/// <summary>
/// Determine if the member value should be mapped from a rule, if true, then the value of 'value' will be set to the custom mapping
/// </summary>
/// <param name="info"></param>
/// <param name="expression"></param>
/// <param name="value"></param>
/// <returns></returns>
internal bool MapFromRule(PropertyMapDefinition info, MemberExpressionSignature expression, out object value)
{
//find the expression in our list based on the target object type, the target property type and the target property name
var action = (from m in _memberExpressionSignatures
where m.Equals(expression)
select m.ActionToExecute).SingleOrDefault();
if (action != null)
{
//invoke the action with the specified parameter
var memberExpression = new MemberMappingExpression <TSource>(info);
action.Invoke(memberExpression);
if (!memberExpression.IsIgnored)
{
//set the value to the output
value = memberExpression.ResultOfMapFrom;
return(true);
}
}
//no 'MapFrom' found
value = null;
return(false);
}
public MemberMappingExpression(PropertyMapDefinition info)
{
_info = info;
ResultOfMapFrom = null;
}
/// <summary>
/// Determines whether the member is already mapped
/// </summary>
/// <param name="member">The member.</param>
/// <returns>
/// <c>true</c> if [is already mapped] [the specified member]; otherwise, <c>false</c>.
/// </returns>
protected bool IsAlreadyMapped(PropertyMapDefinition member)
{
return(_memberMapped.Contains(member.GetTargetObjectHashCode()));
}
/// <summary>
/// Adds the hash code of the member that has been mapped
/// </summary>
/// <param name="member">The member to get the hashcode from</param>
protected void AddMemberMapped(PropertyMapDefinition member)
{
_memberMapped.Add(member.GetTargetObjectHashCode());
}
public void Map(object source, object target, MappingExecutionScope scope)
{
var ci = new PropertyMapDefinition
{
Source =
{
Type = source.GetType(),
Value = source
},
Target =
{
Type = target.GetType(),
Value = target
}
};
var sourceProps = source.GetProperties();
var targetProps = target.GetProperties();
//create MemberExpressionSignature for each property
var targetPropDefs = targetProps.Cast <PropertyDescriptor>()
.Select(x => new
{
expression = new MemberExpressionSignature(
x.PropertyType,
typeof(TTarget),
x.Name),
property = x
}).ToArray();
//before we map the members by name, we need to ignore any members that have been referenced in the member expressions
var filteredTargetProps = new PropertyDescriptorCollection(
(from t in targetPropDefs
where !_mapper.MappingContext.MemberExpressions.Any(x => x.Equals(t.expression))
select t.property).ToArray());
foreach (PropertyDescriptor s in sourceProps)
{
var t = filteredTargetProps.Find(s.Name, false);
if (t == null)
{
continue;
}
var reflectedProp = ci.Target.Type.GetProperty(t.Name);
if (reflectedProp == null)
{
continue;
}
if (!reflectedProp.CanWrite)
{
continue;
}
ci.SourceProp.Name = s.Name;
ci.SourceProp.Value = s.GetValue(source);
ci.SourceProp.Type = s.PropertyType;
ci.TargetProp.Name = t.Name;
ci.TargetProp.Type = t.PropertyType;
ci.TargetProp.Value = t.GetValue(target);
//if people have overridden this injector, we'll need to check that this hasn't already been mapped
if (IsAlreadyMapped(ci))
{
continue;
}
//check that we can proceed with setting this value
if (IsTypeMappable(s.PropertyType, t.PropertyType))
{
//set the output value to the source
ci.TargetProp.Value = ci.SourceProp.Value;
}
else
{
var hasConverted = false;
// If no explicit mapping exists, but a TypeConverter exists between the source & destination types, use that
if (TypeFinder.IsImplicitValueType(ci.TargetProp.Type) &&
!IsMapperRegistered(ci.SourceProp.Type, ci.TargetProp.Type))
{
var converter = TypeDescriptor.GetConverter(ci.SourceProp.Type);
if (converter != null && converter.CanConvertTo(ci.TargetProp.Type))
{
ci.TargetProp.Value = converter.ConvertTo(ci.SourceProp.Value, ci.TargetProp.Type);
hasConverted = true;
}
else
{
converter = TypeDescriptor.GetConverter(ci.TargetProp.Type);
if (converter != null && converter.CanConvertFrom(ci.SourceProp.Type))
{
ci.TargetProp.Value = converter.ConvertFrom(ci.SourceProp.Value);
hasConverted = true;
}
}
}
if (!hasConverted)
{
// If we can't simply map it by setting the value, then we'll send the operation back through the mapper
// Also, if it's not a reference type, we can't map it in place and have to set the value of the property to a new value
if (TypeFinder.IsImplicitValueType(ci.TargetProp.Type) || ci.TargetProp.Value == null)
{
//map to new
var val = MapToNew(ci.SourceProp.Value, ci.SourceProp.Type, ci.TargetProp.Type, scope);
ci.TargetProp.Value = val;
}
else
{
//map to existing
MapToExisting(ci.SourceProp.Value, ci.TargetProp.Value, ci.SourceProp.Type, ci.TargetProp.Type);
}
}
}
SetProperty(reflectedProp, target, ci.TargetProp.Value, scope);
//tag this as already mapped
AddMemberMapped(ci);
}
//now that we've mapped by name, lets map by rule
foreach (var signature in _mapper.MappingContext.MemberExpressions)
{
//get the target property definition with the expression mapped
var targetProp = targetPropDefs.Single(x => x.expression.Equals(signature));
var reflectedProp = ci.Target.Type.GetProperty(targetProp.property.Name);
if (reflectedProp == null)
{
throw new MissingMemberException("Could not access property " + targetProp.property.Name + " on object Type " + targetProp.property.ComponentType.Name);
}
//fill in the TypeMapDefinition object
ci.TargetProp.Name = targetProp.property.Name;
ci.TargetProp.Type = targetProp.property.PropertyType;
//now, try to map from a rule, if successful set the value... the MapFromRule will automatically add the Info to the already mapped list.
object val;
if (!IsAlreadyMapped(ci) && _mapper.MappingContext.MapFromRule(ci, targetProp.expression, out val))
{
if (!reflectedProp.CanWrite)
{
throw new MemberAccessException("A member expression has been declared for a writeable mapping operation for property " + targetProp.property.Name + " on object Type " + targetProp.property.ComponentType.Name + " but this property is readonly and cannot be written to");
}
SetProperty(reflectedProp, target, val, scope);
//tag this as already mapped
AddMemberMapped(ci);
}
}
}
