private FieldFilterTerm(AttributeDefinition attributeDefinition, FieldFilterTermOperator op,
IEnumerable<object> values)
{
AttributeDefinition = attributeDefinition;
Operator = op;
Values = values;
}
private FieldFilterTerm(AttributeDefinition attributeDefinition, FieldFilterTermOperator op,
IEnumerable <object> values)
{
AttributeDefinition = attributeDefinition;
Operator = op;
Values = values;
}
internal virtual Expression CreateFilterExpression(FieldFilterTermOperator @operator, IEnumerable <object> values, Expression parameter)
{
if (@operator == FieldFilterTermOperator.Exists)
{
return(CreateExistsFilterExpression(parameter));
}
if (@operator == FieldFilterTermOperator.NotExists)
{
var existsExpression = CreateExistsFilterExpression(parameter);
return(Expression.Not(existsExpression));
}
var method = GetOperatorMethod(@operator);
BinaryExpression result = null;
foreach (var value in values)
{
var left = CreateExpression(parameter);
var right = Expression.Constant(value);
var inner = method(left, right);
result = result == null ? inner : Expression.OrElse(result, inner);
}
return(result);
}
private Func <Expression, Expression, BinaryExpression> GetOperatorMethod(FieldFilterTermOperator @operator)
{
switch (@operator)
{
case FieldFilterTermOperator.Equal:
return(Expression.Equal);
case FieldFilterTermOperator.NotEqual:
return(Expression.NotEqual);
case FieldFilterTermOperator.Greater:
return(Expression.GreaterThan);
case FieldFilterTermOperator.GreaterOrEqual:
return(Expression.GreaterThanOrEqual);
case FieldFilterTermOperator.Less:
return(Expression.LessThan);
case FieldFilterTermOperator.LessOrEqual:
return(Expression.LessThanOrEqual);
}
throw new NotSupportedException($"Unsupported operator {@operator}");
}
private Func<Expression, Expression, BinaryExpression> GetOperatorMethod(FieldFilterTermOperator @operator)
{
switch (@operator)
{
case FieldFilterTermOperator.Equal:
return Expression.Equal;
case FieldFilterTermOperator.NotEqual:
return Expression.NotEqual;
case FieldFilterTermOperator.Greater:
return Expression.GreaterThan;
case FieldFilterTermOperator.GreaterOrEqual:
return Expression.GreaterThanOrEqual;
case FieldFilterTermOperator.Less:
return Expression.LessThan;
case FieldFilterTermOperator.LessOrEqual:
return Expression.LessThanOrEqual;
}
throw new NotSupportedException($"Unsupported operator {@operator}");
}
internal virtual Expression CreateFilterExpression(FieldFilterTermOperator @operator, IEnumerable<object> values, Expression parameter)
{
if (@operator == FieldFilterTermOperator.Exists)
return CreateExistsFilterExpression(parameter);
if (@operator == FieldFilterTermOperator.NotExists)
{
var existsExpression = CreateExistsFilterExpression(parameter);
return Expression.Not(existsExpression);
}
var method = GetOperatorMethod(@operator);
BinaryExpression result = null;
foreach (var value in values)
{
var left = CreateExpression(parameter);
var right = Expression.Constant(value);
var inner = method(left, right);
result = result == null ? inner : Expression.OrElse(result, inner);
}
return result;
}
