protected override Expression VisitMember(MemberExpression node)
{
PropertyInfo propertyInfo = node.Member as PropertyInfo;
if (propertyInfo != null)
{
// get property with JqlFieldAttribute
var attributes = propertyInfo.GetCustomAttributes(typeof(JqlFieldAttribute), true);
JqlFieldAttribute field = attributes[0] as JqlFieldAttribute;
this.jql.Append(field.Name);
}
else
{
LambdaExpression lambda = Expression.Lambda(node);
Delegate fn = lambda.Compile();
Expression expression = Expression.Constant(fn.DynamicInvoke(null));
Visit(expression);
}
return(node);
}
protected override Expression VisitBinary(BinaryExpression node)
{
ConstantExpression rightExpression = null;
JqlFieldAttribute field = null;
switch (node.NodeType)
{
case ExpressionType.And:
case ExpressionType.AndAlso:
this.jql.Append("(");
this.Visit(node.Left);
this.jql.Append(" AND ");
this.Visit(node.Right);
this.jql.Append(")");
break;
case ExpressionType.Or:
case ExpressionType.OrElse:
this.jql.Append("(");
this.Visit(node.Left);
this.jql.Append(" OR");
this.Visit(node.Right);
this.jql.Append(")");
break;
case ExpressionType.Equal:
field = GetFieldInfo(node.Left);
this.jql.Append(field.Name);
if (node.Right.NodeType == ExpressionType.Convert)
{
UnaryExpression unaryExpression = node.Right as UnaryExpression;
rightExpression = unaryExpression.Operand as ConstantExpression;
}
else
{
rightExpression = node.Right as ConstantExpression;
}
if (rightExpression != null && rightExpression.Value == null && rightExpression.Type == typeof(DateTime?))
{
this.jql.Append(" is empty");
}
else if (rightExpression != null && rightExpression.Value == null)
{
this.jql.Append(" is null");
}
else if (rightExpression != null && rightExpression.Value.GetType() == typeof(string) && ((string)rightExpression.Value) == "")
{
this.jql.Append(" is empty");
}
else
{
if ((field.Compare & JqlFieldCompare.Contains) == JqlFieldCompare.Contains)
{
this.jql.Append(" ~ ");
}
else
{
this.jql.Append(" = ");
}
this.Visit(node.Right);
}
break;
case ExpressionType.NotEqual:
field = GetFieldInfo(node.Left);
this.jql.Append(field.Name);
if (node.Right.NodeType == ExpressionType.Convert)
{
UnaryExpression unaryExpression = node.Right as UnaryExpression;
rightExpression = unaryExpression.Operand as ConstantExpression;
}
else
{
rightExpression = node.Right as ConstantExpression;
}
if (rightExpression != null && rightExpression.Value == null && rightExpression.Type == typeof(DateTime?))
{
this.jql.Append(" is not empty");
}
else if (rightExpression != null && rightExpression.Value == null)
{
this.jql.Append(" is not null");
}
else if (rightExpression != null && rightExpression.Value.GetType() == typeof(string) && ((string)rightExpression.Value) == "")
{
this.jql.Append(" is not empty");
}
else
{
if ((field.Compare & JqlFieldCompare.Contains) == JqlFieldCompare.Contains)
{
this.jql.Append(" !~ ");
}
else
{
this.jql.Append(" != ");
}
this.Visit(node.Right);
}
break;
case ExpressionType.LessThan:
this.Visit(node.Left);
this.jql.Append(" < ");
this.Visit(node.Right);
break;
case ExpressionType.LessThanOrEqual:
this.Visit(node.Left);
this.jql.Append(" <= ");
this.Visit(node.Right);
break;
case ExpressionType.GreaterThan:
this.Visit(node.Left);
this.jql.Append(" > ");
this.Visit(node.Right);
break;
case ExpressionType.GreaterThanOrEqual:
this.Visit(node.Left);
this.jql.Append(" >= ");
this.Visit(node.Right);
break;
default:
throw new NotSupportedException(string.Format("The binary operator '{0}' is not supported", node.NodeType));
}
return(node);
}
