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   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.access.types;
  
  import java.sql.CallableStatement;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.util.Objects;
  
  /**
   * @since 4.0
   */
  public class ValueObjectTypeFactory implements ExtendedTypeFactory {
  
      ValueObjectTypeRegistry valueObjectTypeRegistry;
  
      private ExtendedTypeMap map;
  
      public ValueObjectTypeFactory(ExtendedTypeMap map, ValueObjectTypeRegistry valueObjectTypeRegistry) {
          this.map = map;
          this.valueObjectTypeRegistry = valueObjectTypeRegistry;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public ExtendedType<? extends ValueObjectType> getType(Class<?> objectClass) {
  
          ValueObjectType<?, ?> valueObjectType = valueObjectTypeRegistry.getValueType(objectClass);
          if(valueObjectType == null) {
              return null;
          }
          ExtendedType<?> decorator = map.getExplictlyRegisteredType(valueObjectType.getTargetType().getCanonicalName());
  
          return new ExtendedTypeConverter(decorator, valueObjectType);
      }
  
      static class ExtendedTypeConverter<T, E> implements ExtendedType<T> {
  
          ExtendedType<E> extendedType;
          ValueObjectType<T, E> valueObjectType;
  
          ExtendedTypeConverter(ExtendedType<E> extendedType, ValueObjectType<T, E> valueObjectType) {
              this.extendedType = Objects.requireNonNull(extendedType);
              this.valueObjectType = Objects.requireNonNull(valueObjectType);
          }
  
          @Override
          public String getClassName() {
              return valueObjectType.getValueType().getName();
          }
  
          protected T toJavaObject(E materializedValue) {
              if(materializedValue == null) {
                  return null;
              }
              return valueObjectType.toJavaObject(materializedValue);
          }
  
          @Override
          public T materializeObject(CallableStatement rs, int index, int type) throws Exception {
              return toJavaObject(extendedType.materializeObject(rs, index, type));
          }
  
          @Override
          public T materializeObject(ResultSet rs, int index, int type) throws Exception {
              return toJavaObject(extendedType.materializeObject(rs, index, type));
          }
  
          @Override
          public void setJdbcObject(PreparedStatement statement, T value, int pos, int type, int precision) throws Exception {
              E dbValue = value == null ? null : valueObjectType.fromJavaObject(value);
              extendedType.setJdbcObject(statement, dbValue, pos, type, precision);
          }
  
          @Override
          public String toString(T value) {
              if (value == null) {
                  return "NULL";
              }
  
              return valueObjectType.toCacheKey(value);
          }
      }
  
  }
  