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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.jwebmp.guicedpersistence.scanners;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.jwebmp.logger.LogFactory;
import com.oracle.jaxb21.Persistence;
import com.oracle.jaxb21.PersistenceContainer;
import com.oracle.jaxb21.PersistenceUnit;
import com.oracle.jaxb21.Property;
import io.github.classgraph.Resource;
import io.github.classgraph.ResourceList;
import org.json.JSONObject;
import org.json.XML;

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * A consumer that reads persistence.xml files into PersistenceUnit objects
 */
public class PersistenceByteArrayConsumer
		implements ResourceList.ByteArrayConsumer
{
	/**
	 * The logger
	 */
	private static final Logger log = LogFactory.getLog("PersistenceByteArrayConsumer");

	/**
	 * Object mapper reader for Persistence XML Files
	 */
	private static final ObjectMapper om = new ObjectMapper();

	static
	{
		om.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
		om.configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES, false);
		om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
		om.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
	}

	/**
	 * Method accept ...
	 *
	 * @param resource
	 * 		of type Resource
	 * @param byteArray
	 * 		of type byte[]
	 */
	@Override
	public void accept(Resource resource, byte[] byteArray)
	{
		Set units = getPersistenceUnitsFromFile(byteArray);
		for (Iterator iterator = units.iterator(); iterator.hasNext(); )
		{
			PersistenceUnit unit = iterator.next();
			for (Property property : unit.getProperties()
			                             .getProperty())
			{
				if (property.getName()
				            .equals(PersistenceFileHandler.getIgnorePersistenceUnitProperty()) &&
				    "true".equalsIgnoreCase(property.getValue()))
				{

					iterator.remove();
				}
			}
			PersistenceFileHandler.getPersistenceUnits()
			                      .add(unit);
		}
		resource.close();
	}

	/**
	 * Gets all the persistence files
	 *
	 * @param persistenceFile
	 * 		The persistence file bytes
	 *
	 * @return A set of persistence units
	 */
	private Set getPersistenceUnitsFromFile(byte[] persistenceFile)
	{
		Set units = new TreeSet<>();
		try
		{
			String xml = new String(persistenceFile);
			JSONObject jsonObj = XML.toJSONObject(xml);
			PersistenceContainer pp = om.readValue(jsonObj.toString(), PersistenceContainer.class);
			Persistence p = pp.getPersistence();
			units.addAll(p.getPersistenceUnit());
		}
		catch (Throwable t)
		{
			log.log(Level.SEVERE, "Error streaming", t);
		}
		return units;
	}
}