/*
    *  Copyright 2010, 2011 Christopher Pheby
    *
    *  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.jadira.usertype.spi.shared;
  
  import java.io.Serializable;
  
  import org.hibernate.HibernateException;
  import org.hibernate.engine.spi.SharedSessionContractImplementor;
  import org.hibernate.type.SerializationException;
  
  public abstract class AbstractUserType implements Serializable {
  
      private static final long serialVersionUID = -3503387360213242237L;
  
      public boolean isMutable() {
          return false;
      }
  
      public boolean equals(Object x, Object y) throws HibernateException {
      	if ((x == null) && (y == null)) {
      		return true;
      	}
          if ((x == null) || (y == null)) {
              return false;
          }
      	if (x == y) {
              return true;
          }
          return x.equals(y);
      }
  
      public int hashCode(Object x) throws HibernateException {
          assert (x != null);
          return x.hashCode();
      }
  
      public Object assemble(Serializable cachedValue, Object owner) throws HibernateException {
          return deepCopy(cachedValue);
      }
  
      public Serializable disassemble(Object value) throws HibernateException {
  
          final Serializable result;
  
          if (value == null) {
              result = null;
          } else {
              final Object deepCopy = deepCopy(value);
              if (!(deepCopy instanceof Serializable)) {
                  throw new SerializationException(String.format("deepCopy of %s is not serializable", value), null);
              }
              result = (Serializable) deepCopy;
          }
  
          return result;
      }
  
      public Object replace(Object originalValue, Object target, Object owner) throws HibernateException {
          return deepCopy(originalValue);
      }
  
      public Object deepCopy(Object value) throws HibernateException {
          return value;
      }
      
      /**
       * Included to allow session state to be applied to the user type
       * @param session The session
       */
      public void beforeNullSafeOperation(SharedSessionContractImplementor session) {
      	
      	ConfigurationHelper.setCurrentSessionFactory(session.getFactory());
      	if (this instanceof IntegratorConfiguredType) {
      		((IntegratorConfiguredType)this).applyConfiguration(session.getFactory());
      	}
      }
      
      /**
       * Included to allow session state to be disassociated from the user type.
       * This should be called from a finally block for surety.
       * @param session The session
       */
      public void afterNullSafeOperation(SharedSessionContractImplementor session) {
      	ConfigurationHelper.setCurrentSessionFactory(null);
      }
  }