public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (!(value is ComparisonOperators))
{
return(String.Empty);
}
return(ComparisonOperatorNode.OperatorToString((ComparisonOperators)value));
}
private void AddOperand()
{
if (SelectedFilterConfiguration == null ||
SelectedFilterableArgument == null)
{
return;
}
var fieldLeaf = new ExpressionTreeFieldLeaf(null, SelectedFilterableArgument.BoundProperty);
object value;
if (SelectedFilterableArgument.DefaultValue != null)
{
value = SelectedFilterableArgument.DefaultValue;
}
else if (fieldLeaf.Property.PropertyType == typeof(DateTime))
{
value = DateTime.Now;
}
else if (fieldLeaf.Property.PropertyType == typeof(String))
{
value = String.Empty;
}
else if (fieldLeaf.Property.PropertyType.IsAbstract)
{
value = null;
}
else
{
value = Activator.CreateInstance(fieldLeaf.Property.PropertyType);
}
var valueLeaf = new ExpressionTreeValueLeaf(null, value);
var compariosonNode = new ComparisonOperatorNode(null,
fieldLeaf,
valueLeaf,
SelectedFilterableArgument.AvailableOperators.FirstOrDefault());
//First node always add as comparision node
if (SelectedFilterConfiguration.Conditions.Root == null)
{
SelectedFilterConfiguration.Conditions.Root = compariosonNode;
}
else
{
//Default add join node as AND operator
if (SelectedExpression == null)
{
//If adding to root
var rootBooleanNode = new BooleanOperatorNode(null,
compariosonNode,
SelectedFilterConfiguration.Conditions.Root,
BooleanOperators.And);
SelectedFilterConfiguration.Conditions.Root = rootBooleanNode;
}
else if (SelectedExpression is BooleanOperatorNode &&
((BooleanOperatorNode)SelectedExpression).Operator != BooleanOperators.Not &&
SelectedExpression.Left == null)
{
//Adding to existing node
SelectedExpression.Left = compariosonNode;
SelectedFilterConfiguration.Conditions.Root = SelectedFilterConfiguration.Conditions.Root.Clone() as ExpressionTreeNode;
}
else if (SelectedExpression.Parent is BooleanOperatorNode &&
((BooleanOperatorNode)SelectedExpression.Parent).Operator != BooleanOperators.Not &&
SelectedExpression.Parent.Left == null)
{
//Adding to existing node
SelectedExpression.Parent.Left = compariosonNode;
SelectedFilterConfiguration.Conditions.Root = SelectedFilterConfiguration.Conditions.Root.Clone() as ExpressionTreeNode;
}
else
{
//Adding to arbitrary node
bool isParentNull = SelectedExpression.Parent == null;
bool isSelectedBoolNode = SelectedExpression is BooleanOperatorNode;
ExpressionTreeElement leftExpession;
ExpressionTreeElement rightExpression;
if (isSelectedBoolNode)
{
leftExpession = SelectedExpression.Right;
}
else if (isParentNull)
{
leftExpession = SelectedExpression;
}
else
{
leftExpession = SelectedExpression.Parent.Right;
}
if (leftExpession is BooleanOperatorNode)
{
rightExpression = leftExpession;
leftExpession = compariosonNode;
}
else
{
rightExpression = compariosonNode;
}
var newBoolNode =
new BooleanOperatorNode(
SelectedExpression.Parent,
leftExpession != null ? (leftExpession.Clone() as ExpressionTreeElement) : null,
rightExpression.Clone() as ExpressionTreeElement,
BooleanOperators.And);
if (isParentNull &&
!isSelectedBoolNode)
{
SelectedFilterConfiguration.Conditions.Root = newBoolNode;
}
else
{
Trace.WriteLine("Before adding to SelectedExpression.Parent\r\n"
+ SelectedExpression.Parent);
if (isSelectedBoolNode)
{
SelectedExpression.Right = newBoolNode;
}
else
{
SelectedExpression.Parent.Right = newBoolNode;
}
Trace.WriteLine("After adding to SelectedExpression.Parent\r\n"
+ SelectedExpression.Parent);
SelectedFilterConfiguration.Conditions.Root = SelectedFilterConfiguration.Conditions.Root.Clone() as ExpressionTreeNode;
}
Trace.WriteLine("Final expression after adding\r\n"
+ SelectedFilterConfiguration.Conditions.Root);
}
}
if (SelectedFilterConfiguration.Conditions.Root != null)
{
Task.Run(() =>
{
Thread.Sleep(100);
Application.Current.Dispatcher.Invoke(() =>
SelectedExpression = SelectedFilterConfiguration.Conditions.Root.Find(compariosonNode) as ExpressionTreeNode);
});
}
else
{
SelectedExpression = null;
}
}
/// <summary>
/// Получить строковое выражение фильтрации
/// </summary>
/// <param name="filterElement">Параметры фильтра</param>
/// <param name="filterablePropertyDescription">Описание свойств фильтрации</param>
/// <returns>Строковое выражение фильтрации</returns>
private string GetStringFilteringConditions(ExpressionTreeElement filterElement, FilterablePropertyDescriptionCollection filterablePropertyDescription)
{
var fieldLeaf = filterElement as ExpressionTreeFieldLeaf;
if (fieldLeaf != null)
{
var foundFieldDescr =
filterablePropertyDescription.FirstOrDefault(
prop => prop.BoundProperty.Equals(fieldLeaf.PropertyDescription));
if (foundFieldDescr != null)
{
return(foundFieldDescr.Title);
}
}
var valueLeaf = filterElement as ExpressionTreeValueLeaf;
if (valueLeaf != null)
{
var fieldForValue = filterElement.Parent.Left as ExpressionTreeFieldLeaf;
if (fieldForValue != null)
{
var foundFieldDescr =
filterablePropertyDescription.FirstOrDefault(
prop => prop.BoundProperty.Equals(fieldForValue.PropertyDescription));
if (foundFieldDescr != null &&
foundFieldDescr.ValueToStringConverter != null)
{
return(foundFieldDescr.ValueToStringConverter.Convert(valueLeaf.FieldValue,
valueLeaf.FieldValue.GetType(), null, CultureInfo.CurrentCulture).ToString());
}
}
if (valueLeaf.FieldValue is string)
{
return("\"" + valueLeaf.FieldValue + "\"");
}
if (valueLeaf.FieldValue is DateTime)
{
return("\"" + ((DateTime)valueLeaf.FieldValue).ToString(CultureInfo.CurrentCulture) + "\"");
}
if (valueLeaf.FieldValue == null)
{
return(LocalizationDictionary.Empty);
}
else
{
return(valueLeaf.FieldValue.ToString());
}
}
var comparisonNode = filterElement as ComparisonOperatorNode;
if (comparisonNode != null)
{
if (comparisonNode.Right is ExpressionTreeValueLeaf)
{
if (((ExpressionTreeValueLeaf)comparisonNode.Right).FieldValue == null ||
(((ExpressionTreeValueLeaf)comparisonNode.Right).FieldValue is String &&
String.IsNullOrEmpty(((ExpressionTreeValueLeaf)comparisonNode.Right).FieldValue as String)))
{
return(GetStringFilteringConditions(comparisonNode.Left, filterablePropertyDescription)
+ " " + ComparisonOperatorNode.OperatorToString(comparisonNode.Operator) + " "
+ LocalizationDictionary.Empty);
}
return(GetStringFilteringConditions(comparisonNode.Left, filterablePropertyDescription)
+ " " + ComparisonOperatorNode.OperatorToString(comparisonNode.Operator) + " "
+ GetStringFilteringConditions(comparisonNode.Right, filterablePropertyDescription));
}
}
var booleanNode = filterElement as BooleanOperatorNode;
if (booleanNode != null)
{
var boolOperatorItemsSource = new LocalizableEnumItemsSource {
Type = typeof(BooleanOperators)
};
if (booleanNode.Operator == BooleanOperators.Not)
{
return(boolOperatorItemsSource.Convert(booleanNode.Operator, null, null, null) + " "
+ (booleanNode.Left is BooleanOperatorNode ? "( " : String.Empty)
+ GetStringFilteringConditions(booleanNode.Left, filterablePropertyDescription)
+ (booleanNode.Left is BooleanOperatorNode ? " )" : String.Empty));
}
return(GetStringFilteringConditions(booleanNode.Left, filterablePropertyDescription)
+ " " + boolOperatorItemsSource.Convert(booleanNode.Operator, null, null, null) + " "
+ GetStringFilteringConditions(booleanNode.Right, filterablePropertyDescription));
}
return(String.Empty);
}