public static List <RqlNode> ExtractAggregates(RqlNode node)
{
if (node == null)
{
return(null);
}
var result = new List <RqlNode>();
if (node.NodeType == RqlNodeType.AND)
{
foreach (var child in node.Value <List <RqlNode> >())
{
result.AddRange(ExtractAggregates(child));
}
}
else if (node.NodeType == RqlNodeType.OR)
{
foreach (var child in node.Value <List <RqlNode> >())
{
result.AddRange(ExtractAggregates(child));
}
}
else if (node.NodeType == RqlNodeType.SUM)
{
return(new List <RqlNode>()
{
node
});
}
else if (node.NodeType == RqlNodeType.MIN)
{
return(new List <RqlNode>()
{
node
});
}
else if (node.NodeType == RqlNodeType.MAX)
{
return(new List <RqlNode>()
{
node
});
}
else if (node.NodeType == RqlNodeType.MEAN)
{
return(new List <RqlNode>()
{
node
});
}
return(result);
}
/// <summary>
/// Extract a Clause from the compiled RQL Query
/// </summary>
/// <param name="type"></param>
/// <param name="node"></param>
/// <returns></returns>
public static RqlNode ExtractClause(RqlNodeType type, RqlNode node)
{
if (node == null)
{
return(null);
}
if (node.NodeType == RqlNodeType.AND)
{
foreach (var child in node.Value <List <RqlNode> >())
{
var clause = ExtractClause(type, child);
if (clause != null)
{
return(clause);
}
}
}
else if (node.NodeType == RqlNodeType.OR)
{
foreach (var child in node.Value <List <RqlNode> >())
{
var clause = ExtractClause(type, child);
if (clause != null)
{
return(clause);
}
}
}
else if (node.NodeType == type)
{
return(node);
}
return(null);
}
/// <summary>
/// Replaces a clause with a new one in place
/// </summary>
/// <param name="type"></param>
/// <param name="node"></param>
/// <param name="replacement"></param>
/// <returns></returns>
public static RqlNode ReplaceClause(RqlNodeType type, RqlNode node, RqlNode replacement)
{
if (node.NodeType == RqlNodeType.AND)
{
for (int i = 0; i < node.Value <List <RqlNode> >().Count; i++)
{
node.SetValue <RqlNode>(i, ReplaceClause(type, node.Value <RqlNode>(i), replacement));
}
}
else if (node.NodeType == RqlNodeType.OR)
{
for (int i = 0; i < node.Value <List <RqlNode> >().Count; i++)
{
node.SetValue <RqlNode>(i, ReplaceClause(type, node.Value <RqlNode>(i), replacement));
}
}
else if (node.NodeType == type)
{
return(replacement);
}
return(node);
}