protected override IQueryNode PostProcessNode(IQueryNode node)
{
if (node is ITextableQueryNode
&& !(node is WildcardQueryNode)
&& !(node is FuzzyQueryNode)
&& !(node is RegexpQueryNode)
&& !(node.Parent is IRangeQueryNode))
{
FieldQueryNode fieldNode = ((FieldQueryNode)node);
string text = fieldNode.GetTextAsString();
string field = fieldNode.GetFieldAsString();
CachingTokenFilter buffer = null;
IPositionIncrementAttribute posIncrAtt = null;
int numTokens = 0;
int positionCount = 0;
bool severalTokensAtSamePosition = false;
TokenStream source = null;
try
{
source = this.analyzer.TokenStream(field, text);
source.Reset();
buffer = new CachingTokenFilter(source);
if (buffer.HasAttribute<IPositionIncrementAttribute>())
{
posIncrAtt = buffer.GetAttribute<IPositionIncrementAttribute>();
}
try
{
while (buffer.IncrementToken())
{
numTokens++;
int positionIncrement = (posIncrAtt != null) ? posIncrAtt
.PositionIncrement : 1;
if (positionIncrement != 0)
{
positionCount += positionIncrement;
}
else
{
severalTokensAtSamePosition = true;
}
}
}
#pragma warning disable 168
catch (IOException e)
#pragma warning restore 168
{
// ignore
}
}
catch (IOException e)
{
throw new Exception(e.Message, e);
}
finally
{
IOUtils.CloseWhileHandlingException(source);
}
// rewind the buffer stream
buffer.Reset();
if (!buffer.HasAttribute<ICharTermAttribute>())
{
return new NoTokenFoundQueryNode();
}
ICharTermAttribute termAtt = buffer.GetAttribute<ICharTermAttribute>();
if (numTokens == 0)
{
return new NoTokenFoundQueryNode();
}
else if (numTokens == 1)
{
string term = null;
try
{
bool hasNext;
hasNext = buffer.IncrementToken();
Debug.Assert(hasNext == true);
term = termAtt.ToString();
}
#pragma warning disable 168
catch (IOException e)
#pragma warning restore 168
{
// safe to ignore, because we know the number of tokens
}
fieldNode.Text = term.ToCharSequence();
return fieldNode;
}
else if (severalTokensAtSamePosition || !(node is QuotedFieldQueryNode))
{
if (positionCount == 1 || !(node is QuotedFieldQueryNode))
{
// no phrase query:
if (positionCount == 1)
{
// simple case: only one position, with synonyms
List<IQueryNode> children = new List<IQueryNode>();
for (int i = 0; i < numTokens; i++)
{
string term = null;
try
{
bool hasNext = buffer.IncrementToken();
Debug.Assert(hasNext == true);
term = termAtt.ToString();
}
#pragma warning disable 168
catch (IOException e)
#pragma warning restore 168
{
// safe to ignore, because we know the number of tokens
}
children.Add(new FieldQueryNode(field, term, -1, -1));
}
return new GroupQueryNode(
new StandardBooleanQueryNode(children, positionCount == 1));
}
else
{
// multiple positions
IQueryNode q = new StandardBooleanQueryNode(new List<IQueryNode>(), false);
IQueryNode currentQuery = null;
for (int i = 0; i < numTokens; i++)
{
string term = null;
try
{
bool hasNext = buffer.IncrementToken();
Debug.Assert(hasNext == true);
term = termAtt.ToString();
}
#pragma warning disable 168
catch (IOException e)
#pragma warning restore 168
{
// safe to ignore, because we know the number of tokens
}
if (posIncrAtt != null && posIncrAtt.PositionIncrement == 0)
{
if (!(currentQuery is BooleanQueryNode))
{
IQueryNode t = currentQuery;
currentQuery = new StandardBooleanQueryNode(new List<IQueryNode>(), true);
((BooleanQueryNode)currentQuery).Add(t);
}
((BooleanQueryNode)currentQuery).Add(new FieldQueryNode(field, term, -1, -1));
}
else
{
if (currentQuery != null)
{
if (this.defaultOperator == Operator.OR)
{
q.Add(currentQuery);
}
else
{
q.Add(new ModifierQueryNode(currentQuery, Modifier.MOD_REQ));
}
}
currentQuery = new FieldQueryNode(field, term, -1, -1);
}
}
if (this.defaultOperator == Operator.OR)
{
q.Add(currentQuery);
}
else
{
q.Add(new ModifierQueryNode(currentQuery, Modifier.MOD_REQ));
}
if (q is BooleanQueryNode)
{
q = new GroupQueryNode(q);
}
return q;
}
}
else
{
// phrase query:
MultiPhraseQueryNode mpq = new MultiPhraseQueryNode();
List<FieldQueryNode> multiTerms = new List<FieldQueryNode>();
int position = -1;
int i = 0;
int termGroupCount = 0;
for (; i < numTokens; i++)
{
string term = null;
int positionIncrement = 1;
try
{
bool hasNext = buffer.IncrementToken();
Debug.Assert(hasNext == true);
term = termAtt.ToString();
if (posIncrAtt != null)
{
positionIncrement = posIncrAtt.PositionIncrement;
}
}
#pragma warning disable 168
catch (IOException e)
#pragma warning restore 168
{
// safe to ignore, because we know the number of tokens
}
if (positionIncrement > 0 && multiTerms.Count > 0)
{
foreach (FieldQueryNode termNode in multiTerms)
{
if (this.positionIncrementsEnabled)
{
termNode.PositionIncrement = position;
}
else
{
termNode.PositionIncrement = termGroupCount;
}
mpq.Add(termNode);
}
// Only increment once for each "group" of
// terms that were in the same position:
termGroupCount++;
multiTerms.Clear();
}
position += positionIncrement;
multiTerms.Add(new FieldQueryNode(field, term, -1, -1));
}
foreach (FieldQueryNode termNode in multiTerms)
{
if (this.positionIncrementsEnabled)
{
termNode.PositionIncrement = position;
}
else
{
termNode.PositionIncrement = termGroupCount;
}
mpq.Add(termNode);
}
return mpq;
}
}
else
{
TokenizedPhraseQueryNode pq = new TokenizedPhraseQueryNode();
int position = -1;
for (int i = 0; i < numTokens; i++)
{
string term = null;
int positionIncrement = 1;
try
{
bool hasNext = buffer.IncrementToken();
Debug.Assert(hasNext == true);
term = termAtt.ToString();
if (posIncrAtt != null)
{
positionIncrement = posIncrAtt.PositionIncrement;
}
}
#pragma warning disable 168
catch (IOException e)
#pragma warning restore 168
{
// safe to ignore, because we know the number of tokens
}
FieldQueryNode newFieldNode = new FieldQueryNode(field, term, -1, -1);
if (this.positionIncrementsEnabled)
{
position += positionIncrement;
newFieldNode.PositionIncrement = position;
}
else
{
newFieldNode.PositionIncrement = i;
}
pq.Add(newFieldNode);
}
return pq;
}
}
return node;
}