/**
* Converts the original query string to a collection of Lucene Tokens.
* @param original the original query string
* @return a Collection of Lucene Tokens
*/
public override Collection /*<Token>*/ convert(string original)
{
if (original == null) // this can happen with q.alt = and no query
{
return(Collections.emptyList());
}
Collection /*<Token>*/ result = new ArrayList/*<Token>*/ ();
//TODO: Extract the words using a simple regex, but not query stuff, and then analyze them to produce the token stream
Matcher matcher = QUERY_REGEX.matcher(original);
TokenStream stream;
while (matcher.find())
{
string word = matcher.group(0);
if (word.Equals("AND") == false && word.Equals("OR") == false)
{
try {
stream = analyzer.reusableTokenStream("", new StringReader(word));
// TODO: support custom attributes
TermAttribute termAtt = (TermAttribute)stream.addAttribute(typeof(TermAttribute));
FlagsAttribute flagsAtt = (FlagsAttribute)stream.addAttribute(typeof(FlagsAttribute));
TypeAttribute typeAtt = (TypeAttribute)stream.addAttribute(typeof(TypeAttribute));
PayloadAttribute payloadAtt = (PayloadAttribute)stream.addAttribute(typeof(PayloadAttribute));
PositionIncrementAttribute posIncAtt = (PositionIncrementAttribute)stream.addAttribute(typeof(PositionIncrementAttribute));
stream.reset();
while (stream.incrementToken())
{
Token token = new Token();
token.setTermBuffer(termAtt.termBuffer(), 0, termAtt.termLength());
token.setStartOffset(matcher.start());
token.setEndOffset(matcher.end());
token.setFlags(flagsAtt.getFlags());
token.setType(typeAtt.type());
token.setPayload(payloadAtt.getPayload());
token.setPositionIncrement(posIncAtt.getPositionIncrement());
result.add(token);
}
}
#pragma warning disable 168
catch (IOException e)
{
}
#pragma warning restore 168
}
}
return(result);
}
public PrefixAwareTokenFilter(TokenStream prefix, TokenStream suffix) : base(suffix)
{
this.suffix = suffix;
this.prefix = prefix;
prefixExhausted = false;
termAtt = addAttribute(typeof(CharTermAttribute));
posIncrAtt = addAttribute(typeof(PositionIncrementAttribute));
payloadAtt = addAttribute(typeof(PayloadAttribute));
offsetAtt = addAttribute(typeof(OffsetAttribute));
typeAtt = addAttribute(typeof(TypeAttribute));
flagsAtt = addAttribute(typeof(FlagsAttribute));
p_termAtt = prefix.addAttribute(typeof(CharTermAttribute));
p_posIncrAtt = prefix.addAttribute(typeof(PositionIncrementAttribute));
p_payloadAtt = prefix.addAttribute(typeof(PayloadAttribute));
p_offsetAtt = prefix.addAttribute(typeof(OffsetAttribute));
p_typeAtt = prefix.addAttribute(typeof(TypeAttribute));
p_flagsAtt = prefix.addAttribute(typeof(FlagsAttribute));
}
public PrefixAwareTokenFilter(TokenStream prefix, TokenStream suffix) : base(suffix)
{
this.suffix = suffix;
this.prefix = prefix;
prefixExhausted = false;
termAtt = addAttribute(typeof(CharTermAttribute));
posIncrAtt = addAttribute(typeof(PositionIncrementAttribute));
payloadAtt = addAttribute(typeof(PayloadAttribute));
offsetAtt = addAttribute(typeof(OffsetAttribute));
typeAtt = addAttribute(typeof(TypeAttribute));
flagsAtt = addAttribute(typeof(FlagsAttribute));
p_termAtt = prefix.addAttribute(typeof(CharTermAttribute));
p_posIncrAtt = prefix.addAttribute(typeof(PositionIncrementAttribute));
p_payloadAtt = prefix.addAttribute(typeof(PayloadAttribute));
p_offsetAtt = prefix.addAttribute(typeof(OffsetAttribute));
p_typeAtt = prefix.addAttribute(typeof(TypeAttribute));
p_flagsAtt = prefix.addAttribute(typeof(FlagsAttribute));
}
