Wolfgang.
/**
* Convenience method; Creates and returns a token stream that generates a
* token for each keyword in the given collection, "as is", without any
* transforming text analysis. The resulting token stream can be fed into
* [EMAIL PROTECTED] #addField(String, TokenStream)}, perhaps wrapped into another
* [EMAIL PROTECTED] org.apache.lucene.analysis.TokenFilter}, as desired.
*
* @param keywords
* the keywords to generate tokens for
* @return the corresponding token stream
*/
public TokenStream keywordTokenStream(final Collection keywords) {
if (keywords == null)
throw new IllegalArgumentException("keywords must not be null");
return new TokenStream() {
Iterator iter = keywords.iterator();
int pos = 0;
int start = 0;
public Token next() {
if (!iter.hasNext()) return null;
Object obj = iter.next();
if (obj == null)
throw new IllegalArgumentException("keyword must not be null");
String term = obj.toString();
Token token = new Token(term, start, start + term.length());
start += term.length() + 1; // separate words by 1 (blank) character
pos++;
return token;
}
};
}
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