private Condition GetRelationCondition(string relation, BinaryExpression node)
{
var leftVisitor = new BinaryExpressionVisitor(this.Context);
leftVisitor.Visit(node.Left);
var rightVisitor = new BinaryExpressionVisitor(this.Context);
rightVisitor.Visit(node.Right);
if (leftVisitor.Column != null && rightVisitor.Column != null)
{
var condition = new SingleCondition();
condition.Left = leftVisitor.Column;
condition.Right = rightVisitor.Column;
condition.Relation = relation;
return(condition);
}
var group = new GroupCondition();
group.Left = leftVisitor.Condition ?? new SingleCondition()
{
Right = leftVisitor.Column
};
group.Right = rightVisitor.Condition ?? new SingleCondition()
{
Right = rightVisitor.Column
};
group.Relation = relation;
return(group);
}
protected override Expression VisitBinary(BinaryExpression node)
{
var visitor = new BinaryExpressionVisitor(context);
visitor.Visit(node);
return(node);
}
protected override Expression VisitBinary(BinaryExpression node)
{
switch (node.NodeType)
{
case ExpressionType.AndAlso:
this.Condition = GetRelationCondition(" and ", node);
break;
case ExpressionType.OrElse:
this.Condition = GetRelationCondition(" or ", node);
break;
default:
var visitor = new BinaryExpressionVisitor(this.Context);
visitor.Visit(node);
this.Condition = visitor.Condition;
break;
}
return(node);
}
private Condition GetRelationCondition(string relation, BinaryExpression node)
{
var leftVisitor = new BinaryExpressionVisitor(this.Context);
leftVisitor.Visit(node.Left);
var rightVisitor = new BinaryExpressionVisitor(this.Context);
rightVisitor.Visit(node.Right);
if (leftVisitor.Column != null && rightVisitor.Column != null)
{
var condition = new SingleCondition();
condition.Left = leftVisitor.Column;
condition.Right = rightVisitor.Column;
condition.Relation = relation;
return condition;
}
var group = new GroupCondition();
group.Left = leftVisitor.Condition ?? new SingleCondition() { Right = leftVisitor.Column };
group.Right = rightVisitor.Condition ?? new SingleCondition() { Right = rightVisitor.Column };
group.Relation = relation;
return group;
}