/// <summary>
/// Initializes a new instance of the <see cref="FeatureExpression"/> class.
/// </summary>
/// <param name="featureType">The type of the feature.</param>
/// <param name="name">The name of the feature.</param>
/// <param name="valueExpressionFactory">Factory to extract the value for a given feature from the example object (input argument).</param>
/// <param name="valueValidExpressionFactories">Factories to provide validation before invoking the expression created through <see cref="ValueExpressionFactory"/>.</param>
/// <param name="featureExpressionFactory">The expression must create new Feature instances.</param>
/// <param name="namespace">The namespace this feature belongs to.</param>
/// <param name="featureGroup">The feature group this feature belongs to.</param>
/// <param name="enumerize">If true the marshaller enumerates the feature (as in creates a 1-hot encoding).</param>
/// <param name="variableName">The variable name to be used in the generated code.</param>
/// <param name="order">Used to order feature serialization.</param>
/// <param name="addAnchor">True if an anchor element should be added at the beginning of a dense feature array.</param>
/// <param name="stringProcessing">Configures string pre-processing for this feature.</param>
/// <param name="overrideSerializeMethod">An optional method overriding the otherwise auto-resolved serialization method.</param>
/// <param name="dictify">True if a dictionary should be build for this feature.</param>
/// <param name="parent">The parent feature expression.</param>
public FeatureExpression(Type featureType,
string name,
Func<Expression, Expression> valueExpressionFactory,
List<Func<Expression, Expression>> valueValidExpressionFactories = null,
NewFeatureExpressionDelegate featureExpressionFactory = null,
string @namespace = null,
char? featureGroup = null,
bool enumerize = false,
string variableName = null,
int? order = null,
bool addAnchor = false,
StringProcessing stringProcessing = StringProcessing.Split,
MethodInfo overrideSerializeMethod = null,
bool? dictify = null,
FeatureExpression parent = null)
{
if (featureType == null)
throw new ArgumentNullException("featureType");
if (valueExpressionFactory == null)
throw new ArgumentNullException("valueExpressionFactory");
Contract.EndContractBlock();
if(featureType.IsGenericType &&
featureType.GetGenericTypeDefinition() == typeof(Nullable<>))
{
this.IsNullable = true;
this.FeatureType = featureType.GetGenericArguments()[0];
}
else
{
this.IsNullable = false;
this.FeatureType = featureType;
}
this.Name = name;
this.ValueExpressionFactory = valueExpressionFactory;
this.ValueValidExpressionFactories = valueValidExpressionFactories;
this.FeatureExpressionFactory = featureExpressionFactory;
this.Namespace = @namespace;
this.FeatureGroup = featureGroup;
this.Enumerize = enumerize;
this.VariableName = variableName ?? name;
this.Order = order ?? 1;
this.AddAnchor = addAnchor;
this.Dictify = dictify ?? false;
this.StringProcessing = stringProcessing;
this.OverrideSerializeMethod = overrideSerializeMethod;
this.Dictify = dictify ?? false;
this.Parent = parent;
this.DenseFeatureValueElementType = InspectionHelper.GetEnumerableElementType(featureType);
if (!InspectionHelper.IsNumericType(this.DenseFeatureValueElementType))
this.DenseFeatureValueElementType = null;
}
public FeatureExpression(Type featureType,
string name,
Func <Expression, Expression> valueExpressionFactory,
List <Func <Expression, Expression> > valueValidExpressionFactories = null,
NewFeatureExpressionDelegate featureExpressionFactory = null,
string @namespace = null,
char?featureGroup = null,
bool enumerize = false,
string variableName = null,
int?order = null,
bool addAnchor = false,
StringProcessing stringProcessing = StringProcessing.Split,
MethodInfo overrideSerializeMethod = null,
bool?dictify = null)
{
if (featureType == null)
{
throw new ArgumentNullException("featureType");
}
if (valueExpressionFactory == null)
{
throw new ArgumentNullException("valueExpressionFactory");
}
Contract.EndContractBlock();
if (featureType.IsGenericType &&
featureType.GetGenericTypeDefinition() == typeof(Nullable <>))
{
this.IsNullable = true;
this.FeatureType = featureType.GetGenericArguments()[0];
}
else
{
this.IsNullable = false;
this.FeatureType = featureType;
}
this.Name = name;
this.ValueExpressionFactory = valueExpressionFactory;
this.ValueValidExpressionFactories = valueValidExpressionFactories;
this.FeatureExpressionFactory = featureExpressionFactory;
this.Namespace = @namespace;
this.FeatureGroup = featureGroup;
this.Enumerize = enumerize;
this.VariableName = variableName ?? name;
this.Order = order ?? 1;
this.AddAnchor = addAnchor;
this.Dictify = dictify ?? false;
this.StringProcessing = stringProcessing;
this.OverrideSerializeMethod = overrideSerializeMethod;
this.Dictify = dictify ?? false;
this.DenseFeatureValueElementType = InspectionHelper.GetDenseFeatureValueElementType(featureType);
}