EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.hibernate;

import java.io.Serializable;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Types;

import java.util.EnumSet;

import java.util.HashSet;

import java.util.Properties;

import java.util.Set;

import org.apache.commons.lang3.StringUtils;

import org.apache.log4j.Logger;

import org.hibernate.HibernateException;

import org.hibernate.engine.spi.SessionImplementor;

import org.hibernate.type.StandardBasicTypes;

import org.hibernate.usertype.ParameterizedType;

import org.hibernate.usertype.UserType;

import org.jadira.usertype.dateandtime.shared.spi.AbstractUserType;

import eu.etaxonomy.cdm.model.common.IKeyTerm;

/**

 * User type for EnumSet

 * @author a.mueller

 * @since 25-02-2019

 */

public class EnumSetUserType<E extends Enum<E>>  extends AbstractUserType implements UserType, ParameterizedType {

    private static final long serialVersionUID = 1060802925284271666L;

    @SuppressWarnings("unused")

	private static final Logger logger = Logger.getLogger(EnumSetUserType.class);

    private static final String SEP = "#";

	private Class<E> clazz = null;

	public EnumSetUserType(){}

    public EnumSetUserType(Class<E> c) {

    	this.clazz = c;

    }

	@Override

	@SuppressWarnings("unchecked")

	public void setParameterValues(Properties parameters) {

		try {

			this.clazz = (Class<E>) Class.forName(parameters.getProperty("enumClass"));

		} catch (ClassNotFoundException e) {

			throw new RuntimeException(e);

		}

	}

	private static final int[] SQL_TYPES = { Types.VARCHAR };

	@Override

	public Object deepCopy(Object o) throws HibernateException {

		return o;

	}

	@Override

	public Serializable disassemble(Object value) throws HibernateException {

	    return (Serializable)value;

	}

	@Override

	public EnumSet<E> nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner)

			throws HibernateException, SQLException {

        String val = (String) StandardBasicTypes.STRING.nullSafeGet(rs, names, session, owner);

		if(val == null) {

			return null;

		} else {

		    Set<E> result = new HashSet<>();

			String[] splits = val.split(SEP);

			for (String split:splits){

			    if (StringUtils.isNotEmpty(split)) {

                    result.add((E)EnumUserType.getTerm(clazz, split));

                }

			}

			EnumSet<E> enumSet = EnumSet.copyOf(result);

			return enumSet;

		}

	}

	@Override

	public void nullSafeSet(PreparedStatement statement, Object value, int index, SessionImplementor session)

			throws HibernateException, SQLException {

		if (value == null) {

            StandardBasicTypes.STRING.nullSafeSet(statement, value, index, session);

        } else {

        	@SuppressWarnings("unchecked")

            EnumSet<E> enumSet = (EnumSet<E>)value;

        	String key = "#";

        	for(Enum<E> e: enumSet){

        	    key += ((IKeyTerm)e).getKey()+"#";

        	}

            StandardBasicTypes.STRING.nullSafeSet(statement, key, index, session);

        }

	}

	@Override

	public Class<E> returnedClass() {

		return clazz;

	}

	@Override

	public int[] sqlTypes() {

		return SQL_TYPES;

	}

}