMode, session);
        }
        return FlushMode.MANUAL;
    }

    /**
     * Set the native Hibernate FlushMode, adapting between Hibernate 5.0/5.1 and 5.2+.
     * @param session the Hibernate Session to get the flush mode from
     * @return the FlushMode (never {@code null})
     * @since 4.3
     */
    public static void setFlushMode(Session session, FlushMode flushMode) {
        ReflectionUtils.invokeMethod(setFlushMode, session, flushMode);
    }
}