/// <summary>
/// Visits the given query.
/// </summary>
/// <param name="query">Query to visit.</param>
/// <returns>Either the same or a different query.</returns>
protected virtual Query Visit(Query query)
{
Query ret = query;
QueryNode visited = null;
bool nodesChanged = false;
List<QueryNode> nodes = new List<QueryNode>();
if (query != null)
{
if (query.Nodes.Any())
{
foreach (QueryNode n in query.Nodes)
{
if (n != null)
{
visited = VisitNode(n);
if (visited != null)
nodes.Add(visited);
else
nodesChanged = true;
}
else
nodesChanged = true;
}
if (!nodesChanged)
{
nodesChanged = nodes.Count != query.Nodes.Count;
if (!nodesChanged)
{
for (int i = 0; i < nodes.Count; i++)
{
nodesChanged = nodes[i] != query.Nodes[i];
if (nodesChanged)
break;
}
}
}
if (nodesChanged)
ret = new Query(nodes);
}
}
return ret;
}
/// <summary>
/// Parses the query from the higher level representation.
/// </summary>
/// <returns>Parsed query.</returns>
public static Query Parse(SearchQuery query)
{
int currentCount = 0;
Queries.Query ret = null;
string[] valueComponents = null;
object v = null, lb = null, ub = null;
List<object> values = new List<object>();
List<Queries.QueryNode> nodes = new List<Queries.QueryNode>();
if (query != null && query.Criteria != null)
{
foreach (Criterion c in query.Criteria.Where(cr => cr != null && !string.IsNullOrWhiteSpace(cr.Value)))
{
currentCount = nodes.Count;
if (string.IsNullOrWhiteSpace(c.Name))
nodes.Add(new Queries.LiteralQueryNode(c.Value));
else
{
if (c.Value.Trim().IndexOf(' ') > 0)
{
v = GetValue(c.Value);
if (v != null)
nodes.Add(new Queries.SingleValueParameterQueryNode(c.Name, v));
}
else
{
valueComponents = c.Value.Split(new char[] { '-' }, System.StringSplitOptions.RemoveEmptyEntries);
if (valueComponents != null && valueComponents.Length == 2 && c.Value.IndexOf(',') < 0 &&
c.Value.Where(s => s == '-').Count() == 1 && string.Compare(c.Name ?? string.Empty, "tags", System.StringComparison.InvariantCultureIgnoreCase) != 0)
{
lb = null;
ub = null;
if (string.Compare((valueComponents[0] ?? string.Empty).Trim(), "*") != 0)
lb = GetValue(valueComponents[0]);
if (string.Compare((valueComponents[1] ?? string.Empty).Trim(), "*") != 0)
ub = GetValue(valueComponents[1]);
if (lb != null || ub != null)
nodes.Add(new Queries.RangeParameterQueryNode(c.Name, lb, ub));
}
if (currentCount == nodes.Count)
{
valueComponents = c.Value.Split(new char[] { ',' }, System.StringSplitOptions.RemoveEmptyEntries);
if (valueComponents != null && valueComponents.Length > 1 &&
string.Compare(c.Name ?? string.Empty, "location", System.StringComparison.InvariantCultureIgnoreCase) != 0)
{
values.Clear();
foreach (string vc in valueComponents)
{
v = GetValue(vc);
if (v != null)
values.Add(v);
}
if (values.Any())
nodes.Add(new Queries.ListParameterQueryNode(c.Name, values));
}
if (currentCount == nodes.Count)
{
v = GetValue(c.Value);
if (v != null)
nodes.Add(new Queries.SingleValueParameterQueryNode(c.Name, v));
}
}
}
}
}
}
if (nodes.Any())
ret = new Query(nodes);
return ret;
}