FieldQueryNode fieldNode = ((FieldQueryNode) node);
String text = fieldNode.getTextAsString();
String field = fieldNode.getFieldAsString();
CachingTokenFilter buffer = null;
PositionIncrementAttribute posIncrAtt = null;
int numTokens = 0;
int positionCount = 0;
boolean severalTokensAtSamePosition = false;
TokenStream source = null;
try {
source = this.analyzer.tokenStream(field, text);
source.reset();
buffer = new CachingTokenFilter(source);
if (buffer.hasAttribute(PositionIncrementAttribute.class)) {
posIncrAtt = buffer.getAttribute(PositionIncrementAttribute.class);
}
try {
while (buffer.incrementToken()) {
numTokens++;
int positionIncrement = (posIncrAtt != null) ? posIncrAtt
.getPositionIncrement() : 1;
if (positionIncrement != 0) {
positionCount += positionIncrement;
} else {
severalTokensAtSamePosition = true;
}
}
} catch (IOException e) {
// ignore
}
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
IOUtils.closeWhileHandlingException(source);
}
// rewind the buffer stream
buffer.reset();
if (!buffer.hasAttribute(CharTermAttribute.class)) {
return new NoTokenFoundQueryNode();
}
CharTermAttribute termAtt = buffer.getAttribute(CharTermAttribute.class);
if (numTokens == 0) {
return new NoTokenFoundQueryNode();
} else if (numTokens == 1) {
String term = null;
try {
boolean hasNext;
hasNext = buffer.incrementToken();
assert hasNext == true;
term = termAtt.toString();
} catch (IOException e) {
// safe to ignore, because we know the number of tokens
}
fieldNode.setText(term);
return fieldNode;
} else if (severalTokensAtSamePosition || !(node instanceof QuotedFieldQueryNode)) {
if (positionCount == 1 || !(node instanceof QuotedFieldQueryNode)) {
// no phrase query:
if (positionCount == 1) {
// simple case: only one position, with synonyms
LinkedList<QueryNode> children = new LinkedList<QueryNode>();
for (int i = 0; i < numTokens; i++) {
String term = null;
try {
boolean hasNext = buffer.incrementToken();
assert hasNext == true;
term = termAtt.toString();
} catch (IOException e) {
// 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
QueryNode q = new StandardBooleanQueryNode(Collections.<QueryNode>emptyList(),false);
QueryNode currentQuery = null;
for (int i = 0; i < numTokens; i++) {
String term = null;
try {
boolean hasNext = buffer.incrementToken();
assert hasNext == true;
term = termAtt.toString();
} catch (IOException e) {
// safe to ignore, because we know the number of tokens
}
if (posIncrAtt != null && posIncrAtt.getPositionIncrement() == 0) {
if (!(currentQuery instanceof BooleanQueryNode)) {
QueryNode t = currentQuery;
currentQuery = new StandardBooleanQueryNode(Collections.<QueryNode>emptyList(), 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 instanceof BooleanQueryNode) {
q = new GroupQueryNode(q);
}
return q;
}
} else {
// phrase query:
MultiPhraseQueryNode mpq = new MultiPhraseQueryNode();
List<FieldQueryNode> multiTerms = new ArrayList<FieldQueryNode>();
int position = -1;
int i = 0;
int termGroupCount = 0;
for (; i < numTokens; i++) {
String term = null;
int positionIncrement = 1;
try {
boolean hasNext = buffer.incrementToken();
assert hasNext == true;
term = termAtt.toString();
if (posIncrAtt != null) {
positionIncrement = posIncrAtt.getPositionIncrement();
}
} catch (IOException e) {
// safe to ignore, because we know the number of tokens
}
if (positionIncrement > 0 && multiTerms.size() > 0) {
for (FieldQueryNode termNode : multiTerms) {
if (this.positionIncrementsEnabled) {
termNode.setPositionIncrement(position);
} else {
termNode.setPositionIncrement(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));
}
for (FieldQueryNode termNode : multiTerms) {
if (this.positionIncrementsEnabled) {
termNode.setPositionIncrement(position);
} else {
termNode.setPositionIncrement(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 {
boolean hasNext = buffer.incrementToken();
assert hasNext == true;
term = termAtt.toString();
if (posIncrAtt != null) {
positionIncrement = posIncrAtt.getPositionIncrement();
}
} catch (IOException e) {
// safe to ignore, because we know the number of tokens
}