/// <summary>
/// Configures reference property
/// </summary>
/// <typeparam name="TRef">Reference object type</typeparam>
/// <param name="entityPropertyExpression">Property access expression</param>
/// <param name="jsonProperty">Json property name</param>
/// <param name="mode">Mapping mode</param>
/// <returns>Current configuration object</returns>
public JsonMapperConfiguration <T> ReferenceProperty <TRef>(Expression <Func <T, TRef> > entityPropertyExpression, string jsonProperty, JsonMapperEntryMode mode = JsonMapperEntryMode.TwoWay)
{
if (entityPropertyExpression == null)
{
throw new ArgumentNullException("entityPropertyExpression");
}
if (string.IsNullOrEmpty(jsonProperty))
{
throw new ArgumentException("jsonProperty is null or empty!", "jsonProperty");
}
var entityProperty = GetProperty(entityPropertyExpression);
var mapper = _manager.GetMapper <TRef>();
// create MapToJson action
var entityPropertyLambda = entityPropertyExpression.Compile();
Action <T, JObject> mapToJsonLabmda = (entity, json) =>
{
var value = entityPropertyLambda(entity);
json.Add(new JProperty(jsonProperty, value == null ? null : mapper.Map(value)));
};
// create MapToEntity action
var entityPropertySetterLambda = GetPropertySetter(entityProperty);
Action <JObject, T, bool> mapToEntityLabmda = (json, entity, patch) =>
{
var jProperty = json.Property(jsonProperty);
if (jProperty != null || !patch)
{
TRef refValue = default(TRef);
if (jProperty == null || jProperty.Value.Type == JTokenType.Null)
{
// null is passed - have to reset the foreign key property as well
var fkProperty = typeof(T).GetProperty(entityProperty.Name + "ID");
if (fkProperty != null)
{
fkProperty.SetValue(entity, null, null);
}
}
else if (jProperty.Value.Type == JTokenType.Object)
{
// apply the reference object
refValue = entityPropertyLambda(entity);
if (refValue == null || !patch)
{
refValue = (TRef)Activator.CreateInstance(typeof(TRef));
}
mapper.Apply(refValue, (JObject)jProperty.Value, patch);
}
else
{
throw new JsonMapperException("The value of the object property has invalid format, property: " + jsonProperty);
}
entityPropertySetterLambda(entity, refValue);
}
};
Entries.Add(new JsonMapperEntry <T>(mode, jsonProperty, entityProperty, mapToJsonLabmda, mapToEntityLabmda));
return(this);
}
/// <summary>
/// Configures reference property
/// </summary>
/// <typeparam name="TRef">Reference object type</typeparam>
/// <param name="entityPropertyExpression">Property access expression</param>
/// <param name="jsonProperty">Json property name</param>
/// <param name="mode">Mapping mode</param>
/// <returns>Current configuration object</returns>
public JsonMapperConfiguration <T> ReferenceProperty <TRef>(Expression <Func <T, TRef> > entityPropertyExpression, string jsonProperty, JsonMapperEntryMode mode = JsonMapperEntryMode.TwoWay)
{
if (entityPropertyExpression == null)
{
throw new ArgumentNullException("entityPropertyExpression");
}
if (string.IsNullOrEmpty(jsonProperty))
{
throw new ArgumentException("jsonProperty is null or empty!", "jsonProperty");
}
var entity = Expression.Parameter(typeof(T), "entity");
var json = Expression.Parameter(typeof(JObject), "json");
var entityProperty = GetProperty(entityPropertyExpression);
var mapper = _manager.GetMapper <TRef>();
var repository = _dataContext.GetRepositoryFor <TRef>();
// create MapToJson action
var jsonAddProperty = Expression.Call(json,
typeof(JObject).GetMethod("Add", new[] { typeof(JProperty) }),
Expression.New(typeof(JProperty).GetConstructor(new[] { typeof(string), typeof(object) }),
Expression.Constant(jsonProperty),
Expression.Condition(
Expression.NotEqual(Expression.Invoke(entityPropertyExpression, entity), Expression.Constant(null, typeof(TRef))),
Expression.Call(Expression.Constant(mapper), typeof(IJsonMapper <>).MakeGenericType(typeof(TRef))
.GetMethod("Map", new[] { typeof(TRef) }), Expression.Invoke(entityPropertyExpression, entity)),
Expression.Constant(null, typeof(JObject)))));
var mapToJsonLabmda = Expression.Lambda <Action <T, JObject> >(jsonAddProperty, entity, json);
// create MapToEntity action - use delegate for simplicity
Action <JObject, T> mapToEntityLabmda = (json2, entity2) =>
{
var jProperty = json2.Property(jsonProperty);
if (jProperty == null)
{
return;
}
TRef refValue = default(TRef);
var jValue = jProperty.Value as JValue;
if (jValue != null && jValue.Type == JTokenType.Null)
{
// null is passed - have to reset the foreign key property as well
var fkProperty = typeof(T).GetProperty(entityProperty.Name + "ID");
if (fkProperty != null)
{
fkProperty.SetValue(entity2, null, null);
}
}
else if (jValue != null && (jValue.Value is long))
{
// search object by ID
refValue = repository.Get((int)jValue);
if (refValue == null)
{
throw new JsonMapperException(string.Format("ID of the reference property is not found! " +
"Property: {0}, ID: {1}", jsonProperty, jValue));
}
}
else
{
throw new JsonMapperException(string.Format("The required reference property has invalid format! " +
"Property: {0}", jsonProperty));
}
entityProperty.SetValue(entity2, refValue, null);
};
Entries.Add(new JsonMapperEntry <T>(mode, jsonProperty, entityProperty, mapToJsonLabmda.Compile(), mapToEntityLabmda));
return(this);
}
