content: /*
   * Copyright (C) 2012-2023 52°North Spatial Information Research GmbH
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published
   * by the Free Software Foundation.
   *
   * If the program is linked with libraries which are licensed under one of
   * the following licenses, the combination of the program with the linked
   * library is not considered a "derivative work" of the program:
   *
   *     - Apache License, version 2.0
   *     - Apache Software License, version 1.0
   *     - GNU Lesser General Public License, version 3
   *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
   *     - Common Development and Distribution License (CDDL), version 1.0
   *
   * Therefore the distribution of the program linked with libraries licensed
   * under the aforementioned licenses, is permitted by the copyright holders
   * if the distribution is compliant with both the GNU General Public
   * License version 2 and the aforementioned licenses.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
   * Public License for more details.
   */
  package org.n52.sos.ds.hibernate.type;
  
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Types;
  
  import org.hibernate.HibernateException;
  import org.hibernate.engine.spi.SharedSessionContractImplementor;
  
  /**
   * @param <T>
   *            the type that is serialized to a string
   *
   * @author <a href="mailto:c.autermann@52north.org">Christian Autermann</a>
   */
  public abstract class AbstractStringBasedHibernateUserType<T> extends AbstractHibernateUserType {
  
      public AbstractStringBasedHibernateUserType(Class<T> clazz) {
          super(clazz);
      }
  
      @Override
      public int[] sqlTypes() {
          return new int[] { Types.VARCHAR };
      }
  
      @Override
      public Object nullSafeGet(ResultSet rs, String[] names, SharedSessionContractImplementor session, Object owner)
              throws HibernateException, SQLException {
          String s = rs.getString(names[0]);
          return (s == null) ? null : decode(s);
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public void nullSafeSet(PreparedStatement st, Object value, int index, SharedSessionContractImplementor session)
              throws HibernateException, SQLException {
          if (value == null) {
              st.setNull(index, Types.VARCHAR);
          } else {
              st.setString(index, encode((T) value));
          }
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public Object deepCopy(Object value) throws HibernateException {
          return (value == null) ? null : decode(encode((T) value));
      }
  
      protected abstract T decode(String s) throws HibernateException;
  
      protected abstract String encode(T t) throws HibernateException;
  }
  