private static QueryGroup Parse <TEntity>(MemberExpression expression, object rightValue, ExpressionType expressionType, bool isNot, bool isEqualsTo) where TEntity : class
{
var queryGroup = (QueryGroup)null;
var value = rightValue ?? expression.GetValue();
// Check if there are values
if (value != null)
{
// Specialized for enum
if (expression.Type.IsEnum)
{
var dbType = TypeMapper.Get(expression.Type);
value = Enum.ToObject(expression.Type, value);
}
// Create a new field
var field = new QueryField(expression.Member.GetMappedName(), QueryField.GetOperation(expressionType), value);
// Set the query group
queryGroup = new QueryGroup(field);
// Set the query group IsNot property
queryGroup.SetIsNot(isEqualsTo == false);
}
// Return the result
return(queryGroup);
}
private static QueryGroup Parse <TEntity>(MemberExpression expression, ExpressionType expressionType, bool isNot = false, bool isEqualsTo = true) where TEntity : class
{
var queryGroup = (QueryGroup)null;
var value = expression.GetValue();
if (value != null)
{
var field = new QueryField(expression.Member.GetMappedName(), QueryField.GetOperation(expressionType), value);
queryGroup = new QueryGroup(field.AsEnumerable());
queryGroup.SetIsNot(isEqualsTo == false);
}
return(queryGroup);
}
private static QueryGroup ParseAllOrAnyForArray <TEntity>(MethodCallExpression expression, bool isNot = false, bool isEqualsTo = true) where TEntity : class
{
// Return null if there is no any arguments
if (expression.Arguments?.Any() == false)
{
return(null);
}
// Get the last property
var last = expression
.Arguments
.LastOrDefault();
// Make sure the last is a member
if (last == null || last?.IsLambda() == false)
{
throw new NotSupportedException($"Expression '{expression.ToString()}' is currently not supported.");
}
// Make sure the last is a binary
var lambda = last.ToLambda();
if (lambda.Body.IsBinary() == false)
{
throw new NotSupportedException($"Expression '{expression.ToString()}' is currently not supported.");
}
// Make sure it is a member
var binary = lambda.Body.ToBinary();
if (binary.Left.IsMember() == false && binary.Right.IsMember() == false)
{
throw new NotSupportedException($"Expression '{expression.ToString()}' is currently not supported. Expression must contain a single condition to any property of type '{typeof(TEntity).FullName}'.");
}
// Make sure it is a property
var member = binary.Left.IsMember() ? binary.Left.ToMember().Member : binary.Right.ToMember().Member;
if (member.IsPropertyInfo() == false)
{
throw new NotSupportedException($"Expression '{expression.ToString()}' is currently not supported.");
}
// Make sure the property is in the entity
var property = member.ToPropertyInfo();
if (PropertyCache.Get <TEntity>().FirstOrDefault(p => p.PropertyInfo == property) == null)
{
throw new InvalidQueryExpressionException($"Invalid expression '{expression.ToString()}'. The property {property.Name} is not defined on a target type '{typeof(TEntity).FullName}'.");
}
// Variables needed for fields
var queryFields = new List <QueryField>();
var conjunction = Conjunction.And;
// Support only various methods
if (expression.Method.Name == StringConstant.Any)
{
conjunction = Conjunction.Or;
}
else if (expression.Method.Name == StringConstant.All)
{
conjunction = Conjunction.And;
}
// Call the method
var first = expression.Arguments.First();
var values = (object)null;
// Identify the type of the argument
if (first.IsNewArray())
{
values = first.ToNewArray().GetValue();
}
else if (first.IsMember())
{
values = first.ToMember().GetValue();
}
// Values must be an array
if (values is Array)
{
var operation = QueryField.GetOperation(binary.NodeType);
foreach (var value in (Array)values)
{
queryFields.Add(new QueryField(property.Name, operation, value));
}
}
// Return the result
return(new QueryGroup(queryFields, null, conjunction, (isNot == isEqualsTo)));
}
/// <summary>
///
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="expression"></param>
/// <param name="rightValue"></param>
/// <param name="expressionType"></param>
/// <param name="isNot"></param>
/// <param name="isEqualsTo"></param>
/// <returns></returns>
private static QueryGroup Parse <TEntity>(MemberExpression expression,
object rightValue,
ExpressionType expressionType,
bool isNot,
bool isEqualsTo)
where TEntity : class
{
var queryGroup = (QueryGroup)null;
var value = rightValue;
var isForBoolean = expression.Type == typeof(bool) &&
(expressionType == ExpressionType.Not || expressionType == ExpressionType.AndAlso || expressionType == ExpressionType.OrElse);
var ignoreIsNot = false;
// Handle for boolean
if (value == null)
{
if (isForBoolean)
{
value = false;
ignoreIsNot = true;
}
else
{
value = expression.GetValue();
}
}
// Check if there are values
if (value != null)
{
// Specialized for enum
if (expression.Type.IsEnum)
{
value = Enum.ToObject(expression.Type, value);
}
// Create a new field
var field = (QueryField)null;
if (isForBoolean)
{
field = new QueryField(expression.Member.GetMappedName(),
value);
ignoreIsNot = true;
}
else
{
field = new QueryField(expression.Member.GetMappedName(),
QueryField.GetOperation(expressionType),
value);
}
// Set the query group
queryGroup = new QueryGroup(field);
// Set the query group IsNot property
if (ignoreIsNot == false)
{
queryGroup.SetIsNot(isEqualsTo == false);
}
}
// Return the result
return(queryGroup);
}
