protected override IQueryNode PostProcessNode(IQueryNode node)
{
// the old Lucene Parser ignores FuzzyQueryNode that are also PrefixWildcardQueryNode or WildcardQueryNode
// we do the same here, also ignore empty terms
if (node is FieldQueryNode || node is FuzzyQueryNode)
{
FieldQueryNode fqn = (FieldQueryNode)node;
string text = fqn.Text.ToString();
// do not process wildcards for TermRangeQueryNode children and
// QuotedFieldQueryNode to reproduce the old parser behavior
if (fqn.Parent is TermRangeQueryNode ||
fqn is QuotedFieldQueryNode ||
text.Length <= 0)
{
// Ignore empty terms
return(node);
}
// Code below simulates the old lucene parser behavior for wildcards
if (IsPrefixWildcard(text))
{
PrefixWildcardQueryNode prefixWildcardQN = new PrefixWildcardQueryNode(fqn);
return(prefixWildcardQN);
}
else if (IsWildcard(text))
{
WildcardQueryNode wildcardQN = new WildcardQueryNode(fqn);
return(wildcardQN);
}
}
return(node);
}
protected override IQueryNode PostProcessNode(IQueryNode node)
{
if (node is WildcardQueryNode)
{
WildcardQueryNode wildcardNode = (WildcardQueryNode)node;
if (wildcardNode.Text.Length > 0)
{
// Validate if the wildcard was escaped
if (UnescapedCharSequence.WasEscaped(wildcardNode.Text, 0))
{
return(node);
}
switch (wildcardNode.Text[0])
{
case '*':
case '?':
throw new QueryNodeException(new Message(
QueryParserMessages.LEADING_WILDCARD_NOT_ALLOWED, node
.ToQueryString(new EscapeQuerySyntax())));
}
}
}
return(node);
}
public virtual Query Build(IQueryNode queryNode)
{
WildcardQueryNode wildcardNode = (WildcardQueryNode)queryNode;
WildcardQuery q = new WildcardQuery(new Term(wildcardNode.GetFieldAsString(),
wildcardNode.GetTextAsString()));
MultiTermQuery.RewriteMethod method = (MultiTermQuery.RewriteMethod)queryNode.GetTag(MultiTermRewriteMethodProcessor.TAG_ID);
if (method != null)
{
q.MultiTermRewriteMethod = method;
}
return(q);
}