import org.apache.lucene.search.PrefixTermsEnum; //导入依赖的package包/类
/** Return a {@link TermsEnum} intersecting the provided {@link Terms}
 *  with the terms accepted by this automaton. */
public TermsEnum getTermsEnum(Terms terms) throws IOException {
  switch(type) {
  case NONE:
    return TermsEnum.EMPTY;
  case ALL:
    return terms.iterator(null);
  case SINGLE:
    return new SingleTermsEnum(terms.iterator(null), term);
  case PREFIX:
    // TODO: this is very likely faster than .intersect,
    // but we should test and maybe cutover
    return new PrefixTermsEnum(terms.iterator(null), term);
  case NORMAL:
    return terms.intersect(this, null);
  default:
    // unreachable
    throw new RuntimeException("unhandled case");
  }
}
 

import org.apache.lucene.search.PrefixTermsEnum; //导入依赖的package包/类
public TermsEnum getTermsEnum(Terms terms) throws IOException {
  switch(type) {
  case NONE:
    return TermsEnum.EMPTY;
  case ALL:
    return terms.iterator(null);
  case SINGLE:
    return new SingleTermsEnum(terms.iterator(null), term);
  case PREFIX:
    // TODO: this is very likely faster than .intersect,
    // but we should test and maybe cutover
    return new PrefixTermsEnum(terms.iterator(null), term);
  case NORMAL:
    return terms.intersect(this, null);
  default:
    // unreachable
    throw new RuntimeException("unhandled case");
  }
}
 

import org.apache.lucene.search.PrefixTermsEnum; //导入依赖的package包/类
private Suggest.Suggestion.Entry<Suggest.Suggestion.Entry.Option> getOptions(Term text, PrefixTermsEnum prefixTermsEnum, IndexReader indexReader, final int size) throws IOException {
    OptionQueue collectionQueue =  new OptionQueue(size);
    BytesRef ref;
    while ((ref = prefixTermsEnum.next()) != null) {
        Term term = new Term(text.field(), BytesRef.deepCopyOf(ref));
        collectionQueue.insertWithOverflow(new Suggest.Suggestion.Entry.Option(new StringText(term.bytes().utf8ToString()), indexReader.docFreq(term)));
    }

    Suggest.Suggestion.Entry<Suggest.Suggestion.Entry.Option> entry = new Suggest.Suggestion.Entry<Suggest.Suggestion.Entry.Option>(new StringText(text.text()),0, text.bytes().length );
    while(collectionQueue.size() > 0){
        entry.addOption(collectionQueue.pop());
    }
    return entry;
}