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A complete JPA 2.1 implementation for Standalone or EE Implementation. Enables Multiple Persistence units with full JTA Support using BTM. Perfect for Guice implementations, test suites, and Guice enabled Web Applications or EAR Projects. Requires JDK 8

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package com.guicedee.guicedpersistence.injectors;

import com.google.inject.PrivateModule;
import com.google.inject.persist.PersistService;
import com.google.inject.persist.UnitOfWork;
import com.guicedee.logger.LogFactory;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import java.lang.annotation.Annotation;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Provides jar scoped persistence private modules, and exposes them with the given annotation outwards
 *
 * @author GedMarc
 */
@SuppressWarnings("MissingClassJavaDoc")
public class JpaPersistPrivateModule
		extends PrivateModule
{
	private static final Logger log = LogFactory.getLog("JpaPersistPrivateModule");

	protected final String persistenceUnitName;

	protected final Properties props;

	protected final Class qualifier;

	public JpaPersistPrivateModule(String persistenceUnitName, Class qualifier)
	{
		this(persistenceUnitName, new Properties(), qualifier);
	}

	public JpaPersistPrivateModule(String persistenceUnitName, Properties props, Class qualifier)
	{
		this.persistenceUnitName = persistenceUnitName;
		this.props = props;
		this.qualifier = qualifier;
	}

	/**
	 * Configures the JPA
	 */
	@Override
	protected void configure()
	{
		install(new CustomJpaPersistModule(persistenceUnitName, qualifier).properties(props));
		JpaPersistPrivateModule.log.log(Level.FINE, "Bound EntityManagerFactory.class with @" + qualifier.getSimpleName());
		JpaPersistPrivateModule.log.log(Level.FINE, "Bound EntityManager.class with @" + qualifier.getSimpleName());
		JpaPersistPrivateModule.log.log(Level.FINE, "Bound PersistService.class with @" + qualifier.getSimpleName());
		JpaPersistPrivateModule.log.log(Level.FINE, "Bound UnitOfWork.class with @" + qualifier.getSimpleName());
		JpaPersistPrivateModule.log.log(Level.FINE, "Bound PersistenceUnit.class with @" + qualifier.getSimpleName());
		rebind(qualifier, EntityManagerFactory.class, EntityManager.class, PersistService.class, UnitOfWork.class, CustomJpaPersistService.class);
		doConfigure();
	}

	/**
	 * Rebinds and exposes the default connection handlers with the qualifier
	 *
	 * @param qualifier
	 * @param classes
	 */
	public void rebind(Class qualifier, Class... classes)
	{
		for (Class clazz : classes)
		{
			rebind(qualifier, clazz);
		}
	}

	/**
	 * bind your interfaces and classes as well as concrete ones that use JPA
	 * classes explicitly
	 */
	protected void doConfigure()
	{
		//Nothing needed
	}

	/**
	 * Rebinds and exposes the default connection handlers with the qualifier
	 *
	 * @param qualifier
	 * @param clazz
	 * @param 
	 */
	public  void rebind(Class qualifier, Class clazz)
	{
		bind(clazz).annotatedWith(qualifier)
		           .toProvider(binder().getProvider(clazz));
		expose(clazz).annotatedWith(qualifier);
	}

	/**
	 * binds and exposes a concrete class with an annotation
	 *
	 * @param 
	 * @param clazz
	 */
	protected  void bindConcreteClassWithQualifier(Class clazz)
	{
		bind(clazz).annotatedWith(qualifier)
		           .to(clazz);
		expose(clazz).annotatedWith(qualifier);
	}

	/**
	 * binds and exposes a concrete class without any annotation
	 *
	 * @param clazz
	 */
	protected void bindConcreteClass(Class clazz)
	{
		bind(clazz);
		expose(clazz);
	}
}