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  package org.apache.cayenne.reflect.generic;
  
  import org.apache.cayenne.access.types.ValueObjectType;
  import org.apache.cayenne.access.types.ValueObjectTypeRegistry;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.map.ObjAttribute;
  
  import java.io.Serializable;
  import java.util.Objects;
  
  /**
   * @since 4.2
   */
  public class DefaultValueComparisonStrategyFactory implements ValueComparisonStrategyFactory {
  
      private static final ValueComparisonStrategy<Object> DEFAULT_STRATEGY = new DefaultValueComparisonStrategy();
  
      private final ValueObjectTypeRegistry valueObjectTypeRegistry;
  
      public DefaultValueComparisonStrategyFactory(@Inject ValueObjectTypeRegistry valueObjectTypeRegistry) {
          this.valueObjectTypeRegistry = valueObjectTypeRegistry;
      }
  
      @Override
      public ValueComparisonStrategy<Object> getStrategy(ObjAttribute attribute) {
          ValueObjectType<?, ?> valueObjectType = valueObjectTypeRegistry.getValueType(attribute.getJavaClass());
          if(valueObjectType == null) {
              return DEFAULT_STRATEGY;
          } else {
              return new ValueObjectTypeComparisonStrategy(valueObjectType);
          }
      }
  
      // Using classes instead of lambdas to allow serialization
  
      @SuppressWarnings({"rawtypes"})
      static class ValueObjectTypeComparisonStrategy implements ValueComparisonStrategy<Object>, Serializable {
          private final ValueObjectType valueObjectType;
  
          public ValueObjectTypeComparisonStrategy(ValueObjectType<?, ?> valueObjectType) {
              this.valueObjectType = valueObjectType;
          }
  
          @SuppressWarnings("unchecked")
          @Override
          public boolean equals(Object value1, Object value2) {
              return valueObjectType.equals(value1, value2);
          }
      }
  
      static class DefaultValueComparisonStrategy implements ValueComparisonStrategy<Object>, Serializable {
          @Override
          public boolean equals(Object a, Object b) {
              return Objects.equals(a, b);
          }
      }
  }
  